view hgext/win32text.py @ 43385:6469c23a40a2 stable

fsmonitor: refresh pywatchman with upstream

This commit vendors pywatchman commit 259dc66dc9591f9b7ce76d0275bb1065f390c9b1
from upstream without modifications. The previously vendored pywatchman
from changeset 16f4b341288d was from Git commit c77452.

This commit effectively undoes the following Mercurial changesets:

* dd35abc409ee fsmonitor: correct an error message
* b1f62cd39b5c fsmonitor: layer on another hack in bser.c for os.stat()
  compat (issue5811)
* c31ce080eb75 py3: convert arguments, cwd and env to native strings when
  spawning subprocess
* 876494fd967d cleanup: delete lots of unused local variables
* 57264906a996 watchman: add the possibility to set the exact watchman
  binary location

The newly-vendored code has support for specifying the binary location,
so 57264906a996 does not need applied. But we do need to modify our
code to specify a proper argument name.

876494fd967d is not important, so it will be ignored.

c31ce080eb75 globally changed the code base to always pass
str to subprocess. But pywatchman's code is Python 3 clean, so
we don't need to do this.

This leaves dd35abc409ee and b1f62cd39b5c, which will be re-applied in
subsequent commits.

Differential Revision: https://phab.mercurial-scm.org/D7201

# win32text.py - LF <-> CRLF/CR translation utilities for Windows/Mac users
#
#  Copyright 2005, 2007-2009 Matt Mackall <[e-mail]> and others
#
# This software may be used and distributed according to the terms of the
# GNU General Public License version 2 or any later version.

'''perform automatic newline conversion (DEPRECATED)

  Deprecation: The win32text extension requires each user to configure
  the extension again and again for each clone since the configuration
  is not copied when cloning.

  We have therefore made the ``eol`` as an alternative. The ``eol``
  uses a version controlled file for its configuration and each clone
  will therefore use the right settings from the start.

To perform automatic newline conversion, use::

  [extensions]
  win32text =
  [encode]
  ** = cleverencode:
  # or ** = macencode:

  [decode]
  ** = cleverdecode:
  # or ** = macdecode:

If not doing conversion, to make sure you do not commit CRLF/CR by accident::

  [hooks]
  pretxncommit.crlf = python:hgext.win32text.forbidcrlf
  # or pretxncommit.cr = python:hgext.win32text.forbidcr

To do the same check on a server to prevent CRLF/CR from being
pushed or pulled::

  [hooks]
  pretxnchangegroup.crlf = python:hgext.win32text.forbidcrlf
  # or pretxnchangegroup.cr = python:hgext.win32text.forbidcr
'''

from __future__ import absolute_import

import re
from mercurial.i18n import _
from mercurial.node import short
from mercurial import (
    pycompat,
    registrar,
)
from mercurial.utils import stringutil

# Note for extension authors: ONLY specify testedwith = 'ships-with-hg-core' for
# extensions which SHIP WITH MERCURIAL. Non-mainline extensions should
# be specifying the version(s) of Mercurial they are tested with, or
# leave the attribute unspecified.
testedwith = b'ships-with-hg-core'

configtable = {}
configitem = registrar.configitem(configtable)

configitem(
    b'win32text', b'warn', default=True,
)

# regexp for single LF without CR preceding.
re_single_lf = re.compile(b'(^|[^\r])\n', re.MULTILINE)

newlinestr = {b'\r\n': b'CRLF', b'\r': b'CR'}
filterstr = {b'\r\n': b'clever', b'\r': b'mac'}


def checknewline(s, newline, ui=None, repo=None, filename=None):
    # warn if already has 'newline' in repository.
    # it might cause unexpected eol conversion.
    # see issue 302:
    #   https://bz.mercurial-scm.org/302
    if newline in s and ui and filename and repo:
        ui.warn(
            _(
                b'WARNING: %s already has %s line endings\n'
                b'and does not need EOL conversion by the win32text plugin.\n'
                b'Before your next commit, please reconsider your '
                b'encode/decode settings in \nMercurial.ini or %s.\n'
            )
            % (filename, newlinestr[newline], repo.vfs.join(b'hgrc'))
        )


