From 770b42c737c9054b88495fdd0f454219eb73c4c8 Mon Sep 17 00:00:00 2001
From: Takashi Sawanaka <sdottaka@users.sourceforge.net>
Date: Thu, 22 Jul 2021 15:20:54 +0900
Subject: [PATCH] Add /new command line option

---
 Docs/Manual/EN/Command_line.xml |  9 +++++
 Docs/Manual/JP/Command_line.xml |  9 +++++
 Docs/Users/ChangeLog.html       |  2 +-
 Docs/Users/ChangeLog.md         |  2 +-
 Docs/Users/ReleaseNotes.html    |  2 +-
 Docs/Users/ReleaseNotes.md      |  2 +-
 Src/DirView.cpp                 |  6 ++--
 Src/MainFrm.cpp                 | 75 +++++++++++++++++++++--------------------
 Src/MainFrm.h                   | 25 +++++++++-----
 Src/Merge.cpp                   | 24 ++++++++-----
 Src/MergeCmdLineInfo.cpp        |  6 ++++
 Src/MergeCmdLineInfo.h          |  1 +
 Src/OpenView.cpp                |  6 ++--
 13 files changed, 107 insertions(+), 62 deletions(-)

diff --git a/Docs/Manual/EN/Command_line.xml b/Docs/Manual/EN/Command_line.xml
index cd0a63e59..36ce1ac87 100644
--- a/Docs/Manual/EN/Command_line.xml
+++ b/Docs/Manual/EN/Command_line.xml
@@ -61,6 +61,8 @@
 
       <arg choice="opt" rep="norepeat"><option>/wr</option></arg>
 
+      <arg choice="opt" rep="norepeat"><option>/new</option></arg>
+
       <arg choice="opt" rep="norepeat"><option>/self-compare</option></arg>
 
       <arg><option>/minimize</option></arg>
@@ -366,6 +368,13 @@
     </varlistentry>
 
     <varlistentry>
+      <term><option>/new</option></term>
+      <listitem>
+        <para>Opens a new blank window.</para>
+      </listitem>
+    </varlistentry>
+
+    <varlistentry>
       <term><option>/self-compare</option></term>
       <listitem>
         <para>Compares the specified file with a copy of the file.</para>
diff --git a/Docs/Manual/JP/Command_line.xml b/Docs/Manual/JP/Command_line.xml
index ba8398c05..3101c2031 100644
--- a/Docs/Manual/JP/Command_line.xml
+++ b/Docs/Manual/JP/Command_line.xml
@@ -61,6 +61,8 @@
 
       <arg choice="opt" rep="norepeat"><option>/wr</option></arg>
 
+      <arg choice="opt" rep="norepeat"><option>/new</option></arg>
+
       <arg choice="opt" rep="norepeat"><option>/self-compare</option></arg>
 
       <arg><option>/minimize</option></arg>
@@ -365,6 +367,13 @@
     </varlistentry>
 
     <varlistentry>
+      <term><option>/new</option></term>
+      <listitem>
+        <para>新規ブランクウインドウを開きます。</para>
+      </listitem>
+    </varlistentry>
+
+    <varlistentry>
       <term><option>/self-compare</option></term>
       <listitem>
         <para>指定された１つのファイルとそのファイルのコピーを比較します。</para>
diff --git a/Docs/Users/ChangeLog.html b/Docs/Users/ChangeLog.html
index 4ff6f9328..008f1a097 100644
--- a/Docs/Users/ChangeLog.html
+++ b/Docs/Users/ChangeLog.html
@@ -91,7 +91,7 @@
 <h3 id="command-line">Command line</h3>
 <ul>
 <li>Added /l command line option (osdn.net #41528)</li>
-<li>Added /t, /table-delimiter and /inifile command line option</li>
+<li>Added /t, /table-delimiter, /new and /inifile command line option</li>
 </ul>
 <h3 id="installer">Installer</h3>
 <ul>
diff --git a/Docs/Users/ChangeLog.md b/Docs/Users/ChangeLog.md
index b4e0643c3..3f5402135 100644
--- a/Docs/Users/ChangeLog.md
+++ b/Docs/Users/ChangeLog.md
@@ -72,7 +72,7 @@
 ### Command line
 
