import virtualenv, textwrap

recipe = textwrap.dedent('''
import os, subprocess, sys

win32 = """
We require Python 2.5.1. You can download it here:

http://www.python.org/ftp/python/2.5.1/python-2.5.1.msi
"""

darwin = """
We require Python 2.5.1. You can download a Universal build here:

http://www.python.org/ftp/python/2.5.1/python-2.5.1-macosx.dmg 
"""

other = """
We require Python 2.5.1. This version of Python is often available in
your operating system's native package format (via apt-get or yum, for
instance). You can also easily build Python from source on Unix-like
systems. Here is the source download link for Python:

http://www.python.org/ftp/python/2.5.1/Python-2.5.1.tar.bz2
"""

def extend_parser(optparse_parser):
	pass

def set_bin_dir(home_dir):
	global bin_dir, easy_install
	if sys.platform == 'win32':
		bin_dir = join(home_dir, 'Scripts')
		# We have to run the script explicitly because easy_install sets its exe to require admin
		# privs on Vista. We don't actually need such privs, so we avoid the elevation.
		easy_install = 'easy_install-script.py'
	else:
		bin_dir = join(home_dir, 'bin')
		easy_install = 'easy_install'

def run_bin_executable(prog, *args):
	cmd = [join(bin_dir, prog)]
	cmd.extend(args)
	subprocess.call(cmd)

def run_py_script(*args):
	run_bin_executable('python', *args)

def inst_package(package, *args):
	run_py_script(join(bin_dir, easy_install), package, *args)

def check_python():
	if sys.version_info < (2,5):
		if sys.platform == "darwin":
			print darwin
		elif sys.platform == "win32":
			print win32
		else:
			print other
		return False
	else:
		return True

def after_install(options, home_dir):
	if not check_python():
		sys.exit()
	set_bin_dir(home_dir)
	if sys.platform == "win32":
		inst_package('pywin32')
	inst_package('--editable', '-b', home_dir, 'chardb==dev')
	proj_root = join(home_dir, 'chardb', 'chardb')
	os.chdir(proj_root)
	run_py_script('setup.py', 'develop')
	run_py_script('setup.py', 'nuke')
''')

open('devel.py', 'w').write(virtualenv.create_bootstrap_script(recipe))