Updated dynamic commands example to add help category

Author: kmvanbrunt

examples/dynamic_commands.py

@@ -3,13 +3,32 @@
 """A simple example demonstrating how do_* commands can be created in a loop.
 """
 import functools
+
 import cmd2
-COMMAND_LIST = ['foo', 'bar', 'baz']
+from cmd2.constants import COMMAND_FUNC_PREFIX, HELP_FUNC_PREFIX
+
+COMMAND_LIST = ['foo', 'bar']
+CATEGORY = 'Dynamic Commands'
 
 
 class CommandsInLoop(cmd2.Cmd):
     """Example of dynamically adding do_* commands."""
     def __init__(self):
+        # Add dynamic commands before calling cmd2.Cmd's init since it validates command names
+        for command in COMMAND_LIST:
+            # Create command function and add help category to it
+            cmd_func = functools.partial(self.send_text, text=command)
+            cmd2.categorize(cmd_func, CATEGORY)
+
+            # Add command function to CLI object
+            cmd_func_name = COMMAND_FUNC_PREFIX + command
+            setattr(self, cmd_func_name, cmd_func)
+
+            # Add help function to CLI object
+            help_func = functools.partial(self.text_help, text=command)
+            help_func_name = HELP_FUNC_PREFIX + command
+            setattr(self, help_func_name, help_func)
+
         super().__init__(use_ipython=True)
 
     def send_text(self, args: cmd2.Statement, *, text: str):
@@ -21,11 +40,6 @@ def text_help(self, *, text: str):
         self.poutput("Simulate sending {!r} to a server and printing the response".format(text))
 
 
-for command in COMMAND_LIST:
-    setattr(CommandsInLoop, 'do_{}'.format(command), functools.partialmethod(CommandsInLoop.send_text, text=command))
-    setattr(CommandsInLoop, 'help_{}'.format(command), functools.partialmethod(CommandsInLoop.text_help, text=command))
-
-
 if __name__ == '__main__':
     app = CommandsInLoop()
     app.cmdloop()