git-notify: Make showing the committer optional

Only the author's name and address will now be mentioned in a commit
notification by default.  However, if the "-C" option is specified (or
"notify.showCommitter" is set), the committer's name and address will
also be included in the notification if the committer is not the author
of the commit (as we previously did by default).

tools/git-notify

@@ -15,6 +15,7 @@
 #
 # Usage: git-notify [options] [--] old-sha1 new-sha1 refname
 #
+#   -C        Show committer in the body if different from the author
 #   -c name   Send CIA notifications under specified project name
 #   -m addr   Send mail notifications to specified address
 #   -n max    Set max number of individual mails to send
@@ -49,6 +50,9 @@ my $debug = 0;
 
 # configuration parameters
 
+# show the committer if different from the author (can be set with the -C option)
+my $show_committer = git_config( "notify.showcommitter" );
+
 # base URL of the gitweb repository browser (can be set with the -u option)
 my $gitweb_url = git_config( "notify.baseurl" );
 
@@ -85,6 +89,7 @@ my @revlist_options;
 sub usage()
 {
     print "Usage: $0 [options] [--] old-sha1 new-sha1 refname\n";
+    print "   -C        Show committer in the body if different from the author\n";
     print "   -c name   Send CIA notifications under specified project name\n";
     print "   -m addr   Send mail notifications to specified address\n";
     print "   -n max    Set max number of individual mails to send\n";
@@ -265,6 +270,7 @@ sub parse_options()
         my $arg = shift @ARGV;
 
         if ($arg eq '--') { last; }
+        elsif ($arg eq '-C') { $show_committer = 1; }
         elsif ($arg eq '-c') { $cia_project_name = shift @ARGV; }
         elsif ($arg eq '-m') { $commitlist_address = shift @ARGV; }
         elsif ($arg eq '-n') { $max_individual_notices = shift @ARGV; }
@@ -432,7 +438,7 @@ sub send_commit_notice($$)
           "Branch: $ref",
           "Commit: $obj",
           "Author:" . $info{"author"},
-          $info{"committer"} ne $info{"author"} ? "Committer:" . $info{"committer"} : undef,
+          $show_committer && $info{"committer"} ne $info{"author"} ? "Committer:" . $info{"committer"} : undef,
           "Date:" . format_date($info{"author_date"},$info{"author_tz"}),
           $url ? "URL: $url" : undef),
           "",