gitweb: Add combined diff support to git_patchset_body

Calling convention for combined diff similar to the one for
git_difftree_body subroutine: difftree info (first parameter) must be
result of calling git-diff-tree with -c/--cc option, and all parents
of a commit must be passed as last parameters. See also description in
  "gitweb: Add combined diff support to git_difftree_body"

This ability is not used yet.

Generating "src" file name for renames in combined diff was separated
into fill_from_file_info subroutine; git_difftree_body was modified to
use it. Currently git_difftree_body and git_patchset_body fills this
info separately.

The from-file line in two-line from-file/to-file header is not
hyperlinked: there can be more than one "from"/"src" file. This
differs from HTML output of ordinary (not combined) diff.

format_diff_line subroutine needs extra $from/$to parameters to format
combined diff patch line correctly.

Signed-off-by: Jakub Narebski <jnareb@gmail.com>
Signed-off-by: Junio C Hamano <junkio@cox.net>

diff --git a/gitweb/gitweb.perl b/gitweb/gitweb.perl
index c6a2fef..53ae0b8 100755 (executable)
--- a/gitweb/gitweb.perl
+++ b/gitweb/gitweb.perl
@@ -897,19 +897,34 @@ sub format_subject_html {
 sub format_diff_line {
        my $line = shift;
        my ($from, $to) = @_;
-       my $char = substr($line, 0, 1);
        my $diff_class = "";
 
        chomp $line;
 
-       if ($char eq '+') {
-               $diff_class = " add";
-       } elsif ($char eq "-") {
-               $diff_class = " rem";
-       } elsif ($char eq "@") {
-               $diff_class = " chunk_header";
-       } elsif ($char eq "\\") {
-               $diff_class = " incomplete";
+       if ($from && $to && ref($from->{'href'}) eq "ARRAY") {
+               # combined diff
+               my $prefix = substr($line, 0, scalar @{$from->{'href'}});
+               if ($line =~ m/^\@{3}/) {
+                       $diff_class = " chunk_header";
+               } elsif ($line =~ m/^\\/) {
+                       $diff_class = " incomplete";
+               } elsif ($prefix =~ tr/+/+/) {
+                       $diff_class = " add";
+               } elsif ($prefix =~ tr/-/-/) {
+                       $diff_class = " rem";
+               }
+       } else {
+               # assume ordinary diff
+               my $char = substr($line, 0, 1);
+               if ($char eq '+') {
+                       $diff_class = " add";
+               } elsif ($char eq '-') {
+                       $diff_class = " rem";
+               } elsif ($char eq '@') {
+                       $diff_class = " chunk_header";
+               } elsif ($char eq "\\") {
+                       $diff_class = " incomplete";
+               }
        }
        $line = untabify($line);
        if ($from && $to && $line =~ m/^\@{2} /) {
@@ -930,6 +945,39 @@ sub format_diff_line {
                $line = "<span class=\"chunk_info\">@@ $from_text $to_text @@</span>" .
                        "<span class=\"section\">" . esc_html($section, -nbsp=>1) . "</span>";
                return "<div class=\"diff$diff_class\">$line</div>\n";
+       } elsif ($from && $to && $line =~ m/^\@{3}/) {
+               my ($prefix, $ranges, $section) = $line =~ m/^(\@+) (.*?) \@+(.*)$/;
+               my (@from_text, @from_start, @from_nlines, $to_text, $to_start, $to_nlines);
+
+               @from_text = split(' ', $ranges);
+               for (my $i = 0; $i < @from_text; ++$i) {
+                       ($from_start[$i], $from_nlines[$i]) =
+                               (split(',', substr($from_text[$i], 1)), 0);
+               }
+
+               $to_text   = pop @from_text;
+               $to_start  = pop @from_start;
+               $to_nlines = pop @from_nlines;
+
+               $line = "<span class=\"chunk_info\">$prefix ";
+               for (my $i = 0; $i < @from_text; ++$i) {
+                       if ($from->{'href'}[$i]) {
+                               $line .= $cgi->a({-href=>"$from->{'href'}[$i]#l$from_start[$i]",
+                                                 -class=>"list"}, $from_text[$i]);
+                       } else {
+                               $line .= $from_text[$i];
+                       }
+                       $line .= " ";
+               }
+               if ($to->{'href'}) {
+                       $line .= $cgi->a({-href=>"$to->{'href'}#l$to_start",
+                                         -class=>"list"}, $to_text);
+               } else {
+                       $line .= $to_text;
+               }
+               $line .= " $prefix</span>" .
+                        "<span class=\"section\">" . esc_html($section, -nbsp=>1) . "</span>";
+               return "<div class=\"diff$diff_class\">$line</div>\n";
        }
        return "<div class=\"diff$diff_class\">" . esc_html($line, -nbsp=>1) . "</div>\n";
 }
@@ -2233,6 +2281,39 @@ sub git_print_tree_entry {
 ## ......................................................................
 ## functions printing large fragments of HTML
 