 - Added /l command line option (osdn.net #41528)
-- Added /t, /table-delimiter and /inifile command line option
+- Added /t, /table-delimiter, /new and /inifile command line option
 
 ### Installer
 
diff --git a/Docs/Users/ReleaseNotes.html b/Docs/Users/ReleaseNotes.html
index cc9d513fb..add7fb2ca 100644
--- a/Docs/Users/ReleaseNotes.html
+++ b/Docs/Users/ReleaseNotes.html
@@ -101,7 +101,7 @@
 <h3 id="command-line">Command line</h3>
 <ul>
 <li>Added /l command line option (osdn.net #41528)</li>
-<li>Added /t, /table-delimiter and /inifile command line option</li>
+<li>Added /t, /table-delimiter, /new and /inifile command line option</li>
 </ul>
 <h3 id="installer">Installer</h3>
 <ul>
diff --git a/Docs/Users/ReleaseNotes.md b/Docs/Users/ReleaseNotes.md
index 64d9ff34e..a1a81556f 100644
--- a/Docs/Users/ReleaseNotes.md
+++ b/Docs/Users/ReleaseNotes.md
@@ -86,7 +86,7 @@ Please submit bug reports to our <a href="http://github.com/winmerge/winmerge/is
 ### Command line
 
 - Added /l command line option (osdn.net #41528)
-- Added /t, /table-delimiter and /inifile command line option
+- Added /t, /table-delimiter, /new and /inifile command line option
 
