Src/MergeDoc.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 //    WinMerge:  an interactive diff/merge utility
   3 //    Copyright (C) 1997-2000  Thingamahoochie Software
   4 //    Author: Dean Grimm
   5 //    SPDX-License-Identifier: GPL-2.0-or-later
   6 /////////////////////////////////////////////////////////////////////////////
   7 /**
   8  * @file  MergeDoc.cpp
   9  *
  10  * @brief Implementation file for CMergeDoc
  11  *
  12  */
  13
  14 #include "StdAfx.h"
  15 #include "MergeDoc.h"
  16 #include <io.h>
  17 #include <Poco/Timestamp.h>
  18 #include "UnicodeString.h"
  19 #include "Merge.h"
  20 #include "MainFrm.h"
  21 #include "DiffTextBuffer.h"
  22 #include "Environment.h"
  23 #include "MovedLines.h"
  24 #include "MergeEditView.h"
  25 #include "MergeEditFrm.h"
  26 #include "DirDoc.h"
  27 #include "files.h"
  28 #include "FileTransform.h"
  29 #include "Plugins.h"
  30 #include "unicoder.h"
  31 #include "UniFile.h"
  32 #include "OptionsDef.h"
  33 #include "DiffFileInfo.h"
  34 #include "SaveClosingDlg.h"
  35 #include "OpenTableDlg.h"
  36 #include "DiffList.h"
  37 #include "paths.h"
  38 #include "OptionsMgr.h"
  39 #include "OptionsDiffOptions.h"
  40 #include "MergeLineFlags.h"
  41 #include "FileOrFolderSelect.h"
  42 #include "LineFiltersList.h"
  43 #include "SubstitutionFiltersList.h"
  44 #include "TempFile.h"
  45 #include "codepage_detect.h"
  46 #include "SelectPluginDlg.h"
  47 #include "EncodingErrorBar.h"
  48 #include "MergeCmdLineInfo.h"
  49 #include "TFile.h"
  50 #include "Constants.h"
  51 #include "Merge7zFormatMergePluginImpl.h"
  52 #include "7zCommon.h"
  53 #include "PatchTool.h"
  54 #include "charsets.h"
  55 #include "markdown.h"
  56 #include "stringdiffs.h"
  57
  58 #ifdef _DEBUG
  59 #define new DEBUG_NEW
  60 #endif
  61
  62 using std::swap;
  63
  64 int CMergeDoc::m_nBuffersTemp = 2;
  65
  66 static void SaveBuffForDiff(CDiffTextBuffer & buf, const String& filepath, int nStartLine = 0, int nLines = -1);
  67
  68 /////////////////////////////////////////////////////////////////////////////
  69 // CMergeDoc
  70
  71 IMPLEMENT_DYNCREATE(CMergeDoc, CDocument)
  72
  73 BEGIN_MESSAGE_MAP(CMergeDoc, CDocument)
  74         //{{AFX_MSG_MAP(CMergeDoc)
  75         // [File] menu
  76         ON_COMMAND(ID_FILE_SAVE, OnFileSave)
  77         ON_UPDATE_COMMAND_UI(ID_FILE_SAVE, OnUpdateFileSave)
  78         ON_COMMAND(ID_FILE_SAVE_LEFT, OnFileSaveLeft)
  79         ON_UPDATE_COMMAND_UI(ID_FILE_SAVE_LEFT, OnUpdateFileSaveLeft)
  80         ON_COMMAND(ID_FILE_SAVE_MIDDLE, OnFileSaveMiddle)
  81         ON_UPDATE_COMMAND_UI(ID_FILE_SAVE_MIDDLE, OnUpdateFileSaveMiddle)
  82         ON_COMMAND(ID_FILE_SAVE_RIGHT, OnFileSaveRight)
  83         ON_UPDATE_COMMAND_UI(ID_FILE_SAVE_RIGHT, OnUpdateFileSaveRight)
  84         ON_COMMAND(ID_FILE_SAVEAS_LEFT, OnFileSaveAsLeft)
  85         ON_COMMAND(ID_FILE_SAVEAS_MIDDLE, OnFileSaveAsMiddle)
  86         ON_UPDATE_COMMAND_UI(ID_FILE_SAVEAS_MIDDLE, OnUpdateFileSaveAsMiddle)
  87         ON_COMMAND(ID_FILE_SAVEAS_RIGHT, OnFileSaveAsRight)
  88         ON_COMMAND(ID_FILE_LEFT_READONLY, OnFileReadOnlyLeft)
  89         ON_UPDATE_COMMAND_UI(ID_FILE_LEFT_READONLY, OnUpdateFileReadOnlyLeft)
  90         ON_COMMAND(ID_FILE_MIDDLE_READONLY, OnFileReadOnlyMiddle)
  91         ON_UPDATE_COMMAND_UI(ID_FILE_MIDDLE_READONLY, OnUpdateFileReadOnlyMiddle)
  92         ON_COMMAND(ID_FILE_RIGHT_READONLY, OnFileReadOnlyRight)
  93         ON_UPDATE_COMMAND_UI(ID_FILE_RIGHT_READONLY, OnUpdateFileReadOnlyRight)
  94         ON_COMMAND(ID_RESCAN, OnFileReload)
  95         ON_COMMAND(ID_FILE_ENCODING, OnFileEncoding)
  96         ON_COMMAND(ID_MERGE_COMPARE_TEXT, OnFileRecompareAsText)
  97         ON_UPDATE_COMMAND_UI(ID_MERGE_COMPARE_TEXT, OnUpdateFileRecompareAsText)
  98         ON_COMMAND(ID_MERGE_COMPARE_TABLE, OnFileRecompareAsTable)
  99         ON_UPDATE_COMMAND_UI(ID_MERGE_COMPARE_TABLE, OnUpdateFileRecompareAsTable)
 100         ON_COMMAND_RANGE(ID_MERGE_COMPARE_HEX, ID_MERGE_COMPARE_IMAGE, OnFileRecompareAs)
 101         ON_COMMAND_RANGE(ID_UNPACKERS_FIRST, ID_UNPACKERS_LAST, OnFileRecompareAs)
 102         // [View] menu
 103         ON_COMMAND_RANGE(ID_VIEW_DIFFCONTEXT_ALL, ID_VIEW_DIFFCONTEXT_INVERT, OnDiffContext)
 104         ON_UPDATE_COMMAND_UI_RANGE(ID_VIEW_DIFFCONTEXT_ALL, ID_VIEW_DIFFCONTEXT_INVERT, OnUpdateDiffContext)
 105         ON_COMMAND(ID_SWAPPANES_SWAP12, (OnViewSwapPanes<0, 1>))
 106         ON_COMMAND(ID_SWAPPANES_SWAP23, (OnViewSwapPanes<1, 2>))
 107         ON_COMMAND(ID_SWAPPANES_SWAP13, (OnViewSwapPanes<0, 2>))
 108         ON_UPDATE_COMMAND_UI_RANGE(ID_SWAPPANES_SWAP23, ID_SWAPPANES_SWAP13, OnUpdateSwapContext)
 109         ON_COMMAND(ID_REFRESH, OnRefresh)
 110         // [Tools] menu
 111         ON_COMMAND(ID_TOOLS_GENERATEREPORT, OnToolsGenerateReport)
 112         ON_COMMAND(ID_TOOLS_GENERATEPATCH, OnToolsGeneratePatch)
 113         // [Plugins] menu
 114         ON_COMMAND(ID_OPEN_WITH_UNPACKER, OnOpenWithUnpacker)
 115         ON_COMMAND(ID_APPLY_PREDIFFER, OnApplyPrediffer)
 116         ON_COMMAND_RANGE(ID_NO_PREDIFFER, ID_NO_PREDIFFER, OnPrediffer)
 117         ON_COMMAND_RANGE(ID_PREDIFFERS_FIRST, ID_PREDIFFERS_LAST, OnPrediffer)
 118         ON_UPDATE_COMMAND_UI(ID_NO_PREDIFFER, OnUpdatePrediffer)
 119         ON_UPDATE_COMMAND_UI_RANGE(ID_PREDIFFERS_FIRST, ID_PREDIFFERS_LAST, OnUpdatePrediffer)
 120         // Encoding Error dialog
 121         ON_BN_CLICKED(IDC_FILEENCODING, OnBnClickedFileEncoding)
 122         ON_BN_CLICKED(IDC_PLUGIN, OnBnClickedPlugin)
 123         ON_BN_CLICKED(IDC_HEXVIEW, OnBnClickedHexView)
 124         ON_COMMAND(IDOK, OnOK)
 125         // Status bar
 126         ON_UPDATE_COMMAND_UI(ID_STATUS_PANE0FILE_RO, OnUpdateStatusRO)
 127         ON_UPDATE_COMMAND_UI(ID_STATUS_PANE1FILE_RO, OnUpdateStatusRO)
 128         ON_UPDATE_COMMAND_UI(ID_STATUS_PANE2FILE_RO, OnUpdateStatusRO)
 129         ON_UPDATE_COMMAND_UI(ID_STATUS_DIFFNUM, OnUpdateStatusNum)
 130         //}}AFX_MSG_MAP
 131 END_MESSAGE_MAP()
 132
 133 /////////////////////////////////////////////////////////////////////////////
 134 // CMergeDoc construction/destruction
 135
 136 /**
 137  * @brief Constructor.
 138  */
 139 CMergeDoc::CMergeDoc()
 140 : m_bEnableRescan(true)
 141 , m_nCurDiff(-1)
 142 , m_CurWordDiff{ -1, static_cast<size_t>(-1), -1 }
 143 , m_pDirDoc(nullptr)
 144 , m_bMixedEol(false)
 145 , m_pEncodingErrorBar(nullptr)
 146 , m_bHasSyncPoints(false)
 147 , m_bAutoMerged(false)
 148 , m_nGroups(0)
 149 , m_pView{nullptr}
 150 , m_bAutomaticRescan(false)
 151 , m_CurrentPredifferID(0)
 152 , m_bChangedSchemeManually(false)
 153 {
 154         DIFFOPTIONS options = {0};
 155
 156         m_nBuffers = m_nBuffersTemp;
 157         m_filePaths.SetSize(m_nBuffers);
 158
 159         for (int nBuffer = 0; nBuffer < m_nBuffers; nBuffer++)
 160         {
 161                 m_ptBuf[nBuffer].reset(new CDiffTextBuffer(this, nBuffer));
 162                 m_pSaveFileInfo[nBuffer].reset(new DiffFileInfo());
 163                 m_pRescanFileInfo[nBuffer].reset(new DiffFileInfo());
 164                 m_nBufferType[nBuffer] = BUFFERTYPE::NORMAL;
 165                 m_bEditAfterRescan[nBuffer] = false;
 166         }
 167
 168         m_bEnableRescan = true;
 169         m_bAutomaticRescan = GetOptionsMgr()->GetBool(OPT_AUTOMATIC_RESCAN);
 170
 171         // COleDateTime m_LastRescan
 172         curUndo = undoTgt.begin();
 173         m_nDiffContext = GetOptionsMgr()->GetInt(OPT_DIFF_CONTEXT);
 174         m_bInvertDiffContext = GetOptionsMgr()->GetBool(OPT_INVERT_DIFF_CONTEXT);
 175
 176         m_diffWrapper.SetDetectMovedBlocks(GetOptionsMgr()->GetBool(OPT_CMP_MOVED_BLOCKS));
 177         Options::DiffOptions::Load(GetOptionsMgr(), options);
 178
 179         m_diffWrapper.SetOptions(&options);
 180         m_diffWrapper.SetPrediffer(nullptr);
 181 }
 182
 183 /**
 184  * @brief Destructor.
 185  *
 186  * Informs associated dirdoc that mergedoc is closing.
 187  */
 188 CMergeDoc::~CMergeDoc()
 189 {
 190         if (m_pDirDoc != nullptr)
 191         {
 192                 m_pDirDoc->MergeDocClosing(this);
 193                 m_pDirDoc = nullptr;
 194         }
 195 }
 196
 197 /**
 198  * @brief Deleted data associated with doc before closing.
 199  */
 200 void CMergeDoc::DeleteContents ()
 201 {
 202         CDocument::DeleteContents ();
 203         for (int nBuffer = 0; nBuffer < m_nBuffers; nBuffer++)
 204         {
 205                 m_ptBuf[nBuffer]->FreeAll ();
 206                 m_tempFiles[nBuffer].Delete();
 207         }
 208 }
 209
 210 /**
 211  * @brief Called when new document is created.
 212  *
 213  * Initialises buffers.
 214  */
 215 BOOL CMergeDoc::OnNewDocument()
 216 {
 217         if (!CDocument::OnNewDocument())
 218                 return false;
 219
 220         SetTitle(_("File Comparison").c_str());
 221
 222         for (int nBuffer = 0; nBuffer < m_nBuffers; nBuffer++)
 223                 m_ptBuf[nBuffer]->InitNew ();
 224         return true;
 225 }
 226
 227 /**
 228  * @brief Return active merge edit view (or left one if neither active)
 229  */
 230 CMergeEditView * CMergeDoc::GetActiveMergeView()
 231 {
 232         CView * pActiveView = GetParentFrame()->GetActiveView();
 233         CMergeEditView * pMergeEditView = dynamic_cast<CMergeEditView *>(pActiveView);
 234         if (pMergeEditView == nullptr)
 235                 pMergeEditView = GetView(0, 0); // default to left view (in case some location or detail view active)
 236         return pMergeEditView;
 237 }
 238
 239 CMergeEditView * CMergeDoc::GetActiveMergeGroupView(int nBuffer)
 240 {
 241         return m_pView[GetActiveMergeView()->m_nThisGroup][nBuffer];
 242 }
 243
 244 void CMergeDoc::SetUnpacker(const PackingInfo * infoNewHandler)
 245 {
 246         if (infoNewHandler != nullptr)
 247         {
 248                 m_infoUnpacker = *infoNewHandler;
 249         }
 250 }
 251
 252 void CMergeDoc::SetPrediffer(const PrediffingInfo * infoPrediffer)
 253 {
 254         m_diffWrapper.SetPrediffer(infoPrediffer);
 255 }
 256
 257 void CMergeDoc::GetPrediffer(PrediffingInfo * infoPrediffer)
 258 {
 259         m_diffWrapper.GetPrediffer(infoPrediffer);
 260 }
 261
 262 const PrediffingInfo* CMergeDoc::GetPrediffer() const
 263 {
 264         static PrediffingInfo infoPrediffer;
 265         m_diffWrapper.GetPrediffer(&infoPrediffer);
 266         return &infoPrediffer;
 267 }
 268
 269 /////////////////////////////////////////////////////////////////////////////
 270 // CMergeDoc serialization
 271
 272 void CMergeDoc::Serialize(CArchive& ar)
 273 {
 274         ASSERT(false); // we do not use CDocument serialization
 275 }
 276
 277 /////////////////////////////////////////////////////////////////////////////
 278 // CMergeDoc commands
 279
 280 /**
 281  * @brief Save an editor text buffer to a file for prediffing (make UCS-2LE if appropriate)
 282  *
 283  * @note
 284  * original file is Ansi :
 285  *   buffer  -> save as Ansi -> Ansi plugins -> diffutils
 286  * original file is Unicode (UCS2-LE, UCS2-BE, UTF-8) :
 287  *   buffer  -> save as UTF-8 -> Unicode plugins -> convert to UTF-8 -> diffutils
 288  * (the plugins are optional, not the conversion)
 289  * @todo Show SaveToFile() errors?
 290  */
 291 static void SaveBuffForDiff(CDiffTextBuffer & buf, const String& filepath, int nStartLine, int nLines)
 292 {
 293         // and we don't repack the file
 294         PackingInfo tempPacker(false);
 295
 296         // write buffer out to temporary file
 297         String sError;
 298         int retVal = buf.SaveToFile(filepath, true, sError, tempPacker,
 299                 CRLFSTYLE::AUTOMATIC, false, nStartLine, nLines);
 300 }
 301
 302 /**
 303  * @brief Save files to temp files & compare again.
 304  *
 305  * @param bBinary [in,out] [in] If true, compare two binary files
 306  * [out] If true binary file was detected.
 307  * @param bIdentical [out] If true files were identical
 308  * @param bForced [in] If true, suppressing is ignored and rescan
 309  * is done always
 310  * @return Tells if rescan was successfully, was suppressed, or
 311  * error happened
 312  * If this code is OK, Rescan has detached the views temporarily
 313  * (positions of cursors have been lost)
 314  * @note Rescan() ALWAYS compares temp files. Actual user files are not
 315  * touched by Rescan().
 316  * @sa CDiffWrapper::RunFileDiff()
 317  */
 318 int CMergeDoc::Rescan(bool &bBinary, IDENTLEVEL &identical,
 319                 bool bForced /* =false */)
 320 {
 321         DIFFOPTIONS diffOptions = {0};
 322         DiffFileInfo fileInfo;
 323         bool diffSuccess = false;
 324         int nResult = RESCAN_OK;
 325         FileChange Changed[3] = {FileChange::NoChange, FileChange::NoChange, FileChange::NoChange};
 326         int nBuffer;
 327
 328         if (!bForced)
 329         {
 330                 if (!m_bEnableRescan)
 331                         return RESCAN_SUPPRESSED;
 332         }
 333
 334         ClearWordDiffCache();
 335
 336         if (GetOptionsMgr()->GetBool(OPT_LINEFILTER_ENABLED))
 337         {
 338                 m_diffWrapper.SetFilterList(theApp.m_pLineFilters->GetAsString());
 339         }
 340         else
 341         {
 342                 m_diffWrapper.SetFilterList(_T(""));
 343         }
 344
 345         if (theApp.m_pSubstitutionFiltersList && theApp.m_pSubstitutionFiltersList->GetEnabled())
 346         {
 347                 m_diffWrapper.SetSubstitutionList(theApp.m_pSubstitutionFiltersList->MakeSubstitutionList());
 348         }
 349         else
 350         {
 351                 m_diffWrapper.SetSubstitutionList(nullptr);
 352         }
 353
 354         if (GetView(0, 0)->m_CurSourceDef->type != 0)
 355                 m_diffWrapper.SetFilterCommentsSourceDef(GetView(0, 0)->m_CurSourceDef);
 356         else
 357                 m_diffWrapper.SetFilterCommentsSourceDef(GetFileExt(m_filePaths[0].c_str(), m_strDesc[0].c_str()));
 358
 359         for (nBuffer = 0; nBuffer < m_nBuffers; nBuffer++)
 360         {
 361                 // Check if files have been modified since last rescan
 362                 // Ignore checking in case of scratchpads (empty filenames)
 363                 if (!m_filePaths[nBuffer].empty())
 364                 {
 365                         Changed[nBuffer] = IsFileChangedOnDisk(m_filePaths[nBuffer].c_str(),
 366                                         fileInfo, false, nBuffer);
 367                 }
 368         }
 369         m_LastRescan = COleDateTime::GetCurrentTime();
 370
 371         LPCTSTR tnames[] = {_T("t0_wmdoc"), _T("t1_wmdoc"), _T("t2_wmdoc")};
 372         for (nBuffer = 0; nBuffer < m_nBuffers; nBuffer++)
 373         {
 374                 if (Changed[nBuffer] == FileChange::Removed)
 375                 {
 376                         String msg = strutils::format_string1(_("The file\n%1\nhas disappeared. Please save a copy of the file to continue."), m_filePaths[nBuffer]);
 377                         ShowMessageBox(msg, MB_ICONWARNING);
 378                         bool bSaveResult = false;
 379                         bool ok = DoSaveAs(m_filePaths[nBuffer].c_str(), bSaveResult, nBuffer);
 380                         if (!ok || !bSaveResult)
 381                         {
 382                                 return RESCAN_FILE_ERR;
 383                         }
 384                 }
 385
 386                 String temp = m_tempFiles[nBuffer].GetPath();
 387                 if (temp.empty())
 388                         temp = m_tempFiles[nBuffer].Create(tnames[nBuffer]);
 389                 if (temp.empty())
 390                         return RESCAN_TEMP_ERR;
 391         }
 392
 393         CheckFileChanged();
 394
 395         String tempPath = env::GetTemporaryPath();
 396
 397         // Set up DiffWrapper
 398         m_diffWrapper.GetOptions(&diffOptions);
 399
 400         // Clear diff list
 401         m_diffList.Clear();
 402         m_nCurDiff = -1;
 403         m_CurWordDiff = { -1, static_cast<size_t>(-1), -1 };
 404         // Clear moved lines lists
 405         if (m_diffWrapper.GetDetectMovedBlocks())
 406         {
 407                 for (nBuffer = 0; nBuffer < m_nBuffers; nBuffer++)
 408                         m_diffWrapper.GetMovedLines(nBuffer)->Clear();
 409         }
 410
 411         // Set paths for diffing and run diff
 412         m_diffWrapper.EnablePlugins(GetOptionsMgr()->GetBool(OPT_PLUGINS_ENABLED));
 413         if (m_nBuffers < 3)
 414                 m_diffWrapper.SetPaths(PathContext(m_tempFiles[0].GetPath(), m_tempFiles[1].GetPath()), true);
 415         else
 416                 m_diffWrapper.SetPaths(PathContext(m_tempFiles[0].GetPath(), m_tempFiles[1].GetPath(), m_tempFiles[2].GetPath()), true);
 417         m_diffWrapper.SetCompareFiles(m_filePaths);
 418
 419         DIFFSTATUS status;
 420
 421         if (!HasSyncPoints())
 422         {
 423                 // Save text buffer to file
 424                 for (nBuffer = 0; nBuffer < m_nBuffers; nBuffer++)
 425                 {
 426                         m_ptBuf[nBuffer]->SetTempPath(tempPath);
 427                         SaveBuffForDiff(*m_ptBuf[nBuffer], m_tempFiles[nBuffer].GetPath());
 428                 }
 429
 430                 m_diffWrapper.SetCreateDiffList(&m_diffList);
 431                 diffSuccess = m_diffWrapper.RunFileDiff();
 432
 433                 // Read diff-status
 434                 m_diffWrapper.GetDiffStatus(&status);
 435                 if (bBinary) // believe caller if we were told these are binaries
 436                         status.bBinaries = true;
 437         }
 438         else
 439         {
 440                 const std::vector<std::vector<int> > syncpoints = GetSyncPointList();
 441                 int nStartLine[3] = {0};
 442                 int nLines[3], nRealLine[3];
 443                 for (size_t i = 0; i <= syncpoints.size(); ++i)
 444                 {
 445                         // Save text buffer to file
 446                         for (nBuffer = 0; nBuffer < m_nBuffers; nBuffer++)
 447                         {
 448                                 nLines[nBuffer] = (i >= syncpoints.size()) ? -1 : syncpoints[i][nBuffer] - nStartLine[nBuffer];
 449                                 m_ptBuf[nBuffer]->SetTempPath(tempPath);
 450                                 SaveBuffForDiff(*m_ptBuf[nBuffer], m_tempFiles[nBuffer].GetPath(),
 451                                         nStartLine[nBuffer], nLines[nBuffer]);
 452                         }
 453                         DiffList templist;
 454                         templist.Clear();
 455                         m_diffWrapper.SetCreateDiffList(&templist);
 456                         diffSuccess = m_diffWrapper.RunFileDiff();
 457                         for (nBuffer = 0; nBuffer < m_nBuffers; nBuffer++)
 458                                 nRealLine[nBuffer] = m_ptBuf[nBuffer]->ComputeRealLine(nStartLine[nBuffer]);
 459
 460                         // Correct the comparison results made by diffutils if the first file separated by the sync point is an empty file.
