Have you ever wanted to send a secret message?

The Plan

Today we use computers to mask messages every day. When you connect to a website that uses "https" in the address, it is running a special encoding on your transmissions that makes it very difficult for anyone to listen in between you and the server.

View gist:4a0a3ad089ce08f3476d025bea7361b4
# each_with_index, each_with_object and inject({}) are all %50 slower then #each
# simple each with an addition noop
[4] pry(main)> puts Benchmark.measure { (1..10_000_000).each { |i| i + 1 } }
0.450000 0.000000 0.450000 ( 0.448808)
# each_with_index
[5] pry(main)> puts Benchmark.measure { (1..10_000_000).each_with_index { |i, index| i + 1 } }
0.650000 0.000000 0.650000 ( 0.645812)
View benchmark_dead_horse.rb
require 'benchmark'
N = 1000000
nums ={ rand(N) }
enum = [1, 2, 'string', {}, [], false, true, nil]
def process(v)
View gist:da94e895d50c6bf2d41c
@import "compass/css3/images";
// CSS-only multi-line ellipsis with generated content
// yields `position:relative`, so remember to declare an eventual `position:absolute/fixed` *after* including this mixin
@mixin limitLines(
$maxLinesPortrait, // Mandatory: The number of lines after which the clipping should take action.
$maxLinesLandscape: $maxLinesPortrait, // You may provide a different line limit for landscape orientation.
// Note that 'portrait' is our default orientation. However, if you omit $maxLinesLandscape,
// the value of $maxLinesPortrait is used for whatever orientation (that is, without a media query).
View gist:10936593
# Example of how to test a module included into multiple models
require File.expand_path(File.join(File.dirname(__FILE__), "..", "spec_helper"))
describe Featurable do
class FeaturableObject
include Featurable
attr_accessor :sport, :featured_at
View dnsbackup.rb
#!/usr/bin/env ruby
require 'rubygems'
require 'nokogiri'
dir = File.join( ENV['DNS_BACKUP_DIR'] || '.', 'zerigo' )
raise "set ZERIGO_USER" unless user
raise "set ZERIGO_KEY" unless key
raise "set DNS_BACKUP_DIR" unless key
View git-extract-file.markdown

How to extract a single file with its history from a git repository

These steps show two less common interactions with git to extract a single file which is inside a subfolder from a git repository. These steps essentially reduce the repository to just the desired files and should performed on a copy of the original repository (1.).

First the repository is reduced to just the subfolder containing the files in question using git filter-branch --subdirectory-filter (2.) which is a useful step by itself if just a subfolder needs to be extracted. This step moves the desired files to the top level of the repository.

Finally all remaining files are listed using git ls, the files to keep are removed from that using grep -v and the resulting list is passed to git rm which is invoked by git filter-branch --index-filter (3.). A bit convoluted but it does the trick.

1. copy the repository to extract the file from and go to the desired branch

View nginx + node

The idea is to have nginx installed and node installed. I will extend this gist to include how to install those as well, but at the moment, the following assumes you have nginx 0.7.62 and node 0.2.3 installed on a Linux distro (I used Ubuntu).

In a nutshell,

1) nginx is used to serve static files (css, js, images, etc.) 2) node serves all the "dynamic" stuff.

So for example, request comes and your css, js, and images get served thru nginx while everything else (the request for say index.html or "/") gets served through node.

3) nginx listens on port 80.


Each of these commands will run an ad hoc http static server in your current (or specified) directory, available at http://localhost:8000. Use this power wisely.

Discussion on reddit.

Python 2.x

$ python -m SimpleHTTPServer 8000
View nginx.conf
# to generate your dhparam.pem file, run in the terminal
openssl dhparam -out /etc/nginx/ssl/dhparam.pem 2048