 ### Installer
 
diff --git a/Src/DirView.cpp b/Src/DirView.cpp
index 20990b5e1..62362e2b9 100644
--- a/Src/DirView.cpp
+++ b/Src/DirView.cpp
@@ -1259,7 +1259,7 @@ void CDirView::OpenParentDirectory(CDirDoc *pDocOpen)
 		DWORD dwFlags[3];
 		for (int nIndex = 0; nIndex < pathsParent.GetSize(); ++nIndex)
 			dwFlags[nIndex] = FFILEOPEN_NOMRU | (pDoc->GetReadOnly(nIndex) ? FFILEOPEN_READONLY : 0);
-		GetMainFrame()->DoFileOpen(&pathsParent, dwFlags, nullptr, _T(""), GetDiffContext().m_bRecursive, (GetAsyncKeyState(VK_CONTROL) & 0x8000) ? nullptr : pDocOpen);
+		GetMainFrame()->DoFileOrFolderOpen(&pathsParent, dwFlags, nullptr, _T(""), GetDiffContext().m_bRecursive, (GetAsyncKeyState(VK_CONTROL) & 0x8000) ? nullptr : pDocOpen);
 		[[fallthrough]];
 	case AllowUpwardDirectory::No:
 		break;
@@ -1352,12 +1352,12 @@ void CDirView::Open(CDirDoc *pDoc, const PathContext& paths, DWORD dwFlags[3], F
 	{
 		// Open subfolders
 		// Don't add folders to MRU
-		GetMainFrame()->DoFileOpen(&paths, dwFlags, nullptr, _T(""), GetDiffContext().m_bRecursive, (GetAsyncKeyState(VK_CONTROL) & 0x8000) ? nullptr : pDoc);
+		GetMainFrame()->DoFileOrFolderOpen(&paths, dwFlags, nullptr, _T(""), GetDiffContext().m_bRecursive, (GetAsyncKeyState(VK_CONTROL) & 0x8000) ? nullptr : pDoc);
 	}
 	else if (HasZipSupport() && std::count_if(paths.begin(), paths.end(), ArchiveGuessFormat) == paths.GetSize())
 	{
 		// Open archives, not adding paths to MRU
-		GetMainFrame()->DoFileOpen(&paths, dwFlags, nullptr, _T(""), GetDiffContext().m_bRecursive, nullptr, infoUnpacker, nullptr);
+		GetMainFrame()->DoFileOrFolderOpen(&paths, dwFlags, nullptr, _T(""), GetDiffContext().m_bRecursive, nullptr, infoUnpacker, nullptr);
 	}
 	else
 	{
diff --git a/Src/MainFrm.cpp b/Src/MainFrm.cpp
index e885d6078..e917b2fe8 100644
--- a/Src/MainFrm.cpp
+++ b/Src/MainFrm.cpp
@@ -200,14 +200,14 @@ BEGIN_MESSAGE_MAP(CMainFrame, CMDIFrameWnd)
 	ON_UPDATE_COMMAND_UI(ID_RELOAD_PLUGINS, OnUpdatePluginRelatedMenu)
 	ON_COMMAND(ID_RELOAD_PLUGINS, OnReloadPlugins)
 	ON_COMMAND(ID_HELP_GETCONFIG, OnSaveConfigData)
-	ON_COMMAND(ID_FILE_NEW, (OnFileNew<2, FRAME_FILE>))
-	ON_COMMAND(ID_FILE_NEW_TABLE, (OnFileNew<2, FRAME_FILE, true>))
-	ON_COMMAND(ID_FILE_NEW_HEX, (OnFileNew<2, FRAME_HEXFILE>))
-	ON_COMMAND(ID_FILE_NEW_IMAGE, (OnFileNew<2, FRAME_IMGFILE>))
-	ON_COMMAND(ID_FILE_NEW3, (OnFileNew<3, FRAME_FILE>))
-	ON_COMMAND(ID_FILE_NEW3_TABLE, (OnFileNew<2, FRAME_FILE, true>))
-	ON_COMMAND(ID_FILE_NEW3_HEX, (OnFileNew<3, FRAME_HEXFILE>))
-	ON_COMMAND(ID_FILE_NEW3_IMAGE, (OnFileNew<3, FRAME_IMGFILE>))
+	ON_COMMAND(ID_FILE_NEW, (OnFileNew<2, ID_MERGE_COMPARE_TEXT>))
+	ON_COMMAND(ID_FILE_NEW_TABLE, (OnFileNew<2, ID_MERGE_COMPARE_TABLE>))
+	ON_COMMAND(ID_FILE_NEW_HEX, (OnFileNew<2, ID_MERGE_COMPARE_HEX>))
+	ON_COMMAND(ID_FILE_NEW_IMAGE, (OnFileNew<2, ID_MERGE_COMPARE_IMAGE>))
+	ON_COMMAND(ID_FILE_NEW3, (OnFileNew<3, ID_MERGE_COMPARE_TEXT>))
+	ON_COMMAND(ID_FILE_NEW3_TABLE, (OnFileNew<2, ID_MERGE_COMPARE_TABLE>))
+	ON_COMMAND(ID_FILE_NEW3_HEX, (OnFileNew<3, ID_MERGE_COMPARE_HEX>))
+	ON_COMMAND(ID_FILE_NEW3_IMAGE, (OnFileNew<3, ID_MERGE_COMPARE_IMAGE>))
 	ON_COMMAND(ID_TOOLS_FILTERS, OnToolsFilters)
 	ON_COMMAND(ID_VIEW_STATUS_BAR, OnViewStatusBar)
 	ON_UPDATE_COMMAND_UI(ID_VIEW_TAB_BAR, OnUpdateViewTabBar)
@@ -680,7 +680,7 @@ void CMainFrame::OnInitMenuPopup(CMenu* pPopupMenu, UINT nIndex, BOOL bSysMenu)
 
 void CMainFrame::OnFileOpen() 
 {
-	DoFileOpen();
+	DoFileOrFolderOpen();
 }
 
 /**
@@ -1071,7 +1071,7 @@ static bool AddToRecentDocs(const PathContext& paths, const unsigned flags[], bo
  * @param [in] infoPrediffer Prediffer plugin name.
  * @return `true` if opening files and compare succeeded, `false` otherwise.
  */
-bool CMainFrame::DoFileOpen(const PathContext * pFiles /*= nullptr*/,
+bool CMainFrame::DoFileOrFolderOpen(const PathContext * pFiles /*= nullptr*/,
 	const DWORD dwFlags[] /*= nullptr*/, const String strDesc[] /*= nullptr*/, const String& sReportFile /*= T("")*/,
 	bool bRecurse /*= false*/, CDirDoc* pDirDoc/*= nullptr*/,
 	const PackingInfo *infoUnpacker /*= nullptr*/, const PrediffingInfo *infoPrediffer /*= nullptr*/,
@@ -1217,12 +1217,16 @@ bool CMainFrame::DoFileOpen(const PathContext * pFiles /*= nullptr*/,
 
