perlPackages.TextDiff
  perlPackages.FileSlurp

use Text::Diff;
use File::Slurp;

	$diff .= `(cd $clonePath ; hg log -r $rev1:$rev2)`;

	$diff .= `(cd $clonePath ; hg log -r $rev1 -r $rev2 -b $branch)`;

sub readNormalizedLog {
    my ($file) = @_;
    my $res = read_file($file);

    $res =~ s/\/nix\/store\/[a-z0-9]*-/\/nix\/store\/...-/g;
    $res =~ s/nix-build-[a-z0-9]*-/nix-build-...-/g;
    $res =~ s/[0-9]{2}:[0-9]{2}:[0-9]{2}/00:00:00/g;
    return $res;
}
sub logdiff : Chained('api') PathPart('logdiff') Args(2) {
    my ($self, $c, $buildid1, $buildid2) = @_;
    my $diff = "";
    my $build1 = getBuild($c, $buildid1);
    notFound($c, "Build with ID $buildid1 doesn't exist.")
        if !defined $build1;
    my $build2 = getBuild($c, $buildid2);
    notFound($c, "Build with ID $buildid2 doesn't exist.")
        if !defined $build2;
    if (-f $build1->resultInfo->logfile && -f $build2->resultInfo->logfile) {
        my $logtext1 = readNormalizedLog($build1->resultInfo->logfile);
        my $logtext2 = readNormalizedLog($build2->resultInfo->logfile);
        $diff = diff \$logtext1, \$logtext2;
    } else {
        $c->response->status(404);
    }
    $c->stash->{'plain'} = { data => (scalar $diff) || " " };
    $c->forward('Hydra::View::Plain');
}

        , uri_for('API', 'logdiff', [],"*", "*")

            [% IF build.resultInfo.buildstatus != 0 && prevSuccessfulBuild %]

            Changes compared to last successful build:<br/>

                    [% IF prevSuccessfulBuild && firstBrokenBuild && firstBrokenBuild.id != build.id %]<th>First broken build <tt>[% INCLUDE renderDateTime timestamp = firstBrokenBuild.timestamp %]</tt></th>[% END %]
                    <th>This build <tt>[% INCLUDE renderDateTime timestamp = build.timestamp %]</tt></th>

                    [% IF prevSuccessfulBuild && firstBrokenBuild && firstBrokenBuild.id != build.id %]
                        <th>First broken build <tt>[% INCLUDE renderDateTime timestamp = firstBrokenBuild.timestamp %]</tt><br/>
                            <tt>[ <a href="[% c.uri_for(c.controller('API').action_for('logdiff') prevSuccessfulBuild.id firstBrokenBuild.id ) %]">log diff</a> ]</tt>
                        </th>
                    [% END %]
                    <th>This build <tt>[% INCLUDE renderDateTime timestamp = build.timestamp %]</tt> <br/>
                        <tt>[ <a href="[% c.uri_for(c.controller('API').action_for('logdiff') prevSuccessfulBuild.id build.id) %]">log diff</a> ]</tt>
                    </th>

            [% END %]