[PATCH v4 2/2] gitweb: introduce localtime feature

[Kevin Cernekee <cernekee@gmail.com>]

With this feature enabled, all timestamps are shown in the local
timezone instead of GMT.  The timezone is taken from the appropriate
timezone string stored in the commit object.

This improves usability if the majority of a project's contributors are
based in a single office, all within the same timezone.  It also makes
the interface more friendly to non-developers who may need to track
updates, such as program managers and supervisors.

This change does not affect relative timestamps (e.g. "5 hours ago"),
nor does it affect 'patch' and 'patches' views which already use
localtime because they are generated by "git format-patch".

Affected views include:
* 'summary' view, "last change" field (commit time from latest change)
* 'log' view, author time
* 'commit' and 'commitdiff' views, author/committer time
* 'tag' view, tagger time

In the case of 'commit', 'commitdiff' and 'tag' views, gitweb used to
print both GMT time and time in timezone of author/tagger/committer:

   Fri, 18 Mar 2011 01:28:57 +0000 (18:28 -0700)

With localtime enabled, the times will be swapped:

   Thu, 17 Mar 2011 18:28:57 -0700 (01:28 +0000)

Local times between 00:00 and 05:59, inclusive, will still be printed
in red ("atnight" style) in these views.

Signed-off-by: Kevin Cernekee <cernekee@gmail.com>
Signed-off-by: Jakub Narebski <jnareb@gmail.com>
---
 gitweb/gitweb.perl |   87 ++++++++++++++++++++++++++++++++++++++-------------
 1 files changed, 65 insertions(+), 22 deletions(-)

diff --git a/gitweb/gitweb.perl b/gitweb/gitweb.perl
index 57ef08c..b3b7f3f 100755
--- a/gitweb/gitweb.perl
+++ b/gitweb/gitweb.perl
@@ -504,6 +504,19 @@ our %feature = (
 		'sub' => sub { feature_bool('remote_heads', @_) },
 		'override' => 0,
 		'default' => [0]},
+
+	# Use the author/commit localtime rather than GMT for all timestamps.
+	# Disabled by default.
+
+	# To enable system wide have in $GITWEB_CONFIG
+	# $feature{'localtime'}{'default'} = [1];
+	# To have project specific config enable override in $GITWEB_CONFIG
+	# $feature{'localtime'}{'override'} = 1;
+	# and in project config gitweb.localtime = 0|1;
+	'localtime' => {
+		'sub' => sub { feature_bool('localtime', @_) },
+		'override' => 0,
+		'default' => [0]},
 );
 
 sub gitweb_get_feature {
@@ -2919,6 +2932,10 @@ sub format_date {
 	$date{'hour_local'} = $hour;
 	$date{'minute_local'} = $min;
 	$date{'tz_local'} = $tz;
+	$date{'rfc2822_local'} = sprintf "%s, %d %s %4d %02d:%02d:%02d $tz",
+	                         $days[$wday], $mday, $months[$mon],
+	                         1900+$year, $hour ,$min, $sec;
+
 	$date{'iso-tz'} = sprintf("%04d-%02d-%02d %02d:%02d:%02d %s",
 	                          1900+$year, $mon+1, $mday,
 	                          $hour, $min, $sec, $tz);
@@ -3928,22 +3945,48 @@ sub git_print_section {
 	print $cgi->end_div;
 }
 
