~bzr-pqm/bzr/bzr.dev

# Copyright (C) 2008, 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

from cStringIO import StringIO

import shutil

import sys

import tempfile

from bzrlib import (

    builtins,

    delta,

    diff,

    errors,

    osutils,

    patches,

    patiencediff,

    shelf,

    textfile,

    trace,

    ui,

    workingtree,

)

class UseEditor(Exception):

    """Use an editor instead of selecting hunks."""

class ShelfReporter(object):

    vocab = {'add file': 'Shelve adding file "%(path)s"?',

             'binary': 'Shelve binary changes?',

             'change kind': 'Shelve changing "%s" from %(other)s'

             ' to %(this)s?',

             'delete file': 'Shelve removing file "%(path)s"?',

             'final': 'Shelve %d change(s)?',

             'hunk': 'Shelve?',

             'modify target': 'Shelve changing target of'

             ' "%(path)s" from "%(other)s" to "%(this)s"?',

             'rename': 'Shelve renaming "%(other)s" =>'

                        ' "%(this)s"?'

             }

    invert_diff = False

    def __init__(self):

        self.delta_reporter = delta._ChangeReporter()

    def no_changes(self):

        """Report that no changes were selected to apply."""

        trace.warning('No changes to shelve.')

    def shelved_id(self, shelf_id):

        """Report the id changes were shelved to."""

        trace.note('Changes shelved with id "%d".' % shelf_id)

    def changes_destroyed(self):

        """Report that changes were made without shelving."""

        trace.note('Selected changes destroyed.')

    def selected_changes(self, transform):

        """Report the changes that were selected."""

        trace.note("Selected changes:")

        changes = transform.iter_changes()

        delta.report_changes(changes, self.delta_reporter)

    def prompt_change(self, change):

        """Determine the prompt for a change to apply."""

        if change[0] == 'rename':

            vals = {'this': change[3], 'other': change[2]}

        elif change[0] == 'change kind':

            vals = {'path': change[4], 'other': change[2], 'this': change[3]}

        elif change[0] == 'modify target':

            vals = {'path': change[2], 'other': change[3], 'this': change[4]}

        else:

            vals = {'path': change[3]}

        prompt = self.vocab[change[0]] % vals

        return prompt

class ApplyReporter(ShelfReporter):

    vocab = {'add file': 'Delete file "%(path)s"?',

             'binary': 'Apply binary changes?',

             'change kind': 'Change "%(path)s" from %(this)s'

             ' to %(other)s?',

             'delete file': 'Add file "%(path)s"?',

             'final': 'Apply %d change(s)?',

             'hunk': 'Apply change?',

             'modify target': 'Change target of'

             ' "%(path)s" from "%(this)s" to "%(other)s"?',

             'rename': 'Rename "%(this)s" => "%(other)s"?',

             }

    invert_diff = True

    def changes_destroyed(self):

        pass

class Shelver(object):

    """Interactively shelve the changes in a working tree."""

    def __init__(self, work_tree, target_tree, diff_writer=None, auto=False,

                 auto_apply=False, file_list=None, message=None,

                 destroy=False, manager=None, reporter=None):

        """Constructor.

        :param work_tree: The working tree to shelve changes from.

        :param target_tree: The "unchanged" / old tree to compare the

            work_tree to.

        :param auto: If True, shelve each possible change.

        :param auto_apply: If True, shelve changes with no final prompt.

        :param file_list: If supplied, only files in this list may be shelved.

        :param message: The message to associate with the shelved changes.

        :param destroy: Change the working tree without storing the shelved

            changes.

        :param manager: The shelf manager to use.

        :param reporter: Object for reporting changes to user.

        """

        self.work_tree = work_tree

        self.target_tree = target_tree

        self.diff_writer = diff_writer

        if self.diff_writer is None:

            self.diff_writer = sys.stdout

        if manager is None:

            manager = work_tree.get_shelf_manager()

        self.manager = manager

        self.auto = auto

        self.auto_apply = auto_apply

        self.file_list = file_list

        self.message = message

        self.destroy = destroy

        if reporter is None:

            reporter = ShelfReporter()

        self.reporter = reporter

        config = self.work_tree.branch.get_config()

        self.change_editor = config.get_change_editor(target_tree, work_tree)

        self.work_tree.lock_tree_write()

    @classmethod

    def from_args(klass, diff_writer, revision=None, all=False, file_list=None,

                  message=None, directory='.', destroy=False):

        """Create a shelver from commandline arguments.

