gendoc: guarantee that all commands were processed

The new logic renders the commands belonging to each category in turn.
Commands with an unregistered category are at risk of getting skipped
because their category is not in the list. By comparing the list of all
commands to a log of processed commands, we can detect commands with
unregistered categories and fail with an error message.

Differential Revision: https://phab.mercurial-scm.org/D6327

doc/gendoc.py

@@ -194,13 +194,19 b' def commandprinter(ui, cmdtable, section'
         helpcategory = details[0].helpcategory
         return helpcategory or help.registrar.command.CATEGORY_NONE
 
+    cmdsbycategory = {category: [] for category in help.CATEGORY_ORDER}
+    for cmd in cmds:
+        # If a command category wasn't registered, the command won't get
+        # rendered below, so we raise an AssertionError.
+        if helpcategory(cmd) not in cmdsbycategory:
+            raise AssertionError(
+                "The following command did not register its (category) in "
+                "help.CATEGORY_ORDER: %s (%s)" % (cmd, helpcategory(cmd)))
+        cmdsbycategory[helpcategory(cmd)].append(cmd)
+
     # Print the help for each command. We present the commands grouped by
     # category, and we use help.CATEGORY_ORDER as a guide for a helpful order
     # in which to present the categories.
-    cmdsbycategory = {category: [] for category in help.CATEGORY_ORDER}
-    for cmd in cmds:
-        cmdsbycategory[helpcategory(cmd)].append(cmd)
-
     for category in help.CATEGORY_ORDER:
         categorycmds = cmdsbycategory[category]
         if not categorycmds:
@@ -250,7 +256,6 b' def commandprinter(ui, cmdtable, section'
             if d[b'aliases']:
                 ui.write(_(b"    aliases: %s\n\n") % b" ".join(d[b'aliases']))
 
-
 def allextensionnames():
     return set(extensions.enabled().keys()) | set(extensions.disabled().keys())