#!/usr/bin/env python3
#pylint: disable=C0111
# config example (cmd_pre and cmd_post are optional):
# ---
# name: test
# cmd_pre:
#   - [/usr/bin/notify_send, 'I am precmd1!']
#   - [/usr/bin/notify_send, 'I am precmd2!']
# multicmd:
#   selection1:
#     - [/usr/bin/notify-send, 'I am command1 for selection1!']
#     - [/usr/bin/notify-send, 'I am command2 for selection1!']
#   selection2:
#     - [/usr/bin/notify-send, 'I am command1 for selection2!']
# cmd_post:
#   - [/usr/bin/notify_send, 'I am postcmd1!']
#   - [/usr/bin/notify_send, 'I am postcmd2!']
# ---
import subprocess
import sys
import yaml


def run_cmd(cmd, stdin=subprocess.PIPE, data=None):
    proc = subprocess.Popen(
        cmd, stdout=subprocess.PIPE, stderr=subprocess.PIPE, stdin=stdin
    )
    stdout, stderr = (i.strip() for i in proc.communicate(data))
    if proc.returncode:
        err_msg = ['ERROR (' + str(proc.returncode) + '): ' + ' '.join(cmd)]
        if stdout:
            err_msg.append('out:\n' + stdout.decode('UTF-8'))
        if stderr:
            err_msg.append('err:\n' + stderr.decode('UTF-8'))
        sys.stderr.write('\n'.join(err_msg) + '\n')
    return stdout


def run_multicmd(cmds):
    for cmd in cmds:
        run_cmd(cmd)


def main():
    config_path = sys.argv[1]
    with open(config_path, mode='r') as config:
        conf = yaml.load(config.read())
    dmenu_cmd = ['/usr/bin/dmenu', '-p', conf.get('name', 'N/A')] + sys.argv[2:]
    dmenu_opt = '\n'.join(conf['multicmd']).encode()
    selection = run_cmd(dmenu_cmd, data=dmenu_opt).decode('UTF-8')
    if not selection in conf['multicmd']:
        sys.exit(1)
    run_multicmd(conf.get('cmd_pre', tuple()))
    run_multicmd(conf['multicmd'][selection])
    run_multicmd(conf.get('cmd_post', tuple()))

if __name__ == '__main__':
    main()