install_ruby_packages

#!/usr/bin/env python3
#
# Install Ruby modules in the install_ruby_packages.gemfile Gemfile.

import sys
import subprocess
import shutil


def emulate_run(args, env=None):
    p = subprocess.Popen(args, env=env)
    if p.wait() == 0:
        return True
    return False


def emulate_backtick(args):
    try:
        output = subprocess.check_output(args, universal_newlines=True).rstrip('\n')
    except Exception:
        output = ''

    return output


ruby = shutil.which('ruby')
gem = shutil.which('gem')
if not gem and sys.platform.startswith('win32'):
    gem = shutil.which('gem.bat')
if not gem and sys.platform.startswith('win32'):
    gem = shutil.which('gem.cmd')
if not gem and sys.platform.startswith('win32'):
    gem = 'gem.cmd'

if __name__ == '__main__':
    if not ruby:
        print('error: Ruby not installed, not installing Ruby packages.')
        sys.exit(1)

    if not gem:
        print('error: gem is not available, skipping Ruby module installation')
        sys.exit(1)

    error = not emulate_run([gem, 'install', '--user-install', '--update-sources', '--file', 'install_ruby_packages.gemfile'])

    sys.exit(1 if error else 0)