/brz/remove-bazaar

#!/usr/bin/env python

"""\

Read in a changeset output, and process it into a Changeset object.

"""

import bzrlib, bzrlib.changeset

import pprint

import common

class BadChangeset(Exception): pass

class MalformedHeader(BadChangeset): pass

class MalformedPatches(BadChangeset): pass

class MalformedFooter(BadChangeset): pass

def _unescape(name):

    """Now we want to find the filename effected.

    Unfortunately the filename is written out as

    repr(filename), which means that it surrounds

    the name with quotes which may be single or double

    (single is preferred unless there is a single quote in

    the filename). And some characters will be escaped.

    TODO:   There has to be some pythonic way of undo-ing the

            representation of a string rather than using eval.

    """

    delimiter = name[0]

    if name[-1] != delimiter:

        raise BadChangeset('Could not properly parse the'

                ' filename: %r' % name)

    # We need to handle escaped hexadecimals too.

    return name[1:-1].replace('\"', '"').replace("\'", "'")

class RevisionInfo(object):

    """Gets filled out for each revision object that is read.

    """

    def __init__(self, rev_id):

        self.rev_id = rev_id

        self.sha1 = None

        self.committer = None

        self.date = None

        self.timestamp = None

        self.timezone = None

        self.inventory_id = None

        self.inventory_sha1 = None

        self.parents = None

        self.message = None

    def __str__(self):

        return pprint.pformat(self.__dict__)

    def as_revision(self):

        from bzrlib.revision import Revision, RevisionReference

        rev = Revision(revision_id=self.rev_id,

            committer=self.committer,

            timestamp=float(self.timestamp),

            timezone=int(self.timezone),

            inventory_id=self.inventory_id,

            inventory_sha1=self.inventory_sha1,

            message='\n'.join(self.message))

        for parent in self.parents:

            rev_id, sha1 = parent.split('\t')

            rev.parents.append(RevisionReference(rev_id, sha1))

        return rev

class ChangesetInfo(object):

    """This contains the meta information. Stuff that allows you to

    recreate the revision or inventory XML.

    """

    def __init__(self):

        self.committer = None

        self.date = None

        self.message = None

        self.base = None

        self.base_sha1 = None

        # A list of RevisionInfo objects

        self.revisions = []

        self.text_ids = {} # file_id => text_id

        self.actions = []

        self.timestamp = None

        self.timezone = None

    def __str__(self):

        return pprint.pformat(self.__dict__)

    def complete_info(self):

        """This makes sure that all information is properly

        split up, based on the assumptions that can be made

        when information is missing.

        """

        if self.base is None:

            # When we don't have a base, then the real base

            # is the first parent of the last revision listed

            rev = self.revisions[-1]

            self.base = rev.parents[0].revision_id

            # In general, if self.base is None, self.base_sha1 should

            # also be None

            if self.base_sha1 is not None:

                assert self.base_sha1 == rev.parent[0].revision_sha1

            self.base_sha1 = rev.parents[0].revision_sha1

        if not self.timestamp and self.date:

            self.timestamp, self.timezone = common.unpack_highres_date(self.date)

        for rev in self.revisions:

            if rev.timestamp is None and self.timestamp is not None:

                rev.timestamp = self.timestamp

                rev.timezone = self.timezone

            if rev.message is None and self.message:

                rev.message = self.message

            if rev.committer is None and self.committer:

                rev.committer = self.committer

class ChangesetReader(object):

    """This class reads in a changeset from a file, and returns

    a Changeset object, which can then be applied against a tree.

    """

    def __init__(self, from_file):

        """Read in the changeset from the file.

        :param from_file: A file-like object (must have iterator support).

