Bug 1749747 - Don't allow commit messages starting with WIP. r=sheehan

Differential Revision: https://phabricator.services.mozilla.com/D135712

--HG--
extra : moz-landing-system : lando

hghooks/mozhghooks/commit-message.py

@@ -104,11 +104,15 @@ def message(fmt):
                 b"'r=' instead.")
         return False
 
+    desc_lower = desc.lower()
+    if desc_lower.startswith(b'wip:'):
+        message(b"Rev %(rev)s seems to be marked as WIP.")
+        return False
+
     for r in goodMessage:
         if r.search(firstline):
             return True
 
-    desc_lower = desc.lower()
     if desc_lower.startswith((b'merge', b'merging', b'automated merge')):
         if len(c.parents()) == 2:
             return True