[Bug 4638] New: templates: {word(0, author)} stack traces

[mercurial-bugs at selenic.com]

http://bz.selenic.com/show_bug.cgi?id=4638

          Priority: normal
            Bug ID: 4638
                CC: mercurial-devel at selenic.com
          Assignee: bugzilla at selenic.com
           Summary: templates: {word(0, author)} stack traces
          Severity: bug
    Classification: Unclassified
                OS: Linux
          Reporter: jordigh at octave.org
          Hardware: PC
            Status: UNCONFIRMED
           Version: default branch
         Component: templater
           Product: Mercurial

log -T "{word(0, author)}\n"

  File "/home/jordi/coding/vcs/mercurial-source/mercurial/commands.py", line
4590, in log
    displayer.show(ctx, copies=copies, matchfn=revmatchfn)
  File "/home/jordi/coding/vcs/mercurial-source/mercurial/cmdutil.py", line
1095, in show
    self._show(ctx, copies, matchfn, props)
  File "/home/jordi/coding/vcs/mercurial-source/mercurial/cmdutil.py", line
1422, in _show
    self.ui.write(templater.stringify(self.t(key, **props)))
  File "/home/jordi/coding/vcs/mercurial-source/mercurial/templatefilters.py",
line 328, in stringify
    return "".join([stringify(t) for t in thing if t is not None])
  File "/home/jordi/coding/vcs/mercurial-source/mercurial/util.py", line 537,
in increasingchunks
    for chunk in source:
  File "/home/jordi/coding/vcs/mercurial-source/mercurial/templater.py", line
598, in _flatten
    for i in thing:
  File "/home/jordi/coding/vcs/mercurial-source/mercurial/templater.py", line
187, in runtemplate
    yield func(context, mapping, data)
  File "/home/jordi/coding/vcs/mercurial-source/mercurial/templater.py", line
542, in word
    num = int(stringify(args[0][0](context, mapping, args[0][1])))
ValueError: invalid literal for int() with base 10: ''

The problem with that line is that args[0][0] can be runsymbol instead of
runstring if there's no quoting in the first argument, which does the
completely wrong thing, returning a None instead of the necessary number.

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