/brz/remove-bazaar

# Copyright (C) 2005, 2006, 2007 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

Logs are actually written out through an abstract LogFormatter

interface, which allows for different preferred formats.  Plugins can

register formats too.

Logs can be produced in either forward (oldest->newest) or reverse

(newest->oldest) order.

Logs can be filtered to show only revisions matching a particular

search string, or within a particular range of revisions.  The range

can be given as date/times, which are reduced to revisions before

calling in here.

In verbose mode we show a summary of what changed in each particular

revision.  Note that this is the delta for changes in that revision

relative to its left-most parent, not the delta relative to the last

logged revision.  So for example if you ask for a verbose log of

changes touching hello.c you will get a list of those revisions also

listing other things that were changed in the same revision, but not

all the changes since the previous revision that touched hello.c.

"""

import codecs

from itertools import (

    izip,

    )

import re

import sys

from warnings import (

    warn,

    )

from bzrlib.lazy_import import lazy_import

lazy_import(globals(), """

from bzrlib import (

    config,

    errors,

    repository as _mod_repository,

    revision as _mod_revision,

    revisionspec,

    trace,

    tsort,

    )

""")

from bzrlib import (

    registry,

    )

from bzrlib.osutils import (

    format_date,

    get_terminal_encoding,

    terminal_width,

    )

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.repository.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 _enumerate_history(branch):

    rh = []

    revno = 1

    for rev_id in branch.revision_history():

        rh.append((revno, rev_id))

        revno += 1

    return rh

def show_log(branch,

             lf,

             specific_fileid=None,

             verbose=False,

             direction='reverse',

             start_revision=None,

             end_revision=None,

             search=None,

             limit=None,

             strict=False):

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

    :param lf: The LogFormatter object showing the output.

    :param specific_fileid: If not None, list only the commits affecting the

        specified file, rather than all commits.

    :param verbose: If True show added/changed/deleted/renamed files.

    :param direction: 'reverse' (default) is latest to earliest; 'forward' is

        earliest to latest.

    :param start_revision: If not None, only show revisions >= start_revision

    :param end_revision: If not None, only show revisions <= end_revision

    :param search: If not None, only show revisions with matching commit

        messages

    :param limit: If set, shows only 'limit' revisions, all revisions are shown

        if None or 0.

    :param strict: If True, check that revision limits are on the mainline if

       the LogFormatter requires this

    """

    branch.lock_read()

    try:

        if getattr(lf, 'begin_log', None):

            lf.begin_log()

        _show_log(branch, lf, specific_fileid, verbose, direction,

                  start_revision, end_revision, search, limit, strict)

        if getattr(lf, 'end_log', None):

            lf.end_log()

    finally:

        branch.unlock()

def _show_log(branch,

             lf,

             specific_fileid=None,

             verbose=False,

             direction='reverse',

             start_revision=None,

             end_revision=None,

             search=None,

             limit=None,

             strict=False):

    """Worker function for show_log - see show_log."""

    if not isinstance(lf, LogFormatter):

        warn("not a LogFormatter instance: %r" % lf)

    if specific_fileid:

        trace.mutter('get log for file_id %r', specific_fileid)

    # Consult the LogFormatter about what it needs and can handle

    generate_merge_revisions = getattr(lf, 'supports_merge_revisions', False)

    allow_single_merge_revision = getattr(lf,

        'supports_single_merge_revision', False)

    generate_tags = getattr(lf, 'supports_tags', False)

    if generate_tags and branch.supports_tags():

        rev_tag_dict = branch.tags.get_reverse_tag_dict()

    else:

        rev_tag_dict = {}

    generate_delta = verbose and getattr(lf, 'supports_delta', False)

    # Find and print the interesting revisions

    try:

        log_count = 0

        revision_iterator = _create_log_revision_iterator(branch,

            start_revision, end_revision, direction, specific_fileid, search,

            generate_merge_revisions, allow_single_merge_revision,

            generate_delta, strict)

        for revs in revision_iterator:

            for (rev_id, revno, merge_depth), rev, delta in revs:

                lr = LogRevision(rev, revno, merge_depth, delta,

                                 rev_tag_dict.get(rev_id))

                lf.log_revision(lr)

                if limit:

                    log_count += 1

                    if log_count >= limit:

                        return

    except _NonMainlineRevisionLimit:

        raise errors.BzrCommandError('Selected log formatter only supports'

            ' mainline revisions.')

def _create_log_revision_iterator(branch, start_revision, end_revision,

    direction, specific_fileid, search, generate_merge_revisions,

    allow_single_merge_revision, generate_delta, strict):

    """Create a revision iterator for log.

