#!/usr/bin/env ruby

# Copyright (c) 2015 Frank Fischer <frank-fischer@shadow-soft.de>
#
# This program is free software: you can redistribute it and/or
# modify it under the terms of the GNU General Public License as
# published by the Free Software Foundation, either version 3 of the
# License, or (at your option) any later version.
#
# This program is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
# General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see  <http://www.gnu.org/licenses/>


# This script releases a new (minor) stable release given that some
# new commits on the stable branch since the last tag exist.

Dir.chdir File.dirname(__FILE__)

def die(msg = "Failed")
	STDERR.puts msg
	exit 1
end

def run(cmd)
	system(cmd) or die(cmd)
end

run 'hg pull'
run 'hg update -r stable'

tag = `hg tags`.split("\n").select{|line| line =~ /^\d+\.\d+\.\d+/}.map do |line|
	tag, rev = line.split
	major, minor, tiny = tag.split(/\./).map(&:to_i)
	[major, minor, tiny, rev[/\d+/].to_i]
end.max

tag or die 'No tagged revision found'

stable = `hg log -r 'branch(stable) and not file("../.hgtags") and not ..tag("re:\\d+\\.\\d+\\.\\d+")' | wc -l`.to_i != 0

if stable
	new_tag = "#{tag[0]}.#{tag[1]}.#{tag[2]+1}"
	run "make -C .. nversion VERSION='#{new_tag}'"
	run "hg commit -m 'update version to #{new_tag}'"
	run "hg tag -m 'version #{new_tag}' -r stable #{new_tag}"
	run "hg push -r stable"
end