[Bug 5301] New: HGPLAIN + configured extdiff + help -k = traceback

[mercurial-bugs at selenic.com]

https://bz.mercurial-scm.org/show_bug.cgi?id=5301

            Bug ID: 5301
           Summary: HGPLAIN + configured extdiff + help -k = traceback
           Product: Mercurial
           Version: unspecified
          Hardware: PC
                OS: Linux
            Status: UNCONFIRMED
          Severity: feature
          Priority: wish
         Component: extdiff
          Assignee: bugzilla at selenic.com
          Reporter: hg at pewpew.net
                CC: mercurial-devel at selenic.com

> HGRCPATH=/dev/null HGPLAIN=1 ./hg --config extensions.extdiff= --config extdiff.cmd.x=y help -k asdfg
** unknown exception encountered, please report by visiting
** https://mercurial-scm.org/wiki/BugTracker
** Python 2.7.6 (default, Jun 22 2015, 17:58:13) [GCC 4.8.2]
** Mercurial Distributed SCM (version 3.8.4+3-a7d1532b26a1)
** Extensions loaded: extdiff
Traceback (most recent call last):
  File "./hg", line 43, in <module>
    mercurial.dispatch.run()
  File "/usr/local/google/home/spectral/src/hg/hg/mercurial/dispatch.py", line
59, in run
    sys.exit((dispatch(request(sys.argv[1:])) or 0) & 255)
  File "/usr/local/google/home/spectral/src/hg/hg/mercurial/dispatch.py", line
125, in dispatch
    ret = _runcatch(req)
  File "/usr/local/google/home/spectral/src/hg/hg/mercurial/dispatch.py", line
204, in _runcatch
    return _dispatch(req)
  File "/usr/local/google/home/spectral/src/hg/hg/mercurial/dispatch.py", line
887, in _dispatch
    cmdpats, cmdoptions)
  File "/usr/local/google/home/spectral/src/hg/hg/mercurial/dispatch.py", line
632, in runcommand
    ret = _runcommand(ui, options, cmd, d)
  File "/usr/local/google/home/spectral/src/hg/hg/mercurial/dispatch.py", line
1017, in _runcommand
    return checkargs()
  File "/usr/local/google/home/spectral/src/hg/hg/mercurial/dispatch.py", line
978, in checkargs
    return cmdfunc()
  File "/usr/local/google/home/spectral/src/hg/hg/mercurial/dispatch.py", line
884, in <lambda>
    d = lambda: util.checksignature(func)(ui, *args, **cmdoptions)
  File "/usr/local/google/home/spectral/src/hg/hg/mercurial/util.py", line
1005, in check
    return func(*args, **kwargs)
  File "/usr/local/google/home/spectral/src/hg/hg/mercurial/commands.py", line
4599, in help_
    text = help.help_(ui, name, subtopic=subtopic, **opts)
  File "/usr/local/google/home/spectral/src/hg/hg/mercurial/help.py", line 558,
in help_
    matches = topicmatch(ui, name or '')
  File "/usr/local/google/home/spectral/src/hg/hg/mercurial/help.py", line 141,
in topicmatch
    if kw in cmd or lowercontains(summary) or lowercontains(docs):
  File "/usr/local/google/home/spectral/src/hg/hg/mercurial/help.py", line 121,
in lowercontains
    return kw in encoding.lower(container)  # translated in helptable
  File "/usr/local/google/home/spectral/src/hg/hg/mercurial/encoding.py", line
333, in lower
    return asciilower(s)
TypeError: must be str, not unicode

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