    :param branch: The branch being logged.

    :param start_revision: If not None, only show revisions >= start_revision

    :param end_revision: If not None, only show revisions <= end_revision

    :param direction: 'reverse' (default) is latest to earliest; 'forward' is

        earliest to latest.

    :param specific_fileid: If not None, list only the commits affecting the

        specified file.

    :param search: If not None, only show revisions with matching commit

        messages.

    :param generate_merge_revisions: If False, show only mainline revisions.

    :param allow_single_merge_revision: If True, logging of a single

        revision off the mainline is to be allowed

    :param generate_delta: Whether to generate a delta for each revision.

    :param strict: If True, check that revision limits are on the mainline if

       the LogFormatter requires this

    :return: An iterator over lists of ((rev_id, revno, merge_depth), rev,

        delta).

    """

    view_revisions = calculate_view_revisions(branch, start_revision,

        end_revision, direction, specific_fileid, generate_merge_revisions,

        allow_single_merge_revision, strict)

    return make_log_rev_iterator(branch, view_revisions, generate_delta, search)

class _NonMainlineRevisionLimit(Exception):

    """Raised when a revision limit is not on the mainline."""

def calculate_view_revisions(branch, start_revision, end_revision, direction,

        specific_fileid, generate_merge_revisions, allow_single_merge_revision,

        strict=True):

    """Calculate the revisions to view.

    :return: An iterator of (revision_id, dotted_revno, merge_depth) tuples OR

             a list of the same tuples.

    """

    view_revisions = _calc_view_revisions(branch, start_revision, end_revision,

        direction, generate_merge_revisions, allow_single_merge_revision,

        strict)

    if specific_fileid:

        view_revisions = _filter_revisions_touching_file_id(branch,

            specific_fileid, view_revisions)

    return view_revisions

def _calc_view_revisions(branch, start_revision, end_revision, direction,

        generate_merge_revisions, allow_single_merge_revision, strict=True):

    """Calculate the revisions to view.

    :return: An iterator of (revision_id, dotted_revno, merge_depth) tuples OR

             a list of the same tuples.

    """

    rev_limits = _get_revision_limits(branch, start_revision, end_revision)

    br_revno, _, start_revno, start_rev_id, end_revno, end_rev_id = rev_limits

    if br_revno == 0:

        return []

    # If we only want to see mainline revisions, we can iterate ...

    generate_single_revision = (start_rev_id and start_rev_id == end_rev_id)

    if not generate_merge_revisions and not generate_single_revision:

        # Note: mainline_view_revisions() returns an iterator so we can't

        # trap the _NonMainlineRevisionLimits exception here

        result = _mainline_view_revisions(branch, rev_limits)

        if direction == 'forward':

            result = reversed(list(result))

        return result

    # Otherwise, the algorithm is O(history) for now ...

    # Get the revision history, if any

    mainline_revs, rev_nos = _get_mainline_revs(branch, rev_limits)

    if not mainline_revs:

        return []

    # If a single revision is requested and it's not on the mainline,

    # generate the merge revisions

    #if (not generate_merge_revisions and generate_single_revision

    #    and ((start_rev_id and (start_rev_id not in rev_nos))

    #        or (end_rev_id and (end_rev_id not in rev_nos)))):

    #    if allow_single_merge_revision:

    #        generate_merge_revisions = True

    #    else:

    #        raise _NonMainlineRevisionLimit()

    generate_single_revision = False

    if (not generate_merge_revisions

        and ((start_rev_id and (start_rev_id not in rev_nos))

            or (end_rev_id and (end_rev_id not in rev_nos)))):

        generate_single_revision = ((start_rev_id == end_rev_id)

            and allow_single_merge_revision)

        if not generate_single_revision:

            raise _NonMainlineRevisionLimit()

        generate_merge_revisions = True

    # Do the filtering

    view_revs_iter = get_view_revisions(mainline_revs, rev_nos, branch,

                          direction, include_merges=generate_merge_revisions)

    if direction == 'reverse':

        start_rev_id, end_rev_id = end_rev_id, start_rev_id

    view_revisions = _filter_revision_range(list(view_revs_iter),

                                            start_rev_id,

                                            end_rev_id)

    if view_revisions and generate_single_revision:

        view_revisions = view_revisions[0:1]

    # Rebase merge_depth - unless there are no revisions or 

    # either the first or last revision have merge_depth = 0.

    if view_revisions and view_revisions[0][2] and view_revisions[-1][2]:

        min_depth = min([d for r,n,d in view_revisions])

        if min_depth != 0:

            view_revisions = [(r,n,d-min_depth) for r,n,d in view_revisions]

    return view_revisions

def _mainline_view_revisions(branch, revision_limits):

    """Calculate the mainline revisions to view, newest to oldest.

