text: """automatically manage newlines in repository files
  
  This extension allows you to manage the type of line endings (CRLF or
  LF) that are used in the repository and in the local working
  directory. That way you can get CRLF line endings on Windows and LF on
  Unix/Mac, thereby letting everybody use their OS native line endings.
  
  The extension reads its configuration from a versioned ``.hgeol``
  configuration file found in the root of the working directory. The
  ``.hgeol`` file use the same syntax as all other Mercurial
  configuration files. It uses two sections, ``[patterns]`` and
  ``[repository]``.
  
  The ``[patterns]`` section specifies how line endings should be
  converted between the working directory and the repository. The format is
  specified by a file pattern. The first match is used, so put more
  specific patterns first. The available line endings are ``LF``,
  ``CRLF``, and ``BIN``.
  
  Files with the declared format of ``CRLF`` or ``LF`` are always
  checked out and stored in the repository in that format and files
  declared to be binary (``BIN``) are left unchanged. Additionally,
  ``native`` is an alias for checking out in the platform's default line
  ending: ``LF`` on Unix (including Mac OS X) and ``CRLF`` on
  Windows. Note that ``BIN`` (do nothing to line endings) is Mercurial's
  default behavior; it is only needed if you need to override a later,
  more general pattern.
  
  The optional ``[repository]`` section specifies the line endings to
  use for files stored in the repository. It has a single setting,
  ``native``, which determines the storage line endings for files
  declared as ``native`` in the ``[patterns]`` section. It can be set to
  ``LF`` or ``CRLF``. The default is ``LF``. For example, this means
  that on Windows, files configured as ``native`` (``CRLF`` by default)
  will be converted to ``LF`` when stored in the repository. Files
  declared as ``LF``, ``CRLF``, or ``BIN`` in the ``[patterns]`` section
  are always stored as-is in the repository.
  
  Example versioned ``.hgeol`` file::
  
    [patterns]
    **.py = native
    **.vcproj = CRLF
    **.txt = native
    Makefile = LF
    **.jpg = BIN
  
    [repository]
    native = LF
  
  .. note::
  
     The rules will first apply when files are touched in the working
     directory, e.g. by updating to null and back to tip to touch all files.
  
  The extension uses an optional ``[eol]`` section read from both the
  normal Mercurial configuration files and the ``.hgeol`` file, with the
  latter overriding the former. You can use that section to control the
  overall behavior. There are three settings:
  
  - ``eol.native`` (default ``os.linesep``) can be set to ``LF`` or
    ``CRLF`` to override the default interpretation of ``native`` for
    checkout. This can be used with :hg:`archive` on Unix, say, to
    generate an archive where files have line endings for Windows.
  
  - ``eol.only-consistent`` (default True) can be set to False to make
    the extension convert files with inconsistent EOLs. Inconsistent
    means that there is both ``CRLF`` and ``LF`` present in the file.
    Such files are normally not touched under the assumption that they
    have mixed EOLs on purpose.
  
  - ``eol.fix-trailing-newline`` (default False) can be set to True to
    ensure that converted files end with a EOL character (either ``\\n``
    or ``\\r\\n`` as per the configured patterns).
  
  The extension provides ``cleverencode:`` and ``cleverdecode:`` filters
  like the deprecated win32text extension does. This means that you can
  disable win32text and enable eol and your filters will still work. You
  only need to these filters until you have prepared a ``.hgeol`` file.
  
  The ``win32text.forbid*`` hooks provided by the win32text extension
  have been unified into a single hook named ``eol.checkheadshook``. The
  hook will lookup the expected line endings from the ``.hgeol`` file,
  which means you must migrate to a ``.hgeol`` file first before using
  the hook. ``eol.checkheadshook`` only checks heads, intermediate
  invalid revisions will be pushed. To forbid them completely, use the
  ``eol.checkallhook`` hook. These hooks are best used as
  ``pretxnchangegroup`` hooks.
  
