hgext/eol.py
author Patrick Mezard <pmezard@gmail.com>
Sun, 13 Mar 2011 15:07:44 +0100
changeset 13617 9cb1a42cd4b3
parent 13616 e6f93ca9ce86
child 13625 8aec2516602b
permissions -rw-r--r--
eol: rename hook into checkheadshook, add checkallhook (issue2665) "hook" is still an alias for "checkheadshook".
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"""automatically manage newlines in repository files
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This extension allows you to manage the type of line endings (CRLF or
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LF) that are used in the repository and in the local working
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directory. That way you can get CRLF line endings on Windows and LF on
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Unix/Mac, thereby letting everybody use their OS native line endings.
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The extension reads its configuration from a versioned ``.hgeol``
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configuration file found in the root of the working copy. The
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``.hgeol`` file use the same syntax as all other Mercurial
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configuration files. It uses two sections, ``[patterns]`` and
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``[repository]``.
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The ``[patterns]`` section specifies how line endings should be
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converted between the working copy and the repository. The format is
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specified by a file pattern. The first match is used, so put more
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specific patterns first. The available line endings are ``LF``,
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``CRLF``, and ``BIN``.
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Files with the declared format of ``CRLF`` or ``LF`` are always
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checked out and stored in the repository in that format and files
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declared to be binary (``BIN``) are left unchanged. Additionally,
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``native`` is an alias for checking out in the platform's default line
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ending: ``LF`` on Unix (including Mac OS X) and ``CRLF`` on
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Windows. Note that ``BIN`` (do nothing to line endings) is Mercurial's
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default behaviour; it is only needed if you need to override a later,
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more general pattern.
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The optional ``[repository]`` section specifies the line endings to
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use for files stored in the repository. It has a single setting,
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``native``, which determines the storage line endings for files
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declared as ``native`` in the ``[patterns]`` section. It can be set to
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``LF`` or ``CRLF``. The default is ``LF``. For example, this means
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that on Windows, files configured as ``native`` (``CRLF`` by default)
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will be converted to ``LF`` when stored in the repository. Files
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declared as ``LF``, ``CRLF``, or ``BIN`` in the ``[patterns]`` section
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are always stored as-is in the repository.
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Example versioned ``.hgeol`` file::
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  [patterns]
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  **.py = native
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  **.vcproj = CRLF
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  **.txt = native
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  Makefile = LF
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  **.jpg = BIN
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  [repository]
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  native = LF
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.. note::
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   The rules will first apply when files are touched in the working
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   copy, e.g. by updating to null and back to tip to touch all files.
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The extension uses an optional ``[eol]`` section in your hgrc file
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(not the ``.hgeol`` file) for settings that control the overall
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behavior. There are two settings:
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- ``eol.native`` (default ``os.linesep``) can be set to ``LF`` or
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  ``CRLF`` to override the default interpretation of ``native`` for
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  checkout. This can be used with :hg:`archive` on Unix, say, to
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  generate an archive where files have line endings for Windows.
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- ``eol.only-consistent`` (default True) can be set to False to make
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  the extension convert files with inconsistent EOLs. Inconsistent
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  means that there is both ``CRLF`` and ``LF`` present in the file.
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  Such files are normally not touched under the assumption that they
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  have mixed EOLs on purpose.
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The extension provides ``cleverencode:`` and ``cleverdecode:`` filters
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like the deprecated win32text extension does. This means that you can
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disable win32text and enable eol and your filters will still work. You
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only need to these filters until you have prepared a ``.hgeol`` file.
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The ``win32text.forbid*`` hooks provided by the win32text extension
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have been unified into a single hook named ``eol.checkheadshook``. The
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hook will lookup the expected line endings from the ``.hgeol`` file,
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which means you must migrate to a ``.hgeol`` file first before using
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the hook. ``eol.checkheadshook`` only checks heads, intermediate
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invalid revisions will be pushed. To forbid them completely, use the
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``eol.checkallhook`` hook. These hooks are best used as
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``pretxnchangegroup`` hooks.
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See :hg:`help patterns` for more information about the glob patterns
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used.
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"""
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from mercurial.i18n import _
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from mercurial import util, config, extensions, match, error
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import re, os
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# Matches a lone LF, i.e., one that is not part of CRLF.
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singlelf = re.compile('(^|[^\r])\n')
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# Matches a single EOL which can either be a CRLF where repeated CR
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# are removed or a LF. We do not care about old Machintosh files, so a
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# stray CR is an error.