    :param revision_limits: a tuple as returned by _get_revision_limits()

    :return: An iterator of (revision_id, dotted_revno, merge_depth) tuples.

    :raises _NonMainlineRevisionLimit: if a start_rev_id and/or end_rev_id

      is specified and not found

    """

    br_revno, br_rev_id, start_revno, start_rev_id, end_revno, end_rev_id = \

        revision_limits

    repo = branch.repository

    cur_revno = br_revno

    rev_iter = repo.iter_reverse_revision_history(br_rev_id)

    if start_rev_id is None and end_rev_id is None:

        for revision_id in rev_iter:

            yield revision_id, str(cur_revno), 0

            cur_revno -= 1

    else:

        found_start = start_rev_id is None

        found_end = end_rev_id is None

        for revision_id in rev_iter:

            if cur_revno < start_revno:

                break

            if cur_revno <= end_revno:

                if not found_start and revision_id == start_rev_id:

                    found_start = True

                if not found_end and revision_id == end_rev_id:

                    found_end = True

                yield revision_id, str(cur_revno), 0

            cur_revno -= 1

        else:

            if not found_start or not found_end:

                raise _NonMainlineRevisionLimit()

def make_log_rev_iterator(branch, view_revisions, generate_delta, search):

    """Create a revision iterator for log.

    :param branch: The branch being logged.

    :param view_revisions: The revisions being viewed.

    :param generate_delta: Whether to generate a delta for each revision.

    :param search: A user text search string.

    :return: An iterator over lists of ((rev_id, revno, merge_depth), rev,

        delta).

    """

    # Convert view_revisions into (view, None, None) groups to fit with

    # the standard interface here.

    if type(view_revisions) == list:

        # A single batch conversion is faster than many incremental ones.

        # As we have all the data, do a batch conversion.

        nones = [None] * len(view_revisions)

        log_rev_iterator = iter([zip(view_revisions, nones, nones)])

    else:

        def _convert():

            for view in view_revisions:

                yield (view, None, None)

        log_rev_iterator = iter([_convert()])

    for adapter in log_adapters:

        log_rev_iterator = adapter(branch, generate_delta, search,

            log_rev_iterator)

    return log_rev_iterator

def _make_search_filter(branch, generate_delta, search, log_rev_iterator):

    """Create a filtered iterator of log_rev_iterator matching on a regex.

    :param branch: The branch being logged.

    :param generate_delta: Whether to generate a delta for each revision.

    :param search: A user text search string.

    :param log_rev_iterator: An input iterator containing all revisions that

        could be displayed, in lists.

    :return: An iterator over lists of ((rev_id, revno, merge_depth), rev,

        delta).

    """

    if search is None:

        return log_rev_iterator

    # Compile the search now to get early errors.

    searchRE = re.compile(search, re.IGNORECASE)

    return _filter_message_re(searchRE, log_rev_iterator)

def _filter_message_re(searchRE, log_rev_iterator):

    for revs in log_rev_iterator:

        new_revs = []

        for (rev_id, revno, merge_depth), rev, delta in revs:

            if searchRE.search(rev.message):

                new_revs.append(((rev_id, revno, merge_depth), rev, delta))

        yield new_revs

def _make_delta_filter(branch, generate_delta, search, log_rev_iterator):

    """Add revision deltas to a log iterator if needed.

    :param branch: The branch being logged.

    :param generate_delta: Whether to generate a delta for each revision.

    :param search: A user text search string.

    :param log_rev_iterator: An input iterator containing all revisions that

        could be displayed, in lists.

    :return: An iterator over lists of ((rev_id, revno, merge_depth), rev,

        delta).

    """

    if not generate_delta:

        return log_rev_iterator

    return _generate_deltas(branch.repository, log_rev_iterator)

def _generate_deltas(repository, log_rev_iterator):

    """Create deltas for each batch of revisions in log_rev_iterator."""

    for revs in log_rev_iterator:

        revisions = [rev[1] for rev in revs]

        deltas = repository.get_deltas_for_revisions(revisions)

        revs = [(rev[0], rev[1], delta) for rev, delta in izip(revs, deltas)]

        yield revs

def _make_revision_objects(branch, generate_delta, search, log_rev_iterator):

    """Extract revision objects from the repository

    :param branch: The branch being logged.

