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📁 ..	-	2025-07-21 16:25
📁 completion	-	2026-03-21 15:45
📄 diff-highlight #!/usr/bin/perl package DiffHighlight; use 5.008001; use warnings FATAL => 'all'; use strict; # Use the correct value for both UNIX and Windows (/dev/null vs nul) use File::Spec; my $NULL = File::Spec->devnull(); # Highlight by reversing foreground and background. You could do # other things like bold or underline if you prefer. my @OLD_HIGHLIGHT = ( color_config('color.diff-highlight.oldnormal'), color_config('color.diff-highlight.oldhighlight', "\x1b[7m"), color_config('color.diff-highlight.oldreset', "\x1b[27m") ); my @NEW_HIGHLIGHT = ( color_config('color.diff-highlight.newnormal', $OLD_HIGHLIGHT[0]), color_config('color.diff-highlight.newhighlight', $OLD_HIGHLIGHT[1]), color_config('color.diff-highlight.newreset', $OLD_HIGHLIGHT[2]) ); my $RESET = "\x1b[m"; my $COLOR = qr/\x1b\[[0-9;]m/; my $BORING = qr/$COLOR\|\s/; my @removed; my @added; my $in_hunk; my $graph_indent = 0; our $line_cb = sub { print @_ }; our $flush_cb = sub { local $\| = 1 }; # Count the visible width of a string, excluding any terminal color sequences. sub visible_width { local $_ = shift; my $ret = 0; while (length) { if (s/^$COLOR//) { # skip colors } elsif (s/^.//) { $ret++; } } return $ret; } # Return a substring of $str, omitting $len visible characters from the # beginning, where terminal color sequences do not count as visible. sub visible_substr { my ($str, $len) = @_; while ($len > 0) { if ($str =~ s/^$COLOR//) { next } $str =~ s/^.//; $len--; } return $str; } sub handle_line { my $orig = shift; local $_ = $orig; # match a graph line that begins a commit if (/^(?:$COLOR?\\|$COLOR?[ ]) # zero or more leading "\|" with space $COLOR?\$COLOR?[ ] # a "" with its trailing space (?:$COLOR?\\|$COLOR?[ ])* # zero or more trailing "\|" [ ]* # trailing whitespace for merges /x) { my $graph_prefix = $&; # We must flush before setting graph indent, since the # new commit may be indented differently from what we # queued. flush(); $graph_indent = visible_width($graph_prefix); } elsif ($graph_indent) { if (length($_) < $graph_indent) { $graph_indent = 0; } else { $_ = visible_substr($_, $graph_indent); } } if (!$in_hunk) { $line_cb->($orig); $in_hunk = /^$COLOR\@\@ /; } elsif (/^$COLOR-/) { push @removed, $orig; } elsif (/^$COLOR\+/) { push @added, $orig; } else { flush(); $line_cb->($orig); $in_hunk = /^$COLOR[\@ ]/; } # Most of the time there is enough output to keep things streaming, # but for something like "git log -Sfoo", you can get one early # commit and then many seconds of nothing. We want to show # that one commit as soon as possible. # # Since we can receive arbitrary input, there's no optimal # place to flush. Flushing on a blank line is a heuristic that # happens to match git-log output. if (/^$/) { $flush_cb->(); } } sub flush { # Flush any queued hunk (this can happen when there is no trailing # context in the final diff of the input). show_hunk(\@removed, \@added); @removed = (); @added = (); } sub highlight_stdin { while (<STDIN>) { handle_line($_); } flush(); } # Ideally we would feed the default as a human-readable color to # git-config as the fallback value. But diff-highlight does # not otherwise depend on git at all, and there are reports # of it being used in other settings. Let's handle our own # fallback, which means we will work even if git can't be run. sub color_config { my ($key, $default) = @_; my $s = `git config --get-color $key 2>$NULL`; return length($s) ? $s : $default; } sub show_hunk { my ($a, $b) = @_; # If one side is empty, then there is nothing to compare or highlight. if (!