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eolre = re.compile('\r*\n')
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def inconsistenteol(data):
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    return '\r\n' in data and singlelf.search(data)
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def tolf(s, params, ui, **kwargs):
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    """Filter to convert to LF EOLs."""
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    if util.binary(s):
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        return s
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    if ui.configbool('eol', 'only-consistent', True) and inconsistenteol(s):
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        return s
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    return eolre.sub('\n', s)
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def tocrlf(s, params, ui, **kwargs):
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    """Filter to convert to CRLF EOLs."""
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    if util.binary(s):
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        return s
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    if ui.configbool('eol', 'only-consistent', True) and inconsistenteol(s):
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        return s
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    return eolre.sub('\r\n', s)
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def isbinary(s, params):
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    """Filter to do nothing with the file."""
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    return s
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filters = {
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    'to-lf': tolf,
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    'to-crlf': tocrlf,
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    'is-binary': isbinary,
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    # The following provide backwards compatibility with win32text
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    'cleverencode:': tolf,
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    'cleverdecode:': tocrlf
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}
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class eolfile(object):
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    def __init__(self, ui, root, data):
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        self._decode = {'LF': 'to-lf', 'CRLF': 'to-crlf', 'BIN': 'is-binary'}
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        self._encode = {'LF': 'to-lf', 'CRLF': 'to-crlf', 'BIN': 'is-binary'}
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   136
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        self.cfg = config.config()
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        # Our files should not be touched. The pattern must be
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        # inserted first override a '** = native' pattern.
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        self.cfg.set('patterns', '.hg*', 'BIN')
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        # We can then parse the user's patterns.
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        self.cfg.parse('.hgeol', data)
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        isrepolf = self.cfg.get('repository', 'native') != 'CRLF'
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        self._encode['NATIVE'] = isrepolf and 'to-lf' or 'to-crlf'
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   146
        iswdlf = ui.config('eol', 'native', os.linesep) in ('LF', '\n')
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        self._decode['NATIVE'] = iswdlf and 'to-lf' or 'to-crlf'
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   148
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        include = []
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        exclude = []
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        for pattern, style in self.cfg.items('patterns'):
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            key = style.upper()
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            if key == 'BIN':
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                exclude.append(pattern)
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            else:
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                include.append(pattern)
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        # This will match the files for which we need to care
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        # about inconsistent newlines.
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        self.match = match.match(root, '', [], include, exclude)
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   160
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    def setfilters(self, ui):
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        for pattern, style in self.cfg.items('patterns'):
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            key = style.upper()
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            try:
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                ui.setconfig('decode', pattern, self._decode[key])
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                ui.setconfig('encode', pattern, self._encode[key])
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            except KeyError:
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                ui.warn(_("ignoring unknown EOL style '%s' from %s\n")
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                        % (style, self.cfg.source('patterns', pattern)))
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    def checkrev(self, repo, ctx, files):
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        for f in files:
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            if f not in ctx:
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                continue
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            for pattern, style in self.cfg.items('patterns'):
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                if not match.match(repo.root, '', [pattern])(f):
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                    continue
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                target = self._encode[style.upper()]
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                data = ctx[f].data()
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                if target == "to-lf" and "\r\n" in data:
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                    raise util.Abort(_("%s should not have CRLF line endings")
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                                     % f)
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                elif target == "to-crlf" and singlelf.search(data):
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                    raise util.Abort(_("%s should not have LF line endings")
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                                     % f)
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                # Ignore other rules for this file
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                break
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   188
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   189
def parseeol(ui, repo, nodes):
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    try:
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   191
        for node in nodes:
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            try:
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   193
                if node is None:
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                    # Cannot use workingctx.data() since it would load