        """

        object.__init__(self)

        self.from_file = from_file

        self._next_line = None

        self.info = ChangesetInfo()

        # We put the actual inventory ids in the footer, so that the patch

        # is easier to read for humans.

        # Unfortunately, that means we need to read everything before we

        # can create a proper changeset.

        self._read_header()

        self._read_patches()

        self._read_footer()

    def get_info_and_tree(self, branch):

        """Return the meta information, and a Changeset tree which can

        be used to populate the local stores and working tree, respectively.

        """

        self.info.complete_info()

        store_base_sha1 = branch.get_revision_sha1(self.info.base) 

        if store_base_sha1 != self.info.base_sha1:

            raise BzrError('Base revision sha1 hash in store'

                    ' does not match the one read in the changeset'

                    ' (%s != %s)' % (store_base_sha1, self.info.base_sha1))

        tree = ChangesetTree(branch.revision_tree(self.info.base))

        self._update_tree(tree)

        return self.info, self.tree

    def _next(self):

        """yield the next line, but secretly

        keep 1 extra line for peeking.

        """

        for line in self.from_file:

            last = self._next_line

            self._next_line = line

            if last is not None:

                yield last

    def _read_header(self):

        """Read the bzr header"""

        header = common.get_header()

        found = False

        for line in self._next():

            if found:

                if (line[:2] != '# ' or line[-1:] != '\n'

                        or line[2:-1] != header[0]):

                    raise MalformedHeader('Found a header, but it'

                        ' was improperly formatted')

                header.pop(0) # We read this line.

                if not header:

                    break # We found everything.

            elif (line[:1] == '#' and line[-1:] == '\n'):

                line = line[1:-1].strip()

                if line[:len(common.header_str)] == common.header_str:

                    if line == header[0]:

                        found = True

                    else:

                        raise MalformedHeader('Found what looks like'

                                ' a header, but did not match')

                    header.pop(0)

        else:

            raise MalformedHeader('Did not find an opening header')

        for line in self._next():

            # The bzr header is terminated with a blank line

            # which does not start with '#'

            if line == '\n':

                break

            self._handle_next(line)

    def _read_next_entry(self, line, indent=1):

        """Read in a key-value pair

        """

        if line[:1] != '#':

            raise MalformedHeader('Bzr header did not start with #')

        line = line[1:-1] # Remove the '#' and '\n'

        if line[:indent] == ' '*indent:

            line = line[indent:]

        if not line:

            return None, None# Ignore blank lines

        loc = line.find(': ')

        if loc != -1:

            key = line[:loc]

            value = line[loc+2:]

            if not value:

                value = self._read_many(indent=indent+3)

        elif line[-1:] == ':':

            key = line[:-1]

            value = self._read_many(indent=indent+3)

        else:

            raise MalformedHeader('While looking for key: value pairs,'

                    ' did not find the colon %r' % (line))

        key = key.replace(' ', '_')

        return key, value

    def _handle_next(self, line):

        key, value = self._read_next_entry(line, indent=1)

        if key is None:

            return

        if key == 'revision':

            self._read_revision(value)

        elif hasattr(self.info, key):

            if getattr(self.info, key) is None:

                setattr(self.info, key, value)

            else:

                raise MalformedHeader('Duplicated Key: %s' % key)

        else:

            # What do we do with a key we don't recognize

            raise MalformedHeader('Unknown Key: %s' % key)

    def _read_many(self, indent):

        """If a line ends with no entry, that means that it should be

        followed with multiple lines of values.

        This detects the end of the list, because it will be a line that

        does not start properly indented.

        """

        values = []

        start = '#' + (' '*indent)

        if self._next_line[:len(start)] != start:

            return values

        for line in self._next():

            values.append(line[len(start):-1])

            if self._next_line[:len(start)] != start:

                break

        return values

    def _read_one_patch(self):

        """Read in one patch, return the complete patch, along with

        the next line.

