markjlorenz

function minutes_since_last_commit {
    Color_Off="\033[0m"
    Red="\033[0;31m"
    Green="\033[0;32m"
    Yellow="\033[0;33m"

    git branch &>/dev/null
    if [ $? -eq 0 ]; then
      now=`date +%s`
      last_commit=`git log --pretty=format:'%at' -1`

markjlorenz

" Run app.js and put the output in a new buffer below the current one
:bel new | r !node app.js

" And map it to ",r"
:map ,r :bel new \| r !node app.js <cr>

" And stop warning me about unsaved data
:map ,r :bel new \| setlocal buftype=nofile \| r !node app.js <cr>

markjlorenz

Reverse Port Tunneling with EC2

Reverse port tunneling is used to give a user outside of a networks firewall accesst to a computer inside the firewall where direct SSH connections aren't allowed. It works by the in-firewall computer SSH'ing to a middleman computer that then forwards incomming SSH connections on a given port to the firewalled computer.

Setup the middleman

• Get an ubuntu EC2 instance
• Download it's security keys (both in-firewall and out-firewall computers will need the private key)
• Setup the security group to allow connections on port 10002
• SSH into the middleman and add: GatewayPorts yes to /etc/ssh/sshd_config

markjlorenz

# Use the mac's built in webcame to snap a pic, and circle the faces.
# requires (imagesnap)[https://github.com/rharder/imagesnap] be in `/vendor/imagesnap`
# and that you have openCV installed: 
#  `brew update`
#  `brew tap homebrew/science`
#  `brew install opencv`

# Ye 'olde requires.
cv        = require('opencv')
spawn     = require('child_process').spawn

markjlorenz

#!/usr/bin/env ruby
#/ Usage: <progname> [options]...
#/ How does this script make my life easier?
# ** Tip: use #/ lines to define the --help usage message.
$stderr.sync = true
require 'optparse'

# default options
flag    = false
option  = "default value"

markjlorenz

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.

Instructions

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

markjlorenz

colorscheme vividchalk
set nocompatible
set nobackup
set tabstop=2
set softtabstop=2
set shiftwidth=2
set expandtab
set indentexpr=
set number
set autoindent

markjlorenz

bind c stuff "screen -X chdir \$PWD; screen^M"
defscrollback 90000 # Use a 30000-line scrollback buffer
escape ^@a  # Instead of Control-a, make the escape/command character be Control-space
term screen-256color

markjlorenz

CMRotationMatrix rotationMatrixFromGravity(float x, float y, float z)
{	
	// The Z axis of our rotated frame is opposite gravity
	vec3f_t zAxis = vec3f_normalize(vec3f_init(-x, -y, -z));
	
	// The Y axis of our rotated frame is an arbitrary vector perpendicular to gravity
	// Note that this convention will have problems as zAxis.x approaches +/-1 since the magnitude of
	// [0, zAxis.z, -zAxis.y] will approach 0
	vec3f_t yAxis = vec3f_normalize(vec3f_init(0, zAxis.z, -zAxis.y));
	

markjlorenz

#!/usr/bin/env gnuplot

set datafile separator ","

file="`echo $plot_file`"    # make sure to set the $plot_file environment varible first

f(x) = m * x**b             # fit to trend matching mx^b
m = 5                       # start the 'm' search at 5
b = 2                       # start the 'b' search at 2
fit f(x) file  via m,b