        The returned shelver wil have a work_tree that is locked and should

        be unlocked.

        :param revision: RevisionSpec of the revision to compare to.

        :param all: If True, shelve all changes without prompting.

        :param file_list: If supplied, only files in this list may be  shelved.

        :param message: The message to associate with the shelved changes.

        :param directory: The directory containing the working tree.

        :param destroy: Change the working tree without storing the shelved

            changes.

        """

        tree, path = workingtree.WorkingTree.open_containing(directory)

        # Ensure that tree is locked for the lifetime of target_tree, as

        # target tree may be reading from the same dirstate.

        tree.lock_tree_write()

        try:

            target_tree = builtins._get_one_revision_tree('shelf2', revision,

                tree.branch, tree)

            files = builtins.safe_relpath_files(tree, file_list)

            return klass(tree, target_tree, diff_writer, all, all, files,

                         message, destroy)

        finally:

            tree.unlock()

    def run(self):

        """Interactively shelve the changes."""

        creator = shelf.ShelfCreator(self.work_tree, self.target_tree,

                                     self.file_list)

        self.tempdir = tempfile.mkdtemp()

        changes_shelved = 0

        try:

            for change in creator.iter_shelvable():

                if change[0] == 'modify text':

                    try:

                        changes_shelved += self.handle_modify_text(creator,

                                                                   change[1])

                    except errors.BinaryFile:

                        if self.prompt_bool(self.reporter.vocab['binary']):

                            changes_shelved += 1

                            creator.shelve_content_change(change[1])

                else:

                    if self.prompt_bool(self.reporter.prompt_change(change)):

                        creator.shelve_change(change)

                        changes_shelved += 1

            if changes_shelved > 0:

                self.reporter.selected_changes(creator.work_transform)

                if (self.auto_apply or self.prompt_bool(

                    self.reporter.vocab['final'] % changes_shelved)):

                    if self.destroy:

                        creator.transform()

                        self.reporter.changes_destroyed()

                    else:

                        shelf_id = self.manager.shelve_changes(creator,

                                                               self.message)

                        self.reporter.shelved_id(shelf_id)

            else:

                self.reporter.no_changes()

        finally:

            shutil.rmtree(self.tempdir)

            creator.finalize()

    def finalize(self):

        if self.change_editor is not None:

            self.change_editor.finish()

        self.work_tree.unlock()

    def get_parsed_patch(self, file_id, invert=False):

        """Return a parsed version of a file's patch.

        :param file_id: The id of the file to generate a patch for.

        :param invert: If True, provide an inverted patch (insertions displayed

            as removals, removals displayed as insertions).

        :return: A patches.Patch.

        """

        diff_file = StringIO()

        if invert:

            old_tree = self.work_tree

            new_tree = self.target_tree

        else:

            old_tree = self.target_tree

            new_tree = self.work_tree

        old_path = old_tree.id2path(file_id)

        new_path = new_tree.id2path(file_id)

        text_differ = diff.DiffText(old_tree, new_tree, diff_file)

        patch = text_differ.diff(file_id, old_path, new_path, 'file', 'file')

        diff_file.seek(0)

        return patches.parse_patch(diff_file)

    def prompt(self, message):

        """Prompt the user for a character.

        :param message: The message to prompt a user with.

        :return: A character.

        """

        if not sys.stdin.isatty():

            # Since there is no controlling terminal we will hang when trying

            # to prompt the user, better abort now.  See

            # https://code.launchpad.net/~bialix/bzr/shelve-no-tty/+merge/14905

            # for more context.

            raise errors.BzrError("You need a controlling terminal.")

        sys.stdout.write(message)

        char = osutils.getchar()

        sys.stdout.write("\r" + ' ' * len(message) + '\r')

        sys.stdout.flush()

        return char

    def prompt_bool(self, question, long=False, allow_editor=False):

        """Prompt the user with a yes/no question.

