generate .rvmrc

rvmrc.rb

#!/usr/bin/env ruby

require 'rubygems'
require 'micro-optparse'

options = Parser.new { |p|
  p.banner = "Generate .rvmrc file."
  p.version = "0.1"
  p.option :ruby,   "Version of Ruby interpreter installed with RVM", :default => RUBY_VERSION
  p.option :gemset, "Name of RVM gemset", :default => File.basename(`pwd`.strip)
  p.option :force,  "Write file whether it exists or not", :default => false
}.process!

file = ".rvmrc"
if File.exist? file and !options[:force]
  abort "#{file} already exists!"
else
  line = "rvm use #{options[:ruby]}@#{options[:gemset]}"
  File.open(file, "w") { |f| f.write(line) }
  puts %(Write "#{line}" to #{file}.)
end