 461                         if (i == 0 && templist.GetSize() > 0)
 462                                 for (nBuffer = 0; nBuffer < m_nBuffers; nBuffer++)
 463                                         if (nStartLine[nBuffer] == 0)
 464                                         {
 465                                                 bool isEmptyFile = true;
 466                                                 for (int j = 0; j < nLines[nBuffer]; j++)
 467                                                 {
 468                                                         if (!(m_ptBuf[nBuffer]->GetLineFlags(nStartLine[nBuffer] + j) & LF_GHOST))
 469                                                         {
 470                                                                 isEmptyFile = false;
 471                                                                 break;
 472                                                         }
 473                                                 }
 474                                                 if (isEmptyFile)
 475                                                 {
 476                                                         DIFFRANGE di;
 477                                                         templist.GetDiff(0, di);
 478                                                         if (di.begin[nBuffer] == 0 && di.end[nBuffer] == 0)
 479                                                         {
 480                                                                 di.end[nBuffer] = -1;
 481                                                                 templist.SetDiff(0, di);
 482                                                         }
 483                                                 }
 484                                         }
 485
 486                         m_diffList.AppendDiffList(templist, nRealLine);
 487                         for (nBuffer = 0; nBuffer < m_nBuffers; nBuffer++)
 488                                 nStartLine[nBuffer] += nLines[nBuffer];
 489
 490                         // Read diff-status
 491                         DIFFSTATUS status_part;
 492                         m_diffWrapper.GetDiffStatus(&status_part);
 493                         if (bBinary) // believe caller if we were told these are binaries
 494                                 status.bBinaries = true;
 495                         status.MergeStatus(status_part);
 496                 }
 497                 m_diffWrapper.SetCreateDiffList(&m_diffList);
 498         }
 499
 500         // If one file has EOL before EOF and other not...
 501         if (std::count(status.bMissingNL, status.bMissingNL + m_nBuffers, status.bMissingNL[0]) < m_nBuffers)
 502         {
 503                 // ..last DIFFRANGE of file which has EOL must be
 504                 // fixed to contain last line too
 505                 int lineCount[3] = { 0,0,0 };
 506                 for (nBuffer = 0; nBuffer < m_nBuffers; nBuffer++)
 507                         lineCount[nBuffer] = m_ptBuf[nBuffer]->GetLineCount();
 508                 m_diffWrapper.FixLastDiffRange(m_nBuffers, lineCount, status.bMissingNL, diffOptions.bIgnoreBlankLines);
 509         }
 510
 511         // set identical/diff result as recorded by diffutils
 512         identical = status.Identical;
 513
 514         // Determine errors and binary file compares
 515         if (!diffSuccess)
 516                 nResult = RESCAN_FILE_ERR;
 517         else if (status.bBinaries)
 518         {
 519                 bBinary = true;
 520         }
 521         else
 522         {
 523                 // Now update views and buffers for ghost lines
 524
 525                 // Prevent displaying views during this update
 526                 // BTW, this solves the problem of double asserts
 527                 // (during the display of an assert message box, a second assert in one of the
 528                 //  display functions happens, and hides the first assert)
 529                 ForEachView([](auto& pView) { pView->DetachFromBuffer(); });
 530
 531                 // Remove blank lines and clear winmerge flags
 532                 // this operation does not change the modified flag
 533                 for (nBuffer = 0; nBuffer < m_nBuffers; nBuffer++)
 534                         m_ptBuf[nBuffer]->prepareForRescan();
 535
 536                 // Divide diff blocks to match lines.
 537                 if (GetOptionsMgr()->GetBool(OPT_CMP_MATCH_SIMILAR_LINES) && m_nBuffers < 3)
 538                         AdjustDiffBlocks();
 539
 540                 // Analyse diff-list (updating real line-numbers)
 541                 // this operation does not change the modified flag
 542                 PrimeTextBuffers();
 543
 544                 // Hide identical lines if diff-context is not 'All'
 545                 HideLines();
 546
 547                 // Apply flags to lines that are trivial
 548                 PrediffingInfo infoPrediffer;
 549                 GetPrediffer(&infoPrediffer);
 550                 if (!infoPrediffer.GetPluginPipeline().empty())
 551                         FlagTrivialLines();
 552
 553                 // Apply flags to lines that moved, to differentiate from appeared/disappeared lines
 554                 if (m_diffWrapper.GetDetectMovedBlocks())
 555                         FlagMovedLines();
 556
 557                 // After PrimeTextBuffers() we know amount of real diffs
 558                 // (m_nDiffs) and trivial diffs (m_nTrivialDiffs)
 559
 560                 // Identical files are also updated
 561                 if (!m_diffList.HasSignificantDiffs())
 562                         identical = IDENTLEVEL::ALL;
 563
 564                 ForEachView([](auto& pView) {
 565                         // just apply some options to the views
 566                         pView->PrimeListWithFile();
 567                         // Now buffers data are valid
 568                         pView->ReAttachToBuffer();
 569                 });
 570                 for (nBuffer = 0; nBuffer < m_nBuffers; nBuffer++)
 571                 {
 572                         m_bEditAfterRescan[nBuffer] = false;
 573                 }
 574         }
 575
 576         if (!GetOptionsMgr()->GetBool(OPT_CMP_IGNORE_CODEPAGE) &&
 577                 identical == IDENTLEVEL::ALL &&
 578                 std::any_of(m_ptBuf, m_ptBuf + m_nBuffers,
 579                         [&](std::unique_ptr<CDiffTextBuffer>& buf) { return buf->getEncoding() != m_ptBuf[0]->getEncoding(); }))
 580                 identical = IDENTLEVEL::NONE;
 581
 582         GetParentFrame()->SetLastCompareResult(identical != IDENTLEVEL::ALL ? 1 : 0);
 583
 584         return nResult;
 585 }
 586
 587 void CMergeDoc::CheckFileChanged(void)
 588 {
 589         int nBuffer;
 590         DiffFileInfo fileInfo;
 591         FileChange FileChange[3];
 592
 593         for (nBuffer = 0; nBuffer < m_nBuffers; nBuffer++)
 594         {
 595                 FileChange[nBuffer] = IsFileChangedOnDisk(m_filePaths[nBuffer].c_str(), fileInfo,
 596                         false, nBuffer);
 597
 598                 m_pRescanFileInfo[nBuffer]->Update((LPCTSTR)m_filePaths[nBuffer].c_str());
 599         }
 600
 601         bool bDoReload = false;
 602         for (nBuffer = 0; nBuffer < m_nBuffers; nBuffer++)
 603         {
 604                 if (FileChange[nBuffer] == FileChange::Changed)
 605                 {
 606                         String msg = strutils::format_string1(_("Another application has updated file\n%1\nsince WinMerge scanned it last time.\n\nDo you want to reload the file?"), m_filePaths[nBuffer]);
 607                         if (ShowMessageBox(msg, MB_YESNO | MB_ICONWARNING | MB_DONT_ASK_AGAIN, IDS_FILECHANGED_RESCAN) == IDYES)
 608                                 bDoReload = true;
 609                         break;
 610                 }
 611         }
 612         if (bDoReload)
 613         {
 614                 for (nBuffer = 0; nBuffer < m_nBuffers; nBuffer++)
 615                 {
 616                         if (FileChange[nBuffer] == FileChange::Changed)
 617                         {
 618                                 CPoint pt = GetView(0, nBuffer)->GetCursorPos();
 619                                 ChangeFile(nBuffer, m_filePaths[nBuffer], pt.y);
 620                         }
 621                 }
 622         }
 623 }
 624
 625 /** @brief Apply flags to lines that are trivial */
 626 void CMergeDoc::FlagTrivialLines(void)
 627 {
 628         for (int i = 0; i < m_ptBuf[0]->GetLineCount(); ++i)
 629         {
 630                 if ((m_ptBuf[0]->GetLineFlags(i) & LF_NONTRIVIAL_DIFF) == 0)
 631                 {
 632                         String str[3];
 633                         for (int file = 0; file < m_nBuffers; ++file)
 634                         {
 635                                 const TCHAR *p = m_ptBuf[file]->GetLineChars(i);
 636                                 str[file] = p ? p : _T("");
 637                         }
 638
 639                         if (std::count(str + 1, str + m_nBuffers, str[0]) != m_nBuffers - 1)
 640                         {
 641                                 DIFFOPTIONS diffOptions = {0};
 642                                 m_diffWrapper.GetOptions(&diffOptions);
 643
 644                                 // Make the call to stringdiffs, which does all the hard & tedious computations
 645                                 std::vector<strdiff::wdiff> worddiffs = strdiff::ComputeWordDiffs(m_nBuffers, str,
 646                                         !diffOptions.bIgnoreCase,
 647                                         !diffOptions.bIgnoreEol,
 648                                         diffOptions.nIgnoreWhitespace,
 649                                         GetBreakType(), // whitespace only or include punctuation
 650                                         GetByteColoringOption());
 651                                 if (!worddiffs.empty())
 652                                 {
 653                                         for (int file = 0; file < m_nBuffers; ++file)
 654                                                 m_ptBuf[file]->SetLineFlag(i, LF_TRIVIAL, true, false, false);
 655                                 }
 656                         }
 657                 }
 658         }
 659 }
 660
 661 /** @brief Adjust all different lines that were detected as actually matching moved lines */
 662 void CMergeDoc::FlagMovedLines(void)
 663 {
 664         int i;
 665         MovedLines *pMovedLines;
 666
 667         pMovedLines = m_diffWrapper.GetMovedLines(0);
 668         for (i = 0; i < m_ptBuf[0]->GetLineCount(); ++i)
 669         {
 670                 int j = pMovedLines->LineInBlock(i, MovedLines::SIDE::RIGHT);
 671                 if (j != -1)
 672                 {
 673                         TRACE(_T("%d->%d\n"), i, j);
 674                         ASSERT(j>=0);
 675                         // We only flag lines that are already marked as being different
 676                         int apparent = m_ptBuf[0]->ComputeApparentLine(i);
 677                         if (m_ptBuf[0]->FlagIsSet(apparent, LF_DIFF))
 678                         {
 679                                 m_ptBuf[0]->SetLineFlag(apparent, LF_MOVED, true, false, false);
 680                                 if (m_ptBuf[1]->FlagIsSet(apparent, LF_GHOST))
 681                                 {
 682                                         int apparentJ = m_ptBuf[1]->ComputeApparentLine(j);
 683                                         if (m_ptBuf[0]->FlagIsSet(apparentJ, LF_GHOST))
 684                                                 m_ptBuf[1]->SetLineFlag(apparent, LF_MOVED, true, false, false);
 685                                 }
 686                         }
 687                 }
 688         }
 689
 690         pMovedLines = m_diffWrapper.GetMovedLines(1);
 691         for (i=0; i<m_ptBuf[1]->GetLineCount(); ++i)
 692         {
 693                 int j = pMovedLines->LineInBlock(i, MovedLines::SIDE::LEFT);
 694                 if (j != -1)
 695                 {
 696                         TRACE(_T("%d->%d\n"), i, j);
 697                         ASSERT(j>=0);
 698                         // We only flag lines that are already marked as being different
 699                         int apparent = m_ptBuf[1]->ComputeApparentLine(i);
 700                         if (m_ptBuf[1]->FlagIsSet(apparent, LF_DIFF))
 701                         {
 702                                 m_ptBuf[1]->SetLineFlag(apparent, LF_MOVED, true, false, false);
 703                                 if (m_ptBuf[0]->FlagIsSet(apparent, LF_GHOST))
 704                                 {
 705                                         int apparentJ = m_ptBuf[0]->ComputeApparentLine(j);
 706                                         if (m_ptBuf[1]->FlagIsSet(apparentJ, LF_GHOST))
 707                                                 m_ptBuf[0]->SetLineFlag(apparent, LF_MOVED, true, false, false);
 708                                 }
 709                         }
 710                 }
 711         }
 712
 713         if (m_nBuffers < 3)
 714                 return;
 715
 716         pMovedLines = m_diffWrapper.GetMovedLines(1);
 717         for (i=0; i<m_ptBuf[1]->GetLineCount(); ++i)
 718         {
 719                 int j = pMovedLines->LineInBlock(i, MovedLines::SIDE::RIGHT);
 720                 if (j != -1)
 721                 {
 722                         TRACE(_T("%d->%d\n"), i, j);
 723                         ASSERT(j>=0);
 724                         // We only flag lines that are already marked as being different
 725                         int apparent = m_ptBuf[1]->ComputeApparentLine(i);
 726                         if (m_ptBuf[1]->FlagIsSet(apparent, LF_DIFF))
 727                         {
 728                                 m_ptBuf[1]->SetLineFlag(apparent, LF_MOVED, true, false, false);
 729                                 if (m_ptBuf[2]->FlagIsSet(apparent, LF_GHOST))
 730                                 {
 731                                         int apparentJ = m_ptBuf[2]->ComputeApparentLine(j);
 732                                         if (m_ptBuf[1]->FlagIsSet(apparentJ, LF_GHOST))
 733                                                 m_ptBuf[2]->SetLineFlag(apparent, LF_MOVED, true, false, false);
 734                                 }
 735                         }
 736                 }
 737         }
 738
 739         pMovedLines = m_diffWrapper.GetMovedLines(2);
 740         for (i=0; i<m_ptBuf[2]->GetLineCount(); ++i)
 741         {
 742                 int j = pMovedLines->LineInBlock(i, MovedLines::SIDE::LEFT);
 743                 if (j != -1)
 744                 {
 745                         TRACE(_T("%d->%d\n"), i, j);
 746                         ASSERT(j>=0);
 747                         // We only flag lines that are already marked as being different
 748                         int apparent = m_ptBuf[2]->ComputeApparentLine(i);
 749                         if (m_ptBuf[2]->FlagIsSet(apparent, LF_DIFF))
 750                         {
 751                                 m_ptBuf[2]->SetLineFlag(apparent, LF_MOVED, true, false, false);
 752                                 if (m_ptBuf[1]->FlagIsSet(apparent, LF_GHOST))
 753                                 {
 754                                         int apparentJ = m_ptBuf[1]->ComputeApparentLine(j);
 755                                         if (m_ptBuf[2]->FlagIsSet(apparentJ, LF_GHOST))
 756                                                 m_ptBuf[1]->SetLineFlag(apparent, LF_MOVED, true, false, false);
 757                                 }
 758                         }
 759                 }
 760         }
 761
 762         // todo: Need to record actual moved information
 763 }
 764
 765 int CMergeDoc::ShowMessageBox(const String& sText, unsigned nType, unsigned nIDHelp)
 766 {
 767         if (m_pView[0][0] && m_pView[0][0]->IsTextBufferInitialized() && !GetParentFrame()->IsActivated())
 768         {
 769                 GetParentFrame()->InitialUpdateFrame(this, true);
 770                 GetParentFrame()->SendMessageToDescendants(WM_IDLEUPDATECMDUI, static_cast<WPARAM>(true), 0, true, true);
 771         }
 772         return AfxMessageBox(sText.c_str(), nType, nIDHelp);
 773 }
 774
 775 /**
 776  * @brief Prints (error) message by rescan status.
 777  *
 778  * @param nRescanResult [in] Resultcocode from rescan().
 779  * @param bIdentical [in] Were files identical?.
 780  * @sa CMergeDoc::Rescan()
 781  */
 782 void CMergeDoc::ShowRescanError(int nRescanResult, IDENTLEVEL identical)
 783 {
 784         // Rescan was suppressed, there is no sensible status
 785         if (nRescanResult == RESCAN_SUPPRESSED)
 786                 return;
 787
 788         String s;
 789
 790         if (nRescanResult == RESCAN_FILE_ERR)
 791         {
 792                 s = _("An error occurred while comparing the files.");
 793                 LogErrorString(s);
 794                 ShowMessageBox(s, MB_ICONSTOP);
 795                 return;
 796         }
 797
 798         if (nRescanResult == RESCAN_TEMP_ERR)
 799         {
 800                 s = _("Temporary files could not be created. Check your temporary path settings.");
 801                 LogErrorString(s);
 802                 ShowMessageBox(s, MB_ICONSTOP);
 803                 return;
 804         }
 805
 806         // Files are not binaries, but they are identical
 807         if (identical != IDENTLEVEL::NONE)
 808         {
 809                 CMergeFrameCommon::ShowIdenticalMessage(m_filePaths, identical == IDENTLEVEL::ALL,
 810                         [this](LPCTSTR msg, UINT flags, UINT id) -> int { return ShowMessageBox(msg, flags, id); });
 811         }
 812 }
 813
 814 bool CMergeDoc::Undo()
 815 {
 816         return false;
 817 }
 818
 819 /**
 820  * @brief An instance of RescanSuppress prevents rescan during its lifetime
 821  * (or until its Clear method is called, which ends its effect).
 822  */
 823 class RescanSuppress
 824 {
 825 public:
 826         explicit RescanSuppress(CMergeDoc & doc) : m_doc(doc)
 827         {
 828                 m_bSuppress = true;
 829                 m_bPrev = doc.m_bEnableRescan;
 830                 m_doc.m_bEnableRescan = false;
 831         }
 832         void Clear()
 833         {
 834                 if (m_bSuppress)
 835                 {
 836                         m_bSuppress = false;
 837                         m_doc.m_bEnableRescan = m_bPrev;
 838                 }
 839         }
 840         ~RescanSuppress()
 841         {
 842                 Clear();
 843         }
 844 private:
 845         CMergeDoc & m_doc;
 846         bool m_bPrev;
 847         bool m_bSuppress;
 848 };
 849
 850 /**
 851  * @brief Copy all diffs from one side to side.
 852  * @param [in] srcPane Source side from which diff is copied
 853  * @param [in] dstPane Destination side
 854  */
 855 void CMergeDoc::CopyAllList(int srcPane, int dstPane)
 856 {
 857         CopyMultipleList(srcPane, dstPane, 0, m_diffList.GetSize() - 1);
 858 }
 859
 860 /**
 861  * @brief Copy range of diffs from one side to side.
 862  * This function copies given range of differences from side to another.
 863  * Ignored differences are skipped, and not copied.
 864  * @param [in] srcPane Source side from which diff is copied
 865  * @param [in] dstPane Destination side
 866  * @param [in] firstDiff First diff copied (0-based index)
 867  * @param [in] lastDiff Last diff copied (0-based index)
 868  */
 869 void CMergeDoc::CopyMultipleList(int srcPane, int dstPane, int firstDiff, int lastDiff, int firstWordDiff, int lastWordDiff)
 870 {
 871 #ifdef _DEBUG
 872         if (firstDiff > lastDiff)
 873                 _RPTF0(_CRT_ERROR, "Invalid diff range (firstDiff > lastDiff)!");
 874         if (firstDiff < 0)
 875                 _RPTF0(_CRT_ERROR, "Invalid diff range (firstDiff < 0)!");
 876         if (lastDiff > m_diffList.GetSize() - 1)
 877                 _RPTF0(_CRT_ERROR, "Invalid diff range (lastDiff < diffcount)!");
 878 #endif
 879
 880         lastDiff = min(m_diffList.GetSize() - 1, lastDiff);
 881         firstDiff = max(0, firstDiff);
 882         if (firstDiff > lastDiff)
 883                 return;
 884
 885         RescanSuppress suppressRescan(*this);
 886
 887         // Note we don't care about m_nDiffs count to become zero,
 888         // because we don't rescan() so it does not change
 889
 890         SetCurrentDiff(lastDiff);
 891
 892         bool bGroupWithPrevious = false;
 893         if (firstWordDiff <= 0 && lastWordDiff == -1)
 894         {
 895                 if (!ListCopy(srcPane, dstPane, -1, bGroupWithPrevious, true))
 896                         return; // sync failure
 897         }
 898         else
 899         {
 900                 if (!WordListCopy(srcPane, dstPane, lastDiff,
 901                         (firstDiff == lastDiff) ? firstWordDiff : 0, lastWordDiff, nullptr, bGroupWithPrevious, true))
 902                         return; // sync failure
 903         }
 904
 905         SetEditedAfterRescan(dstPane);
 906
 907         int nGroup = GetActiveMergeView()->m_nThisGroup;
 908         CMergeEditView *pViewSrc = m_pView[nGroup][srcPane];
 909         CMergeEditView *pViewDst = m_pView[nGroup][dstPane];
 910         CPoint currentPosSrc = pViewSrc->GetCursorPos();
 911         currentPosSrc.x = 0;
 912         CPoint currentPosDst = pViewDst->GetCursorPos();
 913         currentPosDst.x = 0;
 914
 915         CPoint pt(0, 0);
 916         pViewDst->SetCursorPos(pt);
 917         pViewDst->SetNewSelection(pt, pt, false);
 918         pViewDst->SetNewAnchor(pt);
 919
 920         // copy from bottom up is more efficient
 921         for (int i = lastDiff - 1; i >= firstDiff; --i)
 922         {
 923                 if (m_diffList.IsDiffSignificant(i))
 924                 {
 925                         SetCurrentDiff(i);
 926                         const DIFFRANGE *pdi = m_diffList.DiffRangeAt(i);
 927                         if (currentPosDst.y > pdi->dend)
 928                         {
 929                                 if (pdi->blank[dstPane] >= 0)
 930                                         currentPosDst.y -= pdi->dend - pdi->blank[dstPane] + 1;
 931                                 else if (pdi->blank[srcPane] >= 0)
 932                                         currentPosDst.y -= pdi->dend - pdi->blank[srcPane] + 1;
 933                         }
 934                         // Group merge with previous (merge undo data to one action)
 935                         bGroupWithPrevious = true;
 936                         if (i > firstDiff || firstWordDiff <= 0)
 937                         {
 938                                 if (!ListCopy(srcPane, dstPane, -1, bGroupWithPrevious, false))
 939                                         break; // sync failure
 940                         }
 941                         else
 942                         {
 943                                 if (!WordListCopy(srcPane, dstPane, firstDiff, firstWordDiff, -1, nullptr, bGroupWithPrevious, false))
 944                                         break; // sync failure
 945                         }
 946                 }
 947         }
 948
 949         ForEachView(dstPane, [currentPosDst](auto& pView) {
 950                 pView->SetCursorPos(currentPosDst);
 951                 pView->SetNewSelection(currentPosDst, currentPosDst, false);
 952                 pView->SetNewAnchor(currentPosDst);
 953         });
 954
 955         suppressRescan.Clear(); // done suppress Rescan
 956         FlushAndRescan();
 957 }
 958
 959 void CMergeDoc::CopyMultiplePartialList(int srcPane, int dstPane, int firstDiff, int lastDiff,
 960         int firstLineDiff, int lastLineDiff)
 961 {
 962         lastDiff = min(m_diffList.GetSize() - 1, lastDiff);
 963         firstDiff = max(0, firstDiff);
 964         if (firstDiff > lastDiff)
 965                 return;
 966
 967         RescanSuppress suppressRescan(*this);
 968
 969         bool bGroupWithPrevious = false;
 970         if (firstLineDiff <= 0 && lastLineDiff == -1)
 971         {
 972                 if (!ListCopy(srcPane, dstPane, -1, bGroupWithPrevious, true))
 973                         return; // sync failure
 974         }
 975         else
 976         {
 977                 if (!PartialListCopy(srcPane, dstPane, lastDiff,
 978                         (firstDiff == lastDiff) ? firstLineDiff : 0, lastLineDiff, bGroupWithPrevious, true))
 979                         return; // sync failure
 980         }
 981
 982
 983         SetEditedAfterRescan(dstPane);
 984
 985         int nGroup = GetActiveMergeView()->m_nThisGroup;
 986         CMergeEditView *pViewSrc = m_pView[nGroup][srcPane];
 987         CMergeEditView *pViewDst = m_pView[nGroup][dstPane];
 988         CPoint currentPosSrc = pViewSrc->GetCursorPos();
 989         currentPosSrc.x = 0;
 990         CPoint currentPosDst = pViewDst->GetCursorPos();
 991         currentPosDst.x = 0;
 992
 993         CPoint pt(0, 0);
 994         pViewDst->SetCursorPos(pt);
 995         pViewDst->SetNewSelection(pt, pt, false);
 996         pViewDst->SetNewAnchor(pt);
 997
 998         // copy from bottom up is more efficient
 999         for (int i = lastDiff - 1; i >= firstDiff; --i)
1000         {
1001                 if (m_diffList.IsDiffSignificant(i))
1002                 {
1003                         SetCurrentDiff(i);
1004                         const DIFFRANGE *pdi = m_diffList.DiffRangeAt(i);
1005                         if (currentPosDst.y > pdi->dend)
1006                         {
1007                                 if (pdi->blank[dstPane] >= 0)
1008                                         currentPosDst.y -= pdi->dend - pdi->blank[dstPane] + 1;
1009                                 else if (pdi->blank[srcPane] >= 0)
1010                                         currentPosDst.y -= pdi->dend - pdi->blank[srcPane] + 1;
1011                         }
1012                         // Group merge with previous (merge undo data to one action)
1013                         bGroupWithPrevious = true;
1014                         if (i > firstDiff || firstLineDiff <= 0)
1015                         {
1016                                 if (!ListCopy(srcPane, dstPane, -1, bGroupWithPrevious, false))
1017                                         break; // sync failure
1018                         }
1019                         else
1020                         {
1021                                 if (!PartialListCopy(srcPane, dstPane, firstDiff, firstLineDiff, -1, bGroupWithPrevious, false))
1022                                         break; // sync failure
1023                         }
1024                 }
1025         }
1026
1027         ForEachView(dstPane, [currentPosDst](auto& pView) {
1028                 pView->SetCursorPos(currentPosDst);
1029                 pView->SetNewSelection(currentPosDst, currentPosDst, false);
1030                 pView->SetNewAnchor(currentPosDst);
1031         });
1032
1033         suppressRescan.Clear(); // done suppress Rescan
1034         FlushAndRescan();
1035 }
1036
1037 enum MergeResult { NoMergeNeeded, Merged, Conflict };
1038
1039 template<class Type>
1040 static std::pair<MergeResult, Type> DoMergeValue(Type left, Type middle, Type right, int dstPane)
1041 {
1042         bool equal_all = middle == left && middle == right && left == right;
1043         if (equal_all)
1044                 return std::pair<MergeResult, Type>(NoMergeNeeded, left);
1045         bool conflict = middle != left && middle != right && left != right;
1046         if (conflict)
1047                 return std::pair<MergeResult, Type>(Conflict, left);
1048         switch (dstPane)
1049         {
1050         case 0:
1051                 if (left == right)
1052                         return std::pair<MergeResult, Type>(Merged, middle);
1053                 break;
1054         case 1:
1055                 if (left == middle)
1056                         return std::pair<MergeResult, Type>(Merged, right);
1057                 else
1058                         return std::pair<MergeResult, Type>(Merged, left);
1059                 break;
1060         case 2:
1061                 if (left == right)
1062                         return std::pair<MergeResult, Type>(Merged, middle);
1063                 break;
1064         }
1065         return std::pair<MergeResult, Type>(NoMergeNeeded, left);
1066 }
1067
1068 /**
1069  * @brief Do auto-merge.
