Joey Liaw jl

Notes on Grand Central Dispatch

This document assumes ARC and Obj-C as of iOS 6.1 and Xcode 4.6.

In Obj-C, GCD will automatically retain objects, including self. In C++, you have to do this yourself for EVERY non-copied object referenced by a dispatch_async block.

#include <memory>
class Foo : std::enable_shared_from_this<Foo> {

When you install MacVim, you have the option of installing command line integration. This basically puts an mvim shell script somewhere in your path, usually /usr/local/bin/mvim. Git has a list of mergetools that it knows about; gvimdiff is in the list, which expects gvim to be in the path.

First, figure out where your mvim script lives, then add a gvim link.

$ which mvim
/usr/local/bin/mvim
$ cd /usr/local/bin
$ ln -s mvim gvim
$ ls -l gvim

Mac OS X

install virtualbox
install vagrant
download CentOS 7 minimal ISO
create a new virtualbox instance "centos7base"
- 512 mb ram
- VDI, dynamically allocated, 8 gb
- disable USB and audio controllers
insert the centos 7 iso into the virtual drive

ProggyFont on MacVim

Text looks beautiful on MacBook Retina displays. You can use pretty much any monospace font, anti-aliased, and it will be quite readable for coding on your laptop's screen at 220 ppi. However, if you attach something with less than half that density, for example, the 93 ppi Dell U2414H (23.8" diagonal 1920 x 1200) then you get mushy fonts again.

Below are instructions for installing a pixel-perfect bitmap font which will give you back crisp text on both the external and internal Retina display and greatly reduce eye strain.

Download and install ProggyFont TrueType Font.

" add to ~/.vim/gvimrc

	// Build: mxmlc MyApp.as
	// Generates: MyApp.swf
	// You can debug with browser debug player plugin,
	// or using the debug player projector standalone app.
	package {
	import flash.display.Sprite;
	import flash.events.Event;

	public class MyApp extends Sprite {
	public function MyApp() {

	# Add the following to ~/.gitconfig
	# [include]
	# path=joey.gitconfig

	[alias]
	st = status
	br = branch

	# Show graphical history in terminal.
	gr = log --graph --oneline --abbrev-commit --decorate --color

	#!/bin/bash
	if [[ -z $3 ]]; then
	echo "Usage: $(basename $BASH_SOURCE) bad-email good-email good-name"
	exit 1
	fi
	export BAD_EMAIL=$1
	export GOOD_EMAIL=$2
	export GOOD_NAME=$3
	git filter-branch --env-filter '
	if [[ $GIT_AUTHOR_EMAIL = $BAD_EMAIL ]]; then

	find $1 -type f -executable -not -name '*.js' -exec file {} \;

	# non-gnu
	# find $1 -type f -perm /111 -not -name '*.js' -exec file {} \;