Chris McDevitt minimal

Update May 2017

Eric Bidelman has documented some of the common workflows possible with headless Chrome over in https://developers.google.com/web/updates/2017/04/headless-chrome.

Update

If you're looking at this in 2016 and beyond, I strongly recommend investigating real headless Chrome: https://chromium.googlesource.com/chromium/src/+/lkgr/headless/README.md

Windows and Mac users might find using Justin Ribeiro's Docker setup useful here while full support for these platforms is being worked out.

OS X Screencast to animated GIF

This gist shows how to create a GIF screencast using only free OS X tools: QuickTime, ffmpeg, and gifsicle.

Instructions

To capture the video (filesize: 19MB), using the free "QuickTime Player" application:

A little Clojure configuration reader

This is a handy bit of code I've written more than once. I thought I'd throw it in here so I can refer back to it later. Basically, it lets you read a config file to produce a Clojure map. The config files themselves can contain one or more forms, each of which can be either a map or a list. Maps are simply merged. Lists correspond to invocations of extension points, which in turn produces a map, which is merged along with everything else.

An Example

Consider the following files:

names.edn

	/**
	* ReactJS: JavaScript like you've always done it.
	*
	* This example renders your top ten most followed friends/followers, `filter`ing
	* only your favorites, and putting a star on all verified accounts.
	*
	* With ReactJS, any time your data changes, the UI is always brought up to date
	* automatically. If friends length changes, or followCount - it always shows what
	* `render` describes.
	*/

	(defn debounce
	([c ms] (debounce (chan) c ms))
	([c' c ms]
	(go
	(loop [start nil loc (<! c)]
	(if (nil? start)
	(do
	(>! c' loc)
	(recur (js/Date.) nil))
	(let [loc (<! c)]

	#!/usr/bin/env zsh

	# This script prints a bell character when a command finishes
	# if it has been running for longer than $zbell_duration seconds.
	# If there are programs that you know run long that you don't
	# want to bell after, then add them to $zbell_ignore.
	#
	# This script uses only zsh builtins so its fast, there's no needless
	# forking, and its only dependency is zsh and its standard modules
	#

	# put this in your .bash_profile
	if [ $ITERM_SESSION_ID ]; then
	export PROMPT_COMMAND='echo -ne "\033];${PWD##*/}\007"; ':"$PROMPT_COMMAND";
	fi

	# Piece-by-Piece Explanation:
	# the if condition makes sure we only screw with $PROMPT_COMMAND if we're in an iTerm environment
	# iTerm happens to give each session a unique $ITERM_SESSION_ID we can use, $ITERM_PROFILE is an option too
	# the $PROMPT_COMMAND environment variable is executed every time a command is run
	# see: ss64.com/bash/syntax-prompt.html

	// Steve Phillips / elimisteve
	// 2013.01.03

	// Programming Challenge: Launch 4 threads, goroutines, coroutines, or whatever your language uses for concurrency,
	// in addition to the main thread. In the first 3, add numbers together (see sample code below) and pass the results
	// to the 4th thread. That 4th thread should receive the 3 results, add the numbers together, format the results as
	// a string (see sample code), and pass the result back to `main` to be printed.
	//
	// Do this as succinctly and readably as possible. _Go!_ #golang #programming #concurrency #challenge
	package main