#!/usr/bin/env ruby

# Detects the database adapter used in a Rails application from a Gemfile.
# If more than one adapter is found, an exception will be raised, since the 
# ultimate purpose of this script is to help generate a database.yml. Our 
# assumption is that something weird is going on if there is more than one 
# adapter gem listed in the Gemfile, so we throw up our hands.

# *Note that this evaluates the Gemfile as a ruby script, so it's possible
# for someone to do something nasty in this file*

require "#{File.dirname(__FILE__)}/../lib/railblazer"

if ARGV.empty?
  puts "Usage is app_adapter GEMFILE_PATH"
  exit 1
end

gemfile = Railblazer::MinimalGemfile.new(File.new(ARGV[0]))
print Railblazer::AdapterDetection.new(gemfile).run