 bool CMainFrame::DoFileOpen(UINT nID, const PathContext* pFiles /*= nullptr*/,
 	const DWORD dwFlags[] /*= nullptr*/, const String strDesc[] /*= nullptr*/,
-	const String& sReportFile /*= _T("")*/, const PackingInfo *infoUnpacker /*= nullptr*/, OpenTextFileParams *pOpenParams /*= nullptr*/)
+	const String& sReportFile /*= _T("")*/,
+	const PackingInfo *infoUnpacker /*= nullptr*/, const PrediffingInfo *infoPrediffer /*= nullptr*/,
+	OpenTextFileParams *pOpenParams /*= nullptr*/)
 {
 	CDirDoc* pDirDoc = static_cast<CDirDoc*>(theApp.m_pDirTemplate->CreateNewDocument());
 	FileLocation fileloc[3];
 	for (int pane = 0; pane < pFiles->GetSize(); pane++)
 		fileloc[pane].setPath((*pFiles)[pane]);
+	if (infoPrediffer && !infoPrediffer->GetPluginPipeline().empty())
+		pDirDoc->GetPluginManager().SetPrediffer(_T("|"), infoPrediffer->GetPluginPipeline());
 	return ShowMergeDoc(nID, pDirDoc, pFiles->GetSize(), fileloc,
 		dwFlags, strDesc, sReportFile, infoUnpacker, pOpenParams);
 }
@@ -1579,7 +1583,7 @@ void CMainFrame::OnDropFiles(const std::vector<String>& dropped_files)
 		}
 	}
 
-	DoFileOpen(&tFiles, dwFlags, nullptr, _T(""), recurse);
+	DoFileOrFolderOpen(&tFiles, dwFlags, nullptr, _T(""), recurse);
 }
 
 void CMainFrame::OnPluginUnpackMode(UINT nID )
@@ -1735,39 +1739,37 @@ void CMainFrame::OnSaveConfigData()
  * @sa CMergeDoc::OpenDocs()
  * @sa CMergeDoc::TrySaveAs()
  */
-void CMainFrame::FileNew(int nPanes, FRAMETYPE frameType, bool table) 
+bool CMainFrame::DoFileNew(UINT nID, int nPanes, const String strDesc[],
+	const PrediffingInfo *infoPrediffer /*= nullptr*/,
+	OpenTextFileParams *pOpenParams)
 {
 	CDirDoc *pDirDoc = static_cast<CDirDoc*>(theApp.m_pDirTemplate->CreateNewDocument());
 	
 	// Load emptyfile descriptors and open empty docs
 	// Use default codepage
 	DWORD dwFlags[3] = {0, 0, 0};
-	String strDesc[3];
 	FileLocation fileloc[3];
+	String strDesc2[3];
 	if (nPanes == 2)
 	{
-		strDesc[0] = _("Untitled left");
-		strDesc[1] = _("Untitled right");
-		fileloc[0].encoding.SetCodepage(ucr::getDefaultCodepage());
-		fileloc[1].encoding.SetCodepage(ucr::getDefaultCodepage());
+		strDesc2[0] = _("Untitled left");
+		strDesc2[1] = _("Untitled right");
 	}
 	else
 	{
-		strDesc[0] = _("Untitled left");
-		strDesc[1] = _("Untitled middle");
-		strDesc[2] = _("Untitled right");
-		fileloc[0].encoding.SetCodepage(ucr::getDefaultCodepage());
-		fileloc[1].encoding.SetCodepage(ucr::getDefaultCodepage());
-		fileloc[2].encoding.SetCodepage(ucr::getDefaultCodepage());
+		strDesc2[0] = _("Untitled left");
+		strDesc2[1] = _("Untitled middle");
+		strDesc2[2] = _("Untitled right");
 	}
-	UINT nID = ID_MERGE_COMPARE_TEXT;
-	switch (frameType)
+	for (int i = 0; i < nPanes; ++i)
 	{
-	case FRAME_FILE: nID = !table ? ID_MERGE_COMPARE_TEXT : ID_MERGE_COMPARE_TABLE; break;
-	case FRAME_HEXFILE: nID = ID_MERGE_COMPARE_HEX; break;
-	case FRAME_IMGFILE: nID = ID_MERGE_COMPARE_IMAGE; break;
+		if (strDesc && !strDesc[i].empty())
+			strDesc2[i] = strDesc[i];
+		fileloc[i].encoding.SetCodepage(ucr::getDefaultCodepage());
 	}
-	ShowMergeDoc(nID, pDirDoc, nPanes, fileloc, dwFlags, strDesc);
+	if (infoPrediffer && !infoPrediffer->GetPluginPipeline().empty())
+		pDirDoc->GetPluginManager().SetPrediffer(_T("|"), infoPrediffer->GetPluginPipeline());
+	return ShowMergeDoc(nID, pDirDoc, nPanes, fileloc, dwFlags, strDesc2, _T(""), nullptr, pOpenParams);
 }
 
