/brz/remove-bazaar

# Copyright (C) 2005 Canonical Ltd

# This program is free software; you can redistribute it and/or modify

# it under the terms of the GNU General Public License as published by

# the Free Software Foundation; either version 2 of the License, or

# (at your option) any later version.

# This program is distributed in the hope that it will be useful,

# but WITHOUT ANY WARRANTY; without even the implied warranty of

# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

# GNU General Public License for more details.

# You should have received a copy of the GNU General Public License

# along with this program; if not, write to the Free Software

# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

"""Tree classes, representing directory at point in time.

"""

import os

from cStringIO import StringIO

from warnings import warn

import bzrlib

from bzrlib.errors import BzrError, BzrCheckError

from bzrlib import errors

from bzrlib.inventory import Inventory

from bzrlib.osutils import fingerprint_file

import bzrlib.revision

from bzrlib.trace import mutter, note

class Tree(object):

    """Abstract file tree.

    There are several subclasses:

    * `WorkingTree` exists as files on disk editable by the user.

    * `RevisionTree` is a tree as recorded at some point in the past.

    Trees contain an `Inventory` object, and also know how to retrieve

    file texts mentioned in the inventory, either from a working

    directory or from a store.

    It is possible for trees to contain files that are not described

    in their inventory or vice versa; for this use `filenames()`.

    Trees can be compared, etc, regardless of whether they are working

    trees or versioned trees.

    """

    def conflicts(self):

        """Get a list of the conflicts in the tree.

        Each conflict is an instance of bzrlib.conflicts.Conflict.

        """

        return []

    def get_parent_ids(self):

        """Get the parent ids for this tree. 

        :return: a list of parent ids. [] is returned to indicate

        a tree with no parents.

        :raises: BzrError if the parents are not known.

        """

        raise NotImplementedError(self.get_parent_ids)

    def has_filename(self, filename):

        """True if the tree has given filename."""

        raise NotImplementedError()

    def has_id(self, file_id):

        return self.inventory.has_id(file_id)

    __contains__ = has_id

    def has_or_had_id(self, file_id):

        if file_id == self.inventory.root.file_id:

            return True

        return self.inventory.has_id(file_id)

    def __iter__(self):

        return iter(self.inventory)

    def id2path(self, file_id):

        return self.inventory.id2path(file_id)

    def iter_entries_by_dir(self):

        """Walk the tree in 'by_dir' order.

        This will yield each entry in the tree as a (path, entry) tuple. The

        order that they are yielded is: the contents of a directory are 

        preceeded by the parent of a directory, and all the contents of a 

        directory are grouped together.

        """

        return self.inventory.iter_entries_by_dir()

    def kind(self, file_id):

        raise NotImplementedError("subclasses must implement kind")

    def _get_inventory(self):

        return self._inventory

    def get_file_by_path(self, path):

        return self.get_file(self._inventory.path2id(path))

    inventory = property(_get_inventory,

                         doc="Inventory of this Tree")

    def _check_retrieved(self, ie, f):

        if not __debug__:

            return  

        fp = fingerprint_file(f)

        f.seek(0)

        if ie.text_size != None:

            if ie.text_size != fp['size']:

                raise BzrError("mismatched size for file %r in %r" % (ie.file_id, self._store),

                        ["inventory expects %d bytes" % ie.text_size,

                         "file is actually %d bytes" % fp['size'],

                         "store is probably damaged/corrupt"])

        if ie.text_sha1 != fp['sha1']:

            raise BzrError("wrong SHA-1 for file %r in %r" % (ie.file_id, self._store),

                    ["inventory expects %s" % ie.text_sha1,

                     "file is actually %s" % fp['sha1'],

                     "store is probably damaged/corrupt"])

    def print_file(self, file_id):

        """Print file with id `file_id` to stdout."""

        import sys

        sys.stdout.write(self.get_file_text(file_id))

    def lock_read(self):

        pass

    def unknowns(self):

        """What files are present in this tree and unknown.

