generate_rails_app.rb

#!/usr/bin/env ruby

# Written by Kieran P
# http://github.com/KieranP
# http://twitter.com/k776
# http://k776.tumblr.com
#
# Feel free to fork and modify.
# If you do, send me a message on
# Github details changes and I'll
# pull them back if they work and
# don't conflict

if ARGV.empty?
  puts "
Usage:

  ruby generate_rails_app.rb APP_PATH [options]

Options:

  [--environment=env]    # The environment you want data to be populated into,
                         # or the server to start into.

  [--rails-clone=path]   # Path to existing Rails Git clone.
                         # If not present, will create clone at that location.
                         # If not provided, will clone to 'rails' in current directory

  [--start-server]       # Start the server once every other operation is complete

  [--with-data]          # Populate new Rails app with Blog style scaffolding


Example:
  ruby generate_rails_app.rb ~/Code/Ruby/weblog

"
  exit
end

APP_NAME = ARGV.first
WITH_DATA = ARGV.any? { |arg| arg == '--with-data' }
RAILS_CLONE = File.expand_path((ARGV.detect { |arg| arg =~ /--rails-clone=(.*)/ } && $1) || 'rails')
START_SERVER = ARGV.any? { |arg| arg == '--start-server' }

ENVIRONMENT = (ARGV.detect { |arg| arg =~ /--environment=(.*)/ } && $1) || 'development'
ENV['RAILS_ENV'] = ENVIRONMENT

require 'fileutils'
def exe(cmd); puts cmd; system(cmd); end
def sep; " ----------------------------- "; end
def heading(text); puts "\n" + sep + text + sep + "\n\n"; end

heading("Checking for required software")
raise "ERROR: Git does not appear to be installed with your $PATH. See http://git-scm.com/download" unless system('which -s git')
raise "ERROR: Gem bundler does not appear to be installed or isn't the latest version. Run '[sudo] gem install bundler'" unless `gem bundle` =~ /Gemfile to use/
puts "Git and Gem Bundler found. Continuing.."

heading("Preparing Rails clone")
exe("git clone git://github.com/rails/rails.git #{RAILS_CLONE}") unless File.directory?(RAILS_CLONE)
FileUtils.cd(RAILS_CLONE, :verbose => true) do
  exe("git checkout master")
  exe("git pull origin master")
end

heading("Creating new application")
exe("rm -rf #{APP_NAME}") if File.directory?(APP_NAME)
exe("ruby #{File.join(RAILS_CLONE, 'railties/bin/rails')} #{APP_NAME}")

FileUtils.cd(APP_NAME, :verbose => true) do
  heading("Bundling required gems")
  File.open('Gemfile', 'a') do |f|
    f.puts "directory '#{RAILS_CLONE}', :glob => '{*/,}*.gemspec'"
    f.puts "git 'git://github.com/rails/rack.git'"
    f.puts "git 'git://github.com/rails/arel.git'"
  end
  exe("gem bundle")

  if WITH_DATA
    heading("Adding initial test data")
    exe("ruby script/generate scaffold Post title:string body:text published:boolean")
    exe("ruby script/generate scaffold Comment post_id:integer title:string body:text author_name:string author_email:string author_website:string")
    exe("bin/rake db:migrate")

    heading("Removing public/index.html and changing routes")
    exe("rm public/index.html")
    routes = File.read('config/routes.rb')
    routes.gsub!( '# root :to => "welcome#index"', 'root :to => "posts#index"' )
    File.open('config/routes.rb', "w") { |f| f.puts routes }
  end

  if START_SERVER
    heading("Starting up application server")
    exe("ruby script/server --environment=#{ENVIRONMENT}")
  end
end