#!/usr/bin/python

# Copyright 2012 Paul Wise
# Released under the MIT/Expat license, see doc/COPYING

# Creates a configuration snippet for Planet Debian derivatives based on the
# logo head and RSS feed files for the blogs of all the derivatives.
#
# Usage:
# derivative-to-planet-config <shortname> <long name file> <rss feed files x2> <logo head file> <planet config>

import os
import sys
try: import Image
except ImportError: pass
from tempfile import NamedTemporaryFile as tempfile

override = sys.argv[3] + '.override'
override_dev = sys.argv[4] + '.override'
name = sys.argv[1].strip()
longname = sys.argv[2]
blogs_rss = override if os.path.exists(override) else sys.argv[3]
blogs_dev_rss = override_dev if os.path.exists(override_dev) else sys.argv[4]
head = sys.argv[5]
config = sys.argv[6]

try:
	f = open(longname)
	longname = f.read().split('\n')[0].strip()
	longname_dev = longname + ' developers'
	f.close()
except IOError:
	longname = None
	longname_dev = None

try:
	head = Image.open(head)
except (NameError, IOError):
	head = None

try:
	f = open(config)
	old_config = f.read()
	f.close()
except IOError:
	old_config = None

def config_snippet(rss, name, longname, head):
	rss = rss.strip()
	if rss and not (set('[]#\n') & set(rss)):
		ret = ['[%s]' % rss]
		if longname:
			ret.append('name = %s' % longname)
		if head:
			ret.append('face = deriv/%s' % name)
		if head:
			ret.append('facewidth = %s' % head.size[0])
			ret.append('faceheight = %s' % head.size[1])
		ret.append('')
		return ret
	else:
		return None

new_config = []

try:
	rf = open(blogs_rss)
	feeds = [config_snippet(line,name, longname, head) for line in rf]
	new_config += [feed for feed in feeds if feed]
	rf.close()
except IOError:
	pass

try:
	rf = open(blogs_dev_rss)
	feeds = [config_snippet(line,name, longname_dev, head) for line in rf]
	new_config += [feed for feed in feeds if feed]
	rf.close()
except IOError:
	pass

new_config = ['\n'.join(feed) for feed in new_config]
new_config = '\n'.join(new_config)

if new_config and new_config != old_config:
	tmp = tempfile(prefix=config+'.tmp.', dir='', delete=False)
	tmp.write(new_config)
	tmp.close()
	dummy = open(tmp.name+'.dummy','w')
	dummy.close()
	os.chmod(tmp.name, os.stat(dummy.name).st_mode)
	os.remove(dummy.name)
	os.rename(tmp.name, config)