[PATCH/RFC 3/4] contrib: contacts: add ability to parse from committish

@@ -3,7 +3,7 @@
 # List people who might be interested in a patch.  Useful as the argument to
 # git-send-email --cc-cmd option, and in other situations.
 #
-# Usage: git contacts <file> ...
+# Usage: git contacts <file | rev-list option> ...
 
 use strict;
 use warnings;

@@ -104,8 +104,32 @@ sub commits_from_patch {
 	close $f;
 }
 
+sub commits_from_rev_args {
+	my ($commits, $args) = @_;
+	open my $f, '-|', qw(git rev-list --reverse), @$args or die;
+	while (<$f>) {
+		chomp;
+		my $id = $_;
+		$seen{$id} = 1;
+		open my $g, '-|', qw(git show -C --oneline), $id or die;
+		scan_hunks($commits, $id, $g);
+		close $g;
+	}
+	close $f;
+}
+
+my (@files, @rev_args);
+for (@ARGV) {
+	if (-e) {
+		push @files, $_;
+	} else {
+		push @rev_args, $_;
+	}
+}
+
 my %commits;
-commits_from_patch(\%commits, $_) for (@ARGV);
+commits_from_patch(\%commits, $_) for (@files);
+commits_from_rev_args(\%commits, \@rev_args) if @rev_args;
 import_commits(\%commits);
 
 my %count_per_person;