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/*** Native messaging "ping_pong" example in C.
 *
 *  It is reimplementation of the corresponding Python example from
 *  https://github.com/mdn/webextensions-examples/tree/master/native-messaging
 *
 *    # Python 3.x version
 *    # Read a message from stdin and decode it.
 *    def getMessage():
 *        rawLength = sys.stdin.buffer.read(4)
 *        if len(rawLength) == 0:

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/*.json
/*.xml

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#!/usr/bin/env python3
"""
- read subprocess output without threads using a socket pair
- show the output in a tkinter GUI (while the process is still running)
- stop subprocess on a button press
"""
import logging
import os
import socket
import sys

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#!/usr/bin/env python3
"""Send telegrams about new videos on subscribed YouTube channels.

To try it, install dependencies:

  $ python3 -mpip install aiohttp feedparser werkzeug

run the callback server:

  $ env TELEBOT_TOKEN=<token> TELEBOT_CHAT_ID=<chat_id> python3 ytcallback-server.py

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#!/usr/bin/env python3
"""Closed formula (safe_position3(n)) for Josephus3 problem for 1<=n<2**31"""
from decimal import Decimal, getcontext, localcontext


def safe_position3(n, *, precision=getcontext().prec):
    # [jos]: http://user.math.uzh.ch/halbeisen/publications/pdf/jos.pdf
    # j(n, k, n - l) = (n - c_m) * k + d_m;
    # c_m <= n < c_m_plus_1
    # return j(n, 3, n) + 1;

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#!/usr/bin/env python3
"""Draw text in the center of the screen."""
import sys

from PyQt5.QtCore import Qt
from PyQt5.QtGui import QFont
from PyQt5.QtWidgets import QApplication, QLabel

app = QApplication(sys.argv)
w = QLabel()

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#!/usr/bin/env python
"""Play Youtube video on remote VLC.

Usage: play-youtube-video-on-remote-vlc <webpage-url>

Send media url to remote (desktop) VLC using (Lua) http interface
https://wiki.videolan.org/VLC_HTTP_requests/
"""
import base64
import os

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/** Convert Roman numerals given on the command line to decimals.

  $ ragel -F0 -o roman_numerals.c roman_numerals.rl
  $ gcc -finput-charset=utf-8 -fexec-charset=utf-8 -o roman_numerals roman_numerals.c
  $ ./roman_numerals IX Ⅻ CCCC
  9
  12
  400
  $ ./roman_numerals IIX && exit 1 || echo invalid
  invalid

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/scheme.png

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# $ grako -o kv_parser.py KV.ebnf

@@grammar :: KV

# whitespace inside a string excluding the start/end of the line
@@whitespace :: /((?!^)(?![\r\n])\s)+/
@@eol_comments :: /#[^\r\n]*/
@@left_recursion :: False

# input is zero or more assignments