David Kasakaitis ddkasa

Validating a Hex Value

/^#?([a-f0-9]{6}|[a-f0-9]{3})$/

Summary

A Regular expression, or Regex, is a method of validating a specific piece of text by use of a sequence of characters each including their own fundimental principles. Regex can be used to validate emails, hex values, URLs, and HTML. In this case we will be focusing on Hex values which are typically a # with 6 numbers or letters following it.

Note: many newer Keychron keyboards use QMK as firmware and most tips here do not apply to them. Maybe the ones related to Bluetooth can be useful, but everything related to Apple's keyboard module (hid_apple) on Linux, won't work. As far as I know, all QMK-based boards use the hid_generic module instead. Examples of QMK-based boards are: Q, Q-Pro, V, K-Pro, etc.

Most of these commands have been tested on Ubuntu 20.04 and should also work on most Debian-based distributions. If a command happens not to work for you, take a look in the comment section.

Make Fn + F-keys work (NOT FOR QMK-BASED BOARDS)

Older Keychron keyboards (those not based on QMK) use the hid_apple driver on Linux, even in the Windows/Android mode, both in Bluetooth and Wired modes.

Integrates:

The code below displays a single paginated table with a simple filter.

Inspired by this article

Calibre Server on Linux

Introduction

Calibre is a powerful cross-platform, open source, ebook manager and editing platform. Its calibre-server component can be used to publish an e-book library on a local network. While you can launch calibre-server as a desktop application, it can also be run as a daemon on a headless Linux server.

This tutorial on setting up calibre-server using Ubuntu 14.04 is very good, but dated.

	import subprocess
	import re
	import sys


	def get_pks_repoquery():
	# Use repoquery to create a list of userinstalled packages
	return set(subprocess.check_output(
	'dnf repoquery --userinstalled --qf "%{name}"', shell=True, text=True
	).splitlines())

	from typing import Union, List
	from dataclasses import dataclass


	class Validations:
	def __post_init__(self):
	"""Run validation methods if declared.

	The validation method can be a simple check
	that raises ValueError or a transformation to

	#!/usr/bin/env bash

	# rbw git-credential helper
	# Based on https://github.com/lastpass/lastpass-cli/blob/master/contrib/examples/git-credential-lastpass

	# A credential helper for git to retrieve usernames and passwords from rbw.
	# For general usage, see https://git-scm.com/docs/gitcredentials.
	# Here's a quick version:
	# 1. Put this somewhere in your path.
	# 2. git config --global credential.helper rbw

	"""
	This is an adjusted version of the official simpletreemodel[1] that adds lazy loading and uses a dict as backend.

	Instead of the dict it could also use a database or similar. Items are only loaded when expanded, which allows
	for speedy startup-time, even with 2.5m items.

	1: https://github.com/baoboa/pyqt5/tree/master/examples/itemviews/simpletreemodel
	"""

	import sys

	# Credit for this: Nicholas Swift
	# as found at https://medium.com/@nicholas.w.swift/easy-a-star-pathfinding-7e6689c7f7b2
	from warnings import warn
	import heapq

	class Node:
	"""
	A node class for A* Pathfinding
	"""