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Edit File : diff-highlight \| Size : 7.11 KB
#!/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; Back

Edit File : diff-highlight | Size : 7.11 KB

#!/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;

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