1070  * @param [in] dstPane Destination side
1071  */
1072 void CMergeDoc::DoAutoMerge(int dstPane)
1073 {
1074         const int lastDiff = m_diffList.GetSize() - 1;
1075         const int firstDiff = 0;
1076         bool bGroupWithPrevious = false;
1077         int autoMergedCount = 0;
1078         int unresolvedConflictCount = 0;
1079
1080         std::pair<MergeResult, FileTextEncoding> mergedEncoding =
1081                 DoMergeValue(m_ptBuf[0]->getEncoding(), m_ptBuf[1]->getEncoding(), m_ptBuf[2]->getEncoding(), dstPane);
1082         if (mergedEncoding.first == Merged)
1083         {
1084                 ShowMessageBox(_("The change of codepage has been merged."), MB_ICONINFORMATION);
1085                 m_ptBuf[dstPane]->setEncoding(mergedEncoding.second);
1086         }
1087         else if (mergedEncoding.first == Conflict)
1088                 ShowMessageBox(_("The changes of codepage are conflicting."), MB_ICONINFORMATION);
1089
1090         std::pair<MergeResult, CRLFSTYLE> mergedEOLStyle =
1091                 DoMergeValue(m_ptBuf[0]->GetCRLFMode(), m_ptBuf[1]->GetCRLFMode(), m_ptBuf[2]->GetCRLFMode(), dstPane);
1092         if (mergedEOLStyle.first == Merged)
1093         {
1094                 ShowMessageBox(_("The change of EOL has been merged."), MB_ICONINFORMATION);
1095                 m_ptBuf[dstPane]->SetCRLFMode(mergedEOLStyle.second);
1096         }
1097         else if (mergedEOLStyle.first == Conflict)
1098                 ShowMessageBox(_("The changes of EOL are conflicting."), MB_ICONINFORMATION);
1099
1100         RescanSuppress suppressRescan(*this);
1101
1102         // Note we don't care about m_nDiffs count to become zero,
1103         // because we don't rescan() so it does not change
1104
1105         SetCurrentDiff(lastDiff);
1106
1107         SetEditedAfterRescan(dstPane);
1108
1109         int nGroup = GetActiveMergeView()->m_nThisGroup;
1110         CMergeEditView *pViewDst = m_pView[nGroup][dstPane];
1111         CPoint currentPosDst = pViewDst->GetCursorPos();
1112         currentPosDst.x = 0;
1113
1114         CPoint pt(0, 0);
1115         pViewDst->SetCursorPos(pt);
1116         pViewDst->SetNewSelection(pt, pt, false);
1117         pViewDst->SetNewAnchor(pt);
1118
1119         // copy from bottom up is more efficient
1120         for (int i = lastDiff; i >= firstDiff; --i)
1121         {
1122                 const DIFFRANGE *pdi = m_diffList.DiffRangeAt(i);
1123                 const int srcPane = m_diffList.GetMergeableSrcIndex(i, dstPane);
1124                 if (srcPane != -1)
1125                 {
1126                         SetCurrentDiff(i);
1127                         if (currentPosDst.y > pdi->dend)
1128                         {
1129                                 if (pdi->blank[dstPane] >= 0)
1130                                         currentPosDst.y -= pdi->dend - pdi->blank[dstPane] + 1;
1131                                 else if (pdi->blank[srcPane] >= 0)
1132                                         currentPosDst.y -= pdi->dend - pdi->blank[srcPane] + 1;
1133                         }
1134                         // Group merge with previous (merge undo data to one action)
1135                         if (!ListCopy(srcPane, dstPane, -1, bGroupWithPrevious, false))
1136                                 break; // sync failure
1137                         if (!bGroupWithPrevious)
1138                                 bGroupWithPrevious = true;
1139                         ++autoMergedCount;
1140                 }
1141                 if (pdi->op == OP_DIFF)
1142                         ++unresolvedConflictCount;
1143         }
1144
1145         ForEachView(dstPane, [currentPosDst](auto& pView) {
1146                 pView->SetCursorPos(currentPosDst);
1147                 pView->SetNewSelection(currentPosDst, currentPosDst, false);
1148                 pView->SetNewAnchor(currentPosDst);
1149         });
1150
1151         suppressRescan.Clear(); // done suppress Rescan
1152         FlushAndRescan();
1153         UpdateHeaderPath(dstPane);
1154
1155         if (autoMergedCount > 0)
1156                 m_bAutoMerged = true;
1157
1158         // move to first conflict
1159         const int nDiff = m_diffList.FirstSignificant3wayDiff(THREEWAYDIFFTYPE_CONFLICT);
1160         if (nDiff != -1)
1161                 pViewDst->SelectDiff(nDiff, true, false);
1162
1163         ShowMessageBox(
1164                 strutils::format_string2(
1165                         _("The number of automatically merged changes: %1\nThe number of unresolved conflicts: %2"),
1166                         strutils::format(_T("%d"), autoMergedCount),
1167                         strutils::format(_T("%d"), unresolvedConflictCount)),
1168                 MB_ICONINFORMATION);
1169 }
1170
1171 /**
1172  * @brief Sanity check difference.
1173  *
1174  * Checks that lines in difference are inside difference in both files.
1175  * If file is edited, lines added or removed diff lines get out of sync and
1176  * merging fails miserably.
1177  *
1178  * @param [in] dr Difference to check.
1179  * @return true if difference lines match, false otherwise.
1180  */
1181 bool CMergeDoc::SanityCheckDiff(DIFFRANGE dr) const
1182 {
1183         const int cd_dbegin = dr.dbegin;
1184         const int cd_dend = dr.dend;
1185
1186         for (int nBuffer = 0; nBuffer < m_nBuffers; nBuffer++)
1187         {
1188                 // Must ensure line number is in range before getting line flags
1189                 if (cd_dend >= m_ptBuf[nBuffer]->GetLineCount())
1190                         return false;
1191
1192                 // Optimization - check last line first so we don't need to
1193                 // check whole diff for obvious cases
1194                 DWORD dwFlags = m_ptBuf[nBuffer]->GetLineFlags(cd_dend);
1195                 if (!(dwFlags & LF_WINMERGE_FLAGS))
1196                         return false;
1197         }
1198
1199         for (int line = cd_dbegin; line < cd_dend; line++)
1200         {
1201                 for (int nBuffer = 0; nBuffer < m_nBuffers; nBuffer++)
1202                 {
1203                         DWORD dwFlags = m_ptBuf[nBuffer]->GetLineFlags(cd_dend);
1204                         if (!(dwFlags & LF_WINMERGE_FLAGS))
1205                                 return false;
1206                 }
1207         }
1208         return true;
1209 }
1210
1211 /**
1212  * @brief Copy selected (=current) difference from from side to side.
1213  * @param [in] srcPane Source side from which diff is copied
1214  * @param [in] dstPane Destination side
1215  * @param [in] nDiff Diff to copy, if -1 function determines it.
1216  * @param [in] bGroupWithPrevious Adds diff to same undo group with
1217  * @return true if ok, false if sync failure & need to abort copy
1218  * previous action (allows one undo for copy all)
1219  */
1220 bool CMergeDoc::ListCopy(int srcPane, int dstPane, int nDiff /* = -1*/,
1221                 bool bGroupWithPrevious /*= false*/, bool bUpdateView /*= true*/)
1222 {
1223         int nGroup = GetActiveMergeView()->m_nThisGroup;
1224         CMergeEditView *pViewSrc = m_pView[nGroup][srcPane];
1225         CMergeEditView *pViewDst = m_pView[nGroup][dstPane];
1226         CCrystalTextView *pSource = bUpdateView ? pViewDst : nullptr;
1227
1228         // suppress Rescan during this method
1229         // (Not only do we not want to rescan a lot of times, but
1230         // it will wreck the line status array to rescan as we merge)
1231         RescanSuppress suppressRescan(*this);
1232
1233         // If diff-number not given, determine it from active view
1234         if (nDiff == -1)
1235         {
1236                 nDiff = GetCurrentDiff();
1237
1238                 // No current diff, but maybe cursor is in diff?
1239                 if (nDiff == -1 && (pViewSrc->IsCursorInDiff() ||
1240                         pViewDst->IsCursorInDiff()))
1241                 {
1242                         // Find out diff under cursor
1243                         CPoint ptCursor = GetActiveMergeView()->GetCursorPos();
1244                         nDiff = m_diffList.LineToDiff(ptCursor.y);
1245                 }
1246         }
1247
1248         if (nDiff != -1)
1249         {
1250                 DIFFRANGE cd;
1251                 VERIFY(m_diffList.GetDiff(nDiff, cd));
1252                 CDiffTextBuffer& sbuf = *m_ptBuf[srcPane];
1253                 CDiffTextBuffer& dbuf = *m_ptBuf[dstPane];
1254                 bool bSrcWasMod = sbuf.IsModified();
1255                 const int cd_dbegin = cd.dbegin;
1256                 const int cd_dend = cd.dend;
1257                 const int cd_blank = cd.blank[srcPane];
1258                 bool bInSync = SanityCheckDiff(cd);
1259
1260                 if (!bInSync)
1261                 {
1262                         LangMessageBox(IDS_VIEWS_OUTOFSYNC, MB_ICONSTOP);
1263                         return false; // abort copying
1264                 }
1265
1266                 // If we remove whole diff from current view, we must fix cursor
1267                 // position first. Normally we would move to end of previous line,
1268                 // but we want to move to begin of that line for usability.
1269                 if (bUpdateView)
1270                 {
1271                         CPoint currentPos = pViewDst->GetCursorPos();
1272                         currentPos.x = 0;
1273                         if (currentPos.y > cd_dend)
1274                         {
1275                                 if (cd.blank[dstPane] >= 0)
1276                                         currentPos.y -= cd_dend - cd.blank[dstPane] + 1;
1277                                 else if (cd.blank[srcPane] >= 0)
1278                                         currentPos.y -= cd_dend - cd.blank[srcPane] + 1;
1279                         }
1280                         ForEachView(dstPane, [currentPos](auto& pView) { pView->SetCursorPos(currentPos); });
1281                 }
1282
1283                 // if the current diff contains missing lines, remove them from both sides
1284                 int limit = cd_dend;
1285
1286                 // curView is the view which is changed, so the opposite of the source view
1287                 dbuf.BeginUndoGroup(bGroupWithPrevious);
1288                 if (cd_blank>=0)
1289                 {
1290                         // text was missing, so delete rest of lines on both sides
1291                         // delete only on destination side since rescan will clear the other side
1292                         if (cd_dend + 1 < dbuf.GetLineCount())
1293                         {
1294                                 dbuf.DeleteText(pSource, cd_blank, 0, cd_dend+1, 0, CE_ACTION_MERGE);
1295                         }
1296                         else
1297                         {
1298                                 // To removing EOL chars of last line, deletes from the end of the line (cd_blank - 1).
1299                                 ASSERT(cd_blank > 0);
1300                                 dbuf.DeleteText(pSource, cd_blank-1, dbuf.GetLineLength(cd_blank-1), cd_dend, dbuf.GetLineLength(cd_dend), CE_ACTION_MERGE);
1301                         }
1302
1303                         limit=cd_blank-1;
1304                         dbuf.FlushUndoGroup(pSource);
1305                         dbuf.BeginUndoGroup(true);
1306                 }
1307
1308
1309                 // copy the selected text over
1310                 if (cd_dbegin <= limit)
1311                 {
1312                         // text exists on left side, so just replace
1313                         dbuf.ReplaceFullLines(dbuf, sbuf, pSource, cd_dbegin, limit, CE_ACTION_MERGE);
1314                         dbuf.FlushUndoGroup(pSource);
1315                         dbuf.BeginUndoGroup(true);
1316                 }
1317                 dbuf.FlushUndoGroup(pSource);
1318
1319                 // remove the diff
1320                 SetCurrentDiff(-1);
1321
1322                 // reset the mod status of the source view because we do make some
1323                 // changes, but none that concern the source text
1324                 sbuf.SetModified(bSrcWasMod);
1325         }
1326
1327         suppressRescan.Clear(); // done suppress Rescan
1328         FlushAndRescan();
1329         return true;
1330 }
1331
1332 bool CMergeDoc::PartialListCopy(int srcPane, int dstPane, int nDiff, int firstLine, int lastLine /*= -1*/,
1333         bool bGroupWithPrevious /*= false*/, bool bUpdateView /*= true*/)
1334 {
1335         int nGroup = GetActiveMergeView()->m_nThisGroup;
1336         CMergeEditView *pViewSrc = m_pView[nGroup][srcPane];
1337         CMergeEditView *pViewDst = m_pView[nGroup][dstPane];
1338         CCrystalTextView *pSource = bUpdateView ? pViewDst : nullptr;
1339
1340         // suppress Rescan during this method
1341         // (Not only do we not want to rescan a lot of times, but
1342         // it will wreck the line status array to rescan as we merge)
1343         RescanSuppress suppressRescan(*this);
1344
1345         DIFFRANGE cd;
1346         VERIFY(m_diffList.GetDiff(nDiff, cd));
1347         CDiffTextBuffer& sbuf = *m_ptBuf[srcPane];
1348         CDiffTextBuffer& dbuf = *m_ptBuf[dstPane];
1349         bool bSrcWasMod = sbuf.IsModified();
1350         const int cd_dbegin = (firstLine > cd.dbegin) ? firstLine : cd.dbegin;
1351         const int cd_dend = cd.dend;
1352         const int cd_blank = cd.blank[srcPane];
1353         bool bInSync = SanityCheckDiff(cd);
1354
1355         if (!bInSync)
1356         {
1357                 LangMessageBox(IDS_VIEWS_OUTOFSYNC, MB_ICONSTOP);
1358                 return false; // abort copying
1359         }
1360
1361         // If we remove whole diff from current view, we must fix cursor
1362         // position first. Normally we would move to end of previous line,
1363         // but we want to move to begin of that line for usability.
1364         if (bUpdateView)
1365         {
1366                 CPoint currentPos = pViewDst->GetCursorPos();
1367                 currentPos.x = 0;
1368                 if (currentPos.y > cd_dend)
1369                 {
1370                         if (cd.blank[dstPane] >= 0)
1371                                 currentPos.y -= cd_dend - cd.blank[dstPane] + 1;
1372                         else if (cd.blank[srcPane] >= 0)
1373                                 currentPos.y -= cd_dend - cd.blank[srcPane] + 1;
1374                 }
1375                 ForEachView(dstPane, [currentPos](auto& pView) { pView->SetCursorPos(currentPos); });
1376         }
1377
1378         // if the current diff contains missing lines, remove them from both sides
1379         int limit = ((lastLine < 0) || (lastLine > cd_dend)) ? cd_dend : lastLine;
1380
1381         // curView is the view which is changed, so the opposite of the source view
1382         dbuf.BeginUndoGroup(bGroupWithPrevious);
1383         if ((cd_blank >= 0) && (cd_dbegin >= cd_blank))
1384         {
1385                 // text was missing, so delete rest of lines on both sides
1386                 // delete only on destination side since rescan will clear the other side
1387                 if (limit+1 < dbuf.GetLineCount())
1388                 {
1389                         dbuf.DeleteText(pSource, cd_dbegin, 0, limit+1, 0, CE_ACTION_MERGE);
1390                 }
1391                 else
1392                 {
1393                         // To removing EOL chars of last line, deletes from the end of the line (cd_blank - 1).
1394                         ASSERT(cd_dbegin > 0);
1395                         dbuf.DeleteText(pSource, cd_dbegin-1, dbuf.GetLineLength(cd_dbegin-1), limit, dbuf.GetLineLength(limit), CE_ACTION_MERGE);
1396                 }
1397
1398                 limit = cd_dbegin-1;
1399                 dbuf.FlushUndoGroup(pSource);
1400                 dbuf.BeginUndoGroup(true);
1401         }
1402
1403         // copy the selected text over
1404         if (cd_dbegin <= limit)
1405         {
1406                 // text exists on left side, so just replace
1407                 dbuf.ReplaceFullLines(dbuf, sbuf, pSource, cd_dbegin, limit, CE_ACTION_MERGE);
1408                 dbuf.FlushUndoGroup(pSource);
1409                 dbuf.BeginUndoGroup(true);
1410         }
1411         dbuf.FlushUndoGroup(pSource);
1412
1413         // remove the diff
1414         SetCurrentDiff(-1);
1415
1416         // reset the mod status of the source view because we do make some
1417         // changes, but none that concern the source text
1418         sbuf.SetModified(bSrcWasMod);
1419
1420         suppressRescan.Clear(); // done suppress Rescan
1421         FlushAndRescan();
1422         return true;
1423 }
1424
1425 bool CMergeDoc::WordListCopy(int srcPane, int dstPane, int nDiff, int firstWordDiff, int lastWordDiff,
1426                 const std::vector<int> *pWordDiffIndice, bool bGroupWithPrevious /*= false*/, bool bUpdateView /*= true*/)
1427 {
1428         int nGroup = GetActiveMergeView()->m_nThisGroup;
1429         CMergeEditView *pViewSrc = m_pView[nGroup][srcPane];
1430         CMergeEditView *pViewDst = m_pView[nGroup][dstPane];
1431         CCrystalTextView *pSource = bUpdateView ? pViewDst : nullptr;
1432
1433         // suppress Rescan during this method
1434         // (Not only do we not want to rescan a lot of times, but
1435         // it will wreck the line status array to rescan as we merge)
1436         RescanSuppress suppressRescan(*this);
1437
1438         DIFFRANGE cd;
1439         VERIFY(m_diffList.GetDiff(nDiff, cd));
1440         CDiffTextBuffer& sbuf = *m_ptBuf[srcPane];
1441         CDiffTextBuffer& dbuf = *m_ptBuf[dstPane];
1442         bool bSrcWasMod = sbuf.IsModified();
1443         const int cd_dbegin = cd.dbegin;
1444         const int cd_dend = cd.dend;
1445         const int cd_blank = cd.blank[srcPane];
1446         bool bInSync = SanityCheckDiff(cd);
1447
1448         if (!bInSync)
1449         {
1450                 LangMessageBox(IDS_VIEWS_OUTOFSYNC, MB_ICONSTOP);
1451                 return false; // abort copying
1452         }
1453
1454         std::vector<WordDiff> worddiffs = GetWordDiffArrayInDiffBlock(nDiff);
1455
1456         if (worddiffs.empty())
1457                 return false;
1458
1459         if (cd.end[srcPane] < cd.begin[srcPane])
1460                 return ListCopy(srcPane, dstPane, nDiff, bGroupWithPrevious, bUpdateView);
1461
1462         if (firstWordDiff == -1)
1463                 firstWordDiff = 0;
1464         if (lastWordDiff == -1)
1465                 lastWordDiff = static_cast<int>(worddiffs.size() - 1);
1466
1467         // If we remove whole diff from current view, we must fix cursor
1468         // position first. Normally we would move to end of previous line,
1469         // but we want to move to begin of that line for usability.