-sub print_local_time {
-	print format_local_time(@_);
-}
-
-sub format_local_time {
-	my $localtime = '';
-	my %date = @_;
-	if ($date{'hour_local'} < 6) {
-		$localtime .= sprintf(" (<span class=\"atnight\">%02d:%02d</span> %s)",
-			$date{'hour_local'}, $date{'minute_local'}, $date{'tz_local'});
+# Returns an RFC 2822 timestamp string, which may contain HTML.
+# If $use_localtime is 0, don't do anything special.
+# If $use_localtime is 1, add an alternate HH:MM timestamp in parentheses at
+# the end.  If $feature{'localtime'} is enabled this looks like:
+#   Thu, 17 Mar 2011 18:28:57 -0700 (01:28 +0000)
+# Otherwise, it looks like:
+#   Fri, 18 Mar 2011 01:28:57 +0000 (18:28 -0700)
+# If $use_localtime is 1, this will also apply the "atnight" style to
+# local times between 00:00 and 05:59.
+sub timestamp_html {
+	my %date = %{$_[0]};
+	my $use_localtime = $_[1];
+	my $timestamp;
+	my $alt_time;
+
+	if (gitweb_check_feature('localtime')) {
+		$timestamp = $date{'rfc2822_local'};
+		if ($use_localtime && $date{'hour_local'} < 6) {
+			$timestamp = "<span class=\"atnight\">" .
+			             $timestamp .
+			             "</span>";
+		}
+		$alt_time = sprintf(" (%02d:%02d %s)",
+		                    $date{'hour'}, $date{'minute'}, "+0000");
 	} else {
-		$localtime .= sprintf(" (%02d:%02d %s)",
-			$date{'hour_local'}, $date{'minute_local'}, $date{'tz_local'});
+		$timestamp = $date{'rfc2822'};
+		$alt_time = sprintf(" (%02d:%02d %s)",
+				    $date{'hour_local'},
+				    $date{'minute_local'},
+				    $date{'tz_local'});
+		if ($use_localtime && $date{'hour_local'} < 6) {
+			$alt_time = "<span class=\"atnight\">" .
+			            $alt_time .
+			            "</span>";
+		}
 	}
 
-	return $localtime;
+	if ($use_localtime) {
+		$timestamp .= $alt_time;
+	}
+
+	return $timestamp;
 }
 
 # Outputs the author name and date in long form
@@ -3956,10 +3999,9 @@ sub git_print_authorship {
 	my %ad = format_date($co->{'author_epoch'}, $co->{'author_tz'});
 	print "<$tag class=\"author_date\">" .
 	      format_search_author($author, "author", esc_html($author)) .
-	      " [$ad{'rfc2822'}";
-	print_local_time(%ad) if ($opts{-localtime});
-	print "]" . git_get_avatar($co->{'author_email'}, -pad_before => 1)
-		  . "</$tag>\n";
+	      " [" . timestamp_html(\%ad, 0) . "] ".
+	      git_get_avatar($co->{'author_email'}, -pad_before => 1) .
+	      "</$tag>\n";
 }
 
 # Outputs table rows containing the full author or committer information,
@@ -3983,9 +4025,9 @@ sub git_print_authorship_rows {
 		      git_get_avatar($co->{"${who}_email"}, -size => 'double') .
 		      "</td></tr>\n" .
 		      "<tr>" .
-		      "<td></td><td> $wd{'rfc2822'}";
-		print_local_time(%wd);
-		print "</td>" .
+		      "<td></td><td> " .
+		      timestamp_html(\%wd, 1) .
+		      "</td>" .
 		      "</tr>\n";
 	}
 }
@@ -5395,8 +5437,9 @@ sub git_summary {
 	print "<table class=\"projects_list\">\n" .
 	      "<tr id=\"metadata_desc\"><td>description</td><td>" . esc_html($descr) . "</td></tr>\n" .
 	      "<tr id=\"metadata_owner\"><td>owner</td><td>" . esc_html($owner) . "</td></tr>\n";
-	if (defined $cd{'rfc2822'}) {
-		print "<tr id=\"metadata_lchange\"><td>last change</td><td>$cd{'rfc2822'}</td></tr>\n";
+	if (keys %cd) {
+		print "<tr id=\"metadata_lchange\"><td>last change</td><td>" .
+		      timestamp_html(\%cd, 0) . "</td></tr>\n";
 	}
 
 	# use per project git URL list in $projectroot/$project/cloneurl
-- 
1.7.4.1