~bzr-pqm/bzr/bzr.dev

# Copyright (C) 2005 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

"""Code to show logs of changes.

Various flavors of log can be produced:

* for one file, or the whole tree, and (not done yet) for

  files in a given directory

* in "verbose" mode with a description of what changed from one

  version to the next

* with file-ids and revision-ids shown

* from last to first or (not anymore) from first to last;

  the default is "reversed" because it shows the likely most

  relevant and interesting information first

* (not yet) in XML format

"""

from trace import mutter

def find_touching_revisions(branch, file_id):

    """Yield a description of revisions which affect the file_id.

    Each returned element is (revno, revision_id, description)

    This is the list of revisions where the file is either added,

    modified, renamed or deleted.

    TODO: Perhaps some way to limit this to only particular revisions,

    or to traverse a non-mainline set of revisions?

    """

    last_ie = None

    last_path = None

    revno = 1

    for revision_id in branch.revision_history():

        this_inv = branch.get_revision_inventory(revision_id)

        if file_id in this_inv:

            this_ie = this_inv[file_id]

            this_path = this_inv.id2path(file_id)

        else:

            this_ie = this_path = None

        # now we know how it was last time, and how it is in this revision.

        # are those two states effectively the same or not?

        if not this_ie and not last_ie:

            # not present in either

            pass

        elif this_ie and not last_ie:

            yield revno, revision_id, "added " + this_path

        elif not this_ie and last_ie:

            # deleted here

            yield revno, revision_id, "deleted " + last_path

        elif this_path != last_path:

            yield revno, revision_id, ("renamed %s => %s" % (last_path, this_path))

        elif (this_ie.text_size != last_ie.text_size

              or this_ie.text_sha1 != last_ie.text_sha1):

            yield revno, revision_id, "modified " + this_path

        last_ie = this_ie

        last_path = this_path

        revno += 1

def show_log(branch,

             specific_fileid=None,

             show_timezone='original',

             verbose=False,

             show_ids=False,

             to_file=None,

             direction='reverse'):

    """Write out human-readable log of commits to this branch.

    specific_fileid

        If true, list only the commits affecting the specified

        file, rather than all commits.

    show_timezone

        'original' (committer's timezone),

        'utc' (universal time), or

        'local' (local user's timezone)

    verbose

        If true show added/changed/deleted/renamed files.

    show_ids

        If true, show revision and file ids.

    to_file

        File to send log to; by default stdout.

    direction

        'reverse' (default) is latest to earliest;

        'forward' is earliest to latest.

    """

    from osutils import format_date

    from errors import BzrCheckError

    from textui import show_status

    if specific_fileid:

        mutter('get log for file_id %r' % specific_fileid)

    if to_file == None:

        import sys

        to_file = sys.stdout

    which_revs = branch.enum_history(direction)

    if not (verbose or specific_fileid):

        # no need to know what changed between revisions

        with_deltas = deltas_for_log_dummy(branch, which_revs)

    elif direction == 'reverse':

        with_deltas = deltas_for_log_reverse(branch, which_revs)

    else:        

        raise NotImplementedError("sorry, verbose forward logs not done yet")

    for revno, rev, delta in with_deltas:

        if specific_fileid:

            if not delta.touches_file_id(specific_fileid):

                continue

        if not verbose:

            # although we calculated it, throw it away without display

            delta = None

        show_one_log(revno, rev, delta, show_ids, to_file, show_timezone)

def deltas_for_log_dummy(branch, which_revs):

    for revno, revision_id in which_revs:

        yield revno, branch.get_revision(revision_id), None

def deltas_for_log_reverse(branch, which_revs):

    """Compute deltas for display in reverse log.

    Given a sequence of (revno, revision_id) pairs, return

    (revno, rev, delta).

    The delta is from the given revision to the next one in the

    sequence, which makes sense if the log is being displayed from

    newest to oldest.

    """

    from tree import EmptyTree

    from diff import compare_trees

    last_revno = last_revision_id = last_tree = None

    for revno, revision_id in which_revs:

        this_tree = branch.revision_tree(revision_id)

        this_revision = branch.get_revision(revision_id)

        if last_revno:

            yield last_revno, last_revision, compare_trees(this_tree, last_tree, False)

        last_revno = revno

        last_revision = this_revision

        last_tree = this_tree

    if last_revno:

        this_tree = EmptyTree()

        yield last_revno, last_revision, compare_trees(this_tree, last_tree, False)

def junk():

    precursor = None

    if verbose:

        from tree import EmptyTree

        prev_tree = EmptyTree()

    for revno, revision_id in which_revs:

        precursor = revision_id

    if revision_id != rev.revision_id:

        raise BzrCheckError("retrieved wrong revision: %r"

                            % (revision_id, rev.revision_id))

    if verbose:

        this_tree = branch.revision_tree(revision_id)

        delta = compare_trees(prev_tree, this_tree, want_unchanged=False)

        prev_tree = this_tree

    else:

        delta = None    

def show_one_log(revno, rev, delta, show_ids, to_file, show_timezone):

    from osutils import format_date

    print >>to_file,  '-' * 60

    print >>to_file,  'revno:', revno

    if show_ids:

        print >>to_file,  'revision-id:', rev.revision_id

    print >>to_file,  'committer:', rev.committer

    print >>to_file,  'timestamp: %s' % (format_date(rev.timestamp, rev.timezone or 0,

                                         show_timezone))

    print >>to_file,  'message:'

    if not rev.message:

        print >>to_file,  '  (no message)'

    else:

        for l in rev.message.split('\n'):

            print >>to_file,  '  ' + l

    if delta != None:

        delta.show(to_file, show_ids)