1470         if (bUpdateView)
1471         {
1472                 CPoint currentPos = pViewDst->GetCursorPos();
1473                 currentPos.x = 0;
1474                 if (currentPos.y > cd_dend)
1475                 {
1476                         if (cd.blank[dstPane] >= 0)
1477                                 currentPos.y -= cd_dend - cd.blank[dstPane] + 1;
1478                         else if (cd.blank[srcPane] >= 0)
1479                                 currentPos.y -= cd_dend - cd.blank[srcPane] + 1;
1480                 }
1481                 ForEachView(dstPane, [currentPos](auto& pView) { pView->SetCursorPos(currentPos); });
1482         }
1483
1484         // if the current diff contains missing lines, remove them from both sides
1485         int limit = cd_dend;
1486
1487         // curView is the view which is changed, so the opposite of the source view
1488         dbuf.BeginUndoGroup(bGroupWithPrevious);
1489
1490         CString srcText, dstText;
1491         CPoint ptDstStart, ptDstEnd;
1492         CPoint ptSrcStart, ptSrcEnd;
1493
1494         ptDstStart.x = worddiffs[firstWordDiff].begin[dstPane];
1495         ptDstStart.y = worddiffs[firstWordDiff].beginline[dstPane];
1496         ptDstEnd.x = worddiffs[lastWordDiff].end[dstPane];
1497         ptDstEnd.y = worddiffs[lastWordDiff].endline[dstPane];
1498         ptSrcStart.x = worddiffs[firstWordDiff].begin[srcPane];
1499         ptSrcStart.y = worddiffs[firstWordDiff].beginline[srcPane];
1500         ptSrcEnd.x = worddiffs[lastWordDiff].end[srcPane];
1501         ptSrcEnd.y = worddiffs[lastWordDiff].endline[srcPane];
1502
1503         std::vector<int> nDstOffsets(ptDstEnd.y - ptDstStart.y + 2);
1504         std::vector<int> nSrcOffsets(ptSrcEnd.y - ptSrcStart.y + 2);
1505
1506         dbuf.GetTextWithoutEmptys(ptDstStart.y, ptDstStart.x, ptDstEnd.y, ptDstEnd.x, dstText);
1507         sbuf.GetTextWithoutEmptys(ptSrcStart.y, ptSrcStart.x, ptSrcEnd.y, ptSrcEnd.x, srcText);
1508
1509         nDstOffsets[0] = 0;
1510         for (int nLine = ptDstStart.y; nLine <= ptDstEnd.y; nLine++)
1511                 nDstOffsets[nLine-ptDstStart.y+1] = nDstOffsets[nLine-ptDstStart.y] + dbuf.GetFullLineLength(nLine);
1512         nSrcOffsets[0] = 0;
1513         for (int nLine = ptSrcStart.y; nLine <= ptSrcEnd.y; nLine++)
1514                 nSrcOffsets[nLine-ptSrcStart.y+1] = nSrcOffsets[nLine-ptSrcStart.y] + sbuf.GetFullLineLength(nLine);
1515
1516         for (int i = lastWordDiff; i != firstWordDiff-1; --i)
1517         {
1518                 if (pWordDiffIndice && std::find(pWordDiffIndice->begin(), pWordDiffIndice->end(), i) == pWordDiffIndice->end())
1519                         continue;
1520                 int srcBegin = nSrcOffsets[worddiffs[i].beginline[srcPane] - ptSrcStart.y] + worddiffs[i].begin[srcPane];
1521                 int srcEnd   = nSrcOffsets[worddiffs[i].endline[srcPane] - ptSrcStart.y] + worddiffs[i].end[srcPane];
1522                 int dstBegin = nDstOffsets[worddiffs[i].beginline[dstPane] - ptDstStart.y] + worddiffs[i].begin[dstPane];
1523                 int dstEnd   = nDstOffsets[worddiffs[i].endline[dstPane] - ptDstStart.y] + worddiffs[i].end[dstPane];
1524                 dstText = dstText.Mid(0, dstBegin - ptDstStart.x)
1525                         + srcText.Mid(srcBegin - ptSrcStart.x, srcEnd - srcBegin)
1526                         + dstText.Mid(dstEnd - ptDstStart.x);
1527         }
1528
1529         dbuf.DeleteText(pSource, ptDstStart.y, ptDstStart.x, ptDstEnd.y, ptDstEnd.x, CE_ACTION_MERGE);
1530
1531         int endl,endc;
1532         dbuf.InsertText(pSource, ptDstStart.y, ptDstStart.x, dstText, dstText.GetLength(), endl, endc, CE_ACTION_MERGE);
1533
1534         dbuf.FlushUndoGroup(pSource);
1535
1536         // reset the mod status of the source view because we do make some
1537         // changes, but none that concern the source text
1538         sbuf.SetModified(bSrcWasMod);
1539
1540         suppressRescan.Clear(); // done suppress Rescan
1541         FlushAndRescan();
1542
1543         return true;
1544 }
1545
1546 /**
1547  * @brief Save file with new filename.
1548  *
1549  * This function is called by CMergeDoc::DoSave() or CMergeDoc::DoSAveAs()
1550  * to save file with new filename. CMergeDoc::DoSave() calls if saving with
1551  * normal filename fails, to let user choose another filename/location.
1552  * Also, if file is unnamed file (e.g. scratchpad) then it must be saved
1553  * using this function.
1554  * @param [in, out] strPath
1555  * - [in] : Initial path shown to user
1556  * - [out] : Path to new filename if saving succeeds
1557  * @param [in, out] nSaveResult
1558  * - [in] : Statuscode telling why we ended up here. Maybe the result of
1559  * previous save.
1560  * - [out] : Statuscode of this saving try
1561  * @param [in, out] sError Error string from lower level saving code
1562  * @param [in] nBuffer Buffer we are saving
1563  * @return false as long as the user is not satisfied. Calling function
1564  * should not continue until true is returned.
1565  * @sa CMergeDoc::DoSave()
1566  * @sa CMergeDoc::DoSaveAs()
1567  * @sa CMergeDoc::CDiffTextBuffer::SaveToFile()
1568  */
1569 bool CMergeDoc::TrySaveAs(String &strPath, int &nSaveResult, String & sError,
1570         int nBuffer, PackingInfo& infoTempUnpacker)
1571 {
1572         String s;
1573         String str;
1574         String strSavePath; // New path for next saving try
1575         String title;
1576         bool result = true;
1577         int answer = IDOK; // Set default we use for scratchpads
1578
1579         // We shouldn't get here if saving is succeed before
1580         ASSERT(nSaveResult != SAVE_DONE);
1581
1582         // Select message based on reason function called
1583         if (nSaveResult == SAVE_PACK_FAILED)
1584         {
1585                 str = CMergeApp::GetPackingErrorMessage(nBuffer, m_nBuffers, strPath, infoTempUnpacker);
1586                 // replace the unpacker with a "do nothing" unpacker
1587                 infoTempUnpacker.Initialize(false);
1588         }
1589         else
1590         {
1591                 str = strutils::format_string2(_("Saving file failed.\n%1\n%2\nDo you want to:\n\t- use a different filename (Press OK)\n\t- abort the current operation (Press Cancel)?"), strPath, sError);
1592         }
1593
1594         // SAVE_NO_FILENAME is temporarily used for scratchpad.
1595         // So don't ask about saving in that case.
1596         if (nSaveResult != SAVE_NO_FILENAME)
1597                 answer = ShowMessageBox(str, MB_OKCANCEL | MB_ICONWARNING);
1598
1599         switch (answer)
1600         {
1601         case IDOK:
1602                 if (nBuffer == 0)
1603                         title = _("Save Left File As");
1604                 else if (nBuffer == m_nBuffers - 1)
1605                         title = _("Save Right File As");
1606                 else
1607                         title = _("Save Middle File As");
1608
1609                 if (SelectFile(GetActiveMergeView()->GetSafeHwnd(), s, false, strPath.c_str(), title))
1610                 {
1611                         CDiffTextBuffer *pBuffer = m_ptBuf[nBuffer].get();
1612                         strSavePath = s;
1613                         nSaveResult = pBuffer->SaveToFile(strSavePath, false, sError,
1614                                 infoTempUnpacker);
1615
1616                         if (nSaveResult == SAVE_DONE)
1617                         {
1618                                 // We are saving scratchpad (unnamed file)
1619                                 if (strPath.empty())
1620                                 {
1621                                         m_nBufferType[nBuffer] = BUFFERTYPE::UNNAMED_SAVED;
1622                                         m_strDesc[nBuffer].erase();
1623                                 }
1624
1625                                 strPath = strSavePath;
1626                                 UpdateHeaderPath(nBuffer);
1627                         }
1628                         else
1629                                 result = false;
1630                 }
1631                 else
1632                         nSaveResult = SAVE_CANCELLED;
1633                 break;
1634
1635         case IDCANCEL:
1636                 nSaveResult = SAVE_CANCELLED;
1637                 break;
1638         }
1639         return result;
1640 }
1641
1642 /**
1643  * @brief Save file creating backups etc.
1644  *
1645  * Safe top-level file saving function. Checks validity of given path.
1646  * Creates backup file if wanted to. And if saving to given path fails,
1647  * allows user to select new location/name for file.
1648  * @param [in] szPath Path where to save including filename. Can be
1649  * empty/`nullptr` if new file is created (scratchpad) without filename.
1650  * @param [out] bSaveSuccess Will contain information about save success with
1651  * the original name (to determine if file statuses should be changed)
1652  * @param [in] nBuffer Index (0-based) of buffer to save
1653  * @return Tells if caller can continue (no errors happened)
1654  * @note Return value does not tell if SAVING succeeded. Caller must
1655  * Check value of bSaveSuccess parameter after calling this function!
1656  * @note If CMainFrame::m_strSaveAsPath is non-empty, file is saved
1657  * to directory it points to. If m_strSaveAsPath contains filename,
1658  * that filename is used.
1659  * @sa CMergeDoc::TrySaveAs()
1660  * @sa CMainFrame::CheckSavePath()
1661  * @sa CMergeDoc::CDiffTextBuffer::SaveToFile()
1662  */
1663 bool CMergeDoc::DoSave(LPCTSTR szPath, bool &bSaveSuccess, int nBuffer)
1664 {
1665         DiffFileInfo fileInfo;
1666         String strSavePath(szPath);
1667         FileChange fileChanged;
1668         bool bApplyToAll = false;
1669         int nRetVal = -1;
1670
1671         fileChanged = IsFileChangedOnDisk(szPath, fileInfo, true, nBuffer);
1672         if (fileChanged == FileChange::Changed)
1673         {
1674                 String msg = strutils::format_string1(_("Another application has updated file\n%1\nsince WinMerge loaded it.\n\nOverwrite changed file?"), szPath);
1675                 if (ShowMessageBox(msg, MB_ICONWARNING | MB_YESNO) == IDNO)
1676                 {
1677                         bSaveSuccess = true;
1678                         return true;
1679                 }
1680         }
1681
1682         // use a temp packer
1683         // first copy the m_infoUnpacker
1684         // if an error arises during packing, change and take a "do nothing" packer
1685         PackingInfo infoTempUnpacker = m_infoUnpacker;
1686
1687         bSaveSuccess = false;
1688
1689         // Check third arg possibly given from command-line
1690         if (!theApp.m_strSaveAsPath.empty())
1691         {
1692                 if (paths::DoesPathExist(theApp.m_strSaveAsPath) == paths::IS_EXISTING_DIR)
1693                 {
1694                         // third arg was a directory, so get append the filename
1695                         String sname;
1696                         paths::SplitFilename(szPath, 0, &sname, 0);
1697                         strSavePath = theApp.m_strSaveAsPath;
1698                         strSavePath = paths::ConcatPath(strSavePath, sname);
1699                 }
1700                 else
1701                         strSavePath = theApp.m_strSaveAsPath;
1702         }
1703
1704         nRetVal = CMergeApp::HandleReadonlySave(strSavePath, false, bApplyToAll);
1705         if (nRetVal == IDCANCEL)
1706                 return false;
1707
1708         if (!CMergeApp::CreateBackup(false, strSavePath))
1709                 return false;
1710
1711         // false as long as the user is not satisfied
1712         // true if saving succeeds, even with another filename, or if the user cancels
1713         bool result = false;
1714         // the error code from the latest save operation,
1715         // or SAVE_DONE when the save succeeds
1716         // TODO: Shall we return this code in addition to bSaveSuccess ?
1717         int nSaveErrorCode = SAVE_DONE;
1718         CDiffTextBuffer *pBuffer = m_ptBuf[nBuffer].get();
1719
1720         // Assume empty filename means Scratchpad (unnamed file)
1721         // Todo: This is not needed? - buffer type check should be enough
1722         if (strSavePath.empty())
1723                 nSaveErrorCode = SAVE_NO_FILENAME;
1724
1725         // Handle unnamed buffers
1726         if (m_nBufferType[nBuffer] == BUFFERTYPE::UNNAMED)
1727                 nSaveErrorCode = SAVE_NO_FILENAME;
1728
1729         String sError;
1730         if (nSaveErrorCode == SAVE_DONE)
1731                 // We have a filename, just try to save
1732                 nSaveErrorCode = pBuffer->SaveToFile(strSavePath, false, sError, infoTempUnpacker);
1733
1734         if (nSaveErrorCode != SAVE_DONE)
1735         {
1736                 // Saving failed, user may save to another location if wants to
1737                 do
1738                         result = TrySaveAs(strSavePath, nSaveErrorCode, sError, nBuffer, infoTempUnpacker);
1739                 while (!result);
1740         }
1741
1742         // Saving succeeded with given/selected filename
1743         if (nSaveErrorCode == SAVE_DONE)
1744         {
1745                 // Preserve file times if user wants to
1746                 if (GetOptionsMgr()->GetBool(OPT_PRESERVE_FILETIMES))
1747                 {
1748                         fileInfo.SetFile(strSavePath);
1749                         try
1750                         {
1751                                 TFile file(strSavePath);
1752                                 file.setLastModified(fileInfo.mtime);
1753                         }
1754                         catch (...)
1755                         {
1756                         }
1757                 }
1758
1759                 m_ptBuf[nBuffer]->SetModified(false);
1760                 m_pSaveFileInfo[nBuffer]->Update(strSavePath.c_str());
1761                 m_filePaths[nBuffer] = strSavePath;
1762                 m_pRescanFileInfo[nBuffer]->Update(m_filePaths[nBuffer].c_str());
1763                 UpdateHeaderPath(nBuffer);
1764                 bSaveSuccess = true;
1765                 result = true;
1766         }
1767         else if (nSaveErrorCode == SAVE_CANCELLED)
1768         {
1769                 // User cancelled current operation, lets do what user wanted to do
1770                 result = false;
1771         }
1772         return result;
1773 }
1774
1775 /**
1776  * @brief Save file with different filename.
1777  *
1778  * Safe top-level file saving function. Asks user to select filename
1779  * and path. Does not create backups.
1780  * @param [in] szPath Path where to save including filename. Can be
1781  * empty/`nullptr` if new file is created (scratchpad) without filename.
1782  * @param [out] bSaveSuccess Will contain information about save success with
1783  * the original name (to determine if file statuses should be changed)
1784  * @param [in] nBuffer Index (0-based) of buffer to save
1785  * @return Tells if caller can continue (no errors happened)
1786  * @note Return value does not tell if SAVING succeeded. Caller must
1787  * Check value of bSaveSuccess parameter after calling this function!
1788  * @sa CMergeDoc::TrySaveAs()
1789  * @sa CMainFrame::CheckSavePath()
1790  * @sa CMergeDoc::CDiffTextBuffer::SaveToFile()
1791  */
1792 bool CMergeDoc::DoSaveAs(LPCTSTR szPath, bool &bSaveSuccess, int nBuffer)
1793 {
1794         String strSavePath(szPath);
1795
1796         // use a temp packer
1797         // first copy the m_infoUnpacker
1798         // if an error arises during packing, change and take a "do nothing" packer
1799         PackingInfo infoTempUnpacker = m_infoUnpacker;
1800
1801         bSaveSuccess = false;
1802         // false as long as the user is not satisfied
1803         // true if saving succeeds, even with another filename, or if the user cancels
1804         bool result = false;
1805         // the error code from the latest save operation,
1806         // or SAVE_DONE when the save succeeds
1807         // TODO: Shall we return this code in addition to bSaveSuccess ?
1808         int nSaveErrorCode = SAVE_DONE;
1809
1810         // Use SAVE_NO_FILENAME to prevent asking about error
1811         nSaveErrorCode = SAVE_NO_FILENAME;
1812
1813         // Loop until user succeeds saving or cancels
1814         String sError;
1815         do
1816                 result = TrySaveAs(strSavePath, nSaveErrorCode, sError, nBuffer, infoTempUnpacker);
1817         while (!result);
1818
1819         // Saving succeeded with given/selected filename
1820         if (nSaveErrorCode == SAVE_DONE)
1821         {
1822                 m_pSaveFileInfo[nBuffer]->Update(strSavePath);
1823                 m_filePaths[nBuffer] = strSavePath;
1824                 m_pRescanFileInfo[nBuffer]->Update(m_filePaths[nBuffer]);
1825                 UpdateHeaderPath(nBuffer);
1826                 bSaveSuccess = true;
1827                 result = true;
1828         }
1829         return result;
1830 }
1831
1832 /**
1833  * @brief Get left->right info for a moved line (apparent line number)
1834  */
1835 int CMergeDoc::RightLineInMovedBlock(int nBuffer, int apparentLeftLine)
1836 {
1837         if (!(m_ptBuf[nBuffer]->GetLineFlags(apparentLeftLine) & LF_MOVED))
1838                 return -1;
1839
1840         int realLeftLine = m_ptBuf[nBuffer]->ComputeRealLine(apparentLeftLine);
1841         int realRightLine = -1;
1842         if (m_diffWrapper.GetDetectMovedBlocks())
1843         {
1844                 realRightLine = m_diffWrapper.GetMovedLines(nBuffer)->LineInBlock(realLeftLine,
1845                                 MovedLines::SIDE::RIGHT);
1846         }
1847         if (realRightLine != -1)
1848                 return m_ptBuf[nBuffer + 1]->ComputeApparentLine(realRightLine);
1849         else
1850                 return -1;
1851 }
1852
1853 /**
1854  * @brief Get right->left info for a moved line (apparent line number)
1855  */
1856 int CMergeDoc::LeftLineInMovedBlock(int nBuffer, int apparentRightLine)
1857 {
1858         if (!(m_ptBuf[nBuffer]->GetLineFlags(apparentRightLine) & LF_MOVED))
1859                 return -1;
1860
1861         int realRightLine = m_ptBuf[nBuffer]->ComputeRealLine(apparentRightLine);
1862         int realLeftLine = -1;
1863         if (m_diffWrapper.GetDetectMovedBlocks())
1864         {
1865                 realLeftLine = m_diffWrapper.GetMovedLines(nBuffer)->LineInBlock(realRightLine,
1866                                 MovedLines::SIDE::LEFT);
1867         }
1868         if (realLeftLine != -1)
1869                 return m_ptBuf[nBuffer - 1]->ComputeApparentLine(realLeftLine);
1870         else
1871                 return -1;
1872 }
1873
1874 /**
1875  * @brief Save modified documents.
1876  * This function asks if user wants to save modified documents. We also
1877  * allow user to cancel the closing.
1878  *
1879  * There is a special trick avoiding showing two save-dialogs, as MFC framework
1880  * sometimes calls this function twice. We use static counter for these calls
1881  * and if we already have saving in progress (counter == 1) we skip the new
1882  * saving dialog.
1883  *
1884  * @return true if docs are closed, false if closing is cancelled.
1885  */
1886 BOOL CMergeDoc::SaveModified()
1887 {
1888         static int counter;
1889         ++counter;
1890         if (counter > 1)
1891                 return false;
1892
1893         if (PromptAndSaveIfNeeded(true))
1894         {
1895                 counter = 0;
1896                 return true;
1897         }
1898         else
1899         {
1900                 counter = 0;
1901                 return false;
1902         }
1903 }
1904
1905 /**
1906  * @brief Sets the current difference.
1907  * @param [in] nDiff Difference to set as current difference.
1908  */
1909 void CMergeDoc::SetCurrentDiff(int nDiff)
1910 {
1911         if (nDiff >= 0 && nDiff <= m_diffList.LastSignificantDiff())
1912                 m_nCurDiff = nDiff;
1913         else
1914                 m_nCurDiff = -1;
1915 }
1916
1917 /**
1918  * @brief Take care of rescanning document.
1919  *
1920  * Update view and restore cursor and scroll position after
1921  * rescanning document.
