weakish weakish

Gist Clients

Want to create a Gist from your editor, the command line, or the Services menu? Here's how.

Editor Support

Moved to https://weakish.github.io/StutteringTalkaholic/dive-into/fish/

Moved to https://weakish.github.io/StutteringTalkaholic/dive-into/centos/

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!

從 SocialCalc 到 EtherCalc

先前在《開源應用程式架構》一書中，我介紹了 SocialCalc 這個在瀏覽器中運行的試算表編輯器，以取代伺服器為中心的 WikiCalc 架構。SocialCalc 在瀏覽器中執行所有的運算，只有在載入和儲存試算表時才會使用伺服器。

追求效能是 Socialtext 團隊在 2006 年時設計 SocialCalc 的主要目的。重點在於：在 JavaScript 環境下執行客戶端運算，儘管在當年的速度僅有伺服器端 Perl 運算的十分之一，但仍然勝過 AJAX 來回傳輸資料造成的網路延遲：

******

To test out the cache miss behavior of read operations, run a program building the index (30k entries) then another program building then reading the index (30k queries), and find their diff.

Here's how to generate the test script cmd.sh

3.times do |i|
  %w[triez hash da].each do |ty|
    puts "valgrind --tool=cachegrind --cachegrind-out-file=tmp/#{ty} ruby t.rb #{ty}"
    puts "valgrind --tool=cachegrind --cachegrind-out-file=tmp/#{ty}.read ruby t.rb #{ty} read"
    puts "cg_diff tmp/#{ty} tmp/#{ty}.read > tmp/#{ty}#{i}.diff"

Security is Hard

Massive Assignment

watch for ActiveRecord Relation, like has_many, has_many :through
watch for user_roles, `group_users
UPDATE action

Admin

Intro

TCL-Expect scripts are an amazingly easy way to script out laborious tasks in the shell when you need to be interactive with the console. Think of them as a "macro" or way to programmaticly step through a process you would run by hand. They are similar to shell scripts but utilize the .tcl extension and a different #! call.

Setup Your Script

The first step, similar to writing a bash script, is to tell the script what it's executing under. For expect we use the following:

#!/usr/bin/expect

	#!/bin/bash
	## vim:ts=4:sw=4:tw=100:ai:nowrap:formatoptions=croqln:
	#*******************************************************#
	# tumblr.sh #
	# written by Rahul Kumar #
	# 2010/01/01 #
	# Post, edit, delete, read tumblr.com #
	#*******************************************************#
	# References: http://www.tumblr.com/api#api_write
	# DONE : add read

	If you don't have meteor, install it:
	curl https://install.meteor.com \| /bin/sh

	Then, just copy paste this into your terminal:

	meteor create my-app
	cd my-app/
	meteor add coffeescript
	meteor add stylus
	js2coffee my-app.js > my-app.coffee