        :return: an iterator over the unknown files.

        """

        return iter([])

    def unlock(self):

        pass

    def filter_unversioned_files(self, paths):

        """Filter out paths that are not versioned.

        :return: set of paths.

        """

        # NB: we specifically *don't* call self.has_filename, because for

        # WorkingTrees that can indicate files that exist on disk but that 

        # are not versioned.

        pred = self.inventory.has_filename

        return set((p for p in paths if not pred(p)))

class RevisionTree(Tree):

    """Tree viewing a previous revision.

    File text can be retrieved from the text store.

    TODO: Some kind of `__repr__` method, but a good one

           probably means knowing the branch and revision number,

           or at least passing a description to the constructor.

    """

    def __init__(self, branch, inv, revision_id):

        # for compatability the 'branch' parameter has not been renamed to 

        # repository at this point. However, we should change RevisionTree's

        # construction to always be via Repository and not via direct 

        # construction - this will mean that we can change the constructor

        # with much less chance of breaking client code.

        self._repository = branch

        self._weave_store = branch.weave_store

        self._inventory = inv

        self._revision_id = revision_id

    def get_parent_ids(self):

        """See Tree.get_parent_ids.

        A RevisionTree's parents match the revision graph.

        """

        parent_ids = self._repository.get_revision(self._revision_id).parent_ids

        return parent_ids

    def get_revision_id(self):

        """Return the revision id associated with this tree."""

        return self._revision_id

    def get_weave(self, file_id):

        return self._weave_store.get_weave(file_id,

                self._repository.get_transaction())

    def get_file_lines(self, file_id):

        ie = self._inventory[file_id]

        weave = self.get_weave(file_id)

        return weave.get_lines(ie.revision)

    def get_file_text(self, file_id):

        return ''.join(self.get_file_lines(file_id))

    def get_file(self, file_id):

        return StringIO(self.get_file_text(file_id))

    def get_file_size(self, file_id):

        return self._inventory[file_id].text_size

    def get_file_sha1(self, file_id, path=None):

        ie = self._inventory[file_id]

        if ie.kind == "file":

            return ie.text_sha1

        return None

    def get_file_mtime(self, file_id, path=None):

        ie = self._inventory[file_id]

        revision = self._repository.get_revision(ie.revision)

        return revision.timestamp

    def is_executable(self, file_id, path=None):

        ie = self._inventory[file_id]

        if ie.kind != "file":

            return None 

        return self._inventory[file_id].executable

    def has_filename(self, filename):

        return bool(self.inventory.path2id(filename))

    def list_files(self):

        # The only files returned by this are those from the version

        entries = self.inventory.iter_entries()

        # skip the root for compatability with the current apis.

        entries.next()

        for path, entry in entries:

            yield path, 'V', entry.kind, entry.file_id, entry

    def get_symlink_target(self, file_id):

        ie = self._inventory[file_id]

        return ie.symlink_target;

    def kind(self, file_id):

        return self._inventory[file_id].kind

    def lock_read(self):

        self._repository.lock_read()

    def unlock(self):

        self._repository.unlock()

class EmptyTree(Tree):

    def __init__(self):

        self._inventory = Inventory()

        warn('EmptyTree is deprecated as of bzr 0.9 please use '

            'repository.revision_tree instead.',

            DeprecationWarning, stacklevel=2)

    def get_parent_ids(self):

        return []

    def get_symlink_target(self, file_id):

        return None

    def has_filename(self, filename):

        return False

    def kind(self, file_id):

        assert self._inventory[file_id].kind == "root_directory"

        return "root_directory"

    def list_files(self):

        return iter([])

    def __contains__(self, file_id):

        return file_id in self._inventory

    def get_file_sha1(self, file_id, path=None):

        assert self._inventory[file_id].kind == "root_directory"

        return None

######################################################################

# diff

# TODO: Merge these two functions into a single one that can operate

# on either a whole tree or a set of files.

# TODO: Return the diff in order by filename, not by category or in

# random order.  Can probably be done by lock-stepping through the

# filenames from both trees.

def file_status(filename, old_tree, new_tree):

    """Return single-letter status, old and new names for a file.