1922  * @param [in] bForced If true rescan cannot be suppressed
1923  */
1924 void CMergeDoc::FlushAndRescan(bool bForced /* =false */)
1925 {
1926         // Ignore suppressing when forced rescan
1927         if (!bForced)
1928                 if (!m_bEnableRescan) return;
1929
1930         CWaitCursor waitstatus;
1931
1932         CMergeEditView *pActiveView = GetActiveMergeView();
1933
1934         // store cursors and hide caret
1935         ForEachView([](auto& pView) { pView->PushCursors(); });
1936         pActiveView->HideCursor();
1937
1938         bool bBinary = false;
1939         IDENTLEVEL identical = IDENTLEVEL::NONE;
1940         int nRescanResult = Rescan(bBinary, identical, bForced);
1941
1942         // restore cursors and caret
1943         ForEachView([](auto& pView) { pView->PopCursors(); });
1944         pActiveView->ShowCursor();
1945
1946         ForEachView(pActiveView->m_nThisPane, [](auto& pView) {
1947                 // because of ghostlines, m_nTopLine may differ just after Rescan
1948                 // scroll both views to the same top line
1949                 pView->UpdateSiblingScrollPos(false);
1950         });
1951         // make sure we see the cursor from the curent view
1952         pActiveView->EnsureVisible(pActiveView->GetCursorPos());
1953
1954         // Refresh display
1955         UpdateAllViews(nullptr);
1956
1957         // Show possible error after updating screen
1958         if (nRescanResult != RESCAN_SUPPRESSED)
1959                 ShowRescanError(nRescanResult, identical);
1960         m_LastRescan = COleDateTime::GetCurrentTime();
1961 }
1962
1963 /**
1964  * @brief Saves both files
1965  */
1966 void CMergeDoc::OnFileSave()
1967 {
1968         // We will need to know if either of the originals actually changed
1969         // so we know whether to update the diff status
1970         bool bChangedOriginal = false;
1971
1972         for (int nBuffer = 0; nBuffer < m_nBuffers; nBuffer++)
1973         {
1974                 if (m_ptBuf[nBuffer]->IsModified() && !m_ptBuf[nBuffer]->GetReadOnly())
1975                 {
1976                         // (why we don't use return value of DoSave)
1977                         // DoSave will return true if it wrote to something successfully
1978                         // but we have to know if it overwrote the original file
1979                         bool bSaveOriginal = false;
1980                         DoSave(m_filePaths[nBuffer].c_str(), bSaveOriginal, nBuffer );
1981                         if (bSaveOriginal)
1982                                 bChangedOriginal = true;
1983                 }
1984         }
1985
1986         // If either of the actual source files being compared was changed
1987         // we need to update status in the dir view
1988         if (bChangedOriginal)
1989         {
1990                 // If DirDoc contains diffs
1991                 if (m_pDirDoc != nullptr && m_pDirDoc->HasDiffs())
1992                 {
1993                         for (int nBuffer = 0; nBuffer < m_nBuffers; nBuffer++)
1994                         {
1995                                 if (m_bEditAfterRescan[nBuffer])
1996                                 {
1997                                         FlushAndRescan(false);
1998                                         break;
1999                                 }
2000                         }
2001
2002                         bool bIdentical = !m_diffList.HasSignificantDiffs(); // True if status should be set to identical
2003                         m_pDirDoc->UpdateChangedItem(m_filePaths, m_diffList.GetSignificantDiffs(),
2004                                         m_nTrivialDiffs, bIdentical);
2005                 }
2006         }
2007 }
2008
2009 void CMergeDoc::DoFileSave(int nBuffer)
2010 {
2011         bool bSaveSuccess = false;
2012         bool bModified = false;
2013
2014         if (m_ptBuf[nBuffer]->IsModified() && !m_ptBuf[nBuffer]->GetReadOnly())
2015         {
2016                 bModified = true;
2017                 DoSave(m_filePaths[nBuffer].c_str(), bSaveSuccess, nBuffer );
2018         }
2019
2020         // If file were modified and saving succeeded,
2021         // update status on dir view
2022         if (bModified && bSaveSuccess)
2023         {
2024                 // If DirDoc contains compare results
2025                 if (m_pDirDoc != nullptr && m_pDirDoc->HasDiffs())
2026                 {
2027                         for (int nBuffer1 = 0; nBuffer1 < m_nBuffers; nBuffer1++)
2028                         {
2029                                 if (m_bEditAfterRescan[nBuffer1])
2030                                 {
2031                                         FlushAndRescan(false);
2032                                         break;
2033                                 }
2034                         }
2035
2036                         bool bIdentical = !m_diffList.HasSignificantDiffs(); // True if status should be set to identical
2037                         m_pDirDoc->UpdateChangedItem(m_filePaths, m_diffList.GetSignificantDiffs(),
2038                                         m_nTrivialDiffs, bIdentical);
2039                 }
2040         }
2041 }
2042
2043 /**
2044  * @brief Saves left-side file
2045  */
2046 void CMergeDoc::OnFileSaveLeft()
2047 {
2048         DoFileSave(0);
2049 }
2050
2051 /**
2052  * @brief Saves middle-side file
2053  */
2054 void CMergeDoc::OnFileSaveMiddle()
2055 {
2056         DoFileSave(1);
2057 }
2058
2059 /**
2060  * @brief Saves right-side file
2061  */
2062 void CMergeDoc::OnFileSaveRight()
2063 {
2064         DoFileSave(m_nBuffers - 1);
2065 }
2066
2067 /**
2068  * @brief Called when "Save" item is updated
2069  */
2070 void CMergeDoc::OnUpdateFileSave(CCmdUI* pCmdUI)
2071 {
2072         bool bModified = false;
2073         for (int nPane = 0; nPane < m_nBuffers; nPane++)
2074         {
2075                 if (m_ptBuf[nPane]->IsModified())
2076                         bModified = true;
2077         }
2078         pCmdUI->Enable(bModified);
2079 }
2080
2081 /**
2082  * @brief Called when "Save left (as...)" item is updated
2083  */
2084 void CMergeDoc::OnUpdateFileSaveLeft(CCmdUI* pCmdUI)
2085 {
2086         pCmdUI->Enable(m_ptBuf[0]->IsModified());
2087 }
2088
2089 /**
2090  * @brief Called when "Save middle (as...)" item is updated
2091  */
2092 void CMergeDoc::OnUpdateFileSaveMiddle(CCmdUI* pCmdUI)
2093 {
2094         pCmdUI->Enable(m_nBuffers == 3 && m_ptBuf[1]->IsModified());
2095 }
2096
2097 /**
2098  * @brief Called when "Save right (as...)" item is updated
2099  */
2100 void CMergeDoc::OnUpdateFileSaveRight(CCmdUI* pCmdUI)
2101 {
2102         pCmdUI->Enable(m_ptBuf[m_nBuffers - 1]->IsModified());
2103 }
2104
2105 /**
2106  * @brief Saves left-side file with name asked
2107  */
2108 void CMergeDoc::OnFileSaveAsLeft()
2109 {
2110         bool bSaveResult = false;
2111         DoSaveAs(m_filePaths.GetLeft().c_str(), bSaveResult, 0);
2112 }
2113
2114 /**
2115  * @brief Called when "Save middle (as...)" item is updated
2116  */
2117 void CMergeDoc::OnUpdateFileSaveAsMiddle(CCmdUI* pCmdUI)
2118 {
2119         pCmdUI->Enable(m_nBuffers == 3);
2120 }
2121
2122 /**
2123  * @brief Saves right-side file with name asked
2124  */
2125 void CMergeDoc::OnFileSaveAsMiddle()
2126 {
2127         bool bSaveResult = false;
2128         DoSaveAs(m_filePaths.GetMiddle().c_str(), bSaveResult, 1);
2129 }
2130
2131 /**
2132  * @brief Saves right-side file with name asked
2133  */
2134 void CMergeDoc::OnFileSaveAsRight()
2135 {
2136         bool bSaveResult = false;
2137         DoSaveAs(m_filePaths.GetRight().c_str(), bSaveResult, m_nBuffers - 1);
2138 }
2139
2140 /**
2141  * @brief Enable/disable left buffer read-only
2142  */
2143 void CMergeDoc::OnFileReadOnlyLeft()
2144 {
2145         bool bReadOnly = m_ptBuf[0]->GetReadOnly();
2146         m_ptBuf[0]->SetReadOnly(!bReadOnly);
2147 }
2148
2149 /**
2150  * @brief Called when "Left read-only" item is updated
2151  */
2152 void CMergeDoc::OnUpdateFileReadOnlyLeft(CCmdUI* pCmdUI)
2153 {
2154         bool bReadOnly = m_ptBuf[0]->GetReadOnly();
2155         pCmdUI->Enable(true);
2156         pCmdUI->SetCheck(bReadOnly);
2157 }
2158
2159 /**
2160  * @brief Enable/disable middle buffer read-only
2161  */
2162 void CMergeDoc::OnFileReadOnlyMiddle()
2163 {
2164         if (m_nBuffers == 3)
2165         {
2166                 bool bReadOnly = m_ptBuf[1]->GetReadOnly();
2167                 m_ptBuf[1]->SetReadOnly(!bReadOnly);
2168         }
2169 }
2170
2171 /**
2172  * @brief Called when "Middle read-only" item is updated
2173  */
2174 void CMergeDoc::OnUpdateFileReadOnlyMiddle(CCmdUI* pCmdUI)
2175 {
2176         if (m_nBuffers < 3)
2177         {
2178                 pCmdUI->Enable(false);
2179         }
2180         else
2181         {
2182                 bool bReadOnly = m_ptBuf[1]->GetReadOnly();
2183                 pCmdUI->Enable(true);
2184                 pCmdUI->SetCheck(bReadOnly);
2185         }
2186 }
2187
2188 /**
2189  * @brief Enable/disable right buffer read-only
2190  */
2191 void CMergeDoc::OnFileReadOnlyRight()
2192 {
2193         bool bReadOnly = m_ptBuf[m_nBuffers - 1]->GetReadOnly();
2194         m_ptBuf[m_nBuffers - 1]->SetReadOnly(!bReadOnly);
2195 }
2196
2197 /**
2198  * @brief Called when "Left read-only" item is updated
2199  */
2200 void CMergeDoc::OnUpdateFileReadOnlyRight(CCmdUI* pCmdUI)
2201 {
2202         bool bReadOnly = m_ptBuf[m_nBuffers - 1]->GetReadOnly();
2203         pCmdUI->Enable(true);
2204         pCmdUI->SetCheck(bReadOnly);
2205 }
2206
2207 /**
2208  * @brief Update readonly statusbaritem
2209  */
2210 void CMergeDoc::OnUpdateStatusRO(CCmdUI* pCmdUI)
2211 {
2212         bool bRO = m_ptBuf[pCmdUI->m_nID - ID_STATUS_PANE0FILE_RO]->GetReadOnly();
2213         pCmdUI->Enable(bRO);
2214 }
2215
2216 /**
2217  * @brief Update diff-number pane text in file compare.
2218  * The diff number pane shows selected difference/amount of differences when
2219  * there is difference selected. If there is no difference selected, then
2220  * the panel shows amount of differences. If there are ignored differences,
2221  * those are not count into numbers.
2222  * @param [in] pCmdUI UI component to update.
2223  */
2224 void CMergeDoc::OnUpdateStatusNum(CCmdUI* pCmdUI)
2225 {
2226         TCHAR sIdx[32] = { 0 };
2227         TCHAR sCnt[32] = { 0 };
2228         String s;
2229         const int nDiffs = m_diffList.GetSignificantDiffs();
2230
2231         // Files are identical - show text "Identical"
2232         if (nDiffs <= 0)
2233                 s = _("Identical");
2234
2235         // There are differences, but no selected diff
2236         // - show amount of diffs
2237         else if (GetCurrentDiff() < 0)
2238         {
2239                 s = nDiffs == 1 ? _("1 Difference Found") : _("%1 Differences Found");
2240                 _itot_s(nDiffs, sCnt, 10);
2241                 strutils::replace(s, _T("%1"), sCnt);
2242         }
2243
2244         // There are differences and diff selected
2245         // - show diff number and amount of diffs
2246         else
2247         {
2248                 s = _("Difference %1 of %2");
2249                 const int signInd = m_diffList.GetSignificantIndex(GetCurrentDiff());
2250                 _itot_s(signInd + 1, sIdx, 10);
2251                 strutils::replace(s, _T("%1"), sIdx);
2252                 _itot_s(nDiffs, sCnt, 10);
2253                 strutils::replace(s, _T("%2"), sCnt);
2254         }
2255         pCmdUI->SetText(s.c_str());
2256 }
2257
2258 /**
2259  * @brief Change number of diff context lines
2260  */
2261 void CMergeDoc::OnDiffContext(UINT nID)
2262 {
2263         switch (nID)
2264         {
2265         case ID_VIEW_DIFFCONTEXT_0:
2266                 m_nDiffContext = 0; break;
2267         case ID_VIEW_DIFFCONTEXT_1:
2268                 m_nDiffContext = 1; break;
2269         case ID_VIEW_DIFFCONTEXT_3:
2270                 m_nDiffContext = 3; break;
2271         case ID_VIEW_DIFFCONTEXT_5:
2272                 m_nDiffContext = 5; break;
2273         case ID_VIEW_DIFFCONTEXT_7:
2274                 m_nDiffContext = 7; break;
2275         case ID_VIEW_DIFFCONTEXT_9:
2276                 m_nDiffContext = 9; break;
2277         case ID_VIEW_DIFFCONTEXT_TOGGLE:
2278                 m_nDiffContext = -m_nDiffContext - 1; break;
2279         case ID_VIEW_DIFFCONTEXT_ALL:
2280                 if (m_nDiffContext >= 0)
2281                         m_nDiffContext = -m_nDiffContext - 1;
2282                 break;
2283         case ID_VIEW_DIFFCONTEXT_INVERT:
2284                 m_bInvertDiffContext = !m_bInvertDiffContext;
2285                 break;
2286         }
2287         GetOptionsMgr()->SaveOption(OPT_DIFF_CONTEXT, m_nDiffContext);
2288         GetOptionsMgr()->SaveOption(OPT_INVERT_DIFF_CONTEXT, m_bInvertDiffContext);
2289         FlushAndRescan(true);
2290 }
2291
2292 /**
2293  * @brief Swap the positions of the two panes
2294  */
2295 template<int srcPane, int dstPane>
2296 void CMergeDoc::OnViewSwapPanes()
2297 {
2298         SwapFiles(srcPane, dstPane);
2299 }
2300
2301 /**
2302  * @brief Swap context enable for 3 file compares
2303  */
2304 void CMergeDoc::OnUpdateSwapContext(CCmdUI* pCmdUI)
2305 {
2306         pCmdUI->Enable(m_nBuffers > 2);
2307 }
2308
2309 /**
2310  * @brief Update number of diff context lines
2311  */
2312 void CMergeDoc::OnUpdateDiffContext(CCmdUI* pCmdUI)
2313 {
2314         bool bCheck;
2315         switch (pCmdUI->m_nID)
2316         {
2317         case ID_VIEW_DIFFCONTEXT_0:
2318                 bCheck = (m_nDiffContext == 0); break;
2319         case ID_VIEW_DIFFCONTEXT_1:
2320                 bCheck = (m_nDiffContext == 1); break;
2321         case ID_VIEW_DIFFCONTEXT_3:
2322                 bCheck = (m_nDiffContext == 3); break;
2323         case ID_VIEW_DIFFCONTEXT_5:
2324                 bCheck = (m_nDiffContext == 5); break;
2325         case ID_VIEW_DIFFCONTEXT_7:
2326                 bCheck = (m_nDiffContext == 7); break;
2327         case ID_VIEW_DIFFCONTEXT_9:
2328                 bCheck = (m_nDiffContext == 9); break;
2329         case ID_VIEW_DIFFCONTEXT_TOGGLE:
2330                 bCheck = false; break;
2331         case ID_VIEW_DIFFCONTEXT_INVERT:
2332                 bCheck = m_bInvertDiffContext; break;
2333         default:
2334                 bCheck = (m_nDiffContext < 0); break;
2335         }
2336         pCmdUI->SetCheck(bCheck);
2337         pCmdUI->Enable(!(pCmdUI->m_nID == ID_VIEW_DIFFCONTEXT_INVERT && (m_nDiffContext < 0)));
2338 }
2339
2340 /**
2341  * @brief Refresh display using text-buffers
2342  * @note This DOES NOT reload files!
2343  */
2344 void CMergeDoc::OnRefresh()
2345 {
2346         FlushAndRescan(true);
2347 }
2348
2349 /**
2350  * @brief Build the diff array and prepare buffers accordingly (insert ghost lines, set WinMerge flags)
2351  *
2352  * @note After PrimeTextBuffers(), all buffers should have the same length.
2353  */
2354 void CMergeDoc::PrimeTextBuffers()
2355 {
2356         SetCurrentDiff(-1);
2357         m_nTrivialDiffs = 0;
2358         int nDiff;
2359         int nDiffCount = m_diffList.GetSize();
2360         int file;
2361
2362         // walk the diff list and calculate numbers of extra lines to add
2363         int extras[3] = {0, 0, 0};   // extra lines added to each view
2364         m_diffList.GetExtraLinesCounts(m_nBuffers, extras);
2365
2366         // resize m_aLines once for each view
2367         UINT lcount[3] = {0, 0, 0};
2368         UINT lcountnew[3] = {0, 0, 0};
2369         UINT lcountmax = 0;
2370
2371         for (file = 0; file < m_nBuffers; file++)
2372         {
2373                 lcount[file] = m_ptBuf[file]->GetLineCount();
2374                 lcountnew[file] = lcount[file] + extras[file];
2375                 lcountmax = max(lcountmax, lcountnew[file]);
2376         }
2377         for (file = 0; file < m_nBuffers; file++)
2378         {
2379                 m_ptBuf[file]->m_aLines.resize(lcountmax);
2380         }
2381
2382         // walk the diff list backward, move existing lines to proper place,
2383         // add ghost lines, and set flags
2384         for (nDiff = nDiffCount - 1; nDiff >= 0; nDiff --)
2385         {
2386                 DIFFRANGE curDiff;
2387                 VERIFY(m_diffList.GetDiff(nDiff, curDiff));
2388
2389                 // move matched lines after curDiff
2390                 int nline[3] = { 0, 0, 0 };
2391                 for (file = 0; file < m_nBuffers; file++)
2392                         nline[file] = lcount[file] - curDiff.end[file] - 1; // #lines on left/middle/right after current diff
2393                 // Matched lines should really match...
2394                 // But matched lines after last diff may differ because of empty last line (see function's note)
2395                 if (nDiff < nDiffCount - 1)
2396                         ASSERT(nline[0] == nline[1]);
2397
2398                 int nmaxline = 0;
2399                 for (file = 0; file < m_nBuffers; file++)
2400                 {
2401                         // Move all lines after current diff down as far as needed
2402                         // for any ghost lines we're about to insert
2403                         m_ptBuf[file]->MoveLine(curDiff.end[file]+1, lcount[file]-1, lcountnew[file]-nline[file]);
2404                         lcountnew[file] -= nline[file];
2405                         lcount[file] -= nline[file];
2406                         // move unmatched lines and add ghost lines
2407                         nline[file] = curDiff.end[file] - curDiff.begin[file] + 1; // #lines in diff on left/middle/right
2408                         nmaxline = max(nmaxline, nline[file]);
2409                 }
2410
2411                 for (file = 0; file < m_nBuffers; file++)
2412                 {
2413                         DWORD dflag = LF_GHOST;
2414                         if ((file == 0 && curDiff.op == OP_3RDONLY) || (file == 2 && curDiff.op == OP_1STONLY))
2415                                 dflag |= LF_SNP;
2416                         m_ptBuf[file]->MoveLine(curDiff.begin[file], curDiff.end[file], lcountnew[file]-nmaxline);
2417                         int nextra = nmaxline - nline[file];
2418                         if (nextra > 0)
2419                         {
2420                                 m_ptBuf[file]->SetEmptyLine(lcountnew[file] - nextra, nextra);
2421                                 for (int i = 1; i <= nextra; i++)
2422                                         m_ptBuf[file]->SetLineFlag(lcountnew[file]-i, dflag, true, false, false);
2423                         }
2424                         lcountnew[file] -= nmaxline;
2425
2426                         lcount[file] -= nline[file];
2427
2428                 }
2429                 // set dbegin, dend, blank, and line flags
2430                 curDiff.dbegin = lcountnew[0];
2431
2432                 switch (curDiff.op)
2433                 {
2434                 case OP_TRIVIAL:
2435                         ++m_nTrivialDiffs;
2436                         [[fallthrough]];
2437                 case OP_DIFF:
2438                 case OP_1STONLY:
2439                 case OP_2NDONLY:
2440                 case OP_3RDONLY:
2441                         // set curdiff
2442                         {
2443                                 curDiff.dend = lcountnew[0]+nmaxline-1;
2444                                 for (file = 0; file < m_nBuffers; file++)
2445                                 {
2446                                         curDiff.blank[file] = -1;
2447                                         int nextra = nmaxline - nline[file];
2448                                         if (nmaxline > nline[file])
2449                                         {
2450                                                 // more lines on left, ghost lines on right side
2451                                                 curDiff.blank[file] = curDiff.dend + 1 - nextra;
2452                                         }
2453                                 }
2454                         }
2455                         // flag lines
2456                         {
2457                                 for (file = 0; file < m_nBuffers; file++)
2458                                 {
2459                                         // left side
2460                                         int i;
2461                                         for (i = curDiff.dbegin; i <= curDiff.dend; i++)
2462                                         {
2463                                                 if (curDiff.blank[file] == -1 || (int)i < curDiff.blank[file])
2464                                                 {
2465                                                         // set diff or trivial flag
2466                                                         DWORD dflag = (curDiff.op == OP_TRIVIAL) ? LF_TRIVIAL : LF_DIFF;
2467                                                         if ((file == 0 && curDiff.op == OP_3RDONLY) || (file == 2 && curDiff.op == OP_1STONLY))
2468                                                                 dflag |= LF_SNP;
2469                                                         m_ptBuf[file]->SetLineFlag(i, dflag, true, false, false);
2470                                                         m_ptBuf[file]->SetLineFlag(i, LF_INVISIBLE, false, false, false);
2471                                                 }
2472                                                 else
2473                                                 {
2474                                                         // ghost lines are already inserted (and flagged)
2475                                                         // ghost lines opposite to trivial lines are ghost and trivial
2476                                                         if (curDiff.op == OP_TRIVIAL)
2477                                                                 m_ptBuf[file]->SetLineFlag(i, LF_TRIVIAL, true, false, false);
2478                                                 }
2479                                         }
2480                                 }
2481                         }
2482                         break;
2483                 }           // switch (curDiff.op)
2484                 VERIFY(m_diffList.SetDiff(nDiff, curDiff));
2485         }             // for (nDiff = nDiffCount; nDiff-- > 0; )
2486
2487         m_diffList.ConstructSignificantChain();
2488
2489 #ifdef _DEBUG
2490         // Note: By this point all `m_ptBuf[]` buffers must have the same
2491         //              number of line entries; eventual buffer processing typically
2492         //              uses the line count from `m_ptBuf[0]` for all buffer processing.
2493
2494         for (file = 0; file < m_nBuffers; file++)
2495         {
2496                 ASSERT(m_ptBuf[0]->GetLineCount() == m_ptBuf[file]->GetLineCount());
2497         }
2498 #endif
2499
2500         for (file = 0; file < m_nBuffers; file++)
2501                 m_ptBuf[file]->FinishLoading();
2502 }
2503
2504 /**
2505  * @brief Checks if file has changed since last update (save or rescan).
2506  * @param [in] szPath File to check
2507  * @param [in] dfi Previous fileinfo of file
2508  * @param [in] bSave If true Compare to last save-info, else to rescan-info
2509  * @param [in] nBuffer Index (0-based) of buffer
2510  * @return true if file is changed.
2511  */
2512 CMergeDoc::FileChange CMergeDoc::IsFileChangedOnDisk(LPCTSTR szPath, DiffFileInfo &dfi,
2513         bool bSave, int nBuffer)
2514 {
2515         DiffFileInfo *fileInfo = nullptr;
2516         bool bFileChanged = false;
2517         bool bIgnoreSmallDiff = GetOptionsMgr()->GetBool(OPT_IGNORE_SMALL_FILETIME);
2518         int tolerance = 0;
2519         if (bIgnoreSmallDiff)
2520                 tolerance = SmallTimeDiff; // From MainFrm.h
2521
2522         if (bSave)
2523                 fileInfo = m_pSaveFileInfo[nBuffer].get();
2524         else
2525                 fileInfo = m_pRescanFileInfo[nBuffer].get();
2526
2527         // We assume file existed, so disappearing means removal
2528         if (!dfi.Update(szPath))
2529                 return FileChange::Removed;
2530
2531         int64_t timeDiff = dfi.mtime - fileInfo->mtime;
2532         if (timeDiff < 0) timeDiff = -timeDiff;
2533         if ((timeDiff > tolerance * Poco::Timestamp::resolution()) || (dfi.size != fileInfo->size))
2534         {
2535                 bFileChanged = true;
2536         }
2537
2538         if (bFileChanged)
2539                 return FileChange::Changed;
2540         else
2541                 return FileChange::NoChange;
2542 }
2543
2544 void CMergeDoc::HideLines()
2545 {
2546         int nLine;
2547         int file;
2548
2549         if (m_nDiffContext < 0)
2550         {
2551                 ForEachView([](auto& pView) { pView->SetEnableHideLines(false); });
2552                 return;
2553         }
2554
2555         int nLineCount = 0x7fffffff;
2556         for (file = 0; file < m_nBuffers; file++)
2557         {
2558                 if (nLineCount > m_ptBuf[file]->GetLineCount())
2559                         nLineCount = m_ptBuf[file]->GetLineCount();
2560         }
2561
2562         for (nLine =  0; nLine < nLineCount;)
2563         {
2564                 bool diff = !!(m_ptBuf[0]->GetLineFlags(nLine) & (LF_DIFF | LF_GHOST));
2565                 if ((!m_bInvertDiffContext && !diff) || (m_bInvertDiffContext && diff))
2566                 {
2567                         for (file = 0; file < m_nBuffers; file++)
2568                                 m_ptBuf[file]->SetLineFlag(nLine, LF_INVISIBLE, true, false, false);
2569                         nLine++;
2570                 }
2571                 else
2572                 {
2573                         int nLine2 = (nLine - m_nDiffContext < 0) ? 0 : (nLine - m_nDiffContext);
2574                         for (; nLine2 < nLine; nLine2++)
2575                         {
2576                                 for (file = 0; file < m_nBuffers; file++)
2577                                         m_ptBuf[file]->SetLineFlag(nLine2, LF_INVISIBLE, false, false, false);
2578                         }
2579
2580                         for (; nLine < nLineCount; nLine++)
2581                         {
2582                                 diff = !!(m_ptBuf[0]->GetLineFlags(nLine) & (LF_DIFF | LF_GHOST));
2583                                 if ((!m_bInvertDiffContext && !diff) || (m_bInvertDiffContext && diff))
2584                                         break;
2585                                 for (file = 0; file < m_nBuffers; file++)
2586                                         m_ptBuf[file]->SetLineFlag(nLine, LF_INVISIBLE, false, false, false);
2587                         }
2588
2589                         int nLineEnd2 = (nLine + m_nDiffContext >= nLineCount) ? nLineCount-1 : (nLine + m_nDiffContext);
2590                         for (; nLine < nLineEnd2; nLine++)
2591                         {
2592                                 for (file = 0; file < m_nBuffers; file++)
2593                                         m_ptBuf[file]->SetLineFlag(nLine, LF_INVISIBLE, false, false, false);
2594                                 diff = !!(m_ptBuf[0]->GetLineFlags(nLine) & (LF_DIFF | LF_GHOST));
2595                                 if ((!m_bInvertDiffContext && diff) || (m_bInvertDiffContext && !diff))
2596                                         nLineEnd2 = (nLine + 1 + m_nDiffContext >= nLineCount) ? nLineCount-1 : (nLine + 1 + m_nDiffContext);
2597                         }
2598                 }
2599         }
2600
2601         ForEachView([](auto& pView) { pView->SetEnableHideLines(true); });
2602 }
2603
2604 /**
2605  * @brief Asks and then saves modified files.
