configure

#!/usr/bin/env python
import optparse
import json
import os, os.path
import sys

if __name__ == '__main__' :
	os.chdir(os.path.abspath(os.path.dirname(__file__)))

	parser = optparse.OptionParser()
	parser.add_option('-v', '--virtualenv', dest='virtualenv', help='path to the virtualenv to use', default=os.environ.get('VIRTUAL_ENV', None))
	parser.add_option('-d', '--working-dir', dest='working_dir', help='directory to store sockets and logs in.', default=os.path.abspath(os.path.dirname(__file__)))
	parser.add_option('-c', '--code-dir', dest='code_dir', help='directory to store the code (git checkout) in. generally will be this directory. no real installation is done.', default=os.path.abspath(os.path.dirname(__file__)))
	parser.add_option('-f', action='store_true', dest='force', default=False, help='needed if not the first run of configure that succeeds; force overwrite of configuration.')

	opts, args = parser.parse_args()

	if not opts.virtualenv :
		print '-v argument is required.'
		sys.exit(1)

	assert os.path.exists(opts.virtualenv)
	assert os.path.exists(opts.working_dir)
	assert os.path.exists(opts.code_dir)

	out_opts = {
		'virtualenv' : opts.virtualenv,
		'working_dir' : opts.working_dir,
		'code_dir' : opts.code_dir,
	}

	def printout(d) :
		for k,v in d.items() :
			print k.ljust(20, '.') + v

	if os.path.exists('configure.json') and not opts.force :
		print 'existing config, use -f to force overwrite:'
		printout(json.load(open('configure.json')))
		print 'not configured.'
		sys.exit(1)

	print 'writing config:'
	printout(out_opts)

	fh = open('configure.json', 'w')
	json.dump(out_opts, fh)
	fh.close()