hg

perf: use locally defined revlog option list for Mercurial earlier than 3.7

Before this patch, referring commands.debugrevlogopts prevents perf.py
from being loaded by Mercurial earlier than 3.7 (or 5606f7d0d063),
because it isn't available in such Mercurial, even though
cmdutil.openrevlog(), a user of these options, has been available
since 1.9 (or a79fea6b3e77).

In addition to it, there are some code paths for Mercurial earlier
than 3.7. For example, setting "_prereadsize" attribute in perfindex()
and perfnodelookup() is effective only with hg earlier than 1.8 (or
61c9bc3da402).

But just "using locally defined revlog option list" might cause
unexpected behavior at runtime. If --dir option is specified to
cmdutil.openrevlog() of Mercurial earlier than 3.5 (or 49c583ca48c4),
it is silently ignored without any warning or so.

  ============ ============ ===== ===============
                                  debugrevlogopts
  hg version   openrevlog() --dir of commands
  ============ ============ ===== ===============
  3.7 or later     o          o         o
  3.5 or later     o          o         x
  1.9 or later     o          x         x
  earlier          x          x         x
  ============ ============ ===== ===============

Therefore, this patch does:

  - use locally defined option list, if commands.debugrevlogopts isn't
    available (for Mercurial earlier than 3.7)

  - wrap cmdutil.openrevlog(), if it is ambiguous whether
    cmdutil.openrevlog() can recognize --dir option correctly
    (for Mercurial earlier than 3.5)

    This wrapper function aborts execution, if:
    - --dir option is specified, and
    - localrepository doesn't have "dirlog" attribute, which indicates
      that localrepository has a function for '--dir'

    BTW, extensions.wrapfunction() has been available since 1.1 (or
    0ab5f21c390b), and this seems old enough for "historical
    portability" of perf.py, which has been available since 1.1 (or
    eb240755386d).

#!/usr/bin/env python
#
# mercurial - scalable distributed SCM
#
# Copyright 2005-2007 Matt Mackall <[e-mail]>
#
# This software may be used and distributed according to the terms of the
# GNU General Public License version 2 or any later version.

import os
import sys

if os.environ.get('HGUNICODEPEDANTRY', False):
    try:
        reload(sys)
        sys.setdefaultencoding("undefined")
    except NameError:
        pass

libdir = '@LIBDIR@'

if libdir != '@' 'LIBDIR' '@':
    if not os.path.isabs(libdir):
        libdir = os.path.join(os.path.dirname(os.path.realpath(__file__)),
                              libdir)
        libdir = os.path.abspath(libdir)
    sys.path.insert(0, libdir)

# enable importing on demand to reduce startup time
try:
    if sys.version_info[0] < 3:
        from mercurial import demandimport; demandimport.enable()
except ImportError:
    sys.stderr.write("abort: couldn't find mercurial libraries in [%s]\n" %
                     ' '.join(sys.path))
    sys.stderr.write("(check your install and PYTHONPATH)\n")
    sys.exit(-1)

import mercurial.util
import mercurial.dispatch

for fp in (sys.stdin, sys.stdout, sys.stderr):
    mercurial.util.setbinary(fp)

mercurial.dispatch.run()