def dumbdecode(s, cmd, **kwargs):
    checknewline(s, b'\r\n', **kwargs)
    # replace single LF to CRLF
    return re_single_lf.sub(b'\\1\r\n', s)


def dumbencode(s, cmd):
    return s.replace(b'\r\n', b'\n')


def macdumbdecode(s, cmd, **kwargs):
    checknewline(s, b'\r', **kwargs)
    return s.replace(b'\n', b'\r')


def macdumbencode(s, cmd):
    return s.replace(b'\r', b'\n')


def cleverdecode(s, cmd, **kwargs):
    if not stringutil.binary(s):
        return dumbdecode(s, cmd, **kwargs)
    return s


def cleverencode(s, cmd):
    if not stringutil.binary(s):
        return dumbencode(s, cmd)
    return s


def macdecode(s, cmd, **kwargs):
    if not stringutil.binary(s):
        return macdumbdecode(s, cmd, **kwargs)
    return s


def macencode(s, cmd):
    if not stringutil.binary(s):
        return macdumbencode(s, cmd)
    return s


_filters = {
    b'dumbdecode:': dumbdecode,
    b'dumbencode:': dumbencode,
    b'cleverdecode:': cleverdecode,
    b'cleverencode:': cleverencode,
    b'macdumbdecode:': macdumbdecode,
    b'macdumbencode:': macdumbencode,
    b'macdecode:': macdecode,
    b'macencode:': macencode,
}


def forbidnewline(ui, repo, hooktype, node, newline, **kwargs):
    halt = False
    seen = set()
    # we try to walk changesets in reverse order from newest to
    # oldest, so that if we see a file multiple times, we take the
    # newest version as canonical. this prevents us from blocking a
    # changegroup that contains an unacceptable commit followed later
    # by a commit that fixes the problem.
    tip = repo[b'tip']
    for rev in pycompat.xrange(
        repo.changelog.tiprev(), repo[node].rev() - 1, -1
    ):
        c = repo[rev]
        for f in c.files():
            if f in seen or f not in tip or f not in c:
                continue
            seen.add(f)
            data = c[f].data()
            if not stringutil.binary(data) and newline in data:
                if not halt:
                    ui.warn(
                        _(
                            b'attempt to commit or push text file(s) '
                            b'using %s line endings\n'
                        )
                        % newlinestr[newline]
                    )
                ui.warn(_(b'in %s: %s\n') % (short(c.node()), f))
                halt = True
    if halt and hooktype == b'pretxnchangegroup':
        crlf = newlinestr[newline].lower()
        filter = filterstr[newline]
        ui.warn(
            _(
                b'\nTo prevent this mistake in your local repository,\n'
                b'add to Mercurial.ini or .hg/hgrc:\n'
                b'\n'
                b'[hooks]\n'
                b'pretxncommit.%s = python:hgext.win32text.forbid%s\n'
                b'\n'
                b'and also consider adding:\n'
                b'\n'
                b'[extensions]\n'
                b'win32text =\n'
                b'[encode]\n'
                b'** = %sencode:\n'
                b'[decode]\n'
                b'** = %sdecode:\n'
            )
            % (crlf, crlf, filter, filter)
        )
    return halt


def forbidcrlf(ui, repo, hooktype, node, **kwargs):
    return forbidnewline(ui, repo, hooktype, node, b'\r\n', **kwargs)


def forbidcr(ui, repo, hooktype, node, **kwargs):
    return forbidnewline(ui, repo, hooktype, node, b'\r', **kwargs)


def reposetup(ui, repo):
    if not repo.local():
        return
    for name, fn in pycompat.iteritems(_filters):
        repo.adddatafilter(name, fn)


def extsetup(ui):
    # deprecated config: win32text.warn
    if ui.configbool(b'win32text', b'warn'):
        ui.warn(
            _(
                b"win32text is deprecated: "
                b"https://mercurial-scm.org/wiki/Win32TextExtension\n"
            )
        )