nanoc in nanoc-3.0.0a1

- old
+ new
@@ -1,15 +1,33 @@
 #!/usr/bin/env ruby
+# encoding: utf-8
 
-# Add lib to load path
-$LOAD_PATH.unshift(File.expand_path(File.dirname(__FILE__) + '/../lib'))
+# Find version
+version_file_path = File.expand_path('~/.nanoc-select-version')
+if !File.exist?(version_file_path)
+  warn 'WARNING: No nanoc version has been selected; using nanoc 3.x by default. Select a version using `nanoc-select` to make this warning go away.'
+  version = 3
+else
+  version = File.read(version_file_path).to_i
+end
 
-# Load nanoc
-require 'nanoc'
-require 'nanoc/cli'
+# Determine nanoc executable name
+VERSION_MAP = {
+  2 => 'nanoc2',
+  3 => 'nanoc3'
+}
+name = VERSION_MAP[version]
+if name.nil?
+  $stderr.puts "Unsupported nanoc version number: #{version}. Supported versions: #{VERSION_MAP.keys.join(', ')}."
+  exit 1
+end
 
-# Load custom code that can't be load later
-Dir['lib/commands/*.rb'].each     { |f| require f }
-Dir['lib/data_sources/*.rb'].each { |f| require f }
-
-# Run base
-Nanoc::CLI::Base.new.run(ARGV)
+# Run nanoc
+begin
+  exec name, *ARGV
+rescue Errno::ENOENT
+  $stderr.puts "Could not execute #{name}, which is your selected nanoc version. Make sure that #{name} is installed and that it is in your $PATH."
+  $stderr.puts
+  $stderr.puts "* To install #{name}, run `gem install #{name}`."
+  $stderr.puts "* To select a different version of nanoc, run `nanoc-select`."
+  exit 1
+end