perf/aggregate: use Getopt::Long for option parsing

When passing an option '--foo' that it does not recognize, the
aggregate.perl script should die with an helpful error message
like:

Unknown option: foo
./aggregate.perl [options] [--] [<dir_or_rev>...] [--] \
[<test_script>...] >

  Options:
    --codespeed          * Format output for Codespeed
    --reponame    <str>  * Send given reponame to codespeed
    --sort-by     <str>  * Sort output (only "regression" \
criteria is supported)

rather than:

  fatal: Needed a single revision
  rev-parse --verify --foo: command returned error: 128

To implement that let's use Getopt::Long for option parsing
instead of the current manual and sloppy parsing. This should
save some code and make option parsing simpler, tighter and
safer.

This will avoid something like 'foo--sort-by=regression' to
be handled as if '--sort-by=regression' had been used, for
example.

As Getopt::Long eats '--' at the end of options, this changes
a bit the way '--' is handled as we can now have '--' both
after the options and before the scripts.

Signed-off-by: Christian Couder <chriscool@tuxfamily.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

t/perf/aggregate.perl

@@ -4,6 +4,7 @@ use lib '../../perl/build/lib';
 use strict;
 use warnings;
 use JSON;
+use Getopt::Long;
 use Git;
 
 sub get_times {
@@ -36,46 +37,34 @@ sub format_times {
 	return $out;
 }
 
+sub usage {
+	print <<EOT;
+./aggregate.perl [options] [--] [<dir_or_rev>...] [--] [<test_script>...] >
+
+  Options:
+    --codespeed          * Format output for Codespeed
+    --reponame    <str>  * Send given reponame to codespeed
+    --sort-by     <str>  * Sort output (only "regression" criteria is supported)
+    --subsection  <str>  * Use results from given subsection
+
+EOT
+	exit(1);
+}
+
 my (@dirs, %dirnames, %dirabbrevs, %prefixes, @tests,
     $codespeed, $sortby, $subsection, $reponame);
+
+Getopt::Long::Configure qw/ require_order /;
+
+my $rc = GetOptions("codespeed"     => \$codespeed,
+		    "reponame=s"    => \$reponame,
+		    "sort-by=s"     => \$sortby,
+		    "subsection=s"  => \$subsection);
+usage() unless $rc;
+
 while (scalar @ARGV) {
 	my $arg = $ARGV[0];
 	my $dir;
-	if ($arg eq "--codespeed") {
-		$codespeed = 1;
-		shift @ARGV;
-		next;
-	}
-	if ($arg =~ /--sort-by(?:=(.*))?/) {
-		shift @ARGV;
-		if (defined $1) {
-			$sortby = $1;
-		} else {
-			$sortby = shift @ARGV;
-			if (! defined $sortby) {
-				die "'--sort-by' requires an argument";
-			}
-		}
-		next;
-	}
-	if ($arg eq "--subsection") {
-		shift @ARGV;
-		$subsection = $ARGV[0];
-		shift @ARGV;
-		if (! $subsection) {
-			die "empty subsection";
-		}
-		next;
-	}
-	if ($arg eq "--reponame") {
-		shift @ARGV;
-		$reponame = $ARGV[0];
-		shift @ARGV;
-		if (! $reponame) {
-			die "empty reponame";
-		}
-		next;
-	}
 	last if -f $arg or $arg eq "--";
 	if (! -d $arg) {
 		my $rev = Git::command_oneline(qw(rev-parse --verify), $arg);
@@ -225,7 +214,8 @@ sub print_sorted_results {
 	my ($sortby) = @_;
 
 	if ($sortby ne "regression") {
-		die "only 'regression' is supported as '--sort-by' argument";
+		print "Only 'regression' is supported as '--sort-by' argument\n";
+		usage();
 	}
 
 	my @evolutions;