git-svn: color support for the log command

 * match LESS environment settings to those in pager.c
 * parse diff.color and pager.color settings in the
   config file, and pass --color to git-log
 * --color and --pager= settings are supported

Signed-off-by: Eric Wong <normalperson@yhbt.net>
Signed-off-by: Junio C Hamano <junkio@cox.net>

diff --git a/git-svn.perl b/git-svn.perl
index c3ad5ec..d8d8716 100755 (executable)
--- a/git-svn.perl
+++ b/git-svn.perl
@@ -60,6 +60,7 @@ nag_lib() unless $_use_lib;
 my $_optimize_commits = 1 unless $ENV{GIT_SVN_NO_OPTIMIZE_COMMITS};
 my $sha1 = qr/[a-f\d]{40}/;
 my $sha1_short = qr/[a-f\d]{4,40}/;
+my $_esc_color = qr/(?:\033\[(?:(?:\d+;)*\d*)?m)*/;
 my ($_revision,$_stdin,$_no_ignore_ext,$_no_stop_copy,$_help,$_rmdir,$_edit,
        $_find_copies_harder, $_l, $_cp_similarity, $_cp_remote,
        $_repack, $_repack_nr, $_repack_flags, $_q,
@@ -68,7 +69,8 @@ my ($_revision,$_stdin,$_no_ignore_ext,$_no_stop_copy,$_help,$_rmdir,$_edit,
        $_limit, $_verbose, $_incremental, $_oneline, $_l_fmt, $_show_commit,
        $_version, $_upgrade, $_authors, $_branch_all_refs, @_opt_m,
        $_merge, $_strategy, $_dry_run, $_ignore_nodate, $_non_recursive,
-       $_username, $_config_dir, $_no_auth_cache, $_xfer_delta);
+       $_username, $_config_dir, $_no_auth_cache, $_xfer_delta,
+       $_pager, $_color);
 my (@_branch_from, %tree_map, %users, %rusers, %equiv);
 my ($_svn_co_url_revs, $_svn_pg_peg_revs);
 my @repo_path_split_cache;
@@ -135,6 +137,8 @@ my %cmd = (
                          'show-commit' => \$_show_commit,
                          'non-recursive' => \$_non_recursive,
                          'authors-file|A=s' => \$_authors,
+                         'color' => \$_color,
+                         'pager=s' => \$_pager,
                        } ],
        'commit-diff' => [ \&commit_diff, 'Commit a diff between two trees',
                        { 'message|m=s' => \$_message,
@@ -759,16 +763,17 @@ sub show_log {
                }
        }
 
+       config_pager();
        my $pid = open(my $log,'-|');
        defined $pid or croak $!;
        if (!$pid) {
                exec(git_svn_log_cmd($r_min,$r_max), @args) or croak $!;
        }
-       setup_pager();
+       run_pager();
        my (@k, $c, $d);
 
        while (<$log>) {
-               if (/^commit ($sha1_short)/o) {
+               if (/^${_esc_color}commit ($sha1_short)/o) {
                        my $cmt = $1;
                        if ($c && cmt_showable($c) && $c->{r} != $r_last) {
                                $r_last = $c->{r};
@@ -777,25 +782,25 @@ sub show_log {
                        }
                        $d = undef;
                        $c = { c => $cmt };
-               } elsif (/^author (.+) (\d+) ([\-\+]?\d+)$/) {
+               } elsif (/^${_esc_color}author (.+) (\d+) ([\-\+]?\d+)$/) {
                        get_author_info($c, $1, $2, $3);
-               } elsif (/^(?:tree|parent|committer) /) {
+               } elsif (/^${_esc_color}(?:tree|parent|committer) /) {
                        # ignore
-               } elsif (/^:\d{6} \d{6} $sha1_short/o) {
+               } elsif (/^${_esc_color}:\d{6} \d{6} $sha1_short/o) {
                        push @{$c->{raw}}, $_;
-               } elsif (/^[ACRMDT]\t/) {
+               } elsif (/^${_esc_color}[ACRMDT]\t/) {
                        # we could add $SVN->{svn_path} here, but that requires
                        # remote access at the moment (repo_path_split)...
-                       s#^([ACRMDT])\t#   $1 #;
+                       s#^(${_esc_color})([ACRMDT])\t#$1   $2 #;
                        push @{$c->{changed}}, $_;
-               } elsif (/^diff /) {
+               } elsif (/^${_esc_color}diff /) {
                        $d = 1;
                        push @{$c->{diff}}, $_;
                } elsif ($d) {
                        push @{$c->{diff}}, $_;
-               } elsif (/^    (git-svn-id:.+)$/) {
+               } elsif (/^${_esc_color}    (git-svn-id:.+)$/) {
                        ($c->{url}, $c->{r}, undef) = extract_metadata($1);
-               } elsif (s/^    //) {
+               } elsif (s/^${_esc_color}    //) {
                        push @{$c->{l}}, $_;
                }
        }
@@ -901,12 +906,30 @@ sub cmt_showable {
        return defined $c->{r};
 }
 
+sub log_use_color {
+       return 1 if $_color;
+       my $dc;
+       chomp($dc = `git-repo-config --get diff.color`);
+       if ($dc eq 'auto') {
+               if (-t *STDOUT || (defined $_pager &&
+                   `git-repo-config --bool --get pager.color` !~ /^false/)) {
+                       return ($ENV{TERM} && $ENV{TERM} ne 'dumb');
+               }
+               return 0;
+       }
+       return 0 if $dc eq 'never';
+       return 1 if $dc eq 'always';
+       chomp($dc = `git-repo-config --bool --get diff.color`);
+       $dc eq 'true';
+}
+
 sub git_svn_log_cmd {
        my ($r_min, $r_max) = @_;
        my @cmd = (qw/git-log --abbrev-commit --pretty=raw
                        --default/, "refs/remotes/$GIT_SVN");
        push @cmd, '-r' unless $_non_recursive;
        push @cmd, qw/--raw --name-status/ if $_verbose;
+       push @cmd, '--color' if log_use_color();
        return @cmd unless defined $r_max;
        if ($r_max == $r_min) {
                push @cmd, '--max-count=1';
@@ -2533,14 +2556,18 @@ sub tz_to_s_offset {
        return ($1 * 60) + ($tz * 3600);
 }
 
-sub setup_pager { # translated to Perl from pager.c
-       return unless (-t *STDOUT);
-       my $pager = $ENV{PAGER};
-       if (!defined $pager) {
-               $pager = 'less';
-       } elsif (length $pager == 0 || $pager eq 'cat') {
-               return;
+# adapted from pager.c
+sub config_pager {
+       $_pager ||= $ENV{GIT_PAGER} || $ENV{PAGER};
+       if (!defined $_pager) {
+               $_pager = 'less';
+       } elsif (length $_pager == 0 || $_pager eq 'cat') {
+               $_pager = undef;
        }
+}
+
+sub run_pager {
+       return unless -t *STDOUT;
        pipe my $rfd, my $wfd or return;
        defined(my $pid = fork) or croak $!;
        if (!$pid) {
@@ -2548,8 +2575,8 @@ sub setup_pager { # translated to Perl from pager.c
                return;
        }
        open STDIN, '<&', $rfd or croak $!;
-       $ENV{LESS} ||= '-S';
-       exec $pager or croak "Can't run pager: $!\n";;
+       $ENV{LESS} ||= 'FRSX';
+       exec $_pager or croak "Can't run pager: $! ($_pager)\n";
 }
 
 sub get_author_info {