        :return: action, lines, do_continue

        """

        # Peek and see if there are no patches

        if self._next_line[:1] == '#':

            return None, [], False

        line = self._next().next()

        if line[:3] != '***':

            raise MalformedPatches('The first line of all patches'

                ' should be a bzr meta line "***"')

        action = line[4:-1]

        lines = []

        for line in self._next():

            lines.append(line)

            if self._next_line[:3] == '***':

                return action, lines, True

            elif self._next_line[:1] == '#':

                return action, lines, False

        return action, lines, False

    def _read_patches(self):

        do_continue = True

        while do_continue:

            action, lines, do_continue = self._read_one_patch()

            if action is not None:

                self.info.actions.append((action, lines))

    def _read_revision(self, rev_id):

        """Revision entries have extra information associated.

        """

        rev_info = RevisionInfo(rev_id)

        start = '#    '

        for line in self._next():

            key,value = self._read_next_entry(line, indent=4)

            #if key is None:

            #    continue

            if hasattr(rev_info, key):

                if getattr(rev_info, key) is None:

                    setattr(rev_info, key, value)

                else:

                    raise MalformedHeader('Duplicated Key: %s' % key)

            else:

                # What do we do with a key we don't recognize

                raise MalformedHeader('Unknown Key: %s' % key)

            if self._next_line[:len(start)] != start:

                break

        self.info.revisions.append(rev_info)

    def _read_footer(self):

        """Read the rest of the meta information.

        :param first_line:  The previous step iterates past what it

                            can handle. That extra line is given here.

        """

        line = self._next().next()

        for line in self._next():

            self._handle_next(line)

            if self._next_line[:1] != '#':

                break

    def _update_tree(self, tree):

        """This fills out a ChangesetTree based on the information

        that was read in.

        :param tree: A ChangesetTree to update with the new information.

        """

        from bzrlib.errors import BzrError

        from common import decode

        def get_text_id(info, file_id):

            if info is not None:

                if info[:8] != 'text-id:':

                    raise BzrError("Text ids should be prefixed with 'text-id:'"

                        ': %r' % info)

                text_id = decode(info[8:])

            elif self.info.text_ids.has_key(file_id):

                return self.info.text_ids[file_id]

            else:

                # If text_id was not explicitly supplied

                # then it should be whatever we would guess it to be

                # based on the base revision, and what we know about

                # the target revision

                text_id = common.guess_text_id(tree.base_tree, 

                        file_id, self.info.base, True)

            if (self.info.text_ids.has_key(file_id)

                    and self.info.text_ids[file_id] != text_id):

                raise BzrError('Mismatched text_ids for file_id {%s}'

                        ': %s != %s' % (file_id,

                                        self.info.text_ids[file_id],

                                        text_id))

            # The Info object makes more sense for where

            # to store something like text_id, since it is

            # what will be used to generate stored inventory

            # entries.

            # The problem is that we are parsing the

            # ChangesetTree right now, we really modifying

            # the ChangesetInfo object

            self.info.text_ids[file_id] = text_id

            return text_id

        def renamed(kind, extra, lines):

            info = extra.split('\t')

            if len(info) < 2:

                raise BzrError('renamed action lines need both a from and to'

                        ': %r' % extra)

            old_path = decode(info[0])

            if info[1][:3] == '=> ':

                new_path = decode(info[1][3:])

            else:

                new_path = decode(info[1][3:])

            file_id = tree.path2id(new_path)

            if len(info) > 2:

                text_id = get_text_id(info[2], file_id)

            else:

                text_id = get_text_id(None, file_id)

            tree.note_rename(old_path, new_path)

            if lines:

                tree.note_patch(new_path, lines)

        def removed(kind, extra, lines):

            info = extra.split('\t')

            if len(info) > 1:

                # TODO: in the future we might allow file ids to be

                # given for removed entries

                raise BzrError('removed action lines should only have the path'

                        ': %r' % extra)

            path = decode(info[0])

            tree.note_deletion(path)

        def added(kind, extra, lines):

            info = extra.split('\t')

            if len(info) <= 1:

                raise BzrError('add action lines require the path and file id'

                        ': %r' % extra)

            elif len(info) > 3:

                raise BzrError('add action lines have fewer than 3 entries.'

