Tomas Tamadamas tamadamas

Pushing to Multiple Git Repos

If a project has to have multiple git repos (e.g. Bitbucket and Github) then it's better that they remain in sync.

Usually this would involve pushing each branch to each repo in turn, but actually Git allows pushing to multiple repos in one go.

If in doubt about what git is doing when you run these commands, just

This is unmaintained, please visit Ben-PH/spacemacs-cheatsheet

Useful Spacemacs commands

SPC q q - quit
SPC w / - split window vertically
SPC w - - split window horizontally
SPC 1 - switch to window 1
SPC 2 - switch to window 2
SPC w c - delete current window

emacs --daemon to run in the background. emacsclient.emacs24 <filename/dirname> to open in terminal

NOTE: "M-m and SPC can be used interchangeably".

Undo - C-/
Redo - C-?
Change case: 1. Camel Case : M-c 2. Upper Case : M-u

Lower Case : M-l

Vivaldi "Standalone Mode" on Mac

The following commands will produce a small application that allows you to run Vivaldi—or any other Chromium-based browser—in Standalone mode on a Mac. This could be used for testing a specific setup or version, without touching the system wide settings (profile). It can also be used to create a portable (USB install) of Vivaldi that you could store on an external disk, for sharing between computers.

Manual method

Start Terminal and issue the following:

mkdir -p Standalone\ Mode.app/Contents/MacOS

When should you use DateTime and when should you use Time?

It's a common misconception that [William Shakespeare][1] and [Miguel de Cervantes][2] died on the same day in history - so much so that UNESCO named April 23 as [World Book Day because of this fact][3]. However because England hadn't yet adopted [Gregorian Calendar Reform][4] (and wouldn't until [1752][5]) their deaths are actually 10 days apart. Since Ruby's Time class implements a [proleptic Gregorian calendar][6] and has no concept of calendar reform then there's no way to express this. This is where DateTime steps in:

>> shakespeare = DateTime.iso8601('1616-04-23', Date::ENGLAND)
=> Tue, 23 Apr 1616 00:00:00 +0000
>> cervantes = DateTime.iso8601('1616-04-23', Date::ITALY)
=> Sat, 23 Apr 1616 00:00:00 +0000

ffmpeg

Converting Audio into Different Formats / Sample Rates

Minimal example: transcode from MP3 to WMA:
ffmpeg -i input.mp3 output.wma

You can get the list of supported formats with:
ffmpeg -formats

You can get the list of installed codecs with:

	require 'benchmark'
	require 'benchmark/ips'

	seed = 1239012

	Benchmark.ips do \|x\|
	x.report('bitwise multiplication by 2') { seed << 1 }
	x.report('arithmetic multiplication by 2') { seed * 2 }

	x.report('bitwise division by 2') { seed >> 1 }

	" _____ __ __ _____ __________ _ ___ __ _
	" / ____\| \/ \|_ _\|___ / __ \\| \ \| \ \ / / (_)
	" \| \| \| \ / \| \| \| / / \| \| \| \\| \|\ \_/ / ______ __ ___ _ __ ___ _ __ ___
	" \| \| \| \|\/\| \| \| \| / /\| \| \| \| . ` \| \ / \|______\| \ \ / / \| '_ ` _ \\| '__/ __\|
	" \| \|____\| \| \| \|_\| \|_ / /_\| \|__\| \| \|\ \| \| \| \ V /\| \| \| \| \| \| \| \| \| (__
	" \_____\|_\| \|_\|_____/_____\____/\|_\| \_\| \|_\| \_/ \|_\|_\| \|_\| \|_\|_\| \___\|
	"
	"
	" 1. Easy navigation in .vimrc:
	" Use <Leader>ig to view indentation guides

	# Mina Deploy
	# ===========
	#
	# Adapted from Creative deploy stack in Manabalss v4, Mar.2015, updated to support staging on Jun.2015
	# On first deploy do: mina setup --verbose
	# Then do : mina deploy[initialize] --trace
	#
	# Usage examples:
	# mina deploy[soft,seed,compile] to=staging # deploy task with all options \| a simple `mina deploy` will deploy to production
	# mina rake[db:seed] # for multi-argument tasks # mina 'rake[payments:refund[arg1\,arg2]]'