tests/test-check-help.t

narrow: factor out logic to create cg while widening into separate fn

This patch takes out the logic which generates a changegroup for widening a
narrow clone when ellipses are disabled. This is done because future patches
will introduce a narrow_widen() wireprotocol command which will send a
bundle2 with changegroup and will use this function.

The new function for now returns just the changegroup for compatibility with
existing code, but in future patches, when we establish a wireprotocol command
and call this function from there, this will return the required bundle2.

Differential Revision: https://phab.mercurial-scm.org/D4786

#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 os, msvcrt
  >     msvcrt.setmode(sys.stdout.fileno(), os.O_BINARY)
  > 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):
  >     print(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