wteuber’s gists

wteuber / check_namespaces.rb

Last active May 30, 2025 14:53

Ruby namespace checker

	#!/usr/bin/env ruby
	# frozen_string_literal: true

	# Example usage:
	# ./check_namespaces.rb
	# for dir in */; do (cd "$dir" && ../check_namespaces.rb); done
	# ./check_namespaces.rb path/to/test/
	# ls -d components//test/ \| xargs ./check_namespaces.rb

	require "prism"

wteuber / ruby_value_omission.sh

Last active November 18, 2024 17:36

Apply Ruby's keyword argument and hash value omission in a git repo

	# https://gist.github.com/wteuber/c435bafcd79beb91b65e354fc907efe8
	# macOS/zsh

	# Apply Ruby's keyword argument and hash value omission in a git repo

	# First occurence only
	git grep -lP '\b([A-Za-z0-9_]+): \1\b[,\)]' -- '*.rb' \| head -1 \| xargs -I {} sed -i -E 's/\b([A-Za-z0-9_]+): \1\b([,\)])/\1:\2/g' "{}"

	# Apply for "<var>: <var>," and "<var>: <var>)"
	git grep -lP '\b([A-Za-z0-9_]+): \1\b[,\)]' -- '*.rb' \| xargs -I {} sed -i -E 's/\b([A-Za-z0-9_]+): \1\b([,\)])/\1:\2/g' "{}"

wteuber / generate_random_bitmaps.sh

Last active November 13, 2024 18:13

random bitmap generator

	#!/bin/bash

	# Usage: ./generate_random_bitmaps.sh <width> <height> <color> <entropy>
	# Example ./generate_random_bitmaps.sh 100 100 red 0.8

	# Default dimensions
	WIDTH=${1:-100}
	HEIGHT=${2:-100}
	PIXELS=$((WIDTH * HEIGHT))

wteuber / number_of_words_in_git_repo.sh

Created August 14, 2024 18:24

number of words in git repo

git ls-files | xargs wc -w 2> /dev/null | ruby -e "puts ARGF.map{_1.scan(/^\s*(\d+)/)[0][0].to_i}.inject(&:+)"

wteuber / mp4_to_gif.sh

Created August 14, 2024 10:38

mp4 to gif

ffmpeg -i "My Movie.mp4" -vf "fps=10,scale=320:-1:flags=lanczos" -c:v pam -f image2pipe - | convert -delay 10 - -loop 0 -layers optimize output.gif

wteuber / list_unique_prs_for_search_term.sh

Created August 13, 2024 18:27

List unique PRs for search_term

	export PAGER="cat"
	git --no-pager log -S'search_term' --source --all --pretty=format:'%H' \| xargs -I {} gh pr list --search "{}" --state merged --json url -q '.[].url' \| sort -u

wteuber / mysql_table_stats.sql

Last active July 1, 2024 15:09

List MySQL tables, their respective row count and size.

	SELECT
	table_name AS `Table`,
	table_rows AS `Row Count`,
	ROUND(data_length + index_length) AS `Size (Bytes)`,
	CASE
	WHEN data_length + index_length < 1024 THEN CONCAT(ROUND((data_length + index_length), 2), ' B')
	WHEN data_length + index_length < 1024 * 1024 THEN CONCAT(ROUND((data_length + index_length) / 1024, 2), ' KB')
	WHEN data_length + index_length < 1024 * 1024 * 1024 THEN CONCAT(ROUND((data_length + index_length) / 1024 / 1024, 2), ' MB')
	WHEN data_length + index_length < 1024 * 1024 * 1024 * 1024 THEN CONCAT(ROUND((data_length + index_length) / 1024 / 1024 / 1024, 2), ' GB')
	ELSE CONCAT(ROUND((data_length + index_length) / 1024 / 1024 / 1024 / 1024, 2), ' TB')

wteuber / volume.md

Last active February 3, 2024 21:50

FFmpeg - Audio Volume Manipulation

Audio Volume Manipulation

ffmpeg -i input.mp4 -af "volume=<volume_level>" output.mp4

input.mp4: The input video file.
-af: Stands for audio filter. This option tells FFmpeg to apply an audio filter.

wteuber / reduce_pdf.sh

Last active January 14, 2026 16:22 — forked from knugie/reduce_pdf.sh

reduce pdf size

	#!/usr/bin/env bash


	# Reduce PDF size - http://www.alfredklomp.com/programming/shrinkpdf/
	# -dPDFSETTINGS
	# /screen
	# /ebook
	# /printer
	# /prepress

wteuber / install_eventmachine.md

Created September 26, 2023 10:01

MacOS M1 installing eventmachine (1.2.7)

An error occurred while installing eventmachine (1.2.7), and Bundler cannot continue.
Make sure that `gem install eventmachine -v '1.2.7' --source 'https://rubygems.org/'` succeeds before bundling.

In Gemfile:
  github-pages was resolved to 228, which depends on
    jekyll-avatar was resolved to 0.7.0, which depends on
      jekyll was resolved to 3.9.3, which depends on
        em-websocket was resolved to 0.5.3, which depends on
 eventmachine

Wolfgang Teuber wteuber