Kyle Rames krames

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.

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

All of the course material is open source and available here. I took the 3 day language class. You can find the agenda here.

Slices of slices behave a little differently than I expected.

	function parse_git_dirty {
	[[ $(git status 2> /dev/null \| tail -n1) != "nothing to commit (working directory clean)" ]] && echo "*"
	}
	function parse_git_branch {
	git branch --no-color 2> /dev/null \| sed -e '/^[^]/d' -e "s/ \(.*\)/[\1$(parse_git_dirty)]/"
	}

	function proml {
	case $TERM in
	xterm*)

	1.9.3:knife-rackspace [master]$ git config --add remote.upstream.fetch "+refs/pull//head:refs/remotes/upstream/pr/"
	1.9.3:knife-rackspace [master]$ git fetch upstream
	remote: Counting objects: 481, done.
	remote: Compressing objects: 100% (223/223), done.
	remote: Total 393 (delta 191), reused 309 (delta 113)
	Receiving objects: 100% (393/393), 45.29 KiB, done.
	Resolving deltas: 100% (191/191), completed with 20 local objects.
	From https://github.com/opscode/knife-rackspace
	* [new ref] refs/pull/0/head -> upstream/pr/0
	* [new ref] refs/pull/1/head -> upstream/pr/1

	require "lifx" # http://www.rubydoc.info/gems/lifx

	def calculate_color(i) # 0 <= i <= 1
	h = [40 * 2 * i, 40].min # will be 40 (yellow) at i=1/2 and stay there
	s = 1.0 - [(i - 0.5) * 2, 0].max # will be 1 until i=1/2 and then go down to 0
	b = i
	LIFX::Color.hsbk(h, s, b, LIFX::Color::KELVIN_MIN)
	end

	duration = 10 * 60 # seconds