 /**
@@ -1780,10 +1782,10 @@ void CMainFrame::FileNew(int nPanes, FRAMETYPE frameType, bool table)
  * @sa CMergeDoc::OpenDocs()
  * @sa CMergeDoc::TrySaveAs()
  */
-template <int nFiles, CMainFrame::FRAMETYPE frameType, bool table>
+template <int nFiles, unsigned nID>
 void CMainFrame::OnFileNew() 
 {
-	FileNew(nFiles, frameType, table);
+	DoFileNew(nID, nFiles);
 }
 
 /**
@@ -2477,7 +2479,7 @@ bool CMainFrame::DoOpenConflict(const String& conflictFile, const String strDesc
 				(strDesc && !strDesc[2].empty()) ? strDesc[2] : _("Mine File") };
 			DWORD dwFlags[2] = {FFILEOPEN_READONLY | FFILEOPEN_NOMRU, FFILEOPEN_NOMRU | FFILEOPEN_MODIFIED};
 			PathContext tmpPathContext(revFile, workFile);
-			conflictCompared = DoFileOpen(&tmpPathContext, dwFlags, strDesc2);
+			conflictCompared = DoFileOrFolderOpen(&tmpPathContext, dwFlags, strDesc2);
 		}
 		else
 		{
@@ -2487,7 +2489,7 @@ bool CMainFrame::DoOpenConflict(const String& conflictFile, const String strDesc
 				(strDesc && !strDesc[2].empty()) ? strDesc[2] : _("Mine File") };
 			PathContext tmpPathContext(baseFile, revFile, workFile);
 			DWORD dwFlags[3] = {FFILEOPEN_READONLY | FFILEOPEN_NOMRU, FFILEOPEN_READONLY | FFILEOPEN_NOMRU, FFILEOPEN_NOMRU | FFILEOPEN_MODIFIED};
-			conflictCompared = DoFileOpen(&tmpPathContext, dwFlags, strDesc3);
+			conflictCompared = DoFileOrFolderOpen(&tmpPathContext, dwFlags, strDesc3);
 		}
 	}
 	else
@@ -2498,7 +2500,8 @@ bool CMainFrame::DoOpenConflict(const String& conflictFile, const String strDesc
 }
 
 bool CMainFrame::DoSelfCompare(UINT nID, const String& file, const String strDesc[] /*= nullptr*/,
-	const PackingInfo *infoUnpacker /*= nullptr*/, OpenTextFileParams *pOpenParams /*= nullptr*/)
+	const PackingInfo *infoUnpacker /*= nullptr*/, const PrediffingInfo *infoPrediffer /*= nullptr*/,
+	OpenTextFileParams *pOpenParams /*= nullptr*/)
 {
 	String ext = paths::FindExtension(file);
 	TempFilePtr wTemp(new TempFile());
@@ -2512,7 +2515,7 @@ bool CMainFrame::DoSelfCompare(UINT nID, const String& file, const String strDes
 		(strDesc && !strDesc[1].empty()) ? strDesc[1] : _("") };
 	DWORD dwFlags[2] = {FFILEOPEN_READONLY | FFILEOPEN_NOMRU, FFILEOPEN_NOMRU};
 	PathContext tmpPathContext(copiedFile, file);
-	return DoFileOpen(nID, &tmpPathContext, dwFlags, strDesc2, _T(""), infoUnpacker, pOpenParams);
+	return DoFileOpen(nID, &tmpPathContext, dwFlags, strDesc2, _T(""), infoUnpacker, infoPrediffer, pOpenParams);
 }
 
 /**
diff --git a/Src/MainFrm.h b/Src/MainFrm.h
index f827b4960..228a1d4f0 100644
--- a/Src/MainFrm.h
+++ b/Src/MainFrm.h
@@ -97,16 +97,23 @@ public:
 	HMENU GetPrediffersSubmenu(HMENU mainMenu);
 	void UpdatePrediffersMenu();
 