+sub fill_from_file_info {
+       my ($diff, @parents) = @_;
+
+       $diff->{'from_file'} = [ ];
+       $diff->{'from_file'}[$diff->{'nparents'} - 1] = undef;
+       for (my $i = 0; $i < $diff->{'nparents'}; $i++) {
+               if ($diff->{'status'}[$i] eq 'R' ||
+                   $diff->{'status'}[$i] eq 'C') {
+                       $diff->{'from_file'}[$i] =
+                               git_get_path_by_hash($parents[$i], $diff->{'from_id'}[$i]);
+               }
+       }
+
+       return $diff;
+}
+
+# parameters can be strings, or references to arrays of strings
+sub from_ids_eq {
+       my ($a, $b) = @_;
+
+       if (ref($a) eq "ARRAY" && ref($b) eq "ARRAY" && @$a == @$b) {
+               for (my $i = 0; $i < @$a; ++$i) {
+                       return 0 unless ($a->[$i] eq $b->[$i]);
+               }
+               return 1;
+       } elsif (!ref($a) && !ref($b)) {
+               return $a eq $b;
+       } else {
+               return 0;
+       }
+}
+
+
 sub git_difftree_body {
        my ($difftree, $hash, @parents) = @_;
        my ($parent) = $parents[0];
@@ -2260,6 +2341,8 @@ sub git_difftree_body {
 
                if (exists $diff{'nparents'}) { # combined diff
 
+                       fill_from_file_info(\%diff, @parents);
+
                        if ($diff{'to_id'} ne ('0' x 40)) {
                                # file exists in the result (child) commit
                                print "<td>" .
@@ -2288,16 +2371,12 @@ sub git_difftree_body {
                        for (my $i = 0; $i < $diff{'nparents'}; $i++) {
                                my $hash_parent = $parents[$i];
                                my $from_hash = $diff{'from_id'}[$i];
-                               my $from_path = undef;
+                               my $from_path = $diff{'from_file'}[$i];
                                my $status = $diff{'status'}[$i];
 
                                $has_history ||= ($status ne 'A');
                                $not_deleted ||= ($status ne 'D');
 
-                               if ($status eq 'R' || $status eq 'C') {
-                                       $from_path = git_get_path_by_hash($hash_parent, $from_hash);
-                               }
-
                                if ($status eq 'A') {
                                        print "<td  class=\"link\" align=\"right\"> | </td>\n";
                                } elsif ($status eq 'D') {
@@ -2517,7 +2596,8 @@ sub git_difftree_body {
 }
 
 sub git_patchset_body {
-       my ($fd, $difftree, $hash, $hash_parent) = @_;
+       my ($fd, $difftree, $hash, @hash_parents) = @_;
+       my ($hash_parent) = $hash_parents[0];
 
        my $patch_idx = 0;
        my $patch_number = 0;
@@ -2555,6 +2635,9 @@ sub git_patchset_body {
                        if ($patch_line =~ m/^index ([0-9a-fA-F]{40})..([0-9a-fA-F]{40})/) {
                                $from_id = $1;
                                $to_id   = $2;
+                       } elsif ($patch_line =~ m/^index ((?:[0-9a-fA-F]{40},)+[0-9a-fA-F]{40})..([0-9a-fA-F]{40})/) {
+                               $from_id = [ split(',', $1) ];
+                               $to_id   = $2;
                        }
 