  See :hg:`help patterns` for more information about the glob patterns
  used.
  """
  
  
  
  import os
  import re
  from mercurial.i18n import _
  from mercurial import (
      config,
      error as errormod,
      extensions,
      match,
      pycompat,
      util,
  )
  
  # 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 = 'ships-with-hg-core'
  
  # Matches a lone LF, i.e., one that is not part of CRLF.
  singlelf = re.compile('(^|[^\r])\n')
  
  def inconsistenteol(data):
      return '\r\n' in data and singlelf.search(data)
  
  def tolf(s, params, ui, **kwargs):
      """Filter to convert to LF EOLs."""
      if util.binary(s):
          return s
      if ui.configbool('eol', 'only-consistent', True) and inconsistenteol(s):
          return s
      if (ui.configbool('eol', 'fix-trailing-newline', False)
          and s and s[-1] != '\n'):
          s = s + '\n'
      return util.tolf(s)
  
  def tocrlf(s, params, ui, **kwargs):
      """Filter to convert to CRLF EOLs."""
      if util.binary(s):
          return s
      if ui.configbool('eol', 'only-consistent', True) and inconsistenteol(s):
          return s
      if (ui.configbool('eol', 'fix-trailing-newline', False)
          and s and s[-1] != '\n'):
          s = s + '\n'
      return util.tocrlf(s)
  
  def isbinary(s, params):
      """Filter to do nothing with the file."""
      return s
  
  filters = {
      'to-lf': tolf,
      'to-crlf': tocrlf,
      'is-binary': isbinary,
      # The following provide backwards compatibility with win32text
      'cleverencode:': tolf,
      'cleverdecode:': tocrlf
  }
  
  class eolfile(object):
      def __init__(self, ui, root, data):
          self._decode = {'LF': 'to-lf', 'CRLF': 'to-crlf', 'BIN': 'is-binary'}
          self._encode = {'LF': 'to-lf', 'CRLF': 'to-crlf', 'BIN': 'is-binary'}
  
          self.cfg = config.config()
          # Our files should not be touched. The pattern must be
          # inserted first override a '** = native' pattern.
          self.cfg.set('patterns', '.hg*', 'BIN', 'eol')
          # We can then parse the user's patterns.
          self.cfg.parse('.hgeol', data)
  
          isrepolf = self.cfg.get('repository', 'native') != 'CRLF'
          self._encode['NATIVE'] = isrepolf and 'to-lf' or 'to-crlf'
          iswdlf = ui.config('eol', 'native', pycompat.oslinesep) in ('LF', '\n')
          self._decode['NATIVE'] = iswdlf and 'to-lf' or 'to-crlf'
  
          include = []
          exclude = []
          self.patterns = []
          for pattern, style in self.cfg.items('patterns'):
              key = style.upper()
              if key == 'BIN':
                  exclude.append(pattern)
              else:
                  include.append(pattern)
              m = match.match(root, '', [pattern])
              self.patterns.append((pattern, key, m))
          # This will match the files for which we need to care
          # about inconsistent newlines.
          self.match = match.match(root, '', [], include, exclude)
  
      def copytoui(self, ui):
          for pattern, key, m in self.patterns:
              try:
                  ui.setconfig('decode', pattern, self._decode[key], 'eol')
                  ui.setconfig('encode', pattern, self._encode[key], 'eol')
              except KeyError:
                  ui.warn(_("ignoring unknown EOL style '%s' from %s\n")
                          % (key, self.cfg.source('patterns', pattern)))
          # eol.only-consistent can be specified in ~/.hgrc or .hgeol
          for k, v in self.cfg.items('eol'):
              ui.setconfig('eol', k, v, 'eol')
  
      def checkrev(self, repo, ctx, files):
          failed = []
          for f in (files or ctx.files()):
              if f not in ctx:
                  continue
              for pattern, key, m in self.patterns:
                  if not m(f):
                      continue
                  target = self._encode[key]
                  data = ctx[f].data()
                  if (target == "to-lf" and "\r\n" in data
                      or target == "to-crlf" and singlelf.search(data)):
                      failed.append((f, target, str(ctx)))
                  break
          return failed
  
  def parseeol(ui, repo, nodes):
      try:
          for node in nodes:
              try:
                  if node is None:
                      # Cannot use workingctx.data() since it would load
                      # and cache the filters before we configure them.
                      data = repo.wvfs('.hgeol').read()
                  else:
                      data = repo[node]['.hgeol'].data()
                  return eolfile(ui, repo.root, data)
              except (IOError, LookupError):
                  pass
      except errormod.ParseError as inst:
          ui.warn(_("warning: ignoring .hgeol file due to parse error "
                    "at %s: %s\n") % (inst.args[1], inst.args[0]))
      return None
  
  def _checkhook(ui, repo, node, headsonly):
      # Get revisions to check and touched files at the same time
      files = set()
      revs = set()
      for rev in range(repo[node].rev(), len(repo)):
          revs.add(rev)
          if headsonly:
              ctx = repo[rev]
              files.update(ctx.files())
              for pctx in ctx.parents():
                  revs.discard(pctx.rev())
      failed = []
      for rev in revs:
          ctx = repo[rev]
          eol = parseeol(ui, repo, [ctx.node()])
          if eol:
              failed.extend(eol.checkrev(repo, ctx, files))
  
