preetpalS’s gists

preetpalS / rails_pg_backup.rb

Last active June 20, 2021 05:30

Command line app that wraps PostgreSQL commands for backup and restore of either your entire database or only its data (written in Ruby using standard library without any external gems).

	#!/usr/bin/env ruby

	require 'date'
	require 'optparse'
	require 'ostruct'

	# TODO: Add quoting for file option/argument
	# TODO: See if using 'pathname' stdlib could improve code.

	# Rails PostgreSQL database backup helper application

preetpalS / scale_win10_uwp_assets.rb

Last active November 7, 2016 00:04

Windows 10 UWP quick-and-dirty scaled image asset generation with ImageMagick


	## Instructions
	# 1. Place this file (modified appropriately with your paths) in folder with images to be scaled.
	# 2. Run this file with Ruby (e.g. "ruby scale_win10_uwp_assets.rb").

	## Results
	# Creates a folder named "compiled_images" with scaled images.

	## Notes
	# You should create appropriate versions of your assets for different uses (and their scales and/or targets).

preetpalS / prime_encoding_maximums.rb

Created May 23, 2016 00:10

Calculations of how many primes can be encoded into a product for fixed-width integer types.


	# Contains utilities for working with Prime numbers.
	class Prime
	class << self
	def prime?(n)
	return false if n < 2
	return true if n < 4
	return false if n.even?

	(3..(Math.sqrt n).ceil).each do \|i\|

preetpalS / leftpad_numeric_filenames_with_zeros.rb

Created June 25, 2016 00:59

Script to left pad numeric filenames with leading 0's


	require 'pathname'

	DIRECTORIES_TO_IGNORE = ['.git']
	EXTENSIONS_TO_IGNORE = [ # not implemented
	/^.git*$/,
	'.DS_Store'
	].freeze
	MINIMUM_WIDTH = 3
	MOVE_COMMAND = ->(current_path, destination_path) {

preetpalS / dotenv-mode.el

Last active October 30, 2019 22:11

An Emacs major mode for .env files

	;;; dotenv-mode.el --- Major mode for .env files -- lexical-binding: t; --

	;; Author: Preetpal S. Sohal
	;; URL: https://github.com/preetpalS/emacs-dotenv-mode
	;; Version: 0.2.5
	;; Package-Requires: ((emacs "24.3"))
	;; License: GNU General Public License Version 3

	;; This program is free software; you can redistribute it and/or modify
	;; it under the terms of the GNU General Public License as published by

preetpalS / problemB.rb

Created April 9, 2017 10:04

tidy numbers

	#!/usr/bin/env ruby

	require 'set'

	def is_tidy(n)
	narr = n.to_s.split('')
	snarr = narr.sort
	narr.join('') == snarr.join('')
	end

preetpalS / fast_directory_delete.bat

Last active August 4, 2017 06:34

Windows Fast Directory Delete (Batch File)


	:: See https://superuser.com/a/289399 for more information on performance of approach.
	@echo off
	echo Windows Fast Directory Delete
	echo Deleting directory: %1
	echo Deleting files (within %1) recursively...
	del /F/S/Q %1 > nul
	echo Deleting directory (%1) recursively...
	rmdir /S/Q %1
	echo Process complete.

preetpalS / handle_sigbreak_on_windows.rb

Created May 6, 2018 05:59

Handling SIGBREAK signals with existing SIGINT signal handlers on Windows in Ruby


	# Sets up clean SIGBREAK signal handling on Windows by taking advantage of existing
	# SIGINT signal handlers.
	(-> {
	Signal.trap(21) do
	raise SignalException, 'INT'
	end
	}).call if Gem.win_platform?

preetpalS / random_password_generator.rb

Last active November 16, 2018 14:23

Simple command line random password generator (Ruby)

	#!/usr/bin/env ruby

	require 'optparse'
	require 'ostruct'

	class RandomPasswordGenerator
	VERSION = %w(0.1.0)

	CORE_CHARACTER_SET = [('a'..'z').to_a,
	('A'..'Z').to_a,

preetpalS / openssl-notes.txt

Created May 4, 2020 09:52 — forked from tsaarni/openssl-notes.txt

Generate self-signed certs with different key types

	*** RSA

	# Generate self-signed certificate with RSA 4096 key-pair
	openssl req -x509 -nodes -days 3650 -newkey rsa:4096 -keyout rsakey.pem -out rsacert.pem

	# print private and public key
	openssl rsa -in rsakey.pem -text -noout

	# print certificate
	openssl x509 -in rsacert.pem -text -noout

Preetpal Sohal preetpalS