Platform framework and detect DSL

lib/train.rb

@@ -6,6 +6,7 @@
 require 'train/options'
 require 'train/plugins'
 require 'train/errors'
+require 'train/platforms'
 require 'uri'
 
 module Train
@@ -16,6 +17,9 @@ module Train
   # @param [Array] *args list of arguments for the plugin
   # @return [Transport] instance of the new transport or nil
   def self.create(name, *args)
+    # require built in detect platforms at this level so any manual ones will be at the top
+    require 'train/platforms/detect'
+
     cls = load_transport(name)
     cls.new(*args) unless cls.nil?
   end

lib/train/errors.rb

@@ -20,4 +20,7 @@ class ClientError < ::StandardError; end
   # Base exception class for all exceptions that are caused by other failures
   # in the transport layer.
   class TransportError < ::StandardError; end
+
+  # Exception for when no platform can be detected
+  class PlatformDetectionFailed < ::StandardError; end
 end

lib/train/extras.rb

@@ -4,7 +4,6 @@
 
 module Train::Extras
   require 'train/extras/command_wrapper'
-  require 'train/extras/os_common'
   require 'train/extras/stat'
 
   CommandResult = Struct.new(:stdout, :stderr, :exit_status)