Hi!

I really like the idea of colorizing git add -i, especially the
prompt.  Here are my two cents.

Wincent Colaiuta wrote:
quoted text
> +sub print_ansi_color($$;$) {
> +    my $color = shift;
> +    my $string = shift;
> +    my $trailer = shift;

None of the other subs in this file have a prototype, so for
consistency I'd suggest to not add it on this function either.
However maybe a patch that adds it to all subs would be welcome.
(I wouldn't see the necessity though.)

And the common way of getting the arguments is reading @_ (see all
other subs in the file).  So maybe instead write:

[...]
sub print_ansi_color {
	my ($color, $string, $trailer) = @_;
[...]

quoted text
> +    if ($use_color) {
> +        printf '%s%s%s', Term::ANSIColor::color($color), $string,
> +            Term::ANSIColor::color('clear');
> +    } else {

Why use printf when you could directly use print here?  It's only
used for concatenating.

quoted text
> +    if ($trailer) {
> +        print $trailer;
> +    }

This will fail to print $trailer when $trailer happens to be a
string that evaluates to false in bool context, like '0'.  Write
this as:

	if (defined $trailer) {
	    print $trailer;
	}

IMHO, parsing the output of 'git diff-files --color' is a very bad
idea and it makes all regexes uglier and more difficult to read.
You're much better off recolorizing it yourself, which makes it a
more localized change.  Especially, I don't think that you have
any guarantee that escape sequences won't ever contain the
characters '+', '-' or ' ' (space), which would break your code on
lines like this:

quoted text
> +        if ($line =~ /^[^-+ ]*\+/) { 

Finally -- and this might be just my eyes -- blue is a very nice
color, but it looks a bit too dark on black background.  Maybe
choose a default color that looks reasonable on black *and* white
background.

Cheers,
jlh
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