ruohan.chen crhan

tmux cheatsheet

As configured in my dotfiles.

start new:

tmux

start new with session name:

One-line Tree in Python

Using Python's built-in defaultdict we can easily define a tree data structure:

def tree(): return defaultdict(tree)

That's it!

A Capistrano Rails Guide

by Jonathan Rochkind, http://bibwild.wordpress.com

why cap?

Capistrano automates pushing out a new version of your application to a deployment location.

I've been writing and deploying Rails apps for a while, but I avoided using Capistrano until recently. I've got a pretty simple one-host deployment, and even though everyone said Capistrano was great, every time I tried to get started I just got snowed under not being able to figure out exactly what I wanted to do, and figured I wasn't having that much trouble doing it "manually".

Dear Rubyists,

I just lost a contract because of my code in a Rails project.

The specific code in question is related to a "posting a comment" feature. Here are the details:

In this project, "posting a comment" does not simply entail inserting a row into the database. It involves a procedure to yes, insert a row, but also detect its language, check for spam, send emails, and "share" it to Twitter and Facebook. I believe this algorithm should be encapsulated. I do not believe it belongs in a controller or a model. I do not believe Active Record callbacks should be used.

The "senior developer", whom is the stake holder's right hand man, said this:

tmux shortcuts & cheatsheet

start new:

tmux

start new with session name:

tmux new -s myname

Unfortunately, the Cisco AnyConnect client for Mac conflicts with Pow. And by "conflicts", I mean it causes a grey-screen-of-death kernel panic anytime you connect to the VPN and Pow is installed.

As an alternative, there is OpenConnect, a command-line client for Cisco's AnyConnect SSL VPN.

Here's how to get it set up on Mac OS X:

OpenConnect can be installed via homebrew:
```
 brew update
```

brew install openconnect

	#!/bin/bash

	##############################
	# dnspodsh v0.3
	# 基于dnspod api构架的bash ddns客户端
	# 作者：zrong(zengrong.net)
	# 详细介绍：http://zengrong.net/post/1524.htm
	# 创建日期：2012-02-13
	# 更新日期：2012-03-11
	##############################

	load 'rake/helper.rb'

	desc "Set up the VM"
	task :up do
	vm = VM.new
	vm.cli('up')
	end

	desc "Shutdown the VM"
	task :graceful_down do

	require 'msgpack'
	require 'thread'

	class ProcessPool
	def initialize(num_process, args={})
	queue_size, worker_class = parse_args([
	:queue_size, nil,
	:worker_class, Worker,
	], args)

	#!/usr/bin/ruby

	require 'socket'

	# From bits/ioctls.h
	SIOCGIFNETMASK = 0x891b # Netmask address
	SIOCGIFHWADDR = 0x8927 # hardware address
	SIOCGIFADDR = 0x8915 # PA address
	SIOCGIFCONF = 0x8912 # iface list