-	void FileNew(int nPanes, FRAMETYPE frameType, bool table);
-	bool DoFileOpen(const PathContext *pFiles = nullptr,
+	bool DoFileOrFolderOpen(const PathContext *pFiles = nullptr,
 		const DWORD dwFlags[] = nullptr, const String strDesc[] = nullptr,
 		const String& sReportFile = _T(""), bool bRecurse = false, CDirDoc *pDirDoc = nullptr,
-		const PackingInfo * infoUnpacker = nullptr, const PrediffingInfo * infoPrediffer = nullptr, UINT nID = 0, OpenTextFileParams *pOpenParams = nullptr);
+		const PackingInfo * infoUnpacker = nullptr, const PrediffingInfo * infoPrediffer = nullptr,
+		UINT nID = 0, OpenTextFileParams *pOpenParams = nullptr);
 	bool DoFileOpen(UINT nID, const PathContext* pFiles = nullptr,
 		const DWORD dwFlags[] = nullptr, const String strDesc[] = nullptr,
-		const String& sReportFile = _T(""), const PackingInfo* infoUnpacker = nullptr, OpenTextFileParams *pOpenParams = nullptr);
+		const String& sReportFile = _T(""),
+		const PackingInfo* infoUnpacker = nullptr, const PrediffingInfo * infoPrediffer = nullptr,
+		OpenTextFileParams *pOpenParams = nullptr);
+	bool DoFileNew(UINT nID, int nPanes, const String strDesc[] = nullptr,
+		const PrediffingInfo * infoPrediffer = nullptr,
+		OpenTextFileParams *pOpenParams = nullptr);
 	bool DoOpenConflict(const String& conflictFile, const String strDesc[] = nullptr, bool checked = false);
-	bool DoSelfCompare(UINT nID, const String& file, const String strDesc[] = nullptr, const PackingInfo* infoUnpacker = nullptr, OpenTextFileParams* pOpenParams = nullptr);
+	bool DoSelfCompare(UINT nID, const String& file, const String strDesc[] = nullptr,
+		const PackingInfo* infoUnpacker = nullptr, const PrediffingInfo * infoPrediffer = nullptr,
+		OpenTextFileParams* pOpenParams = nullptr);
 	bool ShowAutoMergeDoc(CDirDoc * pDirDoc, int nFiles, const FileLocation fileloc[],
 		const DWORD dwFlags[], const String strDesc[], const String& sReportFile = _T(""),
 		const PackingInfo * infoUnpacker = nullptr, OpenTextFileParams *pOpenParams = nullptr);
@@ -125,9 +132,11 @@ public:
 		const DWORD dwFlags[], const String strDesc[], const String& sReportFile = _T(""),
 		const PackingInfo * infoUnpacker = nullptr, OpenTextFileParams *pOpenParams = nullptr);
 	bool ShowHexMergeDoc(CDirDoc * pDirDoc, int nFiles, const FileLocation fileloc[],
-		const DWORD dwFlags[], const String strDesc[], const String& sReportFile = _T(""), const PackingInfo * infoUnpacker = nullptr);
+		const DWORD dwFlags[], const String strDesc[], const String& sReportFile = _T(""),
+		const PackingInfo * infoUnpacker = nullptr);
 	bool ShowImgMergeDoc(CDirDoc * pDirDoc, int nFiles, const FileLocation fileloc[],
-		const DWORD dwFlags[], const String strDesc[], const String& sReportFile = _T(""), const PackingInfo * infoUnpacker = nullptr);
+		const DWORD dwFlags[], const String strDesc[], const String& sReportFile = _T(""),
+		const PackingInfo * infoUnpacker = nullptr);
 