    The complexity here is in deciding how to represent renames;

    many complex cases are possible.

    """

    old_inv = old_tree.inventory

    new_inv = new_tree.inventory

    new_id = new_inv.path2id(filename)

    old_id = old_inv.path2id(filename)

    if not new_id and not old_id:

        # easy: doesn't exist in either; not versioned at all

        if new_tree.is_ignored(filename):

            return 'I', None, None

        else:

            return '?', None, None

    elif new_id:

        # There is now a file of this name, great.

        pass

    else:

        # There is no longer a file of this name, but we can describe

        # what happened to the file that used to have

        # this name.  There are two possibilities: either it was

        # deleted entirely, or renamed.

        assert old_id

        if new_inv.has_id(old_id):

            return 'X', old_inv.id2path(old_id), new_inv.id2path(old_id)

        else:

            return 'D', old_inv.id2path(old_id), None

    # if the file_id is new in this revision, it is added

    if new_id and not old_inv.has_id(new_id):

        return 'A'

    # if there used to be a file of this name, but that ID has now

    # disappeared, it is deleted

    if old_id and not new_inv.has_id(old_id):

        return 'D'

    return 'wtf?'

def find_renames(old_inv, new_inv):

    for file_id in old_inv:

        if file_id not in new_inv:

            continue

        old_name = old_inv.id2path(file_id)

        new_name = new_inv.id2path(file_id)

        if old_name != new_name:

            yield (old_name, new_name)

def find_ids_across_trees(filenames, trees, require_versioned=True):

    """Find the ids corresponding to specified filenames.

    All matches in all trees will be used, and all children of matched

    directories will be used.

    :param filenames: The filenames to find file_ids for

    :param trees: The trees to find file_ids within

    :param require_versioned: if true, all specified filenames must occur in

    at least one tree.

    :return: a set of file ids for the specified filenames and their children.

    """

    if not filenames:

        return None

    specified_ids = _find_filename_ids_across_trees(filenames, trees, 

                                                    require_versioned)

    return _find_children_across_trees(specified_ids, trees)

def _find_filename_ids_across_trees(filenames, trees, require_versioned):

    """Find the ids corresponding to specified filenames.

    All matches in all trees will be used.

    :param filenames: The filenames to find file_ids for

    :param trees: The trees to find file_ids within

    :param require_versioned: if true, all specified filenames must occur in

    at least one tree.

    :return: a set of file ids for the specified filenames

    """

    not_versioned = []

    interesting_ids = set()

    for tree_path in filenames:

        not_found = True

        for tree in trees:

            file_id = tree.inventory.path2id(tree_path)

            if file_id is not None:

                interesting_ids.add(file_id)

                not_found = False

        if not_found:

            not_versioned.append(tree_path)

    if len(not_versioned) > 0 and require_versioned:

        raise errors.PathsNotVersionedError(not_versioned)

    return interesting_ids

def _find_children_across_trees(specified_ids, trees):

    """Return a set including specified ids and their children

    All matches in all trees will be used.

    :param trees: The trees to find file_ids within

    :return: a set containing all specified ids and their children 

    """

    interesting_ids = set(specified_ids)

    pending = interesting_ids

    # now handle children of interesting ids

    # we loop so that we handle all children of each id in both trees

    while len(pending) > 0:

        new_pending = set()

        for file_id in pending:

            for tree in trees:

                if file_id not in tree:

                    continue

                entry = tree.inventory[file_id]

                for child in getattr(entry, 'children', {}).itervalues():

                    if child.file_id not in interesting_ids:

                        new_pending.add(child.file_id)

        interesting_ids.update(new_pending)

        pending = new_pending

    return interesting_ids