hg

templater: add "diff" template function

"diff" allows to embed changes in the target revision into template
output, even if the command itself doesn't take "--patch" option

Combination of "[committemplate]" configuration and "diff" template
function can achieve the feature like issue231 ("option to have diff
displayed in commit editor buffer")

    http://bz.selenic.com/show_bug.cgi?id=231

For example, templating below can be used to add each "diff" output
lines "HG: " prefix::

      {splitlines(diff) % 'HG: {line}\n'}

This patch implements "diff" not as "a template keyword" but as "a
template function" to take include/exclude patterns at runtime.

It allows to specify target files of command (by -I/-X command line
options) and "diff" separately.

#!/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):
    reload(sys)
    sys.setdefaultencoding("undefined")


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:
    from mercurial import demandimport; demandimport.enable()
except ImportError:
    import sys
    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()