Dev: enhance thor tasks

Rakefile

@@ -16,7 +16,7 @@ rescue
     sh "bundle install"
     Bundler.setup
   else
-    raise "You need to install a bundle first. Try 'thor rails:use 3.0.7'"
+    raise "You need to install a bundle first. Try 'thor gemfile:use 3.0.7'"
   end
 end
 Bundler::GemHelper.install_tasks

Thorfile

@@ -1,4 +1,4 @@
-class Rails < Thor
+class Gemfile < Thor
   desc "use VERSION", "installs the bundle using gemfiles/rails-VERSION"
   def use(version)
     gemfile = "--gemfile gemfiles/rails-#{version}"
@@ -7,4 +7,23 @@ class Rails < Thor
     say `ln -s gemfiles/bin` unless File.exist?('bin')
     `echo rails-#{version} > ./.gemfile`
   end
+
+  desc "which", "print out the configured gemfile"
+  def which
+    say `cat ./.gemfile`
+  end
+
+  desc "list", "list the available options for 'thor gemfile:use'"
+  def list
+    all = `ls gemfiles`.chomp.split.grep(/^rails/).reject {|i| i =~ /lock$/}
+
+    versions = all.grep(/^rails-\d\.\d/)
+    branches = all - versions
+
+    puts "releases:"
+    versions.sort.reverse.each {|i| puts i}
+    puts
+    puts "branches:"
+    branches.sort.reverse.each {|i| puts i}
+  end
 end