#!/usr/bin/env python

#

# Copyright (C) 2006 - Marco Barisione <marco@barisione.org>

#

# This is a small extension for Mercurial (http://www.selenic.com/mercurial)

# that removes files not known to mercurial

#

# 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 mercurial import hg, util

import os

class Purge(object):

    '''removes files not tracked by mercurial

    Delete files not known to mercurial, this is useful to test local and

    uncommitted changes in the otherwise clean source tree.

    This means that purge will delete:

     - Unknown files: files marked with "?" by "hg status"

     - Ignored files: files usually ignored by Mercurial because they match a

       pattern in a ".hgignore" file

     - Empty directories: infact Mercurial ignores directories unless they

       contain files under source control managment

    But it will leave untouched:

     - Unmodified tracked files

     - Modified tracked files

     - New files added to the repository (with "hg add")

    If names are given, only files matching the names are considered, else

    all files in the repository directory are considered.

    Be careful with purge, you could irreversibly delete some files you

    forgot to add to the repository. If you only want to print the list of

    files that this program would delete use the -vn options.

    '''

    def __init__(self, act=True, abort_on_err=False):

        self._repo = None

        self._ui = None

        self._hg_root = None

        self._act = act

        self._abort_on_err = abort_on_err

    def purge(self, ui, repo, paths=None):

        self._repo = repo

        self._ui = ui

        self._hg_root = self._split_path(repo.root)

        if not paths:

            paths = [repo.root]

        for path in paths:

            path = os.path.abspath(path)

            for root, dirs, files in os.walk(path, topdown=False):

                if '.hg' in self._split_path(root):

                    # Skip files in the .hg directory.

                    # Note that if the repository is in a directory

                    # called .hg this command does not work.

                    continue

                for name in files:

                    self._remove_file(os.path.join(root, name))

                if not os.listdir(root):

                    # Remove this directory if it is empty.

                    self._remove_dir(root)

        self._repo = None

        self._ui = None

        self._hg_root = None

    def _error(self, msg):

        if self._abort_on_err:

            raise util.Abort(msg)

        else:

            ui.warn('warning: ' + msg + '\n')

    def _remove_file(self, name):

        relative_name = self._relative_name(name)

        # dirstate.state() requires a path relative to the root

        # directory.

        if self._repo.dirstate.state(relative_name) != '?':

            return

        if self._ui.verbose:

            self._ui.status(name + '\n')

        if self._act:

            try:

                os.remove(name)

            except OSError, e:

                error('"%s" cannot be removed' % name)

    def _remove_dir(self, name):

        if self._ui.verbose:

            self._ui.status(name + '\n')

        if self._act:

            try:

                os.rmdir(name)

            except OSError, e:

                error('"%s" cannot be removed' % name)

    def _relative_name(self, name):

        splitted_path = self._split_path(name)[len(self._hg_root):]

        return self._join_path(splitted_path)

    def _split_path(self, path):

        ret = []

        while True:

            head, tail = os.path.split(path)

            if tail:

                ret.append(tail)

            if head == path:

                ret.append(head)

                break

            path = head

        ret.reverse()

        return ret

    def _join_path(self, splitted_path):

        ret = ''

        for part in splitted_path:

            if ret:

                ret = os.path.join(ret, part)

            else:

                ret = part

        return ret

    def from_command(ui, repo, *paths, **opts):

        act = True

        if opts['nothing']:

            act = False

        abort_on_err = True

        if not opts['abort_on_err']:

            abort_on_err = False

        p = Purge(act, abort_on_err)

        p.purge(ui, repo, paths)

    # The docstring of from_command() is used by hg to print the help

    # of the command.

    from_command.__doc__ = __doc__

    from_command = staticmethod(from_command)

cmdtable = {

    'purge':    (Purge.from_command,

                 [('a', 'abort-on-err', None, 'abort if an error occurs'),

                  ('n', 'nothing',      None, 'do nothing on files, useful with --verbose'),

                 ],

                 'hg purge [OPTIONS] [NAME]')

}