test: add pyflakes checking for unable to detect undefined names

tests/filterpyflakes.py

@@ -1,31 +1,32 b''
 #!/usr/bin/env python
 
 # Filter output by pyflakes to control which warnings we check
 
 import sys, re
 
 def makekey(message):
     # "path/file:line: message"
     match = re.search(r"(line \d+)", message)
     line = ''
     if match:
         line = match.group(0)
         message = re.sub(r"(line \d+)", '', message)
     return re.sub(r"([^:]*):([^:]+):([^']*)('[^']*')(.*)$",
                   r'\3:\5:\4:\1:\2:' + line,
                   message)
 
 lines = []
 for line in sys.stdin:
     # We whitelist tests
     pats = [
             r"imported but unused",
             r"local variable '.*' is assigned to but never used",
+            r"unable to detect undefined names",
            ]
     if not re.search('|'.join(pats), line):
         continue
     lines.append(line)
 
 for line in sorted(lines, key = makekey):
     sys.stdout.write(line)
 print

tests/test-check-pyflakes.t

@@ -1,11 +1,15 b''
   $ "$TESTDIR/hghave" pyflakes || exit 80
   $ cd $(dirname $TESTDIR)
   $ pyflakes mercurial hgext 2>&1 | $TESTDIR/filterpyflakes.py
   mercurial/hgweb/server.py:*: 'activeCount' imported but unused (glob)
   mercurial/commands.py:*: 'base85' imported but unused (glob)
   mercurial/commands.py:*: 'bdiff' imported but unused (glob)
   mercurial/commands.py:*: 'mpatch' imported but unused (glob)
   mercurial/commands.py:*: 'osutil' imported but unused (glob)
   mercurial/revlog.py:*: 'short' imported but unused (glob)
+  hgext/inotify/linux/__init__.py:*: 'from _inotify import *' used; unable to detect undefined names (glob)
+  mercurial/util.py:*: 'from posix import *' used; unable to detect undefined names (glob)
+  mercurial/windows.py:*: 'from win32 import *' used; unable to detect undefined names (glob)
+  mercurial/util.py:*: 'from windows import *' used; unable to detect undefined names (glob)