i3_window_switcher.py

#!/usr/bin/env python2

import re
import subprocess
import json


def get_windows(node):
    windows = []
    for n in node['nodes']:
        if n['nodes']:
            windows += get_windows(n)
        else:
            windows.append(n['name'])

    return windows


def main():
    stdout = subprocess.check_output('i3-msg -t get_tree', shell=True)
    js = json.loads(stdout)
    windows = []
    windows += get_windows(js['nodes'][1]['nodes'][1])
    window_list = '\n'.join(windows).encode('utf-8')
    p = subprocess.Popen('dmenu -i', stdout=subprocess.PIPE, stdin=subprocess.PIPE, stderr=subprocess.STDOUT, shell=True)
    window = p.communicate(input=window_list)[0]
    window = re.escape(window.strip())
    cmdline = 'i3-msg "[title=\\"%s\\"] focus"' % window
    subprocess.call(cmdline, shell=True, stdout=subprocess.PIPE)


if __name__ == '__main__':
    main()