management of help functions improved.

src/appengine/__init__.py

@@ -175,7 +175,28 @@ class Commands(Thread):
 
         if module == "":
             if method == 'help':
-                return self.list_modules()
+                # No argument was given to the help function
+                if len(args) == 0 and len(kwargs) == 0:
+                    msg  = "Type 'help <module>' to have the list of module's functions.\n"
+                    msg += "Type 'help <module>.<function>' to documentation of a specific function.\n"
+                    success, ret = self.list_modules()
+                    return success, msg + ret
+                else:
+                    # 1 argument has been provided
+                    if len(args) > 0:
+                        arg = args[0]
+                    else:
+                        arg = list(kwargs.keys())[0]
+                    spl = arg.split(".", 1)
+
+                    # help <module>
+                    if len(spl) == 1:
+                        module = arg
+                    # help <module>.<method>
+                    else:
+                        module = spl[0]
+                        args = [spl[1]]
+                        kwargs = {}
             else:
                 module = self.defmod