~bzr-pqm/bzr/bzr.dev

# Copyright (C) 2005-2010 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

from bzrlib import (

    errors,

    osutils,

    )

from bzrlib.inventory import InventoryEntry

from bzrlib.trace import mutter, is_quiet

from bzrlib.symbol_versioning import deprecated_function

class TreeDelta(object):

    """Describes changes from one tree to another.

    Contains seven lists:

    added

        (path, id, kind)

    removed

        (path, id, kind)

    renamed

        (oldpath, newpath, id, kind, text_modified, meta_modified)

    kind_changed

        (path, id, old_kind, new_kind)

    modified

        (path, id, kind, text_modified, meta_modified)

    unchanged

        (path, id, kind)

    unversioned

        (path, None, kind)

    Each id is listed only once.

    Files that are both modified and renamed are listed only in

    renamed, with the text_modified flag true. The text_modified

    applies either to the content of the file or the target of the

    symbolic link, depending of the kind of file.

    Files are only considered renamed if their name has changed or

    their parent directory has changed.  Renaming a directory

    does not count as renaming all its contents.

    The lists are normally sorted when the delta is created.

    """

    def __init__(self):

        self.added = []

        self.removed = []

        self.renamed = []

        self.kind_changed = []

        self.modified = []

        self.unchanged = []

        self.unversioned = []

    def __eq__(self, other):

        if not isinstance(other, TreeDelta):

            return False

        return self.added == other.added \

               and self.removed == other.removed \

               and self.renamed == other.renamed \

               and self.modified == other.modified \

               and self.unchanged == other.unchanged \

               and self.kind_changed == other.kind_changed \

               and self.unversioned == other.unversioned

    def __ne__(self, other):

        return not (self == other)

    def __repr__(self):

        return "TreeDelta(added=%r, removed=%r, renamed=%r," \

            " kind_changed=%r, modified=%r, unchanged=%r," \

            " unversioned=%r)" % (self.added,

            self.removed, self.renamed, self.kind_changed, self.modified,

            self.unchanged, self.unversioned)

    def has_changed(self):

        return bool(self.modified

                    or self.added

                    or self.removed

                    or self.renamed

                    or self.kind_changed)

    def touches_file_id(self, file_id):

        """Return True if file_id is modified by this delta."""

        for l in self.added, self.removed, self.modified:

            for v in l:

                if v[1] == file_id:

                    return True

        for v in self.renamed:

            if v[2] == file_id:

                return True

        for v in self.kind_changed:

            if v[1] == file_id:

                return True

        return False

    def get_changes_as_text(self, show_ids=False, show_unchanged=False,

                            short_status=False):

        import StringIO

        output = StringIO.StringIO()

        report_delta(output, self, short_status, show_ids, show_unchanged)

        return output.getvalue()

def _compare_trees(old_tree, new_tree, want_unchanged, specific_files,

                   include_root, extra_trees=None,

                   require_versioned=False, want_unversioned=False):

    """Worker function that implements Tree.changes_from."""

    delta = TreeDelta()

    # mutter('start compare_trees')

    for (file_id, path, content_change, versioned, parent_id, name, kind,

         executable) in new_tree.iter_changes(old_tree, want_unchanged,

            specific_files, extra_trees=extra_trees,

            require_versioned=require_versioned,

            want_unversioned=want_unversioned):

        if versioned == (False, False):

            delta.unversioned.append((path[1], None, kind[1]))

            continue

        if not include_root and (None, None) == parent_id:

            continue

        fully_present = tuple((versioned[x] and kind[x] is not None) for

                              x in range(2))

        if fully_present[0] != fully_present[1]:

            if fully_present[1] is True:

                delta.added.append((path[1], file_id, kind[1]))

            else:

                delta.removed.append((path[0], file_id, kind[0]))

        elif fully_present[0] is False:

            continue

        elif name[0] != name[1] or parent_id[0] != parent_id[1]:

            # If the name changes, or the parent_id changes, we have a rename

            # (if we move a parent, that doesn't count as a rename for the

            # file)

            delta.renamed.append((path[0],

                                  path[1],

                                  file_id,

                                  kind[1],

                                  content_change,

                                  (executable[0] != executable[1])))

        elif kind[0] != kind[1]:

            delta.kind_changed.append((path[1], file_id, kind[0], kind[1]))

        elif content_change or executable[0] != executable[1]:

            delta.modified.append((path[1], file_id, kind[1],

                                   content_change,

                                   (executable[0] != executable[1])))

        else:

            delta.unchanged.append((path[1], file_id, kind[1]))

    delta.removed.sort()

    delta.added.sort()

    delta.renamed.sort()

    # TODO: jam 20060529 These lists shouldn't need to be sorted

    #       since we added them in alphabetical order.

    delta.modified.sort()

    delta.unchanged.sort()

    return delta

class _ChangeReporter(object):

    """Report changes between two trees"""

    def __init__(self, output=None, suppress_root_add=True,

                 output_file=None, unversioned_filter=None, view_info=None):

        """Constructor

        :param output: a function with the signature of trace.note, i.e.

            accepts a format and parameters.

