+# Print context lines and then rem/add lines in a side-by-side manner.
+sub print_sidebyside_diff_lines {
+ my ($ctx, $rem, $add) = @_;
+
+ # print context block before add/rem block
+ if (@$ctx) {
+ print join '',
+ '<div class="chunk_block ctx">',
+ '<div class="old">',
+ @$ctx,
+ '</div>',
+ '<div class="new">',
+ @$ctx,
+ '</div>',
+ '</div>';
+ }
+
+ if (!@$add) {
+ # pure removal
+ print join '',
+ '<div class="chunk_block rem">',
+ '<div class="old">',
+ @$rem,
+ '</div>',
+ '</div>';
+ } elsif (!@$rem) {
+ # pure addition
+ print join '',
+ '<div class="chunk_block add">',
+ '<div class="new">',
+ @$add,
+ '</div>',
+ '</div>';
+ } else {
+ print join '',
+ '<div class="chunk_block chg">',
+ '<div class="old">',
+ @$rem,
+ '</div>',
+ '<div class="new">',
+ @$add,
+ '</div>',
+ '</div>';
+ }
+}
+
+# Print context lines and then rem/add lines in inline manner.
+sub print_inline_diff_lines {
+ my ($ctx, $rem, $add) = @_;
+
+ print @$ctx, @$rem, @$add;
+}
+
+# Format removed and added line, mark changed part and HTML-format them.
+# Implementation is based on contrib/diff-highlight
+sub format_rem_add_lines_pair {
+ my ($rem, $add, $num_parents) = @_;
+
+ # We need to untabify lines before split()'ing them;
+ # otherwise offsets would be invalid.
+ chomp $rem;
+ chomp $add;
+ $rem = untabify($rem);
+ $add = untabify($add);
+
+ my @rem = split(//, $rem);
+ my @add = split(//, $add);
+ my ($esc_rem, $esc_add);
+ # Ignore leading +/- characters for each parent.
+ my ($prefix_len, $suffix_len) = ($num_parents, 0);
+ my ($prefix_has_nonspace, $suffix_has_nonspace);
+
+ my $shorter = (@rem < @add) ? @rem : @add;
+ while ($prefix_len < $shorter) {
+ last if ($rem[$prefix_len] ne $add[$prefix_len]);
+
+ $prefix_has_nonspace = 1 if ($rem[$prefix_len] !~ /\s/);
+ $prefix_len++;
+ }
+
+ while ($prefix_len + $suffix_len < $shorter) {
+ last if ($rem[-1 - $suffix_len] ne $add[-1 - $suffix_len]);
+
+ $suffix_has_nonspace = 1 if ($rem[-1 - $suffix_len] !~ /\s/);
+ $suffix_len++;
+ }
+
+ # Mark lines that are different from each other, but have some common
+ # part that isn't whitespace. If lines are completely different, don't
+ # mark them because that would make output unreadable, especially if
+ # diff consists of multiple lines.
+ if ($prefix_has_nonspace || $suffix_has_nonspace) {
+ $esc_rem = esc_html_hl_regions($rem, 'marked',
+ [$prefix_len, @rem - $suffix_len], -nbsp=>1);
+ $esc_add = esc_html_hl_regions($add, 'marked',
+ [$prefix_len, @add - $suffix_len], -nbsp=>1);
+ } else {
+ $esc_rem = esc_html($rem, -nbsp=>1);
+ $esc_add = esc_html($add, -nbsp=>1);
+ }
+
+ return format_diff_line(\$esc_rem, 'rem'),
+ format_diff_line(\$esc_add, 'add');
+}
+
+# HTML-format diff context, removed and added lines.
+sub format_ctx_rem_add_lines {
+ my ($ctx, $rem, $add, $num_parents) = @_;
+ my (@new_ctx, @new_rem, @new_add);
+ my $can_highlight = 0;
+ my $is_combined = ($num_parents > 1);
+
+ # Highlight if every removed line has a corresponding added line.
+ if (@$add > 0 && @$add == @$rem) {
+ $can_highlight = 1;
+
+ # Highlight lines in combined diff only if the chunk contains
+ # diff between the same version, e.g.
+ #
+ # - a
+ # - b
+ # + c
+ # + d
+ #
+ # Otherwise the highlightling would be confusing.
+ if ($is_combined) {
+ for (my $i = 0; $i < @$add; $i++) {
+ my $prefix_rem = substr($rem->[$i], 0, $num_parents);
+ my $prefix_add = substr($add->[$i], 0, $num_parents);
+
+ $prefix_rem =~ s/-/+/g;
+
+ if ($prefix_rem ne $prefix_add) {
+ $can_highlight = 0;
+ last;
+ }
+ }
+ }
+ }
+
+ if ($can_highlight) {
+ for (my $i = 0; $i < @$add; $i++) {
+ my ($line_rem, $line_add) = format_rem_add_lines_pair(
+ $rem->[$i], $add->[$i], $num_parents);
+ push @new_rem, $line_rem;
+ push @new_add, $line_add;
+ }
+ } else {
+ @new_rem = map { format_diff_line($_, 'rem') } @$rem;
+ @new_add = map { format_diff_line($_, 'add') } @$add;
+ }
+
+ @new_ctx = map { format_diff_line($_, 'ctx') } @$ctx;
+
+ return (\@new_ctx, \@new_rem, \@new_add);
+}
+
+# Print context lines and then rem/add lines.
+sub print_diff_lines {
+ my ($ctx, $rem, $add, $diff_style, $num_parents) = @_;
+ my $is_combined = $num_parents > 1;
+
+ ($ctx, $rem, $add) = format_ctx_rem_add_lines($ctx, $rem, $add,
+ $num_parents);
+
+ if ($diff_style eq 'sidebyside' && !$is_combined) {
+ print_sidebyside_diff_lines($ctx, $rem, $add);
+ } else {
+ # default 'inline' style and unknown styles
+ print_inline_diff_lines($ctx, $rem, $add);
+ }
+}
+
+sub print_diff_chunk {
+ my ($diff_style, $num_parents, $from, $to, @chunk) = @_;
Lady’s Gitweb / Gitweb / blobdiff