Wladimir Braguini wlads

Capybara Actions

# Anchor
click_link 'Save'

# Button
click_button 'awesome'

# Both above

How to Setup Verified Commits

Quick guide on how to setup git signing. Information is aggregated from following sources:

Dunnet Guide

First, you start with this command in CMD / Bash--

emacs -batch -l dunnet

--and then you get this prompt.

Technical details for https://stackoverflow.com/a/44169445/6730571

Details of investigation:

On a base system, /usr/bin/java is a symlink that points to /System/Library/Frameworks/JavaVM.framework/Versions/Current/Commands/java, which is an Apple wrapper tool that locates and executes the actual java.

(Do not touch anything in those 2 system directories. It should actually be impossible due to "System Integrity Protection" anyway.)

If you don't have Java installed, attempting to execute java will open a dialog that invites you to install it.

React lifecycle cheatsheet

Method	Side effects¹	State updates²	Example uses
Mounting
`componentWillMount`		✓	Constructor equivalent for `createClass`
`render`			Create and return element(s)
`componentDidMount`	✓	✓	DOM manipulations, network requests, etc.
Updating
`componentWillReceiveProps`		✓	Update `state` based on changed `props`

ffmpeg

Converting Audio into Different Formats / Sample Rates

Minimal example: transcode from MP3 to WMA:
ffmpeg -i input.mp3 output.wma

You can get the list of supported formats with:
ffmpeg -formats

Convert WAV to MP3, mix down to mono (use 1 audio channel), set bit rate to 64 kbps and sample rate to 22050 Hz:

	# gem list -i -e 'debug' -v '>= 1.0.0'
	# -i returns true / false
	# -e exact match (avoid partial match), could also be a regex e.g. '^debug$'
	# -v specify gem version (may also use pessimistic version)

	function check_ruby_debug() {
	debug_gem_installed=$(gem list -i -e "debug" -v ">= 1.0.0")
	if [[ $debug_gem_installed = "false" ]]; then
	echo -e "Ruby's debug gem not installed!"
	echo -e "run: gem install debug"

	# I find this https://discussions.apple.com/thread/8160651
	# but it not match my 2018 version MacBook with macos 10.14
	#
	# On my local, gpuswitch value is
	# 0 -> does not use dedicated graphics
	# 1 -> use dedicated graphics
	# 2 -> switch automaticly (I guess), because 2 is default value when "automatic graphics switching" selected
	# in energy in preference.

	# check settings depended on charger/battery

	function listFolders(folder) {
	var sheet = SpreadsheetApp.getActiveSheet();
	sheet.appendRow(["Name", "Sharing Access", "Sharing Permission", "Get Editors", "Get Viewers", "Date", "Size", "URL", "Download", "Description", "Type"]); //writes the headers

	//var folder = DriveApp.getFolderById("INSERT_YOUR_FILE_ID");//that long chunk of random numbers/letters in the URL when you navigate to the folder
	//getLooseFiles(folder, sheet);
	//getSubFolders(folder, sheet);

	//instead of getting folder by ID rather get all folders and cycle through each. Note this will miss loose files in parent directory.
	var folder = DriveApp.getFolders()

	#!/usr/bin/env bash

	JDKS_DIR="/Library/Java/JavaVirtualMachines"
	JDKS=( $(ls ${JDKS_DIR}) )
	JDKS_STATES=()

	# Map state of JDK
	for (( i = 0; i < ${#JDKS[@]}; i++ )); do
	if [[ -f "${JDKS_DIR}/${JDKS[$i]}/Contents/Info.plist" ]]; then
	JDKS_STATES[${i}]=enable