        :param supress_root_add: If true, adding the root will be ignored

            (i.e. when a tree has just been initted)

        :param output_file: If supplied, a file-like object to write to.

            Only one of output and output_file may be supplied.

        :param unversioned_filter: A filter function to be called on

            unversioned files. This should return True to ignore a path.

            By default, no filtering takes place.

        :param view_info: A tuple of view_name,view_files if only

            items inside a view are to be reported on, or None for

            no view filtering.

        """

        if output_file is not None:

            if output is not None:

                raise BzrError('Cannot specify both output and output_file')

            def output(fmt, *args):

                output_file.write((fmt % args) + '\n')

        self.output = output

        if self.output is None:

            from bzrlib import trace

            self.output = trace.note

        self.suppress_root_add = suppress_root_add

        self.modified_map = {'kind changed': 'K',

                             'unchanged': ' ',

                             'created': 'N',

                             'modified': 'M',

                             'deleted': 'D'}

        self.versioned_map = {'added': '+', # versioned target

                              'unchanged': ' ', # versioned in both

                              'removed': '-', # versioned in source

                              'unversioned': '?', # versioned in neither

                              }

        self.unversioned_filter = unversioned_filter

        if view_info is None:

            self.view_name = None

            self.view_files = []

        else:

            self.view_name = view_info[0]

            self.view_files = view_info[1]

            self.output("Operating on whole tree but only reporting on "

                        "'%s' view." % (self.view_name,))

    def report(self, file_id, paths, versioned, renamed, modified, exe_change,

               kind):

        """Report one change to a file

        :param file_id: The file_id of the file

        :param path: The old and new paths as generated by Tree.iter_changes.

        :param versioned: may be 'added', 'removed', 'unchanged', or

            'unversioned.

        :param renamed: may be True or False

        :param modified: may be 'created', 'deleted', 'kind changed',

            'modified' or 'unchanged'.

        :param exe_change: True if the execute bit has changed

        :param kind: A pair of file kinds, as generated by Tree.iter_changes.

            None indicates no file present.

        """

        if is_quiet():

            return

        if paths[1] == '' and versioned == 'added' and self.suppress_root_add:

            return

        if self.view_files and not osutils.is_inside_any(self.view_files,

            paths[1]):

            return

        if versioned == 'unversioned':

            # skip ignored unversioned files if needed.

            if self.unversioned_filter is not None:

                if self.unversioned_filter(paths[1]):

                    return

            # dont show a content change in the output.

            modified = 'unchanged'

        # we show both paths in the following situations:

        # the file versioning is unchanged AND

        # ( the path is different OR

        #   the kind is different)

        if (versioned == 'unchanged' and

            (renamed or modified == 'kind changed')):

            if renamed:

                # on a rename, we show old and new

                old_path, path = paths

            else:

                # if it's not renamed, we're showing both for kind changes

                # so only show the new path

                old_path, path = paths[1], paths[1]

            # if the file is not missing in the source, we show its kind

            # when we show two paths.

            if kind[0] is not None:

                old_path += osutils.kind_marker(kind[0])

            old_path += " => "

        elif versioned == 'removed':

            # not present in target

            old_path = ""

            path = paths[0]

        else:

            old_path = ""

            path = paths[1]

        if renamed:

            rename = "R"

        else:

            rename = self.versioned_map[versioned]

        # we show the old kind on the new path when the content is deleted.

        if modified == 'deleted':

            path += osutils.kind_marker(kind[0])

        # otherwise we always show the current kind when there is one

        elif kind[1] is not None:

            path += osutils.kind_marker(kind[1])

        if exe_change:

            exe = '*'

        else:

            exe = ' '

        self.output("%s%s%s %s%s", rename, self.modified_map[modified], exe,

                    old_path, path)

def report_changes(change_iterator, reporter):

    """Report the changes from a change iterator.

    This is essentially a translation from low-level to medium-level changes.

    Further processing may be required to produce a human-readable output.