2606  *
2607  * This function saves modified files. Dialog is shown for user to select
2608  * modified file(s) one wants to save or discard changed. Cancelling of
2609  * save operation is allowed unless denied by parameter. After successfully
2610  * save operation file statuses are updated to directory compare.
2611  * @param [in] bAllowCancel If false "Cancel" button is disabled.
2612  * @return true if user selected "OK" so next operation can be
2613  * executed. If false user choosed "Cancel".
2614  * @note If filename is empty, we assume scratchpads are saved,
2615  * so instead of filename, description is shown.
2616  * @todo If we have filename and description for file, what should
2617  * we do after saving to different filename? Empty description?
2618  * @todo Parameter @p bAllowCancel is always true in callers - can be removed.
2619  */
2620 bool CMergeDoc::PromptAndSaveIfNeeded(bool bAllowCancel)
2621 {
2622         bool bLModified = false, bMModified = false, bRModified = false;
2623         bool result = true;
2624         bool bLSaveSuccess = false, bMSaveSuccess = false, bRSaveSuccess = false;
2625
2626         if (m_nBuffers == 3)
2627         {
2628                 bLModified = m_ptBuf[0]->IsModified();
2629                 bMModified = m_ptBuf[1]->IsModified();
2630                 bRModified = m_ptBuf[2]->IsModified();
2631         }
2632         else
2633         {
2634                 bLModified = m_ptBuf[0]->IsModified();
2635                 bRModified = m_ptBuf[1]->IsModified();
2636         }
2637         if (!bLModified && !bMModified && !bRModified)
2638                  return true;
2639
2640         SaveClosingDlg dlg;
2641         dlg.DoAskFor(bLModified, bMModified, bRModified);
2642         if (!bAllowCancel)
2643                 dlg.m_bDisableCancel = true;
2644         if (!m_filePaths.GetLeft().empty())
2645         {
2646                 if (theApp.m_strSaveAsPath.empty())
2647                         dlg.m_sLeftFile = m_filePaths.GetLeft();
2648                 else
2649                         dlg.m_sLeftFile = theApp.m_strSaveAsPath;
2650         }
2651         else
2652                 dlg.m_sLeftFile = m_strDesc[0];
2653         if (m_nBuffers == 3)
2654         {
2655                 if (!m_filePaths.GetMiddle().empty())
2656                 {
2657                         if (theApp.m_strSaveAsPath.empty())
2658                                 dlg.m_sMiddleFile = m_filePaths.GetMiddle();
2659                         else
2660                                 dlg.m_sMiddleFile = theApp.m_strSaveAsPath;
2661                 }
2662                 else
2663                         dlg.m_sMiddleFile = m_strDesc[1];
2664         }
2665         if (!m_filePaths.GetRight().empty())
2666         {
2667                 if (theApp.m_strSaveAsPath.empty())
2668                         dlg.m_sRightFile = m_filePaths.GetRight();
2669                 else
2670                         dlg.m_sRightFile = theApp.m_strSaveAsPath;
2671         }
2672         else
2673                 dlg.m_sRightFile = m_strDesc[m_nBuffers - 1];
2674
2675         if (dlg.DoModal() == IDOK)
2676         {
2677                 if (bLModified && dlg.m_leftSave == SaveClosingDlg::SAVECLOSING_SAVE)
2678                 {
2679                         if (!DoSave(m_filePaths.GetLeft().c_str(), bLSaveSuccess, 0))
2680                                 result = false;
2681                 }
2682
2683                 if (bMModified && dlg.m_middleSave == SaveClosingDlg::SAVECLOSING_SAVE)
2684                 {
2685                         if (!DoSave(m_filePaths.GetMiddle().c_str(), bMSaveSuccess, 1))
2686                                 result = false;
2687                 }
2688
2689                 if (bRModified && dlg.m_rightSave == SaveClosingDlg::SAVECLOSING_SAVE)
2690                 {
2691                         if (!DoSave(m_filePaths.GetRight().c_str(), bRSaveSuccess, m_nBuffers - 1))
2692                                 result = false;
2693                 }
2694         }
2695         else
2696         {
2697                 result = false;
2698         }
2699
2700         // If file were modified and saving was successfull,
2701         // update status on dir view
2702         if ((bLModified && bLSaveSuccess) ||
2703              (bMModified && bMSaveSuccess) ||
2704                  (bRModified && bRSaveSuccess))
2705         {
2706                 // If directory compare has results
2707                 if (m_pDirDoc != nullptr && m_pDirDoc->HasDiffs())
2708                 {
2709                         if (m_bEditAfterRescan[0] || m_bEditAfterRescan[1] || (m_nBuffers == 3 && m_bEditAfterRescan[2]))
2710                                 FlushAndRescan(false);
2711
2712                         bool bIdentical = !m_diffList.HasSignificantDiffs(); // True if status should be set to identical
2713                         m_pDirDoc->UpdateChangedItem(m_filePaths, m_diffList.GetSignificantDiffs(),
2714                                         m_nTrivialDiffs, bIdentical);
2715                 }
2716         }
2717
2718         return result;
2719 }
2720
2721 /** Rescan only if we did not Rescan during the last timeOutInSecond seconds*/
2722 void CMergeDoc::RescanIfNeeded(float timeOutInSecond)
2723 {
2724         // if we did not rescan during the request timeOut, Rescan
2725         // else we did Rescan after the request, so do nothing
2726         COleDateTimeSpan elapsed = COleDateTime::GetCurrentTime() - m_LastRescan;
2727         if (elapsed.GetTotalSeconds() >= timeOutInSecond)
2728                 // (laoran 08-01-2003) maybe should be FlushAndRescan(true) ??
2729                 FlushAndRescan();
2730 }
2731
2732 /**
2733  * @brief We have two child views (left & right), so we keep pointers directly
2734  * at them (the MFC view list doesn't have them both)
2735  */
2736 void CMergeDoc::AddMergeViews(CMergeEditView *pView[3])
2737 {
2738
2739         for (int nBuffer = 0; nBuffer < m_nBuffers; nBuffer++)
2740                 m_pView[m_nGroups][nBuffer] = pView[nBuffer];
2741         ++m_nGroups;
2742 }
2743
2744 void CMergeDoc::RemoveMergeViews(int nGroup)
2745 {
2746
2747         for (; nGroup < m_nGroups - 1; nGroup++)
2748         {
2749                 for (int nBuffer = 0; nBuffer < m_nBuffers; nBuffer++)
2750                 {
2751                         m_pView[nGroup][nBuffer] = m_pView[nGroup + 1][nBuffer];
2752                         m_pView[nGroup][nBuffer]->m_nThisGroup = nGroup;
2753                 }
2754         }
2755         --m_nGroups;
2756 }
2757
2758 /**
2759  * @brief DirDoc gives us its identity just after it creates us
2760  */
2761 void CMergeDoc::SetDirDoc(CDirDoc * pDirDoc)
2762 {
2763         ASSERT(pDirDoc != nullptr && m_pDirDoc == nullptr);
2764         m_pDirDoc = pDirDoc;
2765 }
2766
2767 /**
2768  * @brief Return pointer to parent frame
2769  */
2770 CMergeEditFrame * CMergeDoc::GetParentFrame()
2771 {
2772         return dynamic_cast<CMergeEditFrame *>(m_pView[0][0]->GetParentFrame());
2773 }
2774
2775 /**
2776  * @brief DirDoc is closing
2777  */
2778 void CMergeDoc::DirDocClosing(CDirDoc * pDirDoc)
2779 {
2780         ASSERT(m_pDirDoc == pDirDoc);
2781         m_pDirDoc = nullptr;
2782         // TODO (Perry 2003-03-30): perhaps merge doc should close now ?
2783 }
2784
2785 /**
2786  * @brief DirDoc commanding us to close
2787  */
2788 bool CMergeDoc::CloseNow()
2789 {
2790         // Allow user to cancel closing
2791         if (!PromptAndSaveIfNeeded(true))
2792                 return false;
2793
2794         GetParentFrame()->DestroyWindow();
2795         return true;
2796 }
2797
2798 /**
2799  * @brief Loads file to buffer and shows load-errors
2800  * @param [in] sFileName File to open
2801  * @param [in] nBuffer Index (0-based) of buffer to load
2802  * @param [out] readOnly whether file is read-only
2803  * @param [in] encoding encoding used
2804  * @return Tells if files were loaded successfully
2805  * @sa CMergeDoc::OpenDocs()
2806  **/
2807 int CMergeDoc::LoadFile(CString sFileName, int nBuffer, bool & readOnly, const FileTextEncoding & encoding)
2808 {
2809         String sError;
2810         DWORD retVal = FileLoadResult::FRESULT_ERROR;
2811
2812         CDiffTextBuffer *pBuf = m_ptBuf[nBuffer].get();
2813         m_filePaths[nBuffer] = sFileName;
2814
2815         CRLFSTYLE nCrlfStyle = CRLFSTYLE::AUTOMATIC;
2816         CString sOpenError;
2817         retVal = pBuf->LoadFromFile(sFileName, m_infoUnpacker,
2818                 m_strBothFilenames.c_str(), readOnly, nCrlfStyle, encoding, sOpenError);
2819
2820         // if CMergeDoc::CDiffTextBuffer::LoadFromFile failed,
2821         // it left the pBuf in a valid (but empty) state via a call to InitNew
2822
2823         if (FileLoadResult::IsOkImpure(retVal))
2824         {
2825                 // File loaded, and multiple EOL types in this file
2826                 FileLoadResult::SetMainOk(retVal);
2827
2828                 // If mixed EOLs are not enabled, enable them for this doc.
2829                 if (!GetOptionsMgr()->GetBool(OPT_ALLOW_MIXED_EOL))
2830                 {
2831                         pBuf->SetMixedEOL(true);
2832                 }
2833         }
2834
2835         if (FileLoadResult::IsError(retVal))
2836         {
2837                 // Error from Unifile/system
2838                 if (!sOpenError.IsEmpty())
2839                         sError = strutils::format_string2(_("Cannot open file\n%1\n\n%2"), (LPCTSTR)sFileName, (LPCTSTR)sOpenError);
2840                 else
2841                         sError = strutils::format_string1(_("File not found: %1"), (LPCTSTR)sFileName);
2842                 ShowMessageBox(sError, MB_OK | MB_ICONSTOP | MB_MODELESS);
2843         }
2844         else if (FileLoadResult::IsErrorUnpack(retVal))
2845         {
2846                 sError = strutils::format_string1(_("File not unpacked: %1"), (LPCTSTR)sFileName);
2847                 ShowMessageBox(sError, MB_OK | MB_ICONSTOP | MB_MODELESS);
2848         }
2849         return retVal;
2850 }
2851
2852 /**
2853  * @brief Check if specified codepage number is valid for WinMerge Editor.
2854  * @param [in] cp Codepage number to check.
2855  * @return true if codepage is valid, false otherwise.
2856  */
2857 bool CMergeDoc::IsValidCodepageForMergeEditor(unsigned cp) const
2858 {
2859         if (cp == 0) // 0 is our signal value for invalid
2860                 return false;
2861         return GetEncodingNameFromCodePage(cp) != nullptr;
2862 }
2863
2864 /**
2865  * @brief Sanity check file's specified codepage.
2866  * This function checks if file's specified codepage is valid for WinMerge
2867  * editor and if not resets the codepage to default.
2868  * @param [in,out] fileinfo Class containing file's codepage.
2869  */
2870 void CMergeDoc::SanityCheckCodepage(FileLocation & fileinfo)
2871 {
2872         if (fileinfo.encoding.m_unicoding == ucr::NONE
2873                 && !IsValidCodepageForMergeEditor(fileinfo.encoding.m_codepage))
2874         {
2875                 int cp = ucr::getDefaultCodepage();
2876                 if (!IsValidCodepageForMergeEditor(cp))
2877                         cp = CP_ACP;
2878                 fileinfo.encoding.SetCodepage(cp);
2879         }
2880 }
2881
2882 /**
2883  * @brief Loads one file from disk and updates file infos.
2884  * @param [in] index Index of file in internal buffers.
2885  * @param [in] filename File's name.
2886  * @param [in] readOnly Is file read-only?
2887  * @param [in] encoding File's encoding.
2888  * @return One of FileLoadResult values.
2889  */
2890 DWORD CMergeDoc::LoadOneFile(int index, String filename, bool readOnly, const String& strDesc,
2891                 const FileTextEncoding & encoding)
2892 {
2893         DWORD loadSuccess = FileLoadResult::FRESULT_ERROR;;
2894
2895         m_strDesc[index] = strDesc;
2896         if (!filename.empty())
2897         {
2898                 if (strDesc.empty())
2899                         m_nBufferType[index] = BUFFERTYPE::NORMAL;
2900                 else
2901                         m_nBufferType[index] = BUFFERTYPE::NORMAL_NAMED;
2902                 m_pSaveFileInfo[index]->Update(filename);
2903                 m_pRescanFileInfo[index]->Update(filename);
2904
2905                 loadSuccess = LoadFile(filename.c_str(), index, readOnly, encoding);
2906                 if (FileLoadResult::IsLossy(loadSuccess))
2907                 {
2908                         // Determine the file encoding by looking at all the contents of the file, not just part of it
2909                         FileTextEncoding encodingNew = codepage_detect::Guess(filename, GetOptionsMgr()->GetInt(OPT_CP_DETECT), -1);
2910                         if (encoding != encodingNew)
2911                         {
2912                                 m_ptBuf[index]->FreeAll();
2913                                 loadSuccess = LoadFile(filename.c_str(), index, readOnly, encodingNew);
2914                         }
2915                 }
2916         }
2917         else
2918         {
2919                 m_nBufferType[index] = BUFFERTYPE::UNNAMED;
2920                 m_ptBuf[index]->InitNew();
2921                 m_ptBuf[index]->m_encoding = encoding;
2922                 m_ptBuf[index]->FinishLoading(); // should clear GGhostTextBuffer::m_RealityBlock when reloading unnamed buffer
2923                 loadSuccess = FileLoadResult::FRESULT_OK;
2924         }
2925         return loadSuccess;
2926 }
2927
2928 CMergeDoc::TableProps CMergeDoc::MakeTablePropertiesByFileName(const String& path, const std::optional<bool>& enableTableEditing, bool showDialog)
2929 {
2930         const TCHAR quote = strutils::from_charstr(GetOptionsMgr()->GetString(OPT_CMP_TBL_QUOTE_CHAR));
2931         FileFilterHelper filterCSV, filterTSV, filterDSV;
2932         bool allowNewlineIQuotes = GetOptionsMgr()->GetBool(OPT_CMP_TBL_ALLOW_NEWLINES_IN_QUOTES);
2933         const String csvFilePattern = GetOptionsMgr()->GetString(OPT_CMP_CSV_FILEPATTERNS);
2934         if (!csvFilePattern.empty())
2935         {
2936                 filterCSV.UseMask(true);
2937                 filterCSV.SetMask(csvFilePattern);
2938                 if (filterCSV.includeFile(path))
2939                         return { true, ',', quote, allowNewlineIQuotes };
2940         }
2941         const String tsvFilePattern = GetOptionsMgr()->GetString(OPT_CMP_TSV_FILEPATTERNS);
2942         if (!tsvFilePattern.empty())
2943         {
2944                 filterTSV.UseMask(true);
2945                 filterTSV.SetMask(tsvFilePattern);
2946                 if (filterTSV.includeFile(path))
2947                         return { true, '\t', quote, allowNewlineIQuotes };
2948         }
2949         const String dsvFilePattern = GetOptionsMgr()->GetString(OPT_CMP_DSV_FILEPATTERNS);
2950         if (!dsvFilePattern.empty())
2951         {
2952                 filterDSV.UseMask(true);
2953                 filterDSV.SetMask(dsvFilePattern);
2954                 if (filterDSV.includeFile(path))
2955                         return { true, strutils::from_charstr(GetOptionsMgr()->GetString(OPT_CMP_DSV_DELIM_CHAR)), quote };
2956         }
2957         if (enableTableEditing.value_or(false))
2958         {
2959                 if (showDialog)
2960                 {
2961                         COpenTableDlg dlg;
2962                         if (dlg.DoModal() == IDOK)
2963                                 return { true, strutils::from_charstr(dlg.m_sDelimiterChar), strutils::from_charstr(dlg.m_sQuoteChar), dlg.m_bAllowNewlinesInQuotes };
2964                 }
2965                 else
2966                 {
2967                         return { true, strutils::from_charstr(GetOptionsMgr()->GetString(OPT_CMP_DSV_DELIM_CHAR)), quote };
2968                 }
2969         }
2970         return { false, 0, 0, false };
2971 };
2972
2973 void CMergeDoc::SetTableProperties()
2974 {
2975         TableProps tableProps[3] = { };
2976         int nTableFileIndex = -1;
2977         if (m_pTablePropsPrepared)
2978         {
2979                 nTableFileIndex = 0;
2980                 tableProps[0] = *m_pTablePropsPrepared;
2981         }
2982         else
2983         {
2984                 for (int nBuffer = 0; nBuffer < m_nBuffers; nBuffer++)
2985                 {
2986                         if (nBuffer == 0 ||
2987                                 paths::FindExtension(m_ptBuf[nBuffer - 1]->GetTempFileName()) != paths::FindExtension(m_ptBuf[nBuffer]->GetTempFileName()))
2988                                 tableProps[nBuffer] = MakeTablePropertiesByFileName(m_ptBuf[nBuffer]->GetTempFileName(), m_bEnableTableEditing);
2989                         else
2990                                 tableProps[nBuffer] = tableProps[nBuffer - 1];
2991                         if (tableProps[nBuffer].istable)
2992                                 nTableFileIndex = nBuffer;
2993                 }
2994         }
2995         for (int nBuffer = 0; nBuffer < m_nBuffers; nBuffer++)
2996         {
2997                 if (m_bEnableTableEditing.value_or(true) && nTableFileIndex >= 0)
2998                 {
2999                         int i = tableProps[nBuffer].istable ? nBuffer : nTableFileIndex;
3000                         m_ptBuf[nBuffer]->SetTableEditing(true);
3001                         m_ptBuf[nBuffer]->ShareColumnWidths(*m_ptBuf[0]);
3002                         m_ptBuf[nBuffer]->SetAllowNewlinesInQuotes(tableProps[i].allowNewlinesInQuotes);
3003                         m_ptBuf[nBuffer]->SetFieldDelimiter(tableProps[i].delimiter);
3004                         m_ptBuf[nBuffer]->SetFieldEnclosure(tableProps[i].quote);
3005                         m_ptBuf[nBuffer]->JoinLinesForTableEditingMode();
3006                 }
3007                 else
3008                 {
3009                         m_ptBuf[nBuffer]->SetTableEditing(false);
3010                 }
3011         }
3012 }
3013
3014 void CMergeDoc::SetTextType(int textType)
3015 {
3016         ForEachView([textType, this](auto& pView) {
3017                 pView->SetTextType(CrystalLineParser::TextType(textType));
3018                 pView->SetDisableBSAtSOL(false);
3019                 m_bChangedSchemeManually = true;
3020         });
3021 }
3022
3023 void CMergeDoc::SetTextType(const String& ext)
3024 {
3025         String ext2 = ext;
3026         strutils::replace(ext2, _T("."), _T(""));
3027         ForEachView([&ext2, this](auto& pView) {
3028                 pView->SetTextType(ext2.c_str());
3029                 pView->SetDisableBSAtSOL(false);
3030                 m_bChangedSchemeManually = true;
3031         });
3032 }
3033
3034 /**
3035  * @brief Loads files and does initial rescan.
3036  * @param fileloc [in] File to open to left/middle/right side (path & encoding info)
3037  * @param bRO [in] Is left/middle/right file read-only
3038  * @return Success/Failure/Binary (failure) per typedef enum OpenDocsResult_TYPE
3039  * @todo Options are still read from CMainFrame, this will change
3040  * @sa CMainFrame::ShowTextMergeDoc()
3041  */
3042 bool CMergeDoc::OpenDocs(int nFiles, const FileLocation ifileloc[],
3043                 const bool bRO[], const String strDesc[])
3044 {
3045         CWaitCursor waitstatus;
3046         IDENTLEVEL identical = IDENTLEVEL::NONE;
3047         int nRescanResult = RESCAN_OK;
3048         int nBuffer;
3049         FileLocation fileloc[3];
3050
3051         std::copy_n(ifileloc, 3, fileloc);
3052
3053         // Filter out invalid codepages, or editor will display all blank
3054         for (nBuffer = 0; nBuffer < m_nBuffers; nBuffer++)
3055                 SanityCheckCodepage(fileloc[nBuffer]);
3056
3057         // clear undo stack
3058         undoTgt.clear();
3059         curUndo = undoTgt.begin();
3060
3061         // Prevent displaying views during LoadFile
3062         // Note : attach buffer again only if both loads succeed
3063         m_strBothFilenames.erase();
3064
3065         ForEachView([](auto& pView) { pView->DetachFromBuffer(); });
3066
3067         for (nBuffer = 0; nBuffer < m_nBuffers; nBuffer++)
3068         {
3069                 // clear undo buffers
3070                 m_ptBuf[nBuffer]->m_aUndoBuf.clear();
3071
3072                 // free the buffers
3073                 m_ptBuf[nBuffer]->FreeAll ();
3074
3075                 // build the text being filtered, "|" separates files as it is forbidden in filenames
3076                 m_strBothFilenames += fileloc[nBuffer].filepath + _T("|");
3077         }
3078         m_strBothFilenames.erase(m_strBothFilenames.length() - 1);
3079
3080         // Load files
3081         DWORD nSuccess[3] = { FileLoadResult::FRESULT_ERROR,  FileLoadResult::FRESULT_ERROR,  FileLoadResult::FRESULT_ERROR };
3082         for (nBuffer = 0; nBuffer < m_nBuffers; nBuffer++)
3083         {
3084                 nSuccess[nBuffer] = LoadOneFile(nBuffer, fileloc[nBuffer].filepath, bRO[nBuffer], strDesc ? strDesc[nBuffer] : _T(""),
3085                         fileloc[nBuffer].encoding);
3086                 if (!FileLoadResult::IsOk(nSuccess[nBuffer]))
3087                 {
3088                         CMergeEditFrame* pFrame = GetParentFrame();
3089                         if (pFrame != nullptr)
3090                         {
3091                                 // Use verify macro to trap possible error in debug.