                        ': %r' % extra)

            path = decode(info[0])

            if info[1][:8] == 'file-id:':

                raise BzrError('The file-id should follow the path for an add'

                        ': %r' % extra)

            file_id = decode(info[1][8:])

            if len(info) > 2:

                text_id = get_text_id(info[2], file_id)

            else:

                text_id = get_text_id(None, file_id)

            tree.note_id(file_id, path)

            tree.note_patch(path, lines)

        def modified(kind, extra, lines):

            info = extra.split('\t')

            if len(info) < 1:

                raise BzrError('modified action lines have at least'

                        'the path in them: %r' % extra)

            path = decode(info[0])

            file_id = tree.path2id(path)

            if len(info) > 1:

                text_id = get_text_id(info[1], file_id)

            else:

                text_id = get_text_id(None, file_id)

            tree.note_patch(path, lines)

        valid_actions = {

            'renamed':renamed,

            'removed':removed,

            'added':added,

            'modified':modified

        }

        for action_line, lines in self.info.actions:

            first = action_line.find(' ')

            if first == -1:

                raise BzrError('Bogus action line'

                        ' (no opening space): %r' % action_line)

            second = action_line.find(' ', first)

            if second == -1:

                raise BzrError('Bogus action line'

                        ' (missing second space): %r' % action_line)

            action = action_line[:first]

            kind = action_line[first+1:second]

            if kind not in ('file', 'directory'):

                raise BzrError('Bogus action line'

                        ' (invalid object kind): %r' % action_line)

            extra = action_line[second+1:]

            if action not in valid_actions:

                raise BzrError('Bogus action line'

                        ' (unrecognized action): %r' % action_line)

            valid_actions[action](kind, extra, lines)

def read_changeset(from_file):

    """Read in a changeset from a filelike object (must have "readline" support), and

    parse it into a Changeset object.

    """

    cr = ChangesetReader(from_file)

    info = cr.get_info()

    return info

class ChangesetTree:

    def __init__(self, base_tree=None):

        self.base_tree = base_tree

        self._renamed = {} # Mapping from old_path => new_path

        self._renamed_r = {} # new_path => old_path

        self._new_id = {} # new_path => new_id

        self._new_id_r = {} # new_id => new_path

        self.patches = {}

        self.deleted = []

        self.contents_by_id = True

    def __str__(self):

        return pprint.pformat(self.__dict__)

    def note_rename(self, old_path, new_path):

        """A file/directory has been renamed from old_path => new_path"""

        assert not self._renamed.has_key(old_path)

        assert not self._renamed_r.has_key(new_path)

        self._renamed[new_path] = old_path

        self._renamed_r[old_path] = new_path

    def note_id(self, new_id, new_path):

        """Files that don't exist in base need a new id."""

        self._new_id[new_path] = new_id

        self._new_id_r[new_id] = new_path

    def note_patch(self, new_path, patch):

        """There is a patch for a given filename."""

        self.patches[new_path] = patch

    def note_deletion(self, old_path):

        """The file at old_path has been deleted."""

        self.deleted.append(old_path)

    def old_path(self, new_path):

        """Get the old_path (path in the base_tree) for the file at new_path"""

        import os.path

        old_path = self._renamed.get(new_path)

        if old_path is not None:

            return old_path

        dirname,basename = os.path.split(new_path)

        if dirname is not '':

            old_dir = self.old_path(dirname)

            if old_dir is None:

                old_path = None

            else:

                old_path = os.path.join(old_dir, basename)

        else:

            old_path = new_path

        #If the new path wasn't in renamed, the old one shouldn't be in

        #renamed_r

        if self._renamed_r.has_key(old_path):

            return None

        return old_path 

    def new_path(self, old_path):

        """Get the new_path (path in the target_tree) for the file at old_path

        in the base tree.