                        push @diff_header, $patch_line;
@@ -2564,8 +2647,8 @@ sub git_patchset_body {
                # check if current patch belong to current raw line
                # and parse raw git-diff line if needed
                if (defined $diffinfo &&
-                   $diffinfo->{'from_id'} eq $from_id &&
-                   $diffinfo->{'to_id'}   eq $to_id) {
+                   from_ids_eq($diffinfo->{'from_id'}, $from_id) &&
+                   $diffinfo->{'to_id'} eq $to_id) {
                        # this is split patch
                        print "<div class=\"patch cont\">\n";
                } else {
@@ -2579,15 +2662,34 @@ sub git_patchset_body {
                        } else {
                                $diffinfo = parse_difftree_raw_line($difftree->[$patch_idx]);
                        }
-                       $from{'file'} = $diffinfo->{'from_file'} || $diffinfo->{'file'};
-                       $to{'file'}   = $diffinfo->{'to_file'}   || $diffinfo->{'file'};
-                       if ($diffinfo->{'status'} ne "A") { # not new (added) file
-                               $from{'href'} = href(action=>"blob", hash_base=>$hash_parent,
-                                                    hash=>$diffinfo->{'from_id'},
-                                                    file_name=>$from{'file'});
+                       if ($diffinfo->{'nparents'}) {
+                               # combined diff
+                               $from{'file'} = [];
+                               $from{'href'} = [];
+                               fill_from_file_info($diffinfo, @hash_parents)
+                                       unless exists $diffinfo->{'from_file'};
+                               for (my $i = 0; $i < $diffinfo->{'nparents'}; $i++) {
+                                       $from{'file'}[$i] = $diffinfo->{'from_file'}[$i] || $diffinfo->{'to_file'};
+                                       if ($diffinfo->{'status'}[$i] ne "A") { # not new (added) file
+                                               $from{'href'}[$i] = href(action=>"blob",
+                                                                        hash_base=>$hash_parents[$i],
+                                                                        hash=>$diffinfo->{'from_id'}[$i],
+                                                                        file_name=>$from{'file'}[$i]);
+                                       } else {
+                                               $from{'href'}[$i] = undef;
+                                       }
+                               }
                        } else {
-                               delete $from{'href'};
+                               $from{'file'} = $diffinfo->{'from_file'} || $diffinfo->{'file'};
+                               if ($diffinfo->{'status'} ne "A") { # not new (added) file
+                                       $from{'href'} = href(action=>"blob", hash_base=>$hash_parent,
+                                                            hash=>$diffinfo->{'from_id'},
+                                                            file_name=>$from{'file'});
+                               } else {
+                                       delete $from{'href'};
+                               }
                        }
+                       $to{'file'} = $diffinfo->{'to_file'} || $diffinfo->{'file'};
                        if ($diffinfo->{'status'} ne "D") { # not deleted file
                                $to{'href'} = href(action=>"blob", hash_base=>$hash,
                                                   hash=>$diffinfo->{'to_id'},
@@ -2602,19 +2704,34 @@ sub git_patchset_body {
 