    :param generate_delta: Whether to generate a delta for each revision.

    :param search: A user text search string.

    :param log_rev_iterator: An input iterator containing all revisions that

        could be displayed, in lists.

    :return: An iterator over lists of ((rev_id, revno, merge_depth), rev,

        delta).

    """

    repository = branch.repository

    for revs in log_rev_iterator:

        # r = revision_id, n = revno, d = merge depth

        revision_ids = [view[0] for view, _, _ in revs]

        revisions = repository.get_revisions(revision_ids)

        revs = [(rev[0], revision, rev[2]) for rev, revision in

            izip(revs, revisions)]

        yield revs

def _make_batch_filter(branch, generate_delta, search, log_rev_iterator):

    """Group up a single large batch into smaller ones.

    :param branch: The branch being logged.

    :param generate_delta: Whether to generate a delta for each revision.

    :param search: A user text search string.

    :param log_rev_iterator: An input iterator containing all revisions that

        could be displayed, in lists.

    :return: An iterator over lists of ((rev_id, revno, merge_depth), rev,

        delta).

    """

    repository = branch.repository

    num = 9

    for batch in log_rev_iterator:

        batch = iter(batch)

        while True:

            step = [detail for _, detail in zip(range(num), batch)]

            if len(step) == 0:

                break

            yield step

            num = min(int(num * 1.5), 200)

def _get_revision_limits(branch, start_revision, end_revision):

    """Get and check revision limits.

    :param  branch: The branch containing the revisions. 

    :param  start_revision: The first revision to be logged.

            For backwards compatibility this may be a mainline integer revno,

            but for merge revision support a RevisionInfo is expected.

    :param  end_revision: The last revision to be logged.

            For backwards compatibility this may be a mainline integer revno,

            but for merge revision support a RevisionInfo is expected.

    :return: (br_revno, br_rev_id, start_revno, start_rev_id, end_revno,

        end_rev_id) tuple.

    """

    branch_revno, branch_rev_id = branch.last_revision_info()

    start_rev_id = None

    if start_revision is None:

        start_revno = 1

    else:

        if isinstance(start_revision, revisionspec.RevisionInfo):

            start_rev_id = start_revision.rev_id

            start_revno = start_revision.revno or 1

        else:

            branch.check_real_revno(start_revision)

            start_revno = start_revision

    end_rev_id = None

    if end_revision is None:

        end_revno = branch_revno

    else:

        if isinstance(end_revision, revisionspec.RevisionInfo):

            end_rev_id = end_revision.rev_id

            end_revno = end_revision.revno or branch_revno

        else:

            branch.check_real_revno(end_revision)

            end_revno = end_revision

    if branch_revno != 0:

        if (start_rev_id == _mod_revision.NULL_REVISION

            or end_rev_id == _mod_revision.NULL_REVISION):

            raise errors.BzrCommandError('Logging revision 0 is invalid.')

        if start_revno > end_revno:

            raise errors.BzrCommandError("Start revision must be older than "

                                         "the end revision.")

    return (branch_revno, branch_rev_id, start_revno, start_rev_id, end_revno,

        end_rev_id)

def _get_mainline_revs(branch, revision_limits):

    """Get the mainline revisions from the branch.

    Generates the list of mainline revisions for the branch. Also map the

    revisions to rev_ids, to be used in the later filtering stage.

    :param  branch: The branch containing the revisions. 

    :param revision_limits: a tuple as returned by _get_revision_limits()

    :return: A (mainline_revs, rev_nos) tuple.

    """

    (br_revno, br_rev_id, start_revno, start_rev_id, end_revno, end_rev_id) = \

        revision_limits

    cur_revno = br_revno

    rev_nos = {}

    mainline_revs = []

    for revision_id in branch.repository.iter_reverse_revision_history(

                        br_rev_id):

        if cur_revno < start_revno:

            # We have gone far enough, but we always add 1 more revision

            rev_nos[revision_id] = cur_revno

            mainline_revs.append(revision_id)

            break

        if cur_revno <= end_revno:

            rev_nos[revision_id] = cur_revno

            mainline_revs.append(revision_id)

        cur_revno -= 1

    else:

        # We walked off the edge of all revisions, so we add a 'None' marker

        mainline_revs.append(None)

    mainline_revs.reverse()

    # override the mainline to look like the revision history.

    return mainline_revs, rev_nos

def _filter_revision_range(view_revisions, start_rev_id, end_rev_id):

    """Filter view_revisions based on revision ranges.

