read-token.py
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read-token.py
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	#!/usr/bin/env python3


	import json
	import os
	import sys


	# -------------------------------------------------------------
	# Parse Phabricator configuration
	# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

	def get_phabricator_configuration_path():
	candidates = [
	os.environ["HOME"] + "/.arcrc",
	"/usr/local/etc/arcrc",
	"/etc/arcrc",
	]

	for candidate in candidates:
	if os.path.exists(candidate):
	return candidate

	raise FileNotFoundError("Can't find Arc configuration")


	def get_token(phabricator_url):
	config_path = get_phabricator_configuration_path()

	with open(config_path) as fd:
	config = json.load(fd)

	for instance, args in config.get("hosts", {}).items():
	if phabricator_url in instance:
	return args["token"]

	raise RuntimeError(
	f"{config_path} doesn't describe host {phabricator_url}")


	# -------------------------------------------------------------
	# Application entry point
	# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -


	def run(phabricator_url):
	token = get_token(phabricator_url)
	print(token)


	if __name__ == "__main__":
	try:
	phabricator_url_fragment = sys.argv[1]
	except IndexError:
	print("Usage:", sys.argv[0],
	"<Phabricator instance URL>", file=sys.stderr)
	sys.exit(2)

	run(phabricator_url_fragment)