Costis Panagiotopoulos costis

Setting up and installing rbenv, ruby-build, rubies, rbenv-gemset, and bundler

This guide enables you to install (ruby-build) and use (rbenv) multiple versions of ruby, isolate project gems (gemsets and/or bundler), and automatically use appropriate combinations of rubies and gems.

TL;DR Demo

# Ensure system is in ship-shape.

aptitude install git zsh libssl-dev zlib1g-dev libreadline-dev libyaml-dev

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 cheat sheet

(C-x means ctrl+x, M-x means alt+x)

Prefix key

The default prefix is C-b. If you (or your muscle memory) prefer C-a, you need to add this to ~/.tmux.conf:

remap prefix to Control + a

Some scripts/configurations that greatly improve tmux/vim workflows. The shell scripts target zsh but should be adaptable without much effort for other unix shells.

Features:

Transparently move between tmux panes and vim windows
Using the shell, open files in one vim instance per project or directory
Fully integrated copy/paste between tmux, vim and x11 using simple keybinds(need to install the xclip program)
Easily send text to any tmux pane without breaking your edit workflow(needs slimux

'vim-tmux-move.zsh', '.vimrc' and '.tmux.conf' cooperate so you can move transparently between tmux panes and vim windows using ALT + (arrow keys or jkhl). It was based on this gist

How to setup your own CA with OpenSSL

For educational reasons I've decided to create my own CA. Here is what I learned.

First things first

Lets get some context first.

	# Simple bijective function
	# Basically encodes any integer into a base(n) string,
	# where n is ALPHABET.length.
	# Based on pseudocode from http://stackoverflow.com/questions/742013/how-to-code-a-url-shortener/742047#742047

	ALPHABET =
	"abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789".split(//)
	# make your own alphabet using:
	# (('a'..'z').to_a + ('A'..'Z').to_a + (0..9).to_a).shuffle.join

	<% [:notice, :error, :alert].each do \|level\| %>
	<% unless flash[level].blank? %>
	<div class="alert-message <%= flash_class(level) %>">
	<a class="close" href="#">×</a>
	<%= content_tag :p, flash[level] %>
	</div>
	<% end %>
	<% end %>

	require 'formula'

	class Vim < Formula
	homepage 'http://www.vim.org/'
	version '7.3.666'

	url 'https://vim.googlecode.com/hg/', :revision => '1e22adc6176e'
	head 'https://vim.googlecode.com/hg/'

	def install

	# For context, this was inspired by the RubyRogues podcast #79 where they talked about
	# documentation in Ruby, and specifically grumbled quite a bit about the failings of RDoc.
	#
	# http://rubyrogues.com/079-rr-documenting-code/
	#
	# As someone who's spent a lot of time using an IDE for programming C# and Java, I think
	# Ruby could do a lot better at putting documentation at our fingertips as we program.
	#
	# Maybe making the documentation part of the structure of the code would facilitate this?
	#

	# MODEL

	class Case < ActiveRecord::Base
	include Eventable

	has_many :tasks

	concerning :Assignment do
	def assign_to(new_owner:, details:)
	transaction do