tests/heredoctest.py

mergetools: drop incorrect quoting of diffargs variables

72a89cf86fcd introduced automatic quoting of diffargs in a not entirely
backwards compatible way. That rendered some of the configuration in
mergetools.rc invalid. It would fail when running extdiff on a single file with
a name that needed quoting.

Before:

  $ hg config merge-tools.meld.diffargs
  -a --label='$plabel1' $parent --label='$clabel' $child
  $ hg --config extdiff.meld= -v --debug meld
  running "/usr/bin/meld -a --label=''sp ace@0'' '.../Z.b7a65a1d2f84/sp ace' --label=''sp ace'' '.../sp ace'" in ...
  meld: error: too many arguments (wanted 0-3, got 4)

After:

  $ hg config merge-tools.meld.diffargs
  -a --label=$plabel1 $parent --label=$clabel $child
  $ hg --config extdiff.meld= -v --debug meld
  running "/usr/bin/meld -a --label='sp ace@0' '.../Z.b7a65a1d2f84/sp ace' --label='sp ace' '.../sp ace'" in ...
(success)

import sys

globalvars = {}
lines = sys.stdin.readlines()
while lines:
    l = lines.pop(0)
    if l.startswith('SALT'):
        print l[:-1]
    elif l.startswith('>>> '):
        snippet = l[4:]
        while lines and lines[0].startswith('... '):
            l = lines.pop(0)
            snippet += l[4:]
        c = compile(snippet, '<heredoc>', 'single')
        try:
            exec c in globalvars
        except Exception, inst:
            print repr(inst)