        This may be overridden by self.auto.  It may also *set* self.auto.  It

        may also raise UserAbort.

        :param question: The question to ask the user.

        :return: True or False

        """

        if self.auto:

            return True

        editor_string = ''

        if long:

            if allow_editor:

                editor_string = '(E)dit manually, '

            prompt = ' [(y)es, (N)o, %s(f)inish, or (q)uit]' % editor_string

        else:

            if allow_editor:

                editor_string = 'e'

            prompt = ' [yN%sfq?]' % editor_string

        char = self.prompt(question + prompt)

        if char == 'y':

            return True

        elif char == 'e' and allow_editor:

            raise UseEditor

        elif char == 'f':

            self.auto = True

            return True

        elif char == '?':

            return self.prompt_bool(question, long=True)

        if char == 'q':

            raise errors.UserAbort()

        else:

            return False

    def handle_modify_text(self, creator, file_id):

        """Handle modified text, by using hunk selection or file editing.

        :param creator: A ShelfCreator.

        :param file_id: The id of the file that was modified.

        :return: The number of changes.

        """

        work_tree_lines = self.work_tree.get_file_lines(file_id)

        try:

            lines, change_count = self._select_hunks(creator, file_id,

                                                     work_tree_lines)

        except UseEditor:

            lines, change_count = self._edit_file(file_id, work_tree_lines)

        if change_count != 0:

            creator.shelve_lines(file_id, lines)

        return change_count

    def _select_hunks(self, creator, file_id, work_tree_lines):

        """Provide diff hunk selection for modified text.

        If self.reporter.invert_diff is True, the diff is inverted so that

        insertions are displayed as removals and vice versa.

        :param creator: a ShelfCreator

        :param file_id: The id of the file to shelve.

        :param work_tree_lines: Line contents of the file in the working tree.

        :return: number of shelved hunks.

        """

        if self.reporter.invert_diff:

            target_lines = work_tree_lines

        else:

            target_lines = self.target_tree.get_file_lines(file_id)

        textfile.check_text_lines(work_tree_lines)

        textfile.check_text_lines(target_lines)

        parsed = self.get_parsed_patch(file_id, self.reporter.invert_diff)

        final_hunks = []

        if not self.auto:

            offset = 0

            self.diff_writer.write(parsed.get_header())

            for hunk in parsed.hunks:

                self.diff_writer.write(str(hunk))

                selected = self.prompt_bool(self.reporter.vocab['hunk'],

                                            allow_editor=(self.change_editor

                                                          is not None))

                if not self.reporter.invert_diff:

                    selected = (not selected)

                if selected:

                    hunk.mod_pos += offset

                    final_hunks.append(hunk)

                else:

                    offset -= (hunk.mod_range - hunk.orig_range)

        sys.stdout.flush()

        if self.reporter.invert_diff:

            change_count = len(final_hunks)

        else:

            change_count = len(parsed.hunks) - len(final_hunks)

        patched = patches.iter_patched_from_hunks(target_lines,

                                                  final_hunks)

        lines = list(patched)

        return lines, change_count

    def _edit_file(self, file_id, work_tree_lines):

        """

        :param file_id: id of the file to edit.

        :param work_tree_lines: Line contents of the file in the working tree.

        :return: (lines, change_region_count), where lines is the new line

            content of the file, and change_region_count is the number of

            changed regions.

        """

        lines = osutils.split_lines(self.change_editor.edit_file(file_id))

        return lines, self._count_changed_regions(work_tree_lines, lines)

    @staticmethod

    def _count_changed_regions(old_lines, new_lines):

        matcher = patiencediff.PatienceSequenceMatcher(None, old_lines,

                                                       new_lines)

        blocks = matcher.get_matching_blocks()

        return len(blocks) - 2

class Unshelver(object):

    """Unshelve changes into a working tree."""

    @classmethod

    def from_args(klass, shelf_id=None, action='apply', directory='.',

                  write_diff_to=None):

        """Create an unshelver from commandline arguments.