3092                                 VERIFY(pFrame->DestroyWindow());
3093                         }
3094                         return false;
3095                 }
3096         }
3097
3098         SetTableProperties();
3099
3100         const bool bFiltersEnabled = GetOptionsMgr()->GetBool(OPT_PLUGINS_ENABLED);
3101
3102         // scratchpad : we don't call LoadFile, so
3103         // we need to initialize the unpacker as a "do nothing" one
3104         if (bFiltersEnabled)
3105         {
3106                 if (std::count(m_nBufferType, m_nBufferType + m_nBuffers, BUFFERTYPE::UNNAMED) == m_nBuffers)
3107                 {
3108                         m_infoUnpacker.Initialize(false);
3109                 }
3110         }
3111
3112         // Warn user if file load was lossy (bad encoding)
3113         int idres=0;
3114         int nLossyBuffers = 0;
3115         for (nBuffer = 0; nBuffer < m_nBuffers; nBuffer++)
3116         {
3117                 if (FileLoadResult::IsLossy(nSuccess[nBuffer]))
3118                 {
3119                         // TODO: It would be nice to report how many lines were lossy
3120                         // we did calculate those numbers when we loaded the files, in the text stats
3121
3122                         idres = IDS_LOSSY_TRANSCODING_FIRST + nBuffer;
3123                         nLossyBuffers++;
3124                 }
3125         }
3126         if (nLossyBuffers > 1)
3127                 idres = IDS_LOSSY_TRANSCODING_BOTH; /* FIXEME */
3128
3129         if (nLossyBuffers > 0)
3130         {
3131                 if (m_pEncodingErrorBar == nullptr)
3132                 {
3133                         m_pEncodingErrorBar.reset(new CEncodingErrorBar());
3134                         m_pEncodingErrorBar->Create(this->m_pView[0][0]->GetParentFrame());
3135                 }
3136                 m_pEncodingErrorBar->SetText(LoadResString(idres));
3137                 m_pView[0][0]->GetParentFrame()->ShowControlBar(m_pEncodingErrorBar.get(), TRUE, FALSE);
3138         }
3139
3140         ForEachView([](auto& pView) {
3141                 // Now buffers data are valid
3142                 pView->AttachToBuffer();
3143                 // Currently there is only one set of syntax colors, which all documents & views share
3144                 pView->SetColorContext(theApp.GetMainSyntaxColors());
3145                 // Currently there is only one set of markers, which all documents & views share
3146                 pView->SetMarkersContext(theApp.GetMainMarkers());
3147         });
3148         for (nBuffer = 0; nBuffer < m_nBuffers; nBuffer++)
3149         {
3150                 // Set read-only statuses
3151                 m_ptBuf[nBuffer]->SetReadOnly(bRO[nBuffer]);
3152         }
3153
3154         // Check the EOL sensitivity option (do it before Rescan)
3155         DIFFOPTIONS diffOptions = {0};
3156         m_diffWrapper.GetOptions(&diffOptions);
3157         if (!GetOptionsMgr()->GetBool(OPT_ALLOW_MIXED_EOL) && !diffOptions.bIgnoreEol)
3158         {
3159                 for (nBuffer = 1; nBuffer < m_nBuffers; nBuffer++)
3160                         if (m_ptBuf[0]->GetCRLFMode() != m_ptBuf[nBuffer]->GetCRLFMode())
3161                                 break;
3162
3163                 if (nBuffer < m_nBuffers)
3164                 {
3165                         // Options and files not are not compatible :
3166                         // Sensitive to EOL on, allow mixing EOL off, and files have a different EOL style.
3167                         // All lines will differ, that is not very interesting and probably not wanted.
3168                         // Propose to turn off the option 'sensitive to EOL'
3169                         String s = theApp.LoadString(IDS_SUGGEST_IGNOREEOL);
3170                         if (ShowMessageBox(s, MB_YESNO | MB_ICONWARNING | MB_DONT_ASK_AGAIN, IDS_SUGGEST_IGNOREEOL) == IDYES)
3171                         {
3172                                 diffOptions.bIgnoreEol = true;
3173                                 m_diffWrapper.SetOptions(&diffOptions);
3174
3175                                 CMessageBoxDialog dlg(nullptr, s.c_str(), _T(""), 0, IDS_SUGGEST_IGNOREEOL);
3176                                 const int nFormerResult = dlg.GetFormerResult();
3177                                 if (nFormerResult != -1)
3178                                 {
3179                                         // "Don't ask this question again" checkbox is checked
3180                                         GetOptionsMgr()->SaveOption(OPT_CMP_IGNORE_EOL, true);
3181                                 }
3182                         }
3183                 }
3184         }
3185
3186         // Define the prediffer
3187         PackingInfo * infoUnpacker = nullptr;
3188         PrediffingInfo * infoPrediffer = nullptr;
3189         if (bFiltersEnabled && m_pDirDoc != nullptr)
3190         {
3191                 m_pDirDoc->GetPluginManager().FetchPluginInfos(m_strBothFilenames, &infoUnpacker, &infoPrediffer);
3192                 m_diffWrapper.SetPrediffer(infoPrediffer);
3193                 m_diffWrapper.SetTextForAutomaticPrediff(m_strBothFilenames);
3194         }
3195
3196         bool bBinary = false;
3197         nRescanResult = Rescan(bBinary, identical);
3198
3199         // Open filed if rescan succeed and files are not binaries
3200         if (nRescanResult == RESCAN_OK)
3201         {
3202                 // set the document types
3203                 // Warning : it is the first thing to do (must be done before UpdateView,
3204                 // or any function that calls UpdateView, like SelectDiff)
3205                 // Note: If option enabled, and another side type is not recognized,
3206                 // we use recognized type for unrecognized side too.
3207                 String sext[3];
3208                 bool bTyped[3];
3209                 int paneTyped = 0;
3210
3211                 for (nBuffer = 0; nBuffer < m_nBuffers; nBuffer++)
3212                 {
3213                         sext[nBuffer] = GetFileExt(m_ptBuf[nBuffer]->GetTempFileName().c_str(), m_strDesc[nBuffer].c_str());
3214                         ForEachView(nBuffer, [&](auto& pView) {
3215                                 bTyped[nBuffer] = pView->SetTextType(sext[nBuffer].c_str());
3216                                 if (bTyped[nBuffer])
3217                                         paneTyped = nBuffer;
3218                         });
3219                 }
3220
3221                 for (nBuffer = 1; nBuffer < m_nBuffers; nBuffer++)
3222                 {
3223                         if (bTyped[0] != bTyped[nBuffer])
3224                                 break;
3225                 }
3226
3227                 bool syntaxHLEnabled = GetOptionsMgr()->GetBool(OPT_SYNTAX_HIGHLIGHT);
3228                 if (syntaxHLEnabled && nBuffer < m_nBuffers)
3229                 {
3230                         if (std::count(bTyped, bTyped + m_nBuffers, false) == m_nBuffers)
3231                         {
3232                                 CString sFirstLine;
3233                                 m_ptBuf[0]->GetLine(0, sFirstLine);
3234                                 for (nBuffer = 0; nBuffer < m_nBuffers; nBuffer++)
3235                                 {
3236                                         bTyped[nBuffer] = GetView(0, nBuffer)->SetTextTypeByContent(sFirstLine);
3237                                 }
3238                         }
3239                 }
3240
3241                 if (syntaxHLEnabled)
3242                 {
3243                         CrystalLineParser::TextDefinition *enuType = CrystalLineParser::GetTextType(sext[paneTyped].c_str());
3244                         ForEachView([&bTyped, enuType](auto& pView) {
3245                                 if (!bTyped[pView->m_nThisPane])
3246                                         pView->SetTextType(enuType);
3247                         });
3248                 }
3249
3250                 int nNormalBuffer = 0;
3251                 for (nBuffer = 0; nBuffer < m_nBuffers; nBuffer++)
3252                 {
3253                         // set the frame window header
3254                         UpdateHeaderPath(nBuffer);
3255
3256                         ForEachView(nBuffer, [](auto& pView) { pView->DocumentsLoaded(); });
3257
3258                         if ((m_nBufferType[nBuffer] == BUFFERTYPE::NORMAL) ||
3259                             (m_nBufferType[nBuffer] == BUFFERTYPE::NORMAL_NAMED))
3260                         {
3261                                 nNormalBuffer++;
3262                         }
3263
3264                 }
3265
3266                 // Inform user that files are identical
3267                 // Don't show message if new buffers created
3268                 if (identical == IDENTLEVEL::ALL && nNormalBuffer > 0)
3269                 {
3270                         ShowRescanError(nRescanResult, identical);
3271                 }
3272
3273                 // Exit if files are identical should only work for the first
3274                 // comparison and must be disabled afterward.
3275                 theApp.m_bExitIfNoDiff = MergeCmdLineInfo::Disabled;
3276         }
3277         else
3278         {
3279                 // CMergeDoc::Rescan fails if files do not exist on both sides
3280                 // or the really arcane case that the temp files couldn't be created,
3281                 // which is too obscure to bother reporting if you can't write to
3282                 // your temp directory, doing nothing is graceful enough for that).
3283                 ShowRescanError(nRescanResult, identical);
3284                 GetParentFrame()->DestroyWindow();
3285                 return false;
3286         }
3287
3288         // Force repaint of location pane to update it in case we had some warning
3289         // dialog visible and it got painted before files were loaded
3290         if (m_pView[0][0] != nullptr)
3291                 m_pView[0][0]->RepaintLocationPane();
3292
3293         return true;
3294 }
3295
3296 void CMergeDoc::MoveOnLoad(int nPane, int nLineIndex, bool bRealLine, int nCharIndex)
3297 {
3298         if (nPane < 0)
3299         {
3300                 nPane = GetOptionsMgr()->GetInt(OPT_ACTIVE_PANE);
3301                 if (nPane < 0 || nPane >= m_nBuffers)
3302                         nPane = 0;
3303         }
3304         if (nLineIndex == -1)
3305         {
3306                 // scroll to first diff
3307                 if (GetOptionsMgr()->GetBool(OPT_SCROLL_TO_FIRST) &&
3308                         m_diffList.HasSignificantDiffs())
3309                 {
3310                         int nDiff = m_diffList.FirstSignificantDiff();
3311                         if (nDiff != -1)
3312                                 m_pView[0][nPane]->SelectDiff(nDiff, true, false);
3313                         m_pView[0][nPane]->SetActivePane();
3314                         return;
3315                 }
3316         }
3317         m_pView[0][nPane]->GotoLine(nLineIndex < 0 ? 0 : nLineIndex, bRealLine, nPane, true, nCharIndex);
3318 }
3319
3320 void CMergeDoc::ChangeFile(int nBuffer, const String& path, int nLineIndex)
3321 {
3322         if (!PromptAndSaveIfNeeded(true))
3323                 return;
3324
3325         FileLocation fileloc[3];
3326         String strDesc[3];
3327         bool bRO[3];
3328         for (int pane = 0; pane < m_nBuffers; pane++)
3329         {
3330                 bRO[pane] = m_ptBuf[pane]->GetReadOnly();
3331                 fileloc[pane].encoding.m_unicoding = m_ptBuf[pane]->getUnicoding();
3332                 fileloc[pane].encoding.m_codepage = m_ptBuf[pane]->getCodepage();
3333                 fileloc[pane].setPath(m_filePaths[pane]);
3334         }
3335         std::copy_n(m_strDesc, m_nBuffers, strDesc);
3336
3337         strDesc[nBuffer] = _T("");
3338         fileloc[nBuffer].setPath(path);
3339         fileloc[nBuffer].encoding = codepage_detect::Guess(path, GetOptionsMgr()->GetInt(OPT_CP_DETECT));
3340
3341         if (OpenDocs(m_nBuffers, fileloc, bRO, strDesc))
3342                 MoveOnLoad(nBuffer, nLineIndex);
3343 }
3344
3345 /**
3346  * @brief Re-load a document.
3347  * This methods re-loads the file compare document. The re-loaded document is
3348  * one side of the file compare.
3349  * @param [in] index The document to re-load.
3350  * @return Open result code.
3351  */
3352 void CMergeDoc::RefreshOptions()
3353 {
3354         DIFFOPTIONS options = {0};
3355
3356         m_bAutomaticRescan = GetOptionsMgr()->GetBool(OPT_AUTOMATIC_RESCAN);
3357
3358         m_diffWrapper.SetDetectMovedBlocks(GetOptionsMgr()->GetBool(OPT_CMP_MOVED_BLOCKS));
3359         Options::DiffOptions::Load(GetOptionsMgr(), options);
3360
3361         m_diffWrapper.SetOptions(&options);
3362
3363         // Refresh view options
3364         ForEachView([](auto& pView) { pView->RefreshOptions(); });
3365 }
3366
3367 /**
3368  * @brief Write path and filename to headerbar
3369  * @note SetText() does not repaint unchanged text
3370  */
3371 void CMergeDoc::UpdateHeaderPath(int pane)
3372 {
3373         CMergeEditFrame *pf = GetParentFrame();
3374         ASSERT(pf != nullptr);
3375         String sText;
3376         bool bChanges = false;
3377
3378         if (m_nBufferType[pane] == BUFFERTYPE::UNNAMED ||
3379                 m_nBufferType[pane] == BUFFERTYPE::NORMAL_NAMED)
3380         {
3381                 sText = m_strDesc[pane];
3382         }
3383         else
3384         {
3385                 sText = m_filePaths[pane];
3386                 if (m_pDirDoc != nullptr)
3387                 {
3388                         m_pDirDoc->ApplyDisplayRoot(pane, sText);
3389                 }
3390         }
3391         bChanges = m_ptBuf[pane]->IsModified();
3392
3393         if (bChanges)
3394                 sText.insert(0, _T("* "));
3395
3396         if (m_sCurrentHeaderTitle[pane] == sText)
3397                 return;
3398
3399         m_sCurrentHeaderTitle[pane] = sText;
3400
3401         pf->GetHeaderInterface()->SetText(pane, sText);
3402
3403         SetTitle(nullptr);
3404 }
3405
3406 /**
3407  * @brief Paint differently the headerbar of the active view
3408  */
3409 void CMergeDoc::UpdateHeaderActivity(int pane, bool bActivate)
3410 {
3411         CMergeEditFrame *pf = GetParentFrame();
3412         ASSERT(pf != nullptr);
3413         pf->GetHeaderInterface()->SetActive(pane, bActivate);
3414 }
3415
3416 /**
3417  * @brief Set detect/not detect Moved Blocks
3418  */
3419 void CMergeDoc::SetDetectMovedBlocks(bool bDetectMovedBlocks)
3420 {
3421         if (bDetectMovedBlocks == m_diffWrapper.GetDetectMovedBlocks())
3422                 return;
3423
3424         GetOptionsMgr()->SaveOption(OPT_CMP_MOVED_BLOCKS, bDetectMovedBlocks);
3425         m_diffWrapper.SetDetectMovedBlocks(bDetectMovedBlocks);
3426         FlushAndRescan();
3427 }
3428
3429 /**
3430  * @brief Check if given buffer has mixed EOL style.
3431  * @param [in] nBuffer Buffer to check.
3432  * @return true if buffer's EOL style is mixed, false otherwise.
3433  */
3434 bool CMergeDoc::IsMixedEOL(int nBuffer) const
3435 {
3436         CDiffTextBuffer *pBuf = m_ptBuf[nBuffer].get();
3437         return pBuf->IsMixedEOL();
3438 }
3439
3440 void CMergeDoc::SetEditedAfterRescan(int nBuffer)
3441 {
3442         m_bEditAfterRescan[nBuffer] = true;
3443 }
3444
3445 bool CMergeDoc::IsEditedAfterRescan(int nBuffer) const
3446 {
3447         if (nBuffer >= 0 && nBuffer < m_nBuffers)
3448                 return m_bEditAfterRescan[nBuffer];
3449
3450         for (nBuffer = 0; nBuffer < m_nBuffers; ++nBuffer)
3451         {
3452                 if (m_bEditAfterRescan[nBuffer])
3453                         return true;
3454         }
3455
3456         return false;
3457 }
3458
3459 /**
3460  * @brief Update document filenames to title
3461  */
3462 void CMergeDoc::SetTitle(LPCTSTR lpszTitle)
3463 {
3464         PrediffingInfo infoPrediffer;
3465         GetPrediffer(&infoPrediffer);
3466         String sTitle = (lpszTitle != nullptr) ? lpszTitle : CMergeFrameCommon::GetTitleString(m_filePaths, m_strDesc, &m_infoUnpacker, &infoPrediffer);
3467         CDocument::SetTitle(sTitle.c_str());
3468 }
3469
3470 /**
3471  * @brief Update any resources necessary after a GUI language change
3472  */
3473 void CMergeDoc::UpdateResources()
3474 {
3475         if (m_nBufferType[0] == BUFFERTYPE::UNNAMED)
3476                 m_strDesc[0] = _("Untitled left");
3477         if (m_nBufferType[m_nBuffers - 1] == BUFFERTYPE::UNNAMED)
3478                 m_strDesc[m_nBuffers - 1] = _("Untitled right");
3479         if (m_nBuffers == 3 && m_nBufferType[1] == BUFFERTYPE::UNNAMED)
3480                 m_strDesc[1] = _("Untitled middle");
3481         for (int nBuffer = 0; nBuffer < m_nBuffers; nBuffer++)
3482                 UpdateHeaderPath(nBuffer);
3483
3484         GetParentFrame()->UpdateResources();
3485         ForEachView([](auto& pView) { pView->UpdateResources(); });
3486 }
3487
3488 // Return current word breaking break type setting (whitespace only or include punctuation)
3489 bool CMergeDoc::GetBreakType() const
3490 {
3491         bool breakType = !!GetOptionsMgr()->GetInt(OPT_BREAK_TYPE);
3492         return breakType;
3493 }
3494
3495 // Return true to do line diff colors at the byte level (false to do them at word level)
3496 bool CMergeDoc::GetByteColoringOption() const
3497 {
3498         // color at byte level if 'break_on_words' option not set
3499         bool breakWords = GetOptionsMgr()->GetBool(OPT_BREAK_ON_WORDS);
3500         return !breakWords;
3501 }
3502
3503 /// Swap files and update views
3504 void CMergeDoc::SwapFiles(int nFromIndex, int nToIndex)
3505 {
3506         if ((nFromIndex >= 0 && nFromIndex < m_nBuffers) && (nToIndex >= 0 && nToIndex < m_nBuffers))
3507         {
3508                 // Swap views
3509                 for (int nGroup = 0; nGroup < m_nGroups; ++nGroup)
3510                 {
3511                         int nLeftViewId = m_pView[nGroup][nFromIndex]->GetDlgCtrlID();
3512                         int nRightViewId = m_pView[nGroup][nToIndex]->GetDlgCtrlID();
3513                         m_pView[nGroup][nFromIndex]->SetDlgCtrlID(nRightViewId);
3514                         m_pView[nGroup][nToIndex]->SetDlgCtrlID(nLeftViewId);
3515                 }
3516
3517
3518                 // Swap buffers and so on
3519                 std::swap(m_ptBuf[nFromIndex], m_ptBuf[nToIndex]);
3520                 for (int nGroup = 0; nGroup < m_nGroups; ++nGroup)
3521                         std::swap(m_pView[nGroup][nFromIndex], m_pView[nGroup][nToIndex]);
3522                 std::swap(m_pSaveFileInfo[nFromIndex], m_pSaveFileInfo[nToIndex]);
3523                 std::swap(m_pRescanFileInfo[nFromIndex], m_pRescanFileInfo[nToIndex]);
3524                 std::swap(m_nBufferType[nFromIndex], m_nBufferType[nToIndex]);
3525                 std::swap(m_bEditAfterRescan[nFromIndex], m_bEditAfterRescan[nToIndex]);
3526                 std::swap(m_strDesc[nFromIndex], m_strDesc[nToIndex]);
3527
3528                 m_filePaths.Swap(nFromIndex, nToIndex);
3529                 m_diffList.Swap(nFromIndex, nToIndex);
3530                 for (int nGroup = 0; nGroup < m_nGroups; nGroup++)
3531                         swap(m_pView[nGroup][nFromIndex]->m_piMergeEditStatus, m_pView[nGroup][nToIndex]->m_piMergeEditStatus);
3532
3533                 ClearWordDiffCache();
3534
3535                 for (int nBuffer = 0; nBuffer < m_nBuffers; nBuffer++)
3536                 {
3537                         m_ptBuf[nBuffer]->m_nThisPane = nBuffer;
3538                         for (int nGroup = 0; nGroup < m_nGroups; nGroup++)
3539                                 m_pView[nGroup][nBuffer]->m_nThisPane = nBuffer;
3540
3541                         // Update views
3542                         UpdateHeaderPath(nBuffer);
3543                 }
3544                 GetParentFrame()->UpdateSplitter();
3545                 ForEachView([](auto& pView) { pView->UpdateStatusbar(); });
3546
3547                 UpdateAllViews(nullptr);
3548         }
3549 }
3550
3551 /**
3552  * @brief Reloads the opened files
3553  */
3554 void CMergeDoc::OnFileReload()
3555 {
3556         if (!PromptAndSaveIfNeeded(true))
3557                 return;
3558
3559         FileLocation fileloc[3];
3560         bool bRO[3];
3561         for (int pane = 0; pane < m_nBuffers; pane++)
3562         {
3563                 bRO[pane] = m_ptBuf[pane]->GetReadOnly();
3564                 fileloc[pane].encoding.m_unicoding = m_ptBuf[pane]->getUnicoding();
3565                 fileloc[pane].encoding.m_codepage = m_ptBuf[pane]->getCodepage();
3566                 fileloc[pane].setPath(m_filePaths[pane]);
3567         }
3568         CPoint pt = GetActiveMergeView()->GetCursorPos();
3569         if (OpenDocs(m_nBuffers, fileloc, bRO, m_strDesc))
3570                 MoveOnLoad(GetActiveMergeView()->m_nThisPane, pt.y);
3571 }
3572
3573 /**
3574  * @brief Display encodings to user
3575  */
3576 void CMergeDoc::OnFileEncoding()
3577 {
3578         DoFileEncodingDialog();
3579 }
3580
3581 void CMergeDoc::OnOpenWithUnpacker()
3582 {
3583         CSelectPluginDlg dlg(m_infoUnpacker.GetPluginPipeline(),
3584                 strutils::join(m_filePaths.begin(), m_filePaths.end(), _T("|")),
3585                 CSelectPluginDlg::PluginType::Unpacker, false);
3586         if (dlg.DoModal() != IDOK)
3587                 return;
3588
3589         if (!PromptAndSaveIfNeeded(true))
3590                 return;
3591
3592         PackingInfo infoUnpacker(dlg.GetPluginPipeline());
3593         PathContext paths = m_filePaths;
3594         DWORD dwFlags[3] = { FFILEOPEN_NOMRU, FFILEOPEN_NOMRU, FFILEOPEN_NOMRU };
3595         String strDesc[3] = { m_strDesc[0], m_strDesc[1], m_strDesc[2] };
3596         int nID = m_ptBuf[0]->GetTableEditing() ? ID_MERGE_COMPARE_TABLE : ID_MERGE_COMPARE_TEXT;
3597         nID = GetOptionsMgr()->GetBool(OPT_PLUGINS_OPEN_IN_SAME_FRAME_TYPE) ? nID : -1;
3598
3599         if (GetMainFrame()->DoFileOpen(nID, &paths, dwFlags, strDesc, _T(""), &infoUnpacker))
3600                 GetParentFrame()->DestroyWindow();
3601 }
3602
3603 void CMergeDoc::OnApplyPrediffer()
3604 {
3605         PrediffingInfo prediffer;
3606         GetPrediffer(&prediffer);
3607         // let the user choose a handler
3608         CSelectPluginDlg dlg(prediffer.GetPluginPipeline(),
3609                 strutils::join(m_filePaths.begin(), m_filePaths.end(), _T("|")),
3610                 CSelectPluginDlg::PluginType::Prediffer, false);
3611         if (dlg.DoModal() != IDOK)
3612                 return;
3613         prediffer.SetPluginPipeline(dlg.GetPluginPipeline());
3614         SetPrediffer(&prediffer);
3615         m_CurrentPredifferID = -1;
3616         FlushAndRescan(true);
3617         SetTitle(nullptr);
3618 }
3619
3620 /**
3621  * @brief Create the dynamic submenu for prediffers
3622  *
3623  * @note The plugins are grouped in (suggested) and (not suggested)
3624  *       The IDs follow the order of GetAvailableScripts
3625  *       For example :
3626  *                              suggested 0         ID_1ST + 0
3627  *                              suggested 1         ID_1ST + 2
3628  *                              suggested 2         ID_1ST + 5
3629  *                              not suggested 0     ID_1ST + 1
3630  *                              not suggested 1     ID_1ST + 3
3631  *                              not suggested 2     ID_1ST + 4
3632  */
3633 HMENU CMergeDoc::createPrediffersSubmenu(HMENU hMenu)
3634 {
3635         // empty the menu
3636         int j = GetMenuItemCount(hMenu);
3637         while (j --)
3638                 DeleteMenu(hMenu, 0, MF_BYPOSITION);
3639
3640         // title
3641         AppendMenu(hMenu, MF_STRING, ID_NO_PREDIFFER, _("No prediffer (normal)").c_str());
3642
3643         if (!GetOptionsMgr()->GetBool(OPT_PLUGINS_ENABLED))
3644                 return hMenu;
3645
3646         m_CurrentPredifferID = -1;
3647
3648         // compute the m_CurrentPredifferID (to set the radio button)
3649         PrediffingInfo prediffer;
3650         GetPrediffer(&prediffer);
3651         if (prediffer.GetPluginPipeline().empty())
3652                 m_CurrentPredifferID = ID_NO_PREDIFFER;
3653
3654         // get the scriptlet files
3655         const auto& [ suggestedPlugins, allPlugins ]= FileTransform::CreatePluginMenuInfos(
3656                 m_strBothFilenames, FileTransform::PredifferEventNames, ID_PREDIFFERS_FIRST);
3657
3658         // build the menu : first part, suggested plugins
3659         // title
3660         AppendMenu(hMenu, MF_SEPARATOR, 0, nullptr);
3661         AppendMenu(hMenu, MF_STRING, ID_SUGGESTED_PLUGINS, _("Suggested plugins").c_str());
3662
3663         for (const auto& [caption, name, id, plugin ] : suggestedPlugins)
3664                 AppendMenu(hMenu, MF_STRING, id, caption.c_str());
3665
3666         // build the menu : second part, others plugins
3667         // title
3668         AppendMenu(hMenu, MF_SEPARATOR, 0, nullptr);
3669         AppendMenu(hMenu, MF_STRING, ID_NOT_SUGGESTED_PLUGINS, _("Other plugins").c_str());
3670
3671         String lastPluginName;
3672         String errorMessage;
3673         auto result = prediffer.ParsePluginPipeline(errorMessage);
3674         if (result.size() > 0)
3675                 lastPluginName = result.back().name;
3676
3677         for (const auto& [processType, pluginAry] : allPlugins)
3678         {
3679                 for (const auto& [caption, name, id, plugin] : pluginAry)
3680                 {
3681                         if (!name.empty())
3682                         {
3683                                 AppendMenu(hMenu, MF_STRING, id, caption.c_str());
3684                                 if (lastPluginName == plugin->m_name)
3685                                         m_CurrentPredifferID = id;
3686                         }
3687                 }
3688         }
3689
3690         return hMenu;
3691 }
3692
3693 /**
3694  * @brief Called when an editor script item is updated
3695  */
3696 void CMergeDoc::OnUpdatePrediffer(CCmdUI* pCmdUI)
3697 {
3698         pCmdUI->Enable(true);
3699
3700         PrediffingInfo prediffer;
3701         GetPrediffer(&prediffer);
3702
3703         if (prediffer.GetPluginPipeline().find(_T("<Automatic>")) != String::npos)
3704         {
3705                 pCmdUI->SetRadio(false);
3706                 return;
3707         }
3708
3709         // Detect when CDiffWrapper::RunFileDiff has canceled a buggy prediffer
3710         if (prediffer.GetPluginPipeline().empty())
3711                 m_CurrentPredifferID = ID_NO_PREDIFFER;
3712
3713         pCmdUI->SetRadio(pCmdUI->m_nID == static_cast<UINT>(m_CurrentPredifferID));
3714 }
3715
3716 /**
3717  * @brief Handler for all prediffer choices, including ID_PREDIFF_MANUAL, ID_PREDIFF_AUTO, ID_NO_PREDIFFER, & specific prediffers
3718  */
3719 void CMergeDoc::OnPrediffer(UINT nID )
3720 {
3721         SetPredifferByMenu(nID);
3722         FlushAndRescan(true);
3723         SetTitle(nullptr);
3724 }
3725
3726 /**
3727  * @brief Handler for all prediffer choices.
