ordu.rb in ordu-0.0.3

- old
+ new

@@ -25,10 +25,11 @@
     options ||= self.class.options
     commands ||= self.class.commands
     action ||= self.class.action
     options.each { |o| option!(*o) }
     commands.each { |c| command!(*c) }
+    on_tail(command_summary) if command_summary
     @action = action
   end
 
   # Parse options in order, and call commands for non-option arguments (if the
   # command exists). This is how programs are exected.
@@ -38,9 +39,18 @@
       if commands.key?(args.first)
         return commands[args.shift].parse!(args) 
       end
     end
     run(*args)
+  end
+
+  # A string which summarizes the commands - shown in the help
+  def command_summary
+    return if commands.empty?
+    w = commands.keys.map(&:length).max
+    lines = ["Available commands:"]
+    lines += commands.map { |k, v| "    %-#{w}s     %s" % [k, v.desc] }
+    lines.join("\n")
   end
 
   # Parses a new instance. Note that this must be the top-level, since you
   # can't supply a name. This is convenient for starting the parser from
   # scripts.