        """

        import os.path

        new_path = self._renamed_r.get(old_path)

        if new_path is not None:

            return new_path

        if self._renamed.has_key(new_path):

            return None

        dirname,basename = os.path.split(old_path)

        if dirname is not '':

            new_dir = self.new_path(dirname)

            if new_dir is None:

                new_path = None

            else:

                new_path = os.path.join(new_dir, basename)

        else:

            new_path = old_path

        #If the old path wasn't in renamed, the new one shouldn't be in

        #renamed_r

        if self._renamed.has_key(new_path):

            return None

        return new_path 

    def path2id(self, path):

        """Return the id of the file present at path in the target tree."""

        file_id = self._new_id.get(path)

        if file_id is not None:

            return file_id

        old_path = self.old_path(path)

        if old_path is None:

            return None

        if old_path in self.deleted:

            return None

        return self.base_tree.path2id(old_path)

    def id2path(self, file_id):

        """Return the new path in the target tree of the file with id file_id"""

        path = self._new_id_r.get(file_id)

        if path is not None:

            return path

        old_path = self.base_tree.id2path(file_id)

        if old_path is None:

            return None

        if old_path in self.deleted:

            return None

        return self.new_path(old_path)

    def old_contents_id(self, file_id):

        """Return the id in the base_tree for the given file_id,

        or None if the file did not exist in base.

        FIXME:  Something doesn't seem right here. It seems like this function

                should always either return None or file_id. Even if

                you are doing the by-path lookup, you are doing a

                id2path lookup, just to do the reverse path2id lookup.

        """

        if self.contents_by_id:

            if self.base_tree.has_id(file_id):

                return file_id

            else:

                return None

        new_path = self.id2path(file_id)

        return self.base_tree.path2id(new_path)

    def get_file(self, file_id):

        """Return a file-like object containing the new contents of the

        file given by file_id.

        TODO:   It might be nice if this actually generated an entry

                in the text-store, so that the file contents would

                then be cached.

        """

        base_id = self.old_contents_id(file_id)

        if base_id is not None:

            patch_original = self.base_tree.get_file(base_id)

        else:

            patch_original = None

        file_patch = self.patches.get(self.id2path(file_id))

        if file_patch is None:

            return patch_original

        return patched_file(file_patch, patch_original)

    def __iter__(self):

        for file_id in self._new_id_r.iterkeys():

            yield file_id

        for file_id in self.base_tree:

            if self.id2path(file_id) is None:

                continue

            yield file_id

def patched_file(file_patch, original):

    from bzrlib.patch import patch

    from tempfile import mkdtemp

    from shutil import rmtree

    from StringIO import StringIO

    from bzrlib.osutils import pumpfile

    import os.path

    temp_dir = mkdtemp()

    try:

        original_path = os.path.join(temp_dir, "originalfile")

        temp_original = file(original_path, "wb")

        if original is not None:

            pumpfile(original, temp_original)

        temp_original.close()

        patched_path = os.path.join(temp_dir, "patchfile")

        assert patch(file_patch, original_path, patched_path) == 0

        result = StringIO()

        temp_patched = file(patched_path, "rb")

        pumpfile(temp_patched, result)

        temp_patched.close()

        result.seek(0,0)

    finally:

        rmtree(temp_dir)

    return result

def test():

    import unittest

    from StringIO import StringIO

    from bzrlib.diff import internal_diff

    class MockTree(object):

        def __init__(self):

            object.__init__(self)

            self.paths = {}

            self.ids = {}

            self.contents = {}

        def __iter__(self):

            return self.paths.iterkeys()

        def add_dir(self, file_id, path):

            self.paths[file_id] = path

            self.ids[path] = file_id

        def add_file(self, file_id, path, contents):

            self.add_dir(file_id, path)

            self.contents[file_id] = contents