#!/usr/bin/perl

use strict;
use Getopt::Long;
my $opt_force;
GetOptions("force" => \$opt_force) or die "Usage: make-release [-f] <version>";

my $version = shift or die "Usage: make-release <version>";

die "Not being run from root of Camlistore" unless -e ".git" && -e "pkg/blob/ref.go";

my $cur_branch = `git rev-parse --abbrev-ref HEAD`;
chomp $cur_branch;
die "Not on master" unless $cur_branch eq "master";

my $new_branch = "releases/$version";

if ($opt_force) {
    system("git", "tag", "-d", $version);
    system("git", "branch", "-D", $new_branch);
}

system("git", "checkout", "-b", $new_branch) and die "Failed to create branch $new_branch from master. Does it already exist?";

open(my $fh, ">VERSION") or die;
print $fh "$version\n";
close($fh);

system("git", "add", "VERSION") and die;
system("git", "commit", "-m", "Add VERSION file on the $new_branch branch.") and die "Failed to commit";
system("git", "tag", $version) and die "Failed to tag";

my $commit = do { open(my $f, ".git/refs/tags/$version") or die; local $/; <$f> };
chomp $commit;

system("git", "checkout", "master") and die;
open(my $fh, ">>misc/release-history-tags");
print $fh "$commit\t$version\n";
close($fh);

print "Created branch $new_branch from master, cleaned it and wrote VERSION file, & tagged $version.\n";
print "\n";
print "Push with:\n";
print "\$ git push github refs/tags/$version:refs/tags/$version\n";
print "\$ git push github $new_branch:$new_branch\n";