3728  * Prediffer choises include ID_PREDIFF_MANUAL, ID_PREDIFF_AUTO,
3729  * ID_NO_PREDIFFER, & specific prediffers.
3730  */
3731 void CMergeDoc::SetPredifferByMenu(UINT nID)
3732 {
3733         // update data for the radio button
3734         m_CurrentPredifferID = nID;
3735
3736         if (nID == ID_NO_PREDIFFER)
3737         {
3738                 // All flags are set correctly during the construction
3739                 PrediffingInfo infoPrediffer(false);
3740                 SetPrediffer(&infoPrediffer);
3741                 return;
3742         }
3743
3744         String pluginName = CMainFrame::GetPluginPipelineByMenuId(nID, FileTransform::PredifferEventNames, ID_PREDIFFERS_FIRST);
3745
3746         // build a PrediffingInfo structure fom the ID
3747         PrediffingInfo prediffer(pluginName);
3748
3749         // update the prediffer and rescan
3750         SetPrediffer(&prediffer);
3751 }
3752
3753 void CMergeDoc::OnBnClickedFileEncoding()
3754 {
3755         if (m_pEncodingErrorBar == nullptr || m_pView[0][0] == nullptr)
3756                 return;
3757         m_pView[0][0]->GetParentFrame()->ShowControlBar(m_pEncodingErrorBar.get(), FALSE, FALSE);
3758         DoFileEncodingDialog();
3759 }
3760
3761 void CMergeDoc::OnBnClickedPlugin()
3762 {
3763         if (m_pEncodingErrorBar == nullptr || m_pView[0][0] == nullptr)
3764                 return;
3765         m_pView[0][0]->GetParentFrame()->ShowControlBar(m_pEncodingErrorBar.get(), FALSE, FALSE);
3766         OnOpenWithUnpacker();
3767 }
3768
3769 void CMergeDoc::OnBnClickedHexView()
3770 {
3771         OnFileRecompareAs(ID_MERGE_COMPARE_HEX);
3772 }
3773
3774 void CMergeDoc::OnOK()
3775 {
3776         if (m_pEncodingErrorBar == nullptr || m_pView[0][0] == nullptr)
3777                 return;
3778         m_pView[0][0]->GetParentFrame()->ShowControlBar(m_pEncodingErrorBar.get(), FALSE, FALSE);
3779 }
3780
3781 void CMergeDoc::OnFileRecompareAsText()
3782 {
3783         m_bEnableTableEditing = false;
3784         OnFileReload();
3785 }
3786
3787 void CMergeDoc::OnUpdateFileRecompareAsText(CCmdUI *pCmdUI)
3788 {
3789         pCmdUI->Enable(m_ptBuf[0]->GetTableEditing());
3790 }
3791
3792 void CMergeDoc::OnFileRecompareAsTable()
3793 {
3794         m_bEnableTableEditing = true;
3795         OnFileReload();
3796 }
3797
3798 void CMergeDoc::OnUpdateFileRecompareAsTable(CCmdUI *pCmdUI)
3799 {
3800         pCmdUI->Enable(!m_ptBuf[0]->GetTableEditing());
3801 }
3802
3803 void CMergeDoc::OnFileRecompareAs(UINT nID)
3804 {
3805         if (!PromptAndSaveIfNeeded(true))
3806                 return;
3807
3808         DWORD dwFlags[3] = { 0 };
3809         FileLocation fileloc[3];
3810         String strDesc[3];
3811         int nBuffers = m_nBuffers;
3812         CDirDoc *pDirDoc = m_pDirDoc->GetMainView() ? m_pDirDoc :
3813                 static_cast<CDirDoc*>(theApp.m_pDirTemplate->CreateNewDocument());
3814         PackingInfo infoUnpacker(m_infoUnpacker.GetPluginPipeline());
3815
3816         for (int pane = 0; pane < m_nBuffers; pane++)
3817         {
3818                 fileloc[pane].setPath(m_filePaths[pane]);
3819                 dwFlags[pane] |= FFILEOPEN_NOMRU | (m_ptBuf[pane]->GetReadOnly() ? FFILEOPEN_READONLY : 0);
3820                 strDesc[pane] = m_strDesc[pane];
3821         }
3822         if (ID_UNPACKERS_FIRST <= nID && nID <= ID_UNPACKERS_LAST)
3823         {
3824                 infoUnpacker.SetPluginPipeline(CMainFrame::GetPluginPipelineByMenuId(nID, FileTransform::UnpackerEventNames, ID_UNPACKERS_FIRST));
3825                 nID = m_ptBuf[0]->GetTableEditing() ? ID_MERGE_COMPARE_TABLE : ID_MERGE_COMPARE_TEXT;
3826                 nID = GetOptionsMgr()->GetBool(OPT_PLUGINS_OPEN_IN_SAME_FRAME_TYPE) ? nID : -1;
3827         }
3828
3829         if (GetMainFrame()->ShowMergeDoc(nID, pDirDoc, nBuffers, fileloc, dwFlags, strDesc, _T(""), &infoUnpacker))
3830                 GetParentFrame()->DestroyWindow();
3831 }
3832
3833 // Return file extension either from file name
3834 String CMergeDoc::GetFileExt(LPCTSTR sFileName, LPCTSTR sDescription) const
3835 {
3836         String sExt;
3837         paths::SplitFilename(sFileName, nullptr, nullptr, &sExt);
3838         return sExt;
3839 }
3840
3841 /**
3842  * @brief Generate report from file compare results.
3843  */
3844 bool CMergeDoc::GenerateReport(const String& sFileName) const
3845 {
3846         // calculate HTML font size
3847         LOGFONT lf;
3848         CDC dc;
3849         dc.CreateDC(_T("DISPLAY"), nullptr, nullptr, nullptr);
3850         m_pView[0][0]->GetFont(lf);
3851         int nFontSize = -MulDiv (lf.lfHeight, 72, dc.GetDeviceCaps (LOGPIXELSY));
3852
3853         // create HTML report
3854         UniStdioFile file;
3855         if (!file.Open(sFileName, _T("wt")))
3856         {
3857                 String errMsg = GetSysError(GetLastError());
3858                 String msg = strutils::format_string1(
3859                         _("Error creating the report:\n%1"), errMsg);
3860                 AfxMessageBox(msg.c_str(), MB_OK | MB_ICONSTOP);
3861                 return false;
3862         }
3863
3864         file.SetCodepage(ucr::CP_UTF_8);
3865
3866         CString headerText =
3867                 _T("<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01 Transitional//EN\"\n")
3868                 _T("\t\"http://www.w3.org/TR/html4/loose.dtd\">\n")
3869                 _T("<html>\n")
3870                 _T("<head>\n")
3871                 _T("<meta http-equiv=\"Content-Type\" content=\"text/html; charset=UTF-8\">\n")
3872                 _T("<title>WinMerge File Compare Report</title>\n")
3873                 _T("<style type=\"text/css\">\n")
3874                 _T("<!--\n")
3875                 _T("table {margin: 0; border: 1px solid #a0a0a0; box-shadow: 1px 1px 2px rgba(0, 0, 0, 0.15);}\n")
3876                 _T("td,th {word-break: break-all; font-size: %dpt;padding: 0 3px;}\n")
3877                 _T("tr { vertical-align: top; }\n")
3878                 _T(".title {color: white; background-color: blue; vertical-align: top; padding: 4px 4px; background: linear-gradient(mediumblue, darkblue);}\n")
3879                 _T("%s")
3880                 _T("-->\n")
3881                 _T("</style>\n")
3882                 _T("</head>\n")
3883                 _T("<body>\n")
3884                 _T("<table cellspacing=\"0\" cellpadding=\"0\" style=\"width:100%%;\">\n")
3885                 _T("<thead>\n")
3886                 _T("<tr>\n");
3887         String header =
3888                 strutils::format((LPCTSTR)headerText, nFontSize, (LPCTSTR)m_pView[0][0]->GetHTMLStyles());
3889         file.WriteString(header);
3890
3891         // Get paths
3892         // If archive, use archive path + folder + filename inside archive
3893         // If desc text given, use it
3894         PathContext paths = m_filePaths;
3895         if (m_pDirDoc != nullptr && m_pDirDoc->IsArchiveFolders())
3896         {
3897                 for (int i = 0; i < paths.GetSize(); i++)
3898                         m_pDirDoc->ApplyDisplayRoot(i, paths[i]);
3899         }
3900         else
3901         {
3902                 for (int i = 0; i < paths.GetSize(); i++)
3903                 {
3904                         if (!m_strDesc[i].empty())
3905                                 paths[i] = m_strDesc[i];
3906                 }
3907         }
3908
3909         // titles
3910         int nBuffer;
3911         for (nBuffer = 0; nBuffer < m_nBuffers; nBuffer++)
3912         {
3913                 String data = strutils::format(_T("<th colspan=\"2\" class=\"title\" style=\"width:%f%%\">"),
3914                         (double)100 / m_nBuffers);
3915                 file.WriteString(data);
3916                 file.WriteString(ucr::toTString(CMarkdown::Entities(ucr::toUTF8(paths[nBuffer]))));
3917                 file.WriteString(_T("</th>\n"));
3918         }
3919         file.WriteString(
3920                 _T("</tr>\n")
3921                 _T("</thead>\n")
3922                 _T("<tbody>\n"));
3923
3924         // write the body of the report
3925         int idx[3] = {0};
3926         int nLineCount[3] = {0};
3927         int nDiff = 0;
3928         for (nBuffer = 0; nBuffer < m_nBuffers; nBuffer++)
3929                 nLineCount[nBuffer] = m_ptBuf[nBuffer]->GetLineCount();
3930
3931         for (;;)
3932         {
3933                 file.WriteString(_T("<tr>\n"));
3934                 for (nBuffer = 0; nBuffer < m_nBuffers; nBuffer++)
3935                 {
3936                         for (; idx[nBuffer] < nLineCount[nBuffer]; idx[nBuffer]++)
3937                         {
3938                                 if (m_pView[0][nBuffer]->GetLineVisible(idx[nBuffer]))
3939                                         break;
3940                         }
3941
3942                         if (idx[nBuffer] < nLineCount[nBuffer])
3943                         {
3944                                 // line number
3945                                 int iVisibleLineNumber = 0;
3946                                 String tdtag = _T("<td class=\"ln\">");
3947                                 DWORD dwFlags = m_ptBuf[nBuffer]->GetLineFlags(idx[nBuffer]);
3948                                 if ((dwFlags & LF_GHOST) == 0 && m_pView[0][nBuffer]->GetViewLineNumbers())
3949                                 {
3950                                         iVisibleLineNumber = m_ptBuf[nBuffer]->ComputeRealLine(idx[nBuffer]) + 1;
3951                                 }
3952                                 if (nBuffer == 0 &&
3953                                         (dwFlags & (LF_DIFF | LF_GHOST)) != 0 && (idx[nBuffer] == 0 ||
3954                                         (m_ptBuf[nBuffer]->GetLineFlags(idx[nBuffer] - 1) & (LF_DIFF | LF_GHOST)) == 0))
3955                                 {
3956                                         ++nDiff;
3957                                         if (iVisibleLineNumber > 0)
3958                                         {
3959                                                 tdtag += strutils::format(_T("<a name=\"d%d\" href=\"#d%d\">%d</a>"), nDiff, nDiff, iVisibleLineNumber);
3960                                                 iVisibleLineNumber = 0;
3961                                         }
3962                                         else
3963                                                 tdtag += strutils::format(_T("<a name=\"d%d\" href=\"#d%d\">.</a>"), nDiff, nDiff);
3964                                 }
3965                                 if (iVisibleLineNumber > 0)
3966                                         tdtag += strutils::format(_T("%d</td>"), iVisibleLineNumber);
3967                                 else
3968                                         tdtag += _T("</td>");
3969                                 file.WriteString(tdtag);
3970                                 // line content
3971                                 file.WriteString((LPCTSTR)m_pView[0][nBuffer]->GetHTMLLine(idx[nBuffer], _T("td")));
3972                                 idx[nBuffer]++;
3973                         }
3974                         else
3975                                 file.WriteString(_T("<td class=\"ln\"></td><td></td>"));
3976                         file.WriteString(_T("\n"));
3977                 }
3978                 file.WriteString(_T("</tr>\n"));
3979
3980                 bool bBorderLine = false;
3981                 for (nBuffer = 0; nBuffer < m_nBuffers; nBuffer++)
3982                 {
3983                         if (idx[nBuffer] < nLineCount[nBuffer] && !m_pView[0][nBuffer]->GetLineVisible(idx[nBuffer]))
3984                                 bBorderLine = true;
3985                 }
3986
3987                 if (bBorderLine)
3988                 {
3989                         file.WriteString(_T("<tr height=1>"));
3990                         for (nBuffer = 0; nBuffer < m_nBuffers; nBuffer++)
3991                         {
3992                                 if (idx[nBuffer] < nLineCount[nBuffer] && !m_pView[0][nBuffer]->GetLineVisible(idx[nBuffer]))
3993                                         file.WriteString(_T("<td style=\"background-color: black\"></td><td style=\"background-color: black\"></td>"));
3994                                 else
3995                                         file.WriteString(_T("<td></td><td></td>"));
3996                         }
3997                         file.WriteString(_T("</tr>\n"));
3998                 }
3999
4000                 if (idx[0] >= nLineCount[0] && idx[1] >= nLineCount[1] && (m_nBuffers < 3 || idx[2] >= nLineCount[2]))
4001                         break;
4002         }
4003         file.WriteString(
4004                 _T("</tbody>\n")
4005                 _T("</table>\n")
4006                 _T("</body>\n")
4007                 _T("</html>\n"));
4008
4009         file.Close();
4010
4011         return true;
4012 }
4013
4014 /**
4015  * @brief Generate report from file compare results.
4016  */
4017 void CMergeDoc::OnToolsGenerateReport()
4018 {
4019         String s;
4020         CString folder;
4021
4022         if (!SelectFile(AfxGetMainWnd()->GetSafeHwnd(), s, false, folder, _T(""), _("HTML Files (*.htm,*.html)|*.htm;*.html|All Files (*.*)|*.*||"), _T("htm")))
4023                 return;
4024
4025         if (GenerateReport(s.c_str()))
4026                 LangMessageBox(IDS_REPORT_SUCCESS, MB_OK | MB_ICONINFORMATION);
4027 }
4028
4029 /**
4030  * @brief Generate patch from files selected.
4031  *
4032  * Creates a patch from selected files in active directory compare, or
4033  * active file compare. Files in file compare must be saved before
4034  * creating a patch.
4035  */
4036 void CMergeDoc::OnToolsGeneratePatch()
4037 {
4038         // If there are changes in files, tell user to save them first
4039         if (IsModified())
4040         {
4041                 LangMessageBox(IDS_SAVEFILES_FORPATCH, MB_ICONSTOP);
4042                 return;
4043         }
4044
4045         CPatchTool patcher;
4046         patcher.AddFiles(m_filePaths.GetLeft(),
4047                         m_filePaths.GetRight());
4048         patcher.CreatePatch();
4049 }
4050
4051 /**
4052  * @brief Add synchronization point
4053  */
4054 void CMergeDoc::AddSyncPoint()
4055 {
4056         int nLine[3];
4057         for (int nBuffer = 0; nBuffer < m_nBuffers; ++nBuffer)
4058         {
4059                 int tmp = m_pView[0][nBuffer]->GetCursorPos().y;
4060                 nLine[nBuffer] = m_ptBuf[nBuffer]->ComputeApparentLine(m_ptBuf[nBuffer]->ComputeRealLine(tmp));
4061         }
4062
4063         // If adding a sync point by selecting a ghost line that is after the last block, Cancel the process adding a sync point.
4064         for (int nBuffer = 0; nBuffer < m_nBuffers; ++nBuffer)
4065                 if (nLine[nBuffer] >= m_ptBuf[nBuffer]->GetLineCount())
4066                 {
4067                         LangMessageBox(IDS_SYNCPOINT_LASTBLOCK, MB_ICONSTOP);
4068                         return;
4069                 }
4070
4071         for (int nBuffer = 0; nBuffer < m_nBuffers; ++nBuffer)
4072                 if (m_ptBuf[nBuffer]->GetLineFlags(nLine[nBuffer]) & LF_INVALID_BREAKPOINT)
4073                         DeleteSyncPoint(nBuffer, nLine[nBuffer], false);
4074
4075         for (int nBuffer = 0; nBuffer < m_nBuffers; ++nBuffer)
4076                 m_ptBuf[nBuffer]->SetLineFlag(nLine[nBuffer], LF_INVALID_BREAKPOINT, true, false);
4077
4078         m_bHasSyncPoints = true;
4079
4080         ForEachView([](auto& pView) { pView->SetSelectionMargin(true); });
4081
4082         FlushAndRescan(true);
4083 }
4084
4085 /**
4086  * @brief Delete a synchronization point
4087  */
4088 bool CMergeDoc::DeleteSyncPoint(int pane, int nLine, bool bRescan)
4089 {
4090         const auto syncpoints = GetSyncPointList();
4091         for (auto syncpnt : syncpoints)
4092         {
4093                 if (syncpnt[pane] == nLine)
4094                 {
4095                         for (int nBuffer = 0; nBuffer < m_nBuffers; ++nBuffer)
4096                                 m_ptBuf[nBuffer]->SetLineFlag(syncpnt[nBuffer], LF_INVALID_BREAKPOINT, false, false);
4097                 }
4098         }
4099
4100         if (syncpoints.size() == 1)
4101                 m_bHasSyncPoints = false;
4102
4103         if (bRescan)
4104                 FlushAndRescan(true);
4105         return true;
4106 }
4107
4108 /**
4109  * @brief Clear Synchronization points
4110  */
4111 void CMergeDoc::ClearSyncPoints()
4112 {
4113         if (!m_bHasSyncPoints)
4114                 return;
4115
4116         for (int nBuffer = 0; nBuffer < m_nBuffers; ++nBuffer)
4117         {
4118                 int nLineCount = m_ptBuf[nBuffer]->GetLineCount();
4119                 for (int nLine = 0; nLine < nLineCount; ++nLine)
4120                 {
4121                         if (m_ptBuf[nBuffer]->GetLineFlags(nLine) & LF_INVALID_BREAKPOINT)
4122                                 m_ptBuf[nBuffer]->SetLineFlag(nLine, LF_INVALID_BREAKPOINT, false, false);
4123                 }
4124         }
4125
4126         m_bHasSyncPoints = false;
4127
4128         FlushAndRescan(true);
4129 }
4130
4131 std::vector<std::vector<int> > CMergeDoc::GetSyncPointList()
4132 {
4133         std::vector<std::vector<int> > list;
4134         if (!m_bHasSyncPoints)
4135                 return list;
4136         int idx[3] = {-1, -1, -1};
4137         std::vector<int> points(m_nBuffers);
4138         for (int nBuffer = 0; nBuffer < m_nBuffers; ++nBuffer)
4139                 points[nBuffer] = m_ptBuf[nBuffer]->GetLineCount() - 1;
4140         for (int nBuffer = 0; nBuffer < m_nBuffers; ++nBuffer)
4141         {
4142                 int nLineCount = m_ptBuf[nBuffer]->GetLineCount();
4143                 for (int nLine = 0; nLine < nLineCount; ++nLine)
4144                 {
4145                         if (m_ptBuf[nBuffer]->GetLineFlags(nLine) & LF_INVALID_BREAKPOINT)
4146                         {
4147                                 idx[nBuffer]++;
4148                                 if (static_cast<int>(list.size()) <= idx[nBuffer])
4149                                         list.push_back(points);
4150                                 list[idx[nBuffer]][nBuffer] = nLine;
4151                         }
4152                 }
4153         }
4154         return list;
4155 }
4156