Add command help

modules/Credits.rb

@@ -10,7 +10,13 @@ module Lain
         return unless message.type == :groupchat
         return unless /!credits\b/ =~ message.body
 
-        muc.send(Jabber::Message.new(message.to, "Lain (レイン) #{Version}\n\n -- hacked by NeoRaider"))
+        muc.send(Jabber::Message.new(message.to, "\nLain (レイン) #{Version}\n\n -- hacked by NeoRaider"))
+      end
+
+      def commands
+        {
+          '!credits' => 'show credits'
+        }
       end
     end
   end

modules/DDate.rb

@@ -9,7 +9,13 @@ module Lain
         return unless message.type == :groupchat
         return unless /!ddate\b/ =~ message.body
 
-        muc.send(Jabber::Message.new(message.to, IO.popen("ddate").gets(sep=nil).chomp))
+        muc.send(Jabber::Message.new(message.to, IO.popen("ddate").read.chomp))
+      end
+
+      def commands
+        {
+          '!ddate' => 'show Discordian date'
+        }
       end
     end
   end

modules/Fortune.rb

@@ -9,7 +9,13 @@ module Lain
         return unless message.type == :groupchat
         return unless /!fortune\b/ =~ message.body
 
-        muc.send(Jabber::Message.new(message.to, IO.popen(@config['command']).gets(sep=nil).chomp))
+        muc.send(Jabber::Message.new(message.to, "\n" + IO.popen(@config['command']).read.chomp))
+      end
+
+      def commands
+        {
+          '!fortune' => 'fortune cookies'
+        }
       end
     end
   end

modules/Help.rb

@@ -0,0 +1,22 @@
+require 'xmpp4r/message'
+
+require_relative '../module_base'
+
+module Lain
+  module Modules
+    class Help < Base
+      def on_message(muc, message)
+        return unless message.type == :groupchat
+        return unless /!help\b/ =~ message.body
+
+        muc.send(Jabber::Message.new(message.to, "Commands:" + @lain.commands.reduce('') { |s, cmd| "#{s}\n#{cmd[0]}: #{cmd[1]}" }))
+      end
+
+      def commands
+        {
+          '!help' => 'show this help'
+        }
+      end
+    end
+  end
+end