mercurial/node.py

tests: make filterpyflakes.py read target files relatively to cwd

Before this patch, 'filterpyflakes.py' reads target files relatively
to own location.

But this prevents third party tools from using it in own source tree,
because their files are placed separately from 'filterpyflakes.py'.

In fact, 'test-check-pyflakes.t', which is the only user of
'filterpyflakes.py', changes current working directory (cwd) to the
root of "test target" source tree before using it. Therefore,
composing the root of source tree in 'filterpyflakes.py' is redundant.

This patch makes 'filterpyflakes.py' read target files relatively to
cwd by invoking 'open()' without any path composition. This also
removes importing 'os' module, because there is no user of it after
this patch.

This is a one of preparation of issue4677.

# node.py - basic nodeid manipulation for mercurial
#
# Copyright 2005, 2006 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.

from __future__ import absolute_import

import binascii

nullrev = -1
nullid = "\0" * 20

# pseudo identifiers for working directory
# (they are experimental, so don't add too many dependencies on them)
wdirrev = 0x7fffffff
wdirid = "\xff" * 20

# This ugly style has a noticeable effect in manifest parsing
hex = binascii.hexlify
bin = binascii.unhexlify

def short(node):
    return hex(node[:6])