@$a \|\| !@$b) { $line_cb->(@$a, @$b); return; } # If we have mismatched numbers of lines on each side, we could try to # be clever and match up similar lines. But for now we are simple and # stupid, and only handle multi-line hunks that remove and add the same # number of lines. if (@$a != @$b) { $line_cb->(@$a, @$b); return; } my @queue; for (my $i = 0; $i < @$a; $i++) { my ($rm, $add) = highlight_pair($a->[$i], $b->[$i]); $line_cb->($rm); push @queue, $add; } $line_cb->(@queue); } sub highlight_pair { my @a = split_line(shift); my @b = split_line(shift); # Find common prefix, taking care to skip any ansi # color codes. my $seen_plusminus; my ($pa, $pb) = (0, 0); while ($pa < @a && $pb < @b) { if ($a[$pa] =~ /$COLOR/) { $pa++; } elsif ($b[$pb] =~ /$COLOR/) { $pb++; } elsif ($a[$pa] eq $b[$pb]) { $pa++; $pb++; } elsif (!$seen_plusminus && $a[$pa] eq '-' && $b[$pb] eq '+') { $seen_plusminus = 1; $pa++; $pb++; } else { last; } } # Find common suffix, ignoring colors. my ($sa, $sb) = ($#a, $#b); while ($sa >= $pa && $sb >= $pb) { if ($a[$sa] =~ /$COLOR/) { $sa--; } elsif ($b[$sb] =~ /$COLOR/) { $sb--; } elsif ($a[$sa] eq $b[$sb]) { $sa--; $sb--; } else { last; } } if (is_pair_interesting(\@a, $pa, $sa, \@b, $pb, $sb)) { return highlight_line(\@a, $pa, $sa, \@OLD_HIGHLIGHT), highlight_line(\@b, $pb, $sb, \@NEW_HIGHLIGHT); } else { return join('', @a), join('', @b); } } # we split either by $COLOR or by character. This has the side effect of # leaving in graph cruft. It works because the graph cruft does not contain "-" # or "+" sub split_line { local $_ = shift; return utf8::decode($_) ? map { utf8::encode($_); $_ } map { /$COLOR/ ? $_ : (split //) } split /($COLOR+)/ : map { /$COLOR/ ? $_ : (split //) } split /($COLOR+)/; } sub highlight_line { my ($line, $prefix, $suffix, $theme) = @_; my $start = join('', @{$line}[0..($prefix-1)]); my $mid = join('', @{$line}[$prefix..$suffix]); my $end = join('', @{$line}[($suffix+1)..$#$line]); # If we have a "normal" color specified, then take over the whole line. # Otherwise, we try to just manipulate the highlighted bits. if (defined $theme->[0]) { s/$COLOR//g for ($start, $mid, $end); chomp $end; return join('', $theme->[0], $start, $RESET, $theme->[1], $mid, $RESET, $theme->[0], $end, $RESET, "\n" ); } else { return join('', $start, $theme->[1], $mid, $theme->[2], $end ); } } # Pairs are interesting to highlight only if we are going to end up # highlighting a subset (i.e., not the whole line). Otherwise, the highlighting # is just useless noise. We can detect this by finding either a matching prefix # or suffix (disregarding boring bits like whitespace and colorization). sub is_pair_interesting { my ($a, $pa, $sa, $b, $pb, $sb) = @_; my $prefix_a = join('', @$a[0..($pa-1)]); my $prefix_b = join('', @$b[0..($pb-1)]); my $suffix_a = join('', @$a[($sa+1)..$#$a]); my $suffix_b = join('', @$b[($sb+1)..$#$b]); return visible_substr($prefix_a, $graph_indent) !~ /^$COLOR-$BORING$/ \|\| visible_substr($prefix_b, $graph_indent) !~ /^$COLOR\+$BORING$/ \|\| $suffix_a !~ /^$BORING$/ \|\| $suffix_b !~ /^$BORING$/; } package main; # Some scripts may not realize that SIGPIPE is being ignored when launching the # pager--for instance scripts written in Python. $SIG{PIPE} = 'DEFAULT'; DiffHighlight::highlight_stdin(); exit 0;	7.11 KB	2025-07-21 16:25
📁 hooks	-	2026-03-21 15:45

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