ruby

• ruby is the Ruby Interpreter
• ruby hello.rb runs the Ruby source file hello.rb
• Options
  • -w - warnings
  • -v - version or verbose
  • --help
  • -c - check syntax

irb

• Interactive Ruby Browser
• aka "the ruby console"
• interprets Ruby one line at a time
  • REPL: Read Eval Print Loop

uncluttering irb's cluttered prompt

irb --simple-prompt

or

alias irb="irb --simple-prompt"

or

echo "IRB.conf[:PROMPT_MODE] = :SIMPLE" >> ~/.irbrc

ri and rdoc

• if you're running rvm, do this right now:

  rvm docs generate
  

• rdoc generates and displays documentation

  • per file or class or gem
  • documentation comes from inside source code
  • RDoc Syntax described at http://rdoc.rubyforge.org/RDoc/Markup.html

web docs

• ruby-doc.org
• gotapi.com/rubyrails
• api.rubyonrails.org
• gem server launches an rdoc browser locally
• railscasts.com
• destroyallsoftware.com

cheat

• a text-only command-line wiki

• gem install cheat for command-line tool or see http://cheat.errtheblog.com

  $ cheat agile
  Agile Manifesto_____________
   - Individuals and interactions over processes and tools 
   - Working software over comprehensive documentation  
   - Customer collaboration over contract negotiation 
   - Responding to change over following a plan 
  While there is value in the items on the right, we value the items on the left
  more.
  

rake

• one Rakefile contains many "tasks" which can be run a la rake test
• rake looks up the directory tree for a Rakefile
• rake --tasks shows all defined tasks in the current Rakefile
  • also rake -T

gem

• aka RubyGems
• gem = Ruby package = library or program or plugin
• gem install foo - downloads and installs the "foo" gem from rubygems.org
• gem, rvm and bundler live in uneasy harmony

gem plugins

• installed as gems, but extend the gem command

• for example, open_gem which opens the source code for a gem in your editor

  gem install open_gem
  gem open rake
  

bundler

• manages lots of different sets of gems and versions thereof
• bundler is a gem itself
  • gem install bundler loads it into the current gemset
• bundle install
• bundle update
• Gemfile lists all the gems for the current project (directory)
  • similar to Rakefile in scope

rvm

• Ruby Version Manager
• manages lots of different versions and distros of Ruby on a single computer
  • rvm list
  • rvm install 1.9.2
  • rvm use 1.9.2
• also manages gemsets
  • rvm gemset create teaching
  • rvm use 1.9.2@teaching
• overlaps with gem and Bundler
  • in sometimes odd ways

Bundler vs. RVM

• RVM manages multiple gemsets on a single machine
• Bundler manages the same gemset on multiple machines

RSpec

• testing framework
• describe, it, before, after, should

dotfiles

• Are you on Unix/OSX? Check out Alex's dotfiles repo

  http://github.com/alexch/dotfiles

git

Git is a Distributed Version Control System. It's very popular these days, especially among Ruby developers.

Git allows offline, asynchronous, decentralized development.

GitHub is a web service built on git that also adds issue tracking, automated pull requests and merging, etc.

git workflow

git cheatsheet

• git init -- create a repo locally
• git clone -- copy a repo from a server
• git status -- what has changed
• git log -- history
• git add -- stage files for commit (*local*)
• git commit -- commit staged files (*remote*)

See also nerdgirl's visual git cheatsheet at https://github.com/nerdgirl/git-cheatsheet-visual

Git Configuration

Git needs to know who you are, so try this:

git config --global --list

and if it doesn't have your name, do this:

git config --global user.name "Your Name"
git config --global user.email mail@example.com

Next Lesson 

Outline