[PATCH 2/2] Let git-add--interactive read colors from .gitconfig

[Dan Zwell <dzwell@zwell.net>]

>From ad3c6a2f015197a72d85039783a63a24c19f7017 Mon Sep 17 00:00:00 2001
From: Dan Zwell <dzwell@zwell.net>
Date: Mon, 22 Oct 2007 16:08:01 -0500
Subject: [PATCH] Let git-add--interactive read colors from .gitconfig

Colors are specified in color.interactive.{prompt,header,help}.
They are specified as git color strings as described in the
documentation. The method color_to_ansi_string() in Git.pm parses
these strings and returns ANSI color codes (using
Term::ANSIColor).

Signed-off-by: Dan Zwell <dzwell@zwell.net>
---
One thought is that is seems a bit sloppy to call "require Term::ANSIColor"
within color_to_ansi_code(), but I can't really see a better way. After all,
that is where the methods from that library are really needed. And I don't
know why Git.pm should need to know whether color will end up being used.

 Documentation/config.txt  |    7 +++++
 git-add--interactive.perl |   22 ++++++++++++-----
 perl/Git.pm               |   56 ++++++++++++++++++++++++++++++++++++++++++++-
 3 files changed, 77 insertions(+), 8 deletions(-)

diff --git a/Documentation/config.txt b/Documentation/config.txt
index 2fd783f..ade3399 100644
--- a/Documentation/config.txt
+++ b/Documentation/config.txt
@@ -388,6 +388,13 @@ color.interactive::
 	`auto`, use colors only when the output is to the
 	terminal. Defaults to false.
 
+color.interactive.<slot>::
+	Use customized color for `git add --interactive`
+	output. `<slot>` may be `prompt`, `header`, or `help`, for
+	three distinct types of normal output from interactive
+	programs.  The values of these variables may be specified as
+	in color.branch.<slot>.
+
 color.pager::
 	A boolean to enable/disable colored output when the pager is in
 	use (default is true).
diff --git a/git-add--interactive.perl b/git-add--interactive.perl
index 16dc7b0..2bce5a1 100755
--- a/git-add--interactive.perl
+++ b/git-add--interactive.perl
@@ -1,18 +1,26 @@
 #!/usr/bin/perl -w
 
 use strict;
+use Git;
 
 my ($use_color, $prompt_color, $header_color, $help_color, $normal_color);
 my $color_config = qx(git config --get color.interactive);
 if ($color_config=~/true|always/ || -t STDOUT && $color_config=~/auto/) {
-	require Term::ANSIColor;
-
 	$use_color = "true";
-	# Sane (visible) defaults:
-	$prompt_color = Term::ANSIColor::color("blue bold");
-	$header_color = Term::ANSIColor::color("bold");
-	$help_color   = Term::ANSIColor::color("red bold");
-	$normal_color = Term::ANSIColor::color("reset");
+	# Grab the 3 main colors in git color string format, with sane
+	# (visible) defaults:
+	my $repo = Git->repository();
+	my $git_prompt_color =
+		Git::config($repo, "color.interactive.prompt")||"bold blue";
+	my $git_header_color =
+		Git::config($repo, "color.interactive.header")||"bold";
+	my $git_help_color =
+		Git::config($repo, "color.interactive.help")||"red bold";
+
+	$prompt_color = Git::color_to_ansi_code($git_prompt_color);
+	$header_color = Git::color_to_ansi_code($git_header_color);
+	$help_color   = Git::color_to_ansi_code($git_help_color);
+	$normal_color = Git::color_to_ansi_code("normal");
 }
 
 sub print_colored {
diff --git a/perl/Git.pm b/perl/Git.pm
index 3f4080c..9100e0b 100644
--- a/perl/Git.pm
+++ b/perl/Git.pm
@@ -515,7 +515,6 @@ sub config {
 	};
 }
 
-
 =item config_bool ( VARIABLE )
 
 Retrieve the bool configuration C<VARIABLE>. The return value
@@ -550,6 +549,61 @@ sub config_bool {
 }
 
 
+=item color_to_ansi_code ( COLOR )
+
+Converts a git-style color string, like "underline blue white" to
+an ANSI color code. The code is generated by Term::ANSIColor,
+after the string is parsed into the format that is accepted by
+that module. Used as follows:
+
+	print color_to_ansi_code("underline blue white");
+	print "some text";
+	print color_to_ansi_code("normal");
+
+=cut
+
+sub color_to_ansi_code {
+	my ($git_string) = @_;
+	my @ansi_words;
+	my %attrib_mappings = (
+		"bold"    => "bold",
+		"ul"      => "underline",
+		"blink"   => "blink",
+		# not supported:
+		#"dim"     => "",
+		"reverse" => "reverse"
+	);
+	my ($fg_done, $word);
+
+	foreach $word (split /\s+/, $git_string) {
+		if ($word =~ /normal/) {
+			$fg_done = "true";
+		}
+		elsif ($word =~ /black|red|green|yellow/ ||
+			   $word =~ /blue|magenta|cyan|white/) {
+			# is a color.
+			if ($fg_done) {
+				# this is the background
+				push @ansi_words, "on_" . $word;
+			}
+			else {
+				# this is foreground
+				$fg_done = "true";
+				push @ansi_words, $word;
+			}
+		}
+		else {
+			# this is an attribute, not a color.
+			if ($attrib_mappings{$word}) {
+				push(@ansi_words,
+					 $attrib_mappings{$word});
+			}
+		}
+	}
+	require Term::ANSIColor;
+	return Term::ANSIColor::color(join(" ", @ansi_words)||"reset");
+}
+
 =item ident ( TYPE | IDENTSTR )
 
 =item ident_person ( TYPE | IDENTSTR | IDENTARRAY )
-- 
1.5.3.5.474.g3e4bb