Fixes #40358 Help output could be better.

For now.  Add a header and footer.  Later on when I have per-function docs
it can look those up and print them (or open a viewer in the GUI.)

joy/gui/world.py

@@ -27,6 +27,7 @@ import os, pickle, sys
 from inspect import getdoc
 
 from joy.joy import run
+from joy.library import HELP_TEMPLATE
 from joy.parser import Symbol
 from joy.utils.stack import stack_to_string
 from joy.utils.types import type_check
@@ -59,14 +60,15 @@ class World(object):
 
 	def do_opendoc(self, name):
 		if is_numerical(name):
-			print('The number', name)
+			doc = 'The number ' + str(name)
 		else:
 			try:
 				word = self.dictionary[name]
 			except KeyError:
-				print(repr(name), '???')
+				doc = 'Unknown: ' + repr(name)
 			else:
-				print(getdoc(word))
+				doc = getdoc(word)
+		print(HELP_TEMPLATE % (name, doc, name))
 		self.print_stack()
 
 	def pop(self):

joy/library.py

@@ -72,6 +72,16 @@ from .utils.types import (
 	)
 
 
+HELP_TEMPLATE = '''\
+
+==== Help on %s ====
+
+%s
+
+---- end (%s)
+'''
+
+
 _SYM_NUMS = lambda c=count(): next(c)
 _COMB_NUMS = lambda c=count(): next(c)
 
@@ -890,7 +900,7 @@ def help_(S, expression, dictionary):
 	'''Accepts a quoted symbol on the top of the stack and prints its docs.'''
 	((symbol, _), stack) = S
 	word = dictionary[symbol]
-	print(getdoc(word))
+	print(HELP_TEMPLATE % (symbol, getdoc(word), symbol))
 	return stack, expression, dictionary