        The returned shelver will have a tree that is locked and should

        be unlocked.

        :param shelf_id: Integer id of the shelf, as a string.

        :param action: action to perform.  May be 'apply', 'dry-run',

            'delete', 'preview'.

        :param directory: The directory to unshelve changes into.

        :param write_diff_to: See Unshelver.__init__().

        """

        tree, path = workingtree.WorkingTree.open_containing(directory)

        tree.lock_tree_write()

        try:

            manager = tree.get_shelf_manager()

            if shelf_id is not None:

                try:

                    shelf_id = int(shelf_id)

                except ValueError:

                    raise errors.InvalidShelfId(shelf_id)

            else:

                shelf_id = manager.last_shelf()

                if shelf_id is None:

                    raise errors.BzrCommandError('No changes are shelved.')

            apply_changes = True

            delete_shelf = True

            read_shelf = True

            show_diff = False

            if action == 'dry-run':

                apply_changes = False

                delete_shelf = False

            elif action == 'preview':

                apply_changes = False

                delete_shelf = False

                show_diff = True

            elif action == 'delete-only':

                apply_changes = False

                read_shelf = False

            elif action == 'keep':

                apply_changes = True

                delete_shelf = False

        except:

            tree.unlock()

            raise

        return klass(tree, manager, shelf_id, apply_changes, delete_shelf,

                     read_shelf, show_diff, write_diff_to)

    def __init__(self, tree, manager, shelf_id, apply_changes=True,

                 delete_shelf=True, read_shelf=True, show_diff=False,

                 write_diff_to=None):

        """Constructor.

        :param tree: The working tree to unshelve into.

        :param manager: The ShelveManager containing the shelved changes.

        :param shelf_id:

        :param apply_changes: If True, apply the shelved changes to the

            working tree.

        :param delete_shelf: If True, delete the changes from the shelf.

        :param read_shelf: If True, read the changes from the shelf.

        :param show_diff: If True, show the diff that would result from

            unshelving the changes.

        :param write_diff_to: A file-like object where the diff will be

            written to. If None, ui.ui_factory.make_output_stream() will

            be used.

        """

        self.tree = tree

        manager = tree.get_shelf_manager()

        self.manager = manager

        self.shelf_id = shelf_id

        self.apply_changes = apply_changes

        self.delete_shelf = delete_shelf

        self.read_shelf = read_shelf

        self.show_diff = show_diff

        self.write_diff_to = write_diff_to

    def run(self):

        """Perform the unshelving operation."""

        self.tree.lock_tree_write()

        cleanups = [self.tree.unlock]

        try:

            if self.read_shelf:

                trace.note('Using changes with id "%d".' % self.shelf_id)

                unshelver = self.manager.get_unshelver(self.shelf_id)

                cleanups.append(unshelver.finalize)

                if unshelver.message is not None:

                    trace.note('Message: %s' % unshelver.message)

                change_reporter = delta._ChangeReporter()

                merger = unshelver.make_merger(None)

                merger.change_reporter = change_reporter

                if self.apply_changes:

                    merger.do_merge()

                elif self.show_diff:

                    self.write_diff(merger)

                else:

                    self.show_changes(merger)

            if self.delete_shelf:

                self.manager.delete_shelf(self.shelf_id)

                trace.note('Deleted changes with id "%d".' % self.shelf_id)

        finally:

            for cleanup in reversed(cleanups):

                cleanup()

    def write_diff(self, merger):

        """Write this operation's diff to self.write_diff_to."""

        tree_merger = merger.make_merger()

        tt = tree_merger.make_preview_transform()

        new_tree = tt.get_preview_tree()

        if self.write_diff_to is None:

            self.write_diff_to = ui.ui_factory.make_output_stream()

        diff.show_diff_trees(merger.this_tree, new_tree, self.write_diff_to)

        tt.finalize()

    def show_changes(self, merger):

        """Show the changes that this operation specifies."""

        tree_merger = merger.make_merger()

        # This implicitly shows the changes via the reporter, so we're done...

        tt = tree_merger.make_preview_transform()

        tt.finalize()