#!/usr/bin/env python

# Usage:
# Either copy into a shell script build phase 
# (don't forget to change the interpreter to "/usr/bin/env python")
# Or just put it into a shell script and call it form there.
#
# Discussion:
# There are really two info plist keys that could be used for the source revision:
# The CFBundleShortVersionString and CFBundleVersion
# Apple recommends to use CFBundleVersion, because it is not shown in the finders info dialog,
# but is shown in the standard about dialog of a cocoa application where the CFBundleVersion
# is shown in parantheses behind the CFBundleShortVersionString.
#
# Inspired by Daniel Jalkut at http://www.red-sweater.com/blog/23/automatic-build-sub-versioning-in-xcode
# License: Creative-Commons Public Domain http://creativecommons.org/licenses/publicdomain/

import os, re, plistlib

# Test if run from xcode
is_run_from_xcode = os.environ.has_key("BUILT_PRODUCTS_DIR")
if not is_run_from_xcode:
    exit("Needs to be run from a Xcode shell scribt build phase")

# We take the one from the built products dir to keep revision numbers out of the repository
info_plist_path = os.path.join(os.environ["BUILT_PRODUCTS_DIR"], \
                               os.environ["INFOPLIST_PATH"])

# get latest svn revision
def output_of_command(*command_and_arguments):
    import subprocess
    return subprocess.Popen(command_and_arguments, stdout=subprocess.PIPE).communicate()[0]

os.chdir(os.environ["PROJECT_DIR"])
version_range = output_of_command("svnversion", "-nc")
latest_commited_version = re.search(r"\d*\w*$", version_range).group(0)

# enter into Info.plist
info = plistlib.readPlist(info_plist_path)
info["CFBundleVersion"] = latest_commited_version
plistlib.writePlist(info, info_plist_path)