/brz/remove-bazaar

#!/usr/bin/env python

"""\

Just some work for generating a changeset.

"""

import bzrlib, bzrlib.errors

def _canonicalize_revision(branch, revision=None):

    """Turn some sort of revision information into a single

    set of from-to revision ids.

    A revision id can be None if there is no associated revison.

    :return: (old, new)

    """

    # This is a little clumsy because revision parsing may return

    # a single entry, or a list

    if revision is None:

        old, new = None, None

    elif isinstance(revision, (list, tuple)):

        if len(revision) == 0:

            old, new = None, None

        elif len(revision) == 1:

            old = revision[0]

            new = None

        elif len(revision) == 2:

            old = revision[0]

            new = revision[1]

        else:

            raise bzrlib.errors.BzrCommandError('revision can be'

                    ' at most 2 entries.')

    else:

        old = revision

        new = None

    if new is not None:

        new = branch.lookup_revision(new)

    if old is None:

        old = branch.last_patch()

    else:

        old = branch.lookup_revision(old)

    return old, new

def _get_trees(branch, revisions):

    """Get the old and new trees based on revision.

    """

    if revisions[0] is None:

        old_tree = branch.basis_tree()

    else:

        old_tree = branch.revision_tree(revisions[0])

    if revisions[1] is None:

        new_tree = branch.working_tree()

    else:

        new_tree = branch.revision_tree(revisions[1])

    return old_tree, new_tree

def _fake_working_revision(branch):

    """Fake a Revision object for the working tree."""

    from bzrlib.revision import Revision

    import time

    from bzrlib.osutils import local_time_offset, \

            username

    precursor = branch.last_patch()

    precursor_sha1 = branch.get_revision_sha1(precursor)

    return Revision(timestamp=time.time(),

            timezone=local_time_offset(),

            committer=username(),

            precursor=precursor,

            precursor_sha1=precursor_sha1)

class MetaInfoHeader(object):

    """Maintain all of the header information about this

    changeset.

    """

    def __init__(self, branch, revisions, delta):

        self.branch = branch

        self.delta = delta

        self._get_revision_list(revisions)

    def _get_revision_list(self, revisions):

        """This generates the list of all revisions from->to.

        """

        old_revno = None

        new_revno = None

        rh = self.branch.revision_history()

        for revno, rev in enumerate(rh):

            if rev == revisions[0]:

                old_revno = revno

            if rev == revisions[1]:

                new_revno = revno

        self.revision_list = []

        if old_revno is None:

            self.base_revision = None

            old_revno = 1

        else:

            self.base_revision = self.branch.get_revision(rh[old_revno])

        if new_revno is not None:

            for rev_id in rh[old_revno+1:new_revno+1]:

                self.revision_list.append(self.branch.get_revision(rev_id))

        else:

            for rev_id in rh[old_revno+1:]:

                self.revision_list.append(self.branch.get_revision(rev_id))

            self.revision_list.append(_fake_working_revision(self.branch))

    def write_meta_info(self, to_file):

        """Write out the meta-info portion to the supplied file."""

        from bzrlib.osutils import username

        def write(txt, key=None):

            if key:

                to_file.write('# ' + key + ': ' + txt + '\n')

            else:

                to_file.write('# ' + txt + '\n')

        write(username(), key='committer')

        if self.base_revision:

            write(self.base_revision.revision_id, key='precursor')

        first = True

        for rev in self.revision_list:

            if rev.revision_id is not None:

                if first:

                    write(rev.revision_id, key='revisions')

                    first = False

                else:

                    write('\t' + rev.revision_id)

def show_changeset(branch, revision=None, specific_files=None,

        external_diff_options=None, to_file=None):

    from bzrlib.diff import compare_trees

    if to_file is None:

        import sys

        to_file = sys.stdout

    revisions = _canonicalize_revision(branch, revision)

    print "Canonicalized revisions: %s" % (revisions,)

    old_tree, new_tree = _get_trees(branch, revisions)

    delta = compare_trees(old_tree, new_tree, want_unchanged=False,

                          specific_files=specific_files)

    meta = MetaInfoHeader(branch, revisions, delta)

    meta.write_meta_info(to_file)