~bzr-pqm/bzr/bzr.dev

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#! /usr/bin/env python
# -*- coding: UTF-8 -*-

# 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

from bzrlib.trace import mutter

class TreeDelta(object):
    """Describes changes from one tree to another.

    Contains four lists:

    added
        (path, id, kind)
    removed
        (path, id, kind)
    renamed
        (oldpath, newpath, id, kind, text_modified)
    modified
        (path, id, kind)
    unchanged
        (path, id, 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.

    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.modified = []
        self.unchanged = []

    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

    def __ne__(self, other):
        return not (self == other)

    def __repr__(self):
        return "TreeDelta(added=%r, removed=%r, renamed=%r, modified=%r," \
            " unchanged=%r)" % (self.added, self.removed, self.renamed,
            self.modified, self.unchanged)

    def has_changed(self):
        return bool(self.modified
                    or self.added
                    or self.removed
                    or self.renamed)

    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
        return False
            

    def show(self, to_file, show_ids=False, show_unchanged=False):
        def show_list(files):
            for path, fid, kind in files:
                if kind == 'directory':
                    path += '/'
                elif kind == 'symlink':
                    path += '@'
                    
                if show_ids:
                    print >>to_file, '  %-30s %s' % (path, fid)
                else:
                    print >>to_file, ' ', path
            
        if self.removed:
            print >>to_file, 'removed:'
            show_list(self.removed)
                
        if self.added:
            print >>to_file, 'added:'
            show_list(self.added)

        if self.renamed:
            print >>to_file, 'renamed:'
            for oldpath, newpath, fid, kind, text_modified in self.renamed:
                if show_ids:
                    print >>to_file, '  %s => %s %s' % (oldpath, newpath, fid)
                else:
                    print >>to_file, '  %s => %s' % (oldpath, newpath)
                    
        if self.modified:
            print >>to_file, 'modified:'
            show_list(self.modified)
            
        if show_unchanged and self.unchanged:
            print >>to_file, 'unchanged:'
            show_list(self.unchanged)



def compare_trees(old_tree, new_tree, want_unchanged=False, specific_files=None):
    """Describe changes from one tree to another.

    Returns a TreeDelta with details of added, modified, renamed, and
    deleted entries.

    The root entry is specifically exempt.

    This only considers versioned files.

    want_unchanged
        If true, also list files unchanged from one version to
        the next.

    specific_files
        If true, only check for changes to specified names or
        files within them.
    """

    from osutils import is_inside_any
    
    old_inv = old_tree.inventory
    new_inv = new_tree.inventory
    delta = TreeDelta()
    mutter('start compare_trees')

    # TODO: match for specific files can be rather smarter by finding
    # the IDs of those files up front and then considering only that.

    for file_id in old_tree:
        if file_id in new_tree:
            old_ie = old_inv[file_id]
            new_ie = new_inv[file_id]

            kind = old_ie.kind
            assert kind == new_ie.kind
            
            assert kind in ('file', 'directory', 'symlink', 'root_directory'), \
                   'invalid file kind %r' % kind

            if kind == 'root_directory':
                continue
            
            if specific_files:
                if (not is_inside_any(specific_files, old_inv.id2path(file_id)) 
                    and not is_inside_any(specific_files, new_inv.id2path(file_id))):
                    continue

            if kind == 'file':
                old_sha1 = old_tree.get_file_sha1(file_id)
                new_sha1 = new_tree.get_file_sha1(file_id)
                text_modified = (old_sha1 != new_sha1)
            else:
                ## mutter("no text to check for %r %r" % (file_id, kind))
                text_modified = False

            # TODO: Can possibly avoid calculating path strings if the
            # two files are unchanged and their names and parents are
            # the same and the parents are unchanged all the way up.
            # May not be worthwhile.
            
            if (old_ie.name != new_ie.name
                or old_ie.parent_id != new_ie.parent_id):
                delta.renamed.append((old_inv.id2path(file_id),
                                      new_inv.id2path(file_id),
                                      file_id, kind,
                                      text_modified))
            elif text_modified:
                delta.modified.append((new_inv.id2path(file_id), file_id, kind))
            elif want_unchanged:
                delta.unchanged.append((new_inv.id2path(file_id), file_id, kind))
        else:
            kind = old_inv.get_file_kind(file_id)
            if kind == 'root_directory':
                continue
            old_path = old_inv.id2path(file_id)
            if specific_files:
                if not is_inside_any(specific_files, old_path):
                    continue
            delta.removed.append((old_path, file_id, kind))

    mutter('start looking for new files')
    for file_id in new_inv:
        if file_id in old_inv:
            continue
        kind = new_inv.get_file_kind(file_id)
        if kind == 'root_directory':
            continue
        new_path = new_inv.id2path(file_id)
        if specific_files:
            if not is_inside_any(specific_files, new_path):
                continue
        delta.added.append((new_path, file_id, kind))
            
    delta.removed.sort()
    delta.added.sort()
    delta.renamed.sort()
    delta.modified.sort()
    delta.unchanged.sort()

    return delta