    :param view_revisions: A list of (revision_id, dotted_revno, merge_depth) 

            tuples to be filtered.

    :param start_rev_id: If not NONE specifies the first revision to be logged.

            If NONE then all revisions up to the end_rev_id are logged.

    :param end_rev_id: If not NONE specifies the last revision to be logged.

            If NONE then all revisions up to the end of the log are logged.

    :return: The filtered view_revisions.

    """

    if start_rev_id or end_rev_id:

        revision_ids = [r for r, n, d in view_revisions]

        if start_rev_id:

            start_index = revision_ids.index(start_rev_id)

        else:

            start_index = 0

        if start_rev_id == end_rev_id:

            end_index = start_index

        else:

            if end_rev_id:

                end_index = revision_ids.index(end_rev_id)

            else:

                end_index = len(view_revisions) - 1

        # To include the revisions merged into the last revision, 

        # extend end_rev_id down to, but not including, the next rev

        # with the same or lesser merge_depth

        end_merge_depth = view_revisions[end_index][2]

        try:

            for index in xrange(end_index+1, len(view_revisions)+1):

                if view_revisions[index][2] <= end_merge_depth:

                    end_index = index - 1

                    break

        except IndexError:

            # if the search falls off the end then log to the end as well

            end_index = len(view_revisions) - 1

        view_revisions = view_revisions[start_index:end_index+1]

    return view_revisions

def _filter_revisions_touching_file_id(branch, file_id, view_revisions):

    r"""Return the list of revision ids which touch a given file id.

    The function filters view_revisions and returns a subset.

    This includes the revisions which directly change the file id,

    and the revisions which merge these changes. So if the

    revision graph is::

        A-.

        |\ \

        B C E

        |/ /

        D |

        |\|

        | F

        |/

        G

    And 'C' changes a file, then both C and D will be returned. F will not be

    returned even though it brings the changes to C into the branch starting

    with E. (Note that if we were using F as the tip instead of G, then we

    would see C, D, F.)

    This will also be restricted based on a subset of the mainline.

    :param branch: The branch where we can get text revision information.

    :param file_id: Filter out revisions that do not touch file_id.

    :param view_revisions: A list of (revision_id, dotted_revno, merge_depth)

        tuples. This is the list of revisions which will be filtered. It is

        assumed that view_revisions is in merge_sort order (i.e. newest

        revision first ).

    :return: A list of (revision_id, dotted_revno, merge_depth) tuples.

    """

    # Lookup all possible text keys to determine which ones actually modified

    # the file.

    text_keys = [(file_id, rev_id) for rev_id, revno, depth in view_revisions]

    # Looking up keys in batches of 1000 can cut the time in half, as well as

    # memory consumption. GraphIndex *does* like to look for a few keys in

    # parallel, it just doesn't like looking for *lots* of keys in parallel.

    # TODO: This code needs to be re-evaluated periodically as we tune the

    #       indexing layer. We might consider passing in hints as to the known

    #       access pattern (sparse/clustered, high success rate/low success

    #       rate). This particular access is clustered with a low success rate.

    get_parent_map = branch.repository.texts.get_parent_map

    modified_text_revisions = set()

    chunk_size = 1000

    for start in xrange(0, len(text_keys), chunk_size):

        next_keys = text_keys[start:start + chunk_size]

        # Only keep the revision_id portion of the key

        modified_text_revisions.update(

            [k[1] for k in get_parent_map(next_keys)])

    del text_keys, next_keys

    result = []

    # Track what revisions will merge the current revision, replace entries

    # with 'None' when they have been added to result

    current_merge_stack = [None]

    for info in view_revisions:

        rev_id, revno, depth = info

        if depth == len(current_merge_stack):

            current_merge_stack.append(info)

        else:

            del current_merge_stack[depth + 1:]

            current_merge_stack[-1] = info

        if rev_id in modified_text_revisions:

            # This needs to be logged, along with the extra revisions

            for idx in xrange(len(current_merge_stack)):

                node = current_merge_stack[idx]

                if node is not None:

                    result.append(node)

                    current_merge_stack[idx] = None

    return result

def get_view_revisions(mainline_revs, rev_nos, branch, direction,

                       include_merges=True):

    """Produce an iterator of revisions to show

    :return: an iterator of (revision_id, revno, merge_depth)

    (if there is no revno for a revision, None is supplied)

    """

    if include_merges is False:

        revision_ids = mainline_revs[1:]

        if direction == 'reverse':

            revision_ids.reverse()

        for revision_id in revision_ids:

            yield revision_id, str(rev_nos[revision_id]), 0

        return