tests/test-check-help.t

windows: use util.localpath for repo-relative paths in getuipathfn()

Now that we have a single place that translates from internal path
representation (slash-separated) to UI representation
(i.e. scmutil.getuipathfn()), let's switch that over to using
util.localpath for absolute paths. I don't expect any test impact on
Windows because we still respect ui.slash, which is set by the test
runner.

As Yuya pointed out, a997163e7fae (status: extract helper for
producing relative or absolute path for UI, 2019-01-29) accidentally
changed to slash-separated paths on Windows because it used used to
use repo.pathto(f, cwd='') (which calls util.localpath()) and after
that patch it just prints the filename without any
transformation. This patch should fix that regression.

Differential Revision: https://phab.mercurial-scm.org/D5935

#require test-repo

  $ . "$TESTDIR/helpers-testrepo.sh"

  $ cat <<'EOF' > scanhelptopics.py
  > from __future__ import absolute_import, print_function
  > import re
  > import sys
  > if sys.platform == "win32":
  >     import msvcrt
  >     import os
  >     msvcrt.setmode(sys.stdout.fileno(), os.O_BINARY)
  > stdout = getattr(sys.stdout, 'buffer', sys.stdout)
  > topics = set()
  > topicre = re.compile(br':hg:`help ([a-z0-9\-.]+)`')
  > for fname in sys.argv:
  >     with open(fname, 'rb') as f:
  >         topics.update(m.group(1) for m in topicre.finditer(f.read()))
  > for s in sorted(topics):
  >     stdout.write(b'%s\n' % s)
  > EOF

  $ cd "$TESTDIR"/..

Check if ":hg:`help TOPIC`" is valid:
(use "xargs -n1 -t" to see which help commands are executed)

  $ testrepohg files 'glob:{hgdemandimport,hgext,mercurial}/**/*.py' \
  > | sed 's|\\|/|g' \
  > | xargs "$PYTHON" "$TESTTMP/scanhelptopics.py" \
  > | xargs -n1 hg help --config extensions.phabricator= > /dev/null