wteuber

# gem install icalendar
require 'icalendar'

# Open a file or pass a string to the parser
cal_file = File.open("/path/to/my_large_calendar.ics")

# Parser returns an array of calendars because a single file
# can have multiple calendars.
cals = Icalendar::Calendar.parse(cal_file)
cal = cals.first

wteuber

#!/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

# 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

#!/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

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

wteuber

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

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

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

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 size
#-dPDFSETTINGS
#  /screen
#  /ebook
#  /printer
#  /prepress

gs -dNOPAUSE -dBATCH -sDEVICE=pdfwrite -dCompatibilityLevel=1.4 -dPDFSETTINGS=/printer -sOutputFile=out.pdf in.pdf