setup.rb

#!/usr/bin/env ruby
# vim:set ft=ruby:

require "optparse"
require "tmpdir"

OPTS = {}

OptionParser.new.instance_eval do
	on('-d', '--dry') { OPTS[:dry] = true }

	on('-v', '--verbose') { OPTS[:verbose] = true }

	on('--homebrew [DST]', 'install Homebrew in DST (default is /usr/local)') do |dst|
		OPTS[:homebrew] = dst || '/usr/local'
	end

	on('--perlbrew [DST]', 'install perlbrew in DST (default is ~/perl5/perlbrew)') do |dst|
		OPTS[:perlbrew] = dst || '~/perl5/perlbrew'
	end

	on('--rvm', 'install RVM') { OPTS[:rvm] = true }
end.parse!(ARGV)

module Helper
	def info(msg)
		STDERR.puts "\e[32mINFO:\e[0m#{msg}" if OPTS[:verbose] || OPTS[:dry]
	end

	def warn(msg)
		STDERR.puts "\e[33mWARN:\e[0m#{msg}"
	end

	def die(msg)
		STDERR.puts "\e[31mERROR:\e[0m \e[4m#{caller.first}\e[0m => #{msg}"
		exit 1
	end

	def installed?(cmd)
		File.executable? `which #{cmd}`.strip
	end

	def sh(*args)
		info args.join(' ')
		system args.join(' ') unless OPTS[:dry]
	end

	def install_homebrew(dst='/usr/local')
		prefix = File.realpath(File.expand_path(dst))
		srcdir = File.join(Dir.tmpdir, "homebrew-#{$$}")
		warn "Homebrew is installed in #{prefix}"
		sh %Q!curl -LsSf https://github.com/mxcl/homebrew/tarball/master | tar xz --strip 1 -C#{prefix}! 
		sh %Q!#{prefix}/bin/brew install git!
		sh 'mkdir', srcdir
		sh %Q!#{prefix}/bin/git clone git://github.com/mxcl/homebrew.git #{srcdir}!
		sh 'cp', '-r', srcdir, prefix
		sh 'rm', '-r', srcdir
	end

	def install_perlbrew(dst='~/perl5/perlbrew')
		perlbrew_dir = File.realpath(File.expand_path(dst))
		workdir = File.join(Dir.tmpdir, "perlbrew-#{$$}")
		installer = File.join(workdir, '_perlbrew')
		sh 'mkdir', workdir
		sh %Q!curl -LsSo #{installer} http://xrl.us/perlbrew!
		sh 'chmod', 'u+x', installer
		sh %Q!PERLBREW_ROOT=#{perlbrew_dir} #{installer} install #{'-v' if OPTS[:verbose]}!
		sh %Q!#{perlbrew_dir}/bin/perlbrew init!
		sh %Q!source #{perlbrew_dir}/etc/#{current_shell_type}rc!
	end

	def install_rvm
		workdir = File.join(Dir.tmpdir, "rvm-#{$$}")
		installer = File.join(workdir, 'rvm-installer')
		sh 'mkdir', workdir
		sh %Q!curl -LsSo #{installer} https://rvm.beginrescueend.com/install/rvm!
		sh 'chmod', '+x', installer
		sh installer, '--version', 'latest'
		sh %Q![[ -s "#{ENV['HOME']}/.rvm/scripts/rvm" ]] && source "#{ENV['HOME']}/.rvm/scripts/rvm"!
	end

	def current_shell_type
		case File.basename(ENV['SHELL'])
		when /^(?:a|k|z|(?:s|b)?a)?sh/
			:bash
		when /^t?csh/
			:csh
		else
			die "Unknown shell: #{ENV['SHELL']}"
		end
	end
end

include Helper

tasks = []
tasks << Thread.new { install_homebrew OPTS[:homebrew] } if OPTS[:homebrew]
tasks << Thread.new { install_perlbrew OPTS[:perlbrew] } if OPTS[:perlbrew]
tasks << Thread.new { install_rvm }                      if OPTS[:rvm]
tasks.each {|t| t.join }

warn "#{$0} extracts files in here!"

if installed? 'git'
	sh %Q{git clone git@github.com:aereal/dotfiles .}
else
	sh %Q{curl -fLsS https://github.com/aereal/dotfiles/tarball/master | tar xzf - -C. --strip 1}
end

sh %Q{rake install}

mkdir ~/dotfiles && cd ~/dotfiles
curl -sSfL https://gist.github.com/raw/954410/648dd2fb79e0632e757b4d2af66823bec74868dd/setup.rb | ruby -