                # print "git diff" header
                $patch_line = shift @diff_header;
-               $patch_line =~ s!^(diff (.*?) )"?a/.*$!$1!;
-               if ($from{'href'}) {
-                       $patch_line .= $cgi->a({-href => $from{'href'}, -class => "path"},
-                                              'a/' . esc_path($from{'file'}));
-               } else { # file was added
-                       $patch_line .= 'a/' . esc_path($from{'file'});
-               }
-               $patch_line .= ' ';
-               if ($to{'href'}) {
-                       $patch_line .= $cgi->a({-href => $to{'href'}, -class => "path"},
-                                              'b/' . esc_path($to{'file'}));
-               } else { # file was deleted
-                       $patch_line .= 'b/' . esc_path($to{'file'});
+               if ($diffinfo->{'nparents'}) {
+
+                       # combined diff
+                       $patch_line =~ s!^(diff (.*?) )"?.*$!$1!;
+                       if ($to{'href'}) {
+                               $patch_line .= $cgi->a({-href => $to{'href'}, -class => "path"},
+                                                      esc_path($to{'file'}));
+                       } else { # file was deleted
+                               $patch_line .= esc_path($to{'file'});
+                       }
+
+               } else {
+
+                       $patch_line =~ s!^(diff (.*?) )"?a/.*$!$1!;
+                       if ($from{'href'}) {
+                               $patch_line .= $cgi->a({-href => $from{'href'}, -class => "path"},
+                                                      'a/' . esc_path($from{'file'}));
+                       } else { # file was added
+                               $patch_line .= 'a/' . esc_path($from{'file'});
+                       }
+                       $patch_line .= ' ';
+                       if ($to{'href'}) {
+                               $patch_line .= $cgi->a({-href => $to{'href'}, -class => "path"},
+                                                      'b/' . esc_path($to{'file'}));
+                       } else { # file was deleted
+                               $patch_line .= 'b/' . esc_path($to{'file'});
+                       }
+
                }
                print "<div class=\"diff header\">$patch_line</div>\n";
 
@@ -2631,14 +2748,37 @@ sub git_patchset_body {
                                $patch_line .= $cgi->a({-href=>$to{'href'}, -class=>"path"},
                                                       esc_path($to{'file'}));
                        }
-                       # match <mode>
+                       # match single <mode>
                        if ($patch_line =~ m/\s(\d{6})$/) {
                                $patch_line .= '<span class="info"> (' .
                                               file_type_long($1) .
                                               ')</span>';
                        }
                        # match <hash>
-                       if ($patch_line =~ m/^index/) {
+                       if ($patch_line =~ m/^index [0-9a-fA-F]{40},[0-9a-fA-F]{40}/) {
+                               # can match only for combined diff
+                               $patch_line = 'index ';
+                               for (my $i = 0; $i < $diffinfo->{'nparents'}; $i++) {
+                                       if ($from{'href'}[$i]) {
+                                               $patch_line .= $cgi->a({-href=>$from{'href'}[$i],
+                                                                       -class=>"hash"},
+                                                                      substr($diffinfo->{'from_id'}[$i],0,7));
+                                       } else {
+                                               $patch_line .= '0' x 7;
+                                       }
+                                       # separator
+                                       $patch_line .= ',' if ($i < $diffinfo->{'nparents'} - 1);
+                               }
+                               $patch_line .= '..';
+                               if ($to{'href'}) {
+                                       $patch_line .= $cgi->a({-href=>$to{'href'}, -class=>"hash"},
+                                                              substr($diffinfo->{'to_id'},0,7));
+                               } else {
+                                       $patch_line .= '0' x 7;
+                               }
+
+                       } elsif ($patch_line =~ m/^index [0-9a-fA-F]{40}..[0-9a-fA-F]{40}/) {
+                               # can match only for ordinary diff
                                my ($from_link, $to_link);
                                if ($from{'href'}) {
                                        $from_link = $cgi->a({-href=>$from{'href'}, -class=>"hash"},
@@ -2674,7 +2814,8 @@ sub git_patchset_body {
                }
                next PATCH if ($patch_line =~ m/^diff /);
                #assert($patch_line =~ m/^---/) if DEBUG;
-               if ($from{'href'} && $patch_line =~ m!^--- "?a/!) {
+               if (!$diffinfo->{'nparents'} && # not from-file line for combined diff
+                   $from{'href'} && $patch_line =~ m!^--- "?a/!) {
                        $patch_line = '--- a/' .
                                      $cgi->a({-href=>$from{'href'}, -class=>"path"},
                                              esc_path($from{'file'}));