hgweb: use parsebool for parsing diff query string options

Differential Revision: https://phab.mercurial-scm.org/D875

mercurial/hgweb/webcommands.py

@@ -865,9 +865,10 b' def annotate(web, req, tmpl):'
 
     The ``ignorews``, ``ignorewsamount``, ``ignorewseol``, and
     ``ignoreblanklines`` query string arguments have the same meaning as
-    their ``[annotate]`` config equivalents. A value of ``0`` sets the
-    whitespace option to false. All other values are true. If not defined,
-    the server default settings are used.
+    their ``[annotate]`` config equivalents. It uses the hgrc boolean
+    parsing logic to interpret the value. e.g. ``0`` and ``false`` are
+    false and ``1`` and ``true`` are true. If not defined, the server
+    default settings are used.
 
     The ``fileannotate`` template is rendered.
     """

mercurial/hgweb/webutil.py

@@ -177,12 +177,8 b' def difffeatureopts(req, ui, section):'
     for k in ('ignorews', 'ignorewsamount', 'ignorewseol', 'ignoreblanklines'):
         v = req.form.get(k, [None])[0]
         if v is not None:
-            try:
-                v = bool(int(v))
-            except ValueError:
-                v = True
-
-            setattr(diffopts, k, v)
+            v = util.parsebool(v)
+            setattr(diffopts, k, v if v is not None else True)
 
     return diffopts