ranger plugin: update gnu screen's working directory whenever the current directory in ranger changes

ranger-screen.py

import os
import ranger.api
import subprocess

# https://github.com/ranger/ranger/wiki/Signals-and-Hooks
def ranger_signal_bind(signal_name):
    def decorate(handler):
        old_hook_ready = ranger.api.hook_ready
        def hook_ready(fm):
            fm.notify('%s %r' % (signal_name, handler))
            fm.signal_bind(signal_name, handler)
            return old_hook_ready(fm)
        ranger.api.hook_ready = hook_ready
    return decorate

# triggered in ranger/core/tab.py
@ranger_signal_bind('cd')
def cd_handler(params):
    if os.environ['TERM'].startswith('screen'):
        subprocess.call(['screen', '-X', 'chdir', params['new'].path])