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diff-highlight: allow configurable colors

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Until now, the highlighting colors were hard-coded in the
script (as "reverse" and "noreverse"), and you had to edit
the script to change them. This patch teaches diff-highlight
to read from color.diff-highlight.* to set them.

In addition, it expands the possiblities considerably by
adding two features:

  1. Old/new lines can be colored independently (so you can
     use a color scheme that complements existing line
     coloring).

  2. Normal, unhighlighted parts of the lines can be colored,
     too. Technically this can be done by separately
     configuring color.diff.old/new and matching it to your
     diff-highlight colors. But you may want a different
     look for your highlighted diffs versus your regular
     diffs.

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Jeff King
2014-11-20 10:29:18 -05:00
committed by Junio C Hamano
parent ff40d185d2
commit bca45fbc1f
2 changed files with 89 additions and 12 deletions
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60
contrib/diff-highlight/diff-highlight
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@@ -5,8 +5,18 @@ use strict;
# Highlight by reversing foreground and background. You could do
# other things like bold or underline if you prefer.
my $HIGHLIGHT = "\x1b[7m";
my $UNHIGHLIGHT = "\x1b[27m";
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/;
@@ -53,6 +63,17 @@ show_hunk(\@removed, \@added);
exit 0;
# 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 $key 2>/dev/null`;
return length($s) ? $s : $default;
}
sub show_hunk {
my ($a, $b) = @_;
@@ -128,8 +149,8 @@ sub highlight_pair {
}
if (is_pair_interesting(\@a, $pa, $sa, \@b, $pb, $sb)) {
return highlight_line(\@a, $pa, $sa),
highlight_line(\@b, $pb, $sb);
return highlight_line(\@a, $pa, $sa, \@OLD_HIGHLIGHT),
highlight_line(\@b, $pb, $sb, \@NEW_HIGHLIGHT);
}
else {
return join('', @a),
@@ -144,15 +165,30 @@ sub split_line {
}
sub highlight_line {
my ($line, $prefix, $suffix) = @_;
my ($line, $prefix, $suffix, $theme) = @_;
return join('',
@{$line}[0..($prefix-1)],
$HIGHLIGHT,
@{$line}[$prefix..$suffix],
$UNHIGHLIGHT,
@{$line}[($suffix+1)..$#$line]
);
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