/brz/remove-bazaar

#!/usr/bin/env python

"""\

Remove the last revision from the history of the current branch.

"""

import os

import bzrlib

def test_remove(filename):

    if os.path.exists(filename):

        os.remove(filename)

    else:

        print '* file does not exist: %r' % filename

def uncommit(branch, remove_files=False,

        dry_run=False, verbose=False, revno=None):

    """Remove the last revision from the supplied branch.

    :param remove_files: If True, remove files from the stores

        as well.

    :param force: Don't ask any questions

    """

    from bzrlib.atomicfile import AtomicFile

    rh = branch.revision_history()

    if revno is None:

        revno = len(rh)

    files_to_remove = []

    new_rev_history = AtomicFile(branch.controlfilename('revision-history'))

    for r in range(revno-1, len(rh)):

        rev_id = rh.pop()

        if verbose:

            print 'Removing revno %d: %s' % (len(rh)+1, rev_id)

        rev = branch.get_revision(rev_id)

        inv = branch.get_revision_inventory(rev_id)

        inv_prev = []

        for p in rev.parent_ids:

            inv_prev.append(branch.get_revision_inventory(p))

        if remove_files:

            # Figure out what text-store entries are new

            # In the future, when we have text_version instead of

            # text_id, we can just check to see if the text_version

            # equals the current revision id.

            for file_id in inv:

                ie = inv[file_id]

                if not hasattr(ie, 'text_id'):

                    continue

                for other_inv in inv_prev:

                    if file_id in other_inv:

                        other_ie = other_inv[file_id]

                        if other_ie.text_id == ie.text_id:

                            break

                else:

                    # None of the previous ancestors used

                    # the same inventory

                    files_to_remove.append(branch.controlfilename(['text-store',

                        ie.text_id + '.gz']))

            rev_file = branch.controlfilename(['revision-store',

                    rev_id + '.gz'])

            files_to_remove.append(rev_file)

            inv_file = branch.controlfilename(['inventory-store',

                    rev.inventory_id + '.gz'])

            files_to_remove.append(inv_file)

    if verbose and files_to_remove:

        print 'Removing files:'

        for f in files_to_remove:

            print '\t%s' % branch.relpath(f)

    new_rev_history.write('\n'.join(rh))

    # Committing before we start removing files, because

    # once we have removed at least one, all the rest are invalid.

    if not dry_run:

        new_rev_history.commit()

        if remove_files:

            # Actually start removing files

            for f in files_to_remove:

                test_remove(f)

    else:

        new_rev_history.abort()