/brz/remove-bazaar

# Copyright (C) 2009, 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

import errno

import os

import shutil

from . import (

    controldir,

    errors,

    ui,

    )

from .osutils import isdir

from .trace import note

from .workingtree import WorkingTree

from .i18n import gettext

def is_detritus(subp):

    """Return True if the supplied path is detritus, False otherwise"""

    return subp.endswith('.THIS') or subp.endswith('.BASE') or\

        subp.endswith('.OTHER') or subp.endswith('~') or subp.endswith('.tmp')

def iter_deletables(tree, unknown=False, ignored=False, detritus=False):

    """Iterate through files that may be deleted"""

    for subp in tree.extras():

        if detritus and is_detritus(subp):

            yield tree.abspath(subp), subp

            continue

        if tree.is_ignored(subp):

            if ignored:

                yield tree.abspath(subp), subp

        else:

            if unknown:

                yield tree.abspath(subp), subp

def clean_tree(directory, unknown=False, ignored=False, detritus=False,

               dry_run=False, no_prompt=False):

    """Remove files in the specified classes from the tree"""

    tree = WorkingTree.open_containing(directory)[0]

    with tree.lock_read():

        deletables = list(iter_deletables(tree, unknown=unknown,

                                          ignored=ignored, detritus=detritus))

        deletables = _filter_out_nested_controldirs(deletables)

        if len(deletables) == 0:

            note(gettext('Nothing to delete.'))

            return 0

        if not no_prompt:

            for path, subp in deletables:

                ui.ui_factory.note(subp)

            prompt = gettext('Are you sure you wish to delete these')

            if not ui.ui_factory.get_boolean(prompt):

                ui.ui_factory.note(gettext('Canceled'))

                return 0

        delete_items(deletables, dry_run=dry_run)

def _filter_out_nested_controldirs(deletables):

    result = []

    for path, subp in deletables:

        # bzr won't recurse into unknowns/ignored directories by default

        # so we don't pay a penalty for checking subdirs of path for nested

        # control dir.

        # That said we won't detect the branch in the subdir of non-branch

        # directory and therefore delete it. (worth to FIXME?)

        if isdir(path):

            try:

                controldir.ControlDir.open(path)

            except errors.NotBranchError:

                result.append((path, subp))

            else:

                # TODO may be we need to notify user about skipped directories?

                pass

        else:

            result.append((path, subp))

    return result

def delete_items(deletables, dry_run=False):

    """Delete files in the deletables iterable"""

    def onerror(function, path, excinfo):

        """Show warning for errors seen by rmtree.

        """

        # Handle only permission error while removing files.

        # Other errors are re-raised.

        if function is not os.remove or excinfo[1].errno != errno.EACCES:

            raise

        ui.ui_factory.show_warning(gettext('unable to remove %s') % path)

    has_deleted = False

    for path, subp in deletables:

        if not has_deleted:

            note(gettext("deleting paths:"))

            has_deleted = True

        if not dry_run:

            if isdir(path):

                shutil.rmtree(path, onerror=onerror)

            else:

                try:

                    os.unlink(path)

                    note('  ' + subp)

                except OSError as e:

                    # We handle only permission error here

                    if e.errno != errno.EACCES:

                        raise e

                    ui.ui_factory.show_warning(gettext(

                        'unable to remove "{0}": {1}.').format(

                        path, e.strerror))

        else:

            note('  ' + subp)

    if not has_deleted:

        note(gettext("No files deleted."))