 	void UpdateResources();
 	void ClearStatusbarItemCount();
@@ -278,7 +287,7 @@ protected:
 	afx_msg void OnUpdatePluginRelatedMenu(CCmdUI* pCmdUI);
 	afx_msg void OnReloadPlugins();
 	afx_msg void OnSaveConfigData();
-	template <int nFiles, FRAMETYPE frameType, bool table = false>
+	template <int nFiles, unsigned nID>
 	afx_msg void OnFileNew();
 	afx_msg void OnToolsFilters();
 	afx_msg void OnViewStatusBar();
diff --git a/Src/Merge.cpp b/Src/Merge.cpp
index e3025ab23..05cad9f31 100644
--- a/Src/Merge.cpp
+++ b/Src/Merge.cpp
@@ -727,14 +727,14 @@ bool CMergeApp::ParseArgsAndDoOpen(MergeCmdLineInfo& cmdInfo, CMainFrame* pMainF
 			cmdInfo.m_dwMiddleFlags |= FFILEOPEN_CMDLINE;
 			cmdInfo.m_dwRightFlags |= FFILEOPEN_CMDLINE;
 			DWORD dwFlags[3] = {cmdInfo.m_dwLeftFlags, cmdInfo.m_dwMiddleFlags, cmdInfo.m_dwRightFlags};
-			bCompared = pMainFrame->DoFileOpen(&cmdInfo.m_Files,
+			bCompared = pMainFrame->DoFileOrFolderOpen(&cmdInfo.m_Files,
 				dwFlags, strDesc, cmdInfo.m_sReportFile, cmdInfo.m_bRecurse, nullptr,
 				infoUnpacker.get(), infoPrediffer.get(), nID, &openParams);
 		}
 		else if (cmdInfo.m_Files.GetSize() > 1)
 		{
 			DWORD dwFlags[3] = {cmdInfo.m_dwLeftFlags, cmdInfo.m_dwRightFlags, FFILEOPEN_NONE};
-			bCompared = pMainFrame->DoFileOpen(&cmdInfo.m_Files,
+			bCompared = pMainFrame->DoFileOrFolderOpen(&cmdInfo.m_Files,
 				dwFlags, strDesc, cmdInfo.m_sReportFile, cmdInfo.m_bRecurse, nullptr,
 				infoUnpacker.get(), infoPrediffer.get(), nID, &openParams);
 		}
@@ -745,7 +745,8 @@ bool CMergeApp::ParseArgsAndDoOpen(MergeCmdLineInfo& cmdInfo, CMainFrame* pMainF
 			{
 				strDesc[0] = cmdInfo.m_sLeftDesc;
 				strDesc[1] = cmdInfo.m_sRightDesc;
-				bCompared = pMainFrame->DoSelfCompare(nID, sFilepath, strDesc, nullptr, &openParams);
+				bCompared = pMainFrame->DoSelfCompare(nID, sFilepath, strDesc,
+					infoUnpacker.get(), infoPrediffer.get(), &openParams);
 			}
 			else if (IsProjectFile(sFilepath))
 			{
@@ -762,16 +763,23 @@ bool CMergeApp::ParseArgsAndDoOpen(MergeCmdLineInfo& cmdInfo, CMainFrame* pMainF
 			else
 			{
 				DWORD dwFlags[3] = {cmdInfo.m_dwLeftFlags, cmdInfo.m_dwRightFlags, FFILEOPEN_NONE};
-				bCompared = pMainFrame->DoFileOpen(&cmdInfo.m_Files,
+				bCompared = pMainFrame->DoFileOrFolderOpen(&cmdInfo.m_Files,
 					dwFlags, strDesc, cmdInfo.m_sReportFile, cmdInfo.m_bRecurse, nullptr,
 					infoUnpacker.get(), infoPrediffer.get(), nID, &openParams);
 			}
 		}
 		else if (cmdInfo.m_Files.GetSize() == 0) // if there are no input args, we can check the display file dialog flag
 		{
-			bool showFiles = m_pOptions->GetBool(OPT_SHOW_SELECT_FILES_AT_STARTUP);
-			if (showFiles)
-				pMainFrame->DoFileOpen();
+			if (!cmdInfo.m_bNewCompare)
+			{
+				bool showFiles = m_pOptions->GetBool(OPT_SHOW_SELECT_FILES_AT_STARTUP);
+				if (showFiles)
+					pMainFrame->DoFileOrFolderOpen();
+			}
+			else
+			{
+				bCompared = pMainFrame->DoFileNew(nID, 2, strDesc, infoPrediffer.get(), &openParams);
+			}
 		}
 	}
 	return bCompared;
@@ -1254,7 +1262,7 @@ bool CMergeApp::LoadAndOpenProjectFile(const String& sProject, const String& sRe
 
 		GetOptionsMgr()->SaveOption(OPT_CMP_INCLUDE_SUBDIRS, bRecursive);
 