      if failed:
          eols = {'to-lf': 'CRLF', 'to-crlf': 'LF'}
          msgs = []
          for f, target, node in sorted(failed):
              msgs.append(_("  %s in %s should not have %s line endings") %
                          (f, node, eols[target]))
          raise errormod.Abort(_("end-of-line check failed:\n") + "\n".join(msgs))
  
  def checkallhook(ui, repo, node, hooktype, **kwargs):
      """verify that files have expected EOLs"""
      _checkhook(ui, repo, node, False)
  
  def checkheadshook(ui, repo, node, hooktype, **kwargs):
      """verify that files have expected EOLs"""
      _checkhook(ui, repo, node, True)
  
  # "checkheadshook" used to be called "hook"
  hook = checkheadshook
  
  def preupdate(ui, repo, hooktype, parent1, parent2):
      repo.loadeol([parent1])
      return False
  
  def uisetup(ui):
      ui.setconfig('hooks', 'preupdate.eol', preupdate, 'eol')
  
  def extsetup(ui):
      try:
          extensions.find('win32text')
          ui.warn(_("the eol extension is incompatible with the "
                    "win32text extension\n"))
      except KeyError:
          pass
  
  
  def reposetup(ui, repo):
      uisetup(repo.ui)
  
      if not repo.local():
          return
      for name, fn in filters.items():
          repo.adddatafilter(name, fn)
  
      ui.setconfig('patch', 'eol', 'auto', 'eol')
  
      class eolrepo(repo.__class__):
  
          def loadeol(self, nodes):
              eol = parseeol(self.ui, self, nodes)
              if eol is None:
                  return None
              eol.copytoui(self.ui)
              return eol.match
  
          def _hgcleardirstate(self):
              self._eolmatch = self.loadeol([None, 'tip'])
              if not self._eolmatch:
                  self._eolmatch = util.never
                  return
  
              oldeol = None
              try:
                  cachemtime = os.path.getmtime(self.vfs.join("eol.cache"))
              except OSError:
                  cachemtime = 0
              else:
                  olddata = self.vfs.read("eol.cache")
                  if olddata:
                      oldeol = eolfile(self.ui, self.root, olddata)
  
              try:
                  eolmtime = os.path.getmtime(self.wjoin(".hgeol"))
              except OSError:
                  eolmtime = 0
  
              if eolmtime > cachemtime:
                  self.ui.debug("eol: detected change in .hgeol\n")
  
                  hgeoldata = self.wvfs.read('.hgeol')
                  neweol = eolfile(self.ui, self.root, hgeoldata)
  
                  wlock = None
                  try:
                      wlock = self.wlock()
                      for f in self.dirstate:
                          if self.dirstate[f] != 'n':
                              continue
                          if oldeol is not None:
                              if not oldeol.match(f) and not neweol.match(f):
                                  continue
                              oldkey = None
                              for pattern, key, m in oldeol.patterns:
                                  if m(f):
                                      oldkey = key
                                      break
                              newkey = None
                              for pattern, key, m in neweol.patterns:
                                  if m(f):
                                      newkey = key
                                      break
                              if oldkey == newkey:
                                  continue
                          # all normal files need to be looked at again since
                          # the new .hgeol file specify a different filter
                          self.dirstate.normallookup(f)
                      # Write the cache to update mtime and cache .hgeol
                      with self.vfs("eol.cache", "w") as f:
                          f.write(hgeoldata)
                  except errormod.LockUnavailable:
                      # If we cannot lock the repository and clear the
                      # dirstate, then a commit might not see all files
                      # as modified. But if we cannot lock the
                      # repository, then we can also not make a commit,
                      # so ignore the error.
                      pass
                  finally:
                      if wlock is not None:
                          wlock.release()
  
          def commitctx(self, ctx, error=False):
              for f in sorted(ctx.added() + ctx.modified()):
                  if not self._eolmatch(f):
                      continue
                  fctx = ctx[f]
                  if fctx is None:
                      continue
                  data = fctx.data()
                  if util.binary(data):
                      # We should not abort here, since the user should
                      # be able to say "** = native" to automatically
                      # have all non-binary files taken care of.
                      continue
                  if inconsistenteol(data):
                      raise errormod.Abort(_("inconsistent newline style "
                                             "in %s\n") % f)
              return super(eolrepo, self).commitctx(ctx, error)
      repo.__class__ = eolrepo
      repo._hgcleardirstate()
  