    Unfortunately, some tree-changing operations are very complex

    :change_iterator: an iterator or sequence of changes in the format

        generated by Tree.iter_changes

    :param reporter: The _ChangeReporter that will report the changes.

    """

    versioned_change_map = {

        (True, True)  : 'unchanged',

        (True, False) : 'removed',

        (False, True) : 'added',

        (False, False): 'unversioned',

        }

    for (file_id, path, content_change, versioned, parent_id, name, kind,

         executable) in change_iterator:

        exe_change = False

        # files are "renamed" if they are moved or if name changes, as long

        # as it had a value

        if None not in name and None not in parent_id and\

            (name[0] != name[1] or parent_id[0] != parent_id[1]):

            renamed = True

        else:

            renamed = False

        if kind[0] != kind[1]:

            if kind[0] is None:

                modified = "created"

            elif kind[1] is None:

                modified = "deleted"

            else:

                modified = "kind changed"

        else:

            if content_change:

                modified = "modified"

            else:

                modified = "unchanged"

            if kind[1] == "file":

                exe_change = (executable[0] != executable[1])

        versioned_change = versioned_change_map[versioned]

        reporter.report(file_id, path, versioned_change, renamed, modified,

                        exe_change, kind)

def report_delta(to_file, delta, short_status=False, show_ids=False, 

         show_unchanged=False, indent='', filter=None):

    """Output this delta in status-like form to to_file.

    :param to_file: A file-like object where the output is displayed.

    :param delta: A TreeDelta containing the changes to be displayed

    :param short_status: Single-line status if True.

    :param show_ids: Output the file ids if True.

    :param show_unchanged: Output the unchanged files if True.

    :param indent: Added at the beginning of all output lines (for merged

        revisions).

    :param filter: A callable receiving a path and a file id and

        returning True if the path should be displayed.

    """

    def decorate_path(path, kind, meta_modified=None):

        if kind == 'directory':

            path += '/'

        elif kind == 'symlink':

            path += '@'

        if meta_modified:

            path += '*'

        return path

    def show_more_renamed(item):

        (oldpath, file_id, kind,

         text_modified, meta_modified, newpath) = item

        dec_new_path = decorate_path(newpath, kind, meta_modified)

        to_file.write(' => %s' % dec_new_path)

        if text_modified or meta_modified:

            extra_modified.append((newpath, file_id, kind,

                                   text_modified, meta_modified))

    def show_more_kind_changed(item):

        (path, file_id, old_kind, new_kind) = item

        to_file.write(' (%s => %s)' % (old_kind, new_kind))

    def show_path(path, file_id, kind, meta_modified,

                  default_format, with_file_id_format):

        dec_path = decorate_path(path, kind, meta_modified)

        if show_ids:

            to_file.write(with_file_id_format % dec_path)

        else:

            to_file.write(default_format % dec_path)

    def show_list(files, long_status_name, short_status_letter,

                  default_format='%s', with_file_id_format='%-30s',

                  show_more=None):

        if files:

            header_shown = False

            if short_status:

                prefix = short_status_letter

            else:

                prefix = ''

            prefix = indent + prefix + '  '

            for item in files:

                path, file_id, kind = item[:3]

                if (filter is not None and not filter(path, file_id)):

                    continue

                if not header_shown and not short_status:

                    to_file.write(indent + long_status_name + ':\n')

                    header_shown = True

                meta_modified = None

                if len(item) == 5:

                    meta_modified = item[4]

                to_file.write(prefix)

                show_path(path, file_id, kind, meta_modified,

                          default_format, with_file_id_format)

                if show_more is not None:

                    show_more(item)

                if show_ids:

                    to_file.write(' %s' % file_id)

                to_file.write('\n')

    show_list(delta.removed, 'removed', 'D')

    show_list(delta.added, 'added', 'A')

    extra_modified = []

    # Reorder delta.renamed tuples so that all lists share the same

    # order for their 3 first fields and that they also begin like

    # the delta.modified tuples

    renamed = [(p, i, k, tm, mm, np)

               for  p, np, i, k, tm, mm  in delta.renamed]

    show_list(renamed, 'renamed', 'R', with_file_id_format='%s',

              show_more=show_more_renamed)

    show_list(delta.kind_changed, 'kind changed', 'K',

              with_file_id_format='%s',

              show_more=show_more_kind_changed)

    show_list(delta.modified + extra_modified, 'modified', 'M')

    if show_unchanged:

        show_list(delta.unchanged, 'unchanged', 'S')

    show_list(delta.unversioned, 'unknown', ' ')