Add initial MigrateCommand

Not all migrators can actually be calld from the comand line. Some require
options which are not passed in and have to be called by other means.

bin/jekyll2

@@ -43,6 +43,7 @@ command :serve do |c|
   c.option '-p', '--port [PORT]', 'Port to listen on'
   c.option '-h', '--host [HOST]', 'Host to bind to'
   c.option '-b', '--baseurl [URL]', 'Base URL'
+
   c.action do |args, options|
     options.default :port => '4000',
                     :host => '0.0.0.0',
@@ -54,3 +55,18 @@ command :serve do |c|
     Jekyll::ServeCommand.process(options)
   end
 end
+
+command :migrate do |c|
+  c.syntax = 'jekyll migrate <platform> [options]'
+  c.description = 'Migrate your own blog to Jekyll'
+
+  c.option '--file', 'File to migrate from'
+  c.option '--dbname', 'Database name to migrate from'
+  c.option '--user', 'Username to use when migrating'
+  c.option '--pass', 'Password to use when migrating'
+  c.option '--host', 'Host address to use when migrating'
+
+  c.action do |args, options|
+    Jekyll::MigrateCommand.process(args.first, options)
+  end
+end

lib/jekyll/commands/migrate.rb

@@ -0,0 +1,47 @@
+module Jekyll
+
+  class MigrateCommand < Command
+    MIGRATORS = {
+      :csv => 'CSV',
+      :drupal => 'Drupal',
+      :enki => 'Enki',
+      :mephisto => 'Mephisto',
+      :mt => 'MT',
+      :posterous => 'Posterous',
+      :textpattern => 'TextPattern',
+      :tumblr => 'Tumblr',
+      :typo => 'Typo',
+      :wordpressdotcom => 'WordpressDotCom',
+      :wordpress => 'WordPress'
+    }
+
+    def self.process(migrator, options)
+      abort 'missing argument. Please specify a migrator' if migrator.nil?
+      migrator = migrator.downcase
+
+      cmd_options = []
+      [ :file, :dbname, :user, :pass, :host, :site ].each do |p|
+        cmd_options << "\"#{options[p]}\"" unless options[p].nil?
+      end
+
+
+      if MIGRATORS.keys.include?(migrator)
+        app_root = File.expand_path(
+          File.join(File.dirname(__FILE__), '..', '..', '..')
+        )
+
+        require "#{app_root}/lib/jekyll/migrators/#{migrator}"
+
+        if Jekyll.const_defiend?(MIGRATORS[migrator.to_sym])
+          puts 'Importing...'
+          migrator_class = Jekyll.const_get(MIGRATORS[migrator.to_sym])
+          migrator_class.process(*cmd_options)
+          exit 0
+        end
+      end
+
+      abort 'invalid migrator. Please specify a valid migrator'
+    end
+  end
+
+end