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   195
                    # and cache the filters before we configure them.
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   196
                    data = repo.wfile('.hgeol').read()
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   197
                else:
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   198
                    data = repo[node]['.hgeol'].data()
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   199
                return eolfile(ui, repo.root, data)
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   200
            except (IOError, LookupError):
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   201
                pass
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   202
    except error.ParseError, inst:
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   203
        ui.warn(_("warning: ignoring .hgeol file due to parse error "
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   204
                  "at %s: %s\n") % (inst.args[1], inst.args[0]))
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   205
    return None
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   206
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   207
def _checkhook(ui, repo, node, headsonly):
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   208
    # Get revisions to check and touched files at the same time
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   209
    files = set()
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   210
    revs = set()
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   211
    for rev in xrange(repo[node].rev(), len(repo)):
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   212
        ctx = repo[rev]
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   213
        files.update(ctx.files())
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   214
        revs.add(rev)
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   215
        if headsonly:
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   216
            for pctx in ctx.parents():
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   217
                revs.discard(pctx.rev())
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   218
    for rev in revs:
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   219
        ctx = repo[rev]
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   220
        eol = parseeol(ui, repo, [ctx.node()])
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   221
        if eol:
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   222
            eol.checkrev(repo, ctx, files)
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   223
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   224
def checkallhook(ui, repo, node, hooktype, **kwargs):
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diff changeset
   225
    """verify that files have expected EOLs"""
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diff changeset
   226
    _checkhook(ui, repo, node, False)
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   227
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   228
def checkheadshook(ui, repo, node, hooktype, **kwargs):
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diff changeset
   229
    """verify that files have expected EOLs"""
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   230
    _checkhook(ui, repo, node, True)
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   231
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   232
# "checkheadshook" used to be called "hook"
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   233
hook = checkheadshook
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diff changeset
   234
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diff changeset
   235
def preupdate(ui, repo, hooktype, parent1, parent2):
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diff changeset
   236
    #print "preupdate for %s: %s -> %s" % (repo.root, parent1, parent2)
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   237
    repo.loadeol([parent1])
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diff changeset
   238
    return False
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   239
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   240
def uisetup(ui):
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diff changeset
   241
    ui.setconfig('hooks', 'preupdate.eol', preupdate)
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   242
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   243
def extsetup(ui):
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diff changeset
   244
    try:
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   245
        extensions.find('win32text')
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diff changeset
   246
        raise util.Abort(_("the eol extension is incompatible with the "
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diff changeset
   247
                           "win32text extension"))
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diff changeset
   248
    except KeyError:
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   249
        pass
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   250
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diff changeset
   251
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   252
def reposetup(ui, repo):
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diff changeset
   253
    uisetup(repo.ui)
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diff changeset
   254
    #print "reposetup for", repo.root
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    if not repo.local():
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        return
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    for name, fn in filters.iteritems():
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        repo.adddatafilter(name, fn)
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    ui.setconfig('patch', 'eol', 'auto')
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    class eolrepo(repo.__class__):
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        def loadeol(self, nodes):
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            eol = parseeol(self.ui, self, nodes)
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            if eol is None:
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                return None
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            eol.setfilters(self.ui)
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            return eol.match
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        def _hgcleardirstate(self):
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            self._eolfile = self.loadeol([None, 'tip'])
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            if not self._eolfile:
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                self._eolfile = util.never
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                return
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            try:
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                cachemtime = os.path.getmtime(self.join("eol.cache"))
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            except OSError:
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                cachemtime = 0
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            try:
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                eolmtime = os.path.getmtime(self.wjoin(".hgeol"))
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            except OSError:
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                eolmtime = 0
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            if eolmtime > cachemtime:
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                ui.debug("eol: detected change in .hgeol\n")
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                wlock = None
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                try:
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                    wlock = self.wlock()
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                    for f in self.dirstate:
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                        if self.dirstate[f] == 'n':
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                            # all normal files need to be looked at
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                            # again since the new .hgeol file might no
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                            # longer match a file it matched before
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                            self.dirstate.normallookup(f)
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                    # Touch the cache to update mtime.
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                    self.opener("eol.cache", "w").close()
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                    wlock.release()
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                except error.LockUnavailable:
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                    # If we cannot lock the repository and clear the
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                    # dirstate, then a commit might not see all files
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                    # as modified. But if we cannot lock the
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   306
                    # repository, then we can also not make a commit,
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                    # so ignore the error.
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                    pass
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        def commitctx(self, ctx, error=False):
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            for f in sorted(ctx.added() + ctx.modified()):
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                if not self._eolfile(f):
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                    continue
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                data = ctx[f].data()
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   315
                if util.binary(data):
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   316
                    # We should not abort here, since the user should
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                    # be able to say "** = native" to automatically
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                    # have all non-binary files taken care of.
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   319
                    continue
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   320
                if inconsistenteol(data):
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   321
                    raise util.Abort(_("inconsistent newline style "
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   322
                                       "in %s\n" % f))
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   323
            return super(eolrepo, self).commitctx(ctx, error)
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   324
    repo.__class__ = eolrepo
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   325
    repo._hgcleardirstate()