#!/usr/bin/python2
# -*- mode: python; coding: utf-8 -*-
#
# Most of this code was stolen from Waf which is:
# Thomas Nagy, 2005-2010
# Copyright © 2011, 2016 Jonas Smedegaard <dr@jones.dk>
# Adapted for CDBS purposes by Rémi Thebault <remi.thebault@gmail.com>
#
# 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, 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/>.

usage = '''

  python waf-unpack --waf=WAF_FILE --dest=DEST_FOLDER

      Unpacks the WAF_FILE structure into DEST_FOLDER destination'''


import sys, os
from optparse import OptionParser


C1='#*'
C2='#&'
cwd = os.getcwd()
join = os.path.join

WAF='waf'
def b(x):
	return x

if sys.hexversion>0x300000f:
	WAF='waf3'
	def b(x):
		return x.encode()

def err(m):
	print(('\033[91mError: %s\033[0m' % m))
	sys.exit(1)



def unpack_waf (waf, dest):
	f = open(waf,'rb')
	c = "corrupted waf (%d)"
	while 1:
		line = f.readline()
		if not line: err("run waf-light from a folder containing wafadmin")
		if line == b('#==>\n'):
			txt = f.readline()
			if not txt: err(c % 1)
			if f.readline()!=b('#<==\n'): err(c % 2)
			break
	if not txt: err(c % 3)
	txt = txt[1:-1].replace(b(C1), b('\n')).replace(b(C2), b('\r'))

	import shutil, tarfile
	try: shutil.rmtree(dest)
	except OSError: pass
	try:
		for x in ['Tools', '3rdparty']:
			os.makedirs(join(dest, 'wafadmin', x))
	except OSError:
		err("Cannot unpack waf lib into %s\nMove waf into a writeable directory" % dest)

	os.chdir(dest)
	tmp = 't.bz2'
	t = open(tmp,'wb')
	t.write(txt)
	t.close()

	t = None
	try:
		t = tarfile.open(tmp)
	except:
		try:
			os.system('bunzip2 t.bz2')
			t = tarfile.open('t')
		except:
			os.chdir(cwd)
			try: shutil.rmtree(dest)
			except OSError: pass
			err("Waf cannot be unpacked, check that bzip2 support is present")

	for x in t: t.extract(x)
	t.close()

	for x in ['Tools', '3rdparty']:
		os.chmod(join('wafadmin',x), 493)

	if sys.hexversion>0x300000f:
		sys.path = [join(dest, 'wafadmin')] + sys.path
		import py3kfixes
		py3kfixes.fixdir(dest)

	os.chdir(cwd)


if __name__ == '__main__':
	parser = OptionParser(usage)
	#parser.add_option('-h', '--help', action='store_true', dest='help', default=False, help='Print this help and exits')
	parser.add_option('-w', '--waf', action='store', dest='waf', help='The Waf file structure', metavar='WAF_FILE')
	parser.add_option('-d', '--dest', action='store', dest='dest', help='The destination folder. Created if needed', metavar='DEST_FOLDER')

	(options, args) = parser.parse_args()

	if not options.waf and not options.dest:
		print '--waf and --dest options are mandatory'
		parser.print_help()
		sys.exit(1) 

	print 'Unpacking ' + options.waf + ' to ' + options.dest + ' ...'
	unpack_waf(options.waf, options.dest)
	print 'Done'