readline: various tweaks

[~bandali/configs] / .local / bin / my-i3status

#!/usr/bin/env python2
# -*- coding: utf-8 -*-

# This script is a simple wrapper which prefixes each i3status line with custom
# information. It is based on:
# https://github.com/i3/i3status/blob/master/contrib/wrapper.py
#
# In ~/.i3status.conf, add the following line:
#     output_format = "i3bar"
# in the 'general' section.
# Then, in ~/.config/i3/config or ~/.config/sway/config add:
#     status_command i3status | my-i3status.py
# in the 'bar' section.  Make sure my-i3status.py is in $PATH.
#
# © 2012 Valentin Haenel <valentin.haenel@gmx.de>
# © 2018 Amin Bandali <bandali@gnu.org>
#
# This program is free software. It comes without any warranty, to the extent
# permitted by applicable law. You can redistribute it and/or modify it under
# the terms of the Do What The Fuck You Want To Public License (WTFPL), Version
# 2, as published by Sam Hocevar. See http://sam.zoy.org/wtfpl/COPYING for more
# details.

import sys
import json
import os

def get_nosleep():
    """ Return true if ~/.nosleep exists. """
    return os.path.isfile(os.path.expanduser("~/.nosleep"))

def print_line(message):
    """ Non-buffered printing to stdout. """
    sys.stdout.write(message + '\n')
    sys.stdout.flush()

def read_line():
    """ Interrupted respecting reader for stdin. """
    # try reading a line, removing any extra whitespace
    try:
        line = sys.stdin.readline().strip()
        # i3status sends EOF, or an empty line
        if not line:
            sys.exit(3)
        return line
    # exit on ctrl-c
    except KeyboardInterrupt:
        sys.exit()

if __name__ == '__main__':
    # Skip the first line which contains the version header.
    print_line(read_line())

    # The second line contains the start of the infinite array.
    print_line(read_line())

    while True:
        line, prefix = read_line(), ''
        # ignore comma at start of lines
        if line.startswith(','):
            line, prefix = line[1:], ','

        if get_nosleep():
            j = json.loads(line)
            # insert information into the start of the json, but could be anywhere
            j.insert(0, {'full_text' : '•', 'name' : 'nosleep'})
            # and echo back new encoded json
            print_line(prefix+json.dumps(j))
        else:
            print_line(prefix+line)