-		rtn &= GetMainFrame()->DoFileOpen(&tFiles, dwFlags, nullptr, sReportFile, bRecursive,
+		rtn &= GetMainFrame()->DoFileOrFolderOpen(&tFiles, dwFlags, nullptr, sReportFile, bRecursive,
 			nullptr, pInfoUnpacker.get(), pInfoPrediffer.get());
 	}
 
diff --git a/Src/MergeCmdLineInfo.cpp b/Src/MergeCmdLineInfo.cpp
index da76fe1a2..55bb1f67d 100644
--- a/Src/MergeCmdLineInfo.cpp
+++ b/Src/MergeCmdLineInfo.cpp
@@ -125,6 +125,7 @@ MergeCmdLineInfo::MergeCmdLineInfo(const TCHAR* q)
 	, m_bNoPrefs(false)
 	, m_nCodepage(0)
 	, m_bSelfCompare(false)
+	, m_bNewCompare(false)
 	, m_dwLeftFlags(FFILEOPEN_NONE)
 	, m_dwMiddleFlags(FFILEOPEN_NONE)
 	, m_dwRightFlags(FFILEOPEN_NONE)
@@ -312,6 +313,11 @@ void MergeCmdLineInfo::ParseWinMergeCmdLine(const TCHAR *q)
 			// -self-compare means compare a specified file with a copy of the file
 			m_bSelfCompare = true;
 		}
+		else if (param == _T("new"))
+		{
+			// -new means to display a new blank window
+			m_bNewCompare = true;
+		}
 		else if (param == _T("minimize"))
 		{
 			// -minimize means minimize the main window.
diff --git a/Src/MergeCmdLineInfo.h b/Src/MergeCmdLineInfo.h
index 56afc44f2..3be64b5c2 100644
--- a/Src/MergeCmdLineInfo.h
+++ b/Src/MergeCmdLineInfo.h
@@ -74,6 +74,7 @@ public:
 	int  m_nCodepage;  /**< Codepage. */
 	bool m_bNoPrefs; /**< Do not load or remember options (preferences) */   
 	bool m_bSelfCompare; /**< Compares the specified file with a copy of the file */
+	bool m_bNewCompare; /**< Show a new blank window */
 	int m_nLineIndex; /**< Line number to jump after loading files */
 	std::optional<TCHAR> m_cTableDelimiter; /**< Delimiter character for table editing*/
 	std::optional<TCHAR> m_cTableQuote; /* Quote character for table editing *< */
diff --git a/Src/OpenView.cpp b/Src/OpenView.cpp
index 8946fcf96..1ce393faa 100644
--- a/Src/OpenView.cpp
+++ b/Src/OpenView.cpp
@@ -657,14 +657,14 @@ void COpenView::OnCompare(UINT nID)
 	bool recurse = pDoc->m_bRecurse;
 	if (nID == IDOK)
 	{
-		GetMainFrame()->DoFileOpen(
+		GetMainFrame()->DoFileOrFolderOpen(
 			&tmpPathContext, dwFlags.data(),
 			nullptr, _T(""), recurse, nullptr, &tmpPackingInfo, nullptr);
 	}
 	else if (ID_UNPACKERS_FIRST <= nID && nID <= ID_UNPACKERS_LAST)
 	{
 		tmpPackingInfo.SetPluginPipeline(CMainFrame::GetPluginPipelineByMenuId(nID, FileTransform::UnpackerEventNames, ID_UNPACKERS_FIRST));
-		GetMainFrame()->DoFileOpen(
+		GetMainFrame()->DoFileOrFolderOpen(
 			&tmpPathContext, dwFlags.data(),
 			nullptr, _T(""), recurse, nullptr, &tmpPackingInfo, nullptr);
 	}
@@ -675,7 +675,7 @@ void COpenView::OnCompare(UINT nID)
 		if (dlg.DoModal() == IDOK)
 		{
 			tmpPackingInfo.SetPluginPipeline(dlg.GetPluginPipeline());
-			GetMainFrame()->DoFileOpen(
+			GetMainFrame()->DoFileOrFolderOpen(
 				&tmpPathContext, dwFlags.data(),
 				nullptr, _T(""), recurse, nullptr, &tmpPackingInfo, nullptr);
 		}
-- 
2.11.0