#!/bin/sh
# git-touch - timestamp files by their last touching Git commit date

# from Andreas Schwab, <87bo0olebe.fsf@igel.home>, $gmane/239150

git log --name-only --format=format:%n%ct -- "$@" |
perl -e 'my $do_date = 0; chomp(my $cdup = `git rev-parse --show-cdup`);
  while (<>) {
    chomp;
    if ($do_date) {
      next if ($_ eq "");
      die "Unexpected $_\n" unless /^[0-9]+$/;
      $d = $_;
      $do_date = 0;
    } elsif ($_ eq "") {
      $do_date = 1;
    } elsif (!defined($seen{$_})) {
      $seen{$_} = 1;
      utime $d, $d, "$cdup$_";
    }
  }'