#!/usr/bin/env python
# encoding: utf-8
# Michal Proszek, 2014 (poxip)

"""
Detect the version of Blender, path
and install the extension:

	def options(opt):
		opt.load('blender')
	def configure(cnf):
		cnf.load('blender')
	def build(bld):
		bld(name='io_mesh_raw',
			feature='blender',
			files=['file1.py', 'file2.py']
		)
If name variable is empty, files are installed in scripts/addons, otherwise scripts/addons/name
Use ./waf configure --system to set the installation directory to system path
"""
import os
import re
from sys import platform as _platform
from getpass import getuser

from waflib import Utils
from waflib.TaskGen import feature
from waflib.Configure import conf

def options(opt):
	opt.add_option(
		'-s', '--system',
		dest='directory_system',
		default=False,
		action='store_true',
		help='determines installation directory (default: user)'
	)

@conf
def find_blender(ctx):
	'''Return version number of blender, if not exist return None'''
	blender = ctx.find_program('blender')
	try:
		output = ctx.cmd_and_log(blender + ['--version'])
		m = re.search(r'Blender\s*((\d+(\.|))*)', output)
		blender_version = m.group(1)
	except Exception:
		ctx.fatal('Could not retrieve blender version')

	ctx.env['BLENDER_VERSION'] = blender_version
	return blender

@conf
def configure_paths(ctx):
	"""Setup blender paths"""
	# Get the username
	user = getuser()
	# Default: Linux
	config_path = {
		'user': '/home/%s/.config/blender/' % user,
		'system': '/usr/share/blender/'
	}
	if _platform == 'darwin':
		# MAC OS X
		config_path['user'] = \
			'/Users/%s/Library/Application Support/Blender/' % user
		config_path['system'] = '/Library/Application Support/Blender/'
	elif _platform == 'win32':
		# Windows
		appdata_path = ctx.getenv('APPDATA').replace('\\', '/')
		homedrive = ctx.getenv('HOMEDRIVE').replace('\\', '/')

		config_path['user'] = '%s/Blender Foundation/Blender/' % appdata_path
		config_path['system'] = \
			'%sAll Users/AppData/Roaming/Blender Foundation/Blender/' % homedrive

	blender_version = ctx.env['BLENDER_VERSION']

	config_path['user'] += blender_version + '/'
	config_path['system'] += blender_version + '/'

	ctx.env['BLENDER_CONFIG_DIR'] = os.path.abspath(config_path['user'])
	if ctx.options.directory_system:
		ctx.env['BLENDER_CONFIG_DIR'] = config_path['system']

	ctx.env['BLENDER_ADDONS_DIR'] = os.path.join(
		ctx.env['BLENDER_CONFIG_DIR'], 'scripts/addons'
	)
	Utils.check_dir(ctx.env['BLENDER_ADDONS_DIR'])

def configure(ctx):
	ctx.find_blender()
	ctx.configure_paths()

@feature('blender_list')
def blender(self):
	# Two ways to install a blender extension: as a module or just .py files
	dest_dir = os.path.join(self.env.BLENDER_ADDONS_DIR, self.get_name())
	Utils.check_dir(dest_dir)
	self.bld.install_files(
		dest_dir,
		getattr(self, 'files', '.')
	)

Create blender tool