~bzr-pqm/bzr/bzr.dev

# Copyright (C) 2004, 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

"""File annotate based on weave storage"""

# TODO: Choice of more or less verbose formats:

# 

# interposed: show more details between blocks of modified lines

# TODO: Show which revision caused a line to merge into the parent

# TODO: perhaps abbreviate timescales depending on how recent they are

# e.g. "3:12 Tue", "13 Oct", "Oct 2005", etc.  

import sys

import time

from bzrlib import (

    errors,

    osutils,

    patiencediff,

    tsort,

    )

from bzrlib.config import extract_email_address

def annotate_file(branch, rev_id, file_id, verbose=False, full=False,

                  to_file=None, show_ids=False):

    """Annotate file_id at revision rev_id in branch.

    The branch should already be read_locked() when annotate_file is called.

    :param branch: The branch to look for revision numbers and history from.

    :param rev_id: The revision id to annotate.

    :param file_id: The file_id to annotate.

    :param verbose: Show all details rather than truncating to ensure

        reasonable text width.

    :param full: XXXX Not sure what this does.

    :param to_file: The file to output the annotation to; if None stdout is

        used.

    :param show_ids: Show revision ids in the annotation output.

    """

    if to_file is None:

        to_file = sys.stdout

    # Handle the show_ids case

    last_rev_id = None

    if show_ids:

        annotations = _annotations(branch.repository, file_id, rev_id)

        max_origin_len = max(len(origin) for origin, text in annotations)

        for origin, text in annotations:

            if full or last_rev_id != origin:

                this = origin

            else:

                this = ''

            to_file.write('%*s | %s' % (max_origin_len, this, text))

            last_rev_id = origin

        return

    # Calculate the lengths of the various columns

    annotation = list(_annotate_file(branch, rev_id, file_id))

    if len(annotation) == 0:

        max_origin_len = max_revno_len = max_revid_len = 0

    else:

        max_origin_len = max(len(x[1]) for x in annotation)

        max_revno_len = max(len(x[0]) for x in annotation)

        max_revid_len = max(len(x[3]) for x in annotation)

    if not verbose:

        max_revno_len = min(max_revno_len, 12)

    max_revno_len = max(max_revno_len, 3)

    # Output the annotations

    prevanno = ''

    encoding = getattr(to_file, 'encoding', None) or \

            osutils.get_terminal_encoding()

    for (revno_str, author, date_str, line_rev_id, text) in annotation:

        if verbose:

            anno = '%-*s %-*s %8s ' % (max_revno_len, revno_str,

                                       max_origin_len, author, date_str)

        else:

            if len(revno_str) > max_revno_len:

                revno_str = revno_str[:max_revno_len-1] + '>'

            anno = "%-*s %-7s " % (max_revno_len, revno_str, author[:7])

        if anno.lstrip() == "" and full:

            anno = prevanno

        try:

            to_file.write(anno)

        except UnicodeEncodeError:

            # cmd_annotate should be passing in an 'exact' object, which means

            # we have a direct handle to sys.stdout or equivalent. It may not

            # be able to handle the exact Unicode characters, but 'annotate' is

            # a user function (non-scripting), so shouldn't die because of

            # unrepresentable annotation characters. So encode using 'replace',

            # and write them again.

            to_file.write(anno.encode(encoding, 'replace'))

        to_file.write('| %s\n' % (text,))

        prevanno = anno

def _annotations(repo, file_id, rev_id):

    """Return the list of (origin_revision_id, line_text) for a revision of a file in a repository."""

    annotations = repo.texts.annotate((file_id, rev_id))

    # 

    return [(key[-1], line) for (key, line) in annotations]

def _annotate_file(branch, rev_id, file_id):

    """Yield the origins for each line of a file.

    This includes detailed information, such as the author name, and

    date string for the commit, rather than just the revision id.

    """

    revision_id_to_revno = branch.get_revision_id_to_revno_map()

    annotations = _annotations(branch.repository, file_id, rev_id)

    last_origin = None

    revision_ids = set(o for o, t in annotations)

    revision_ids = [o for o in revision_ids if 

                    branch.repository.has_revision(o)]

    revisions = dict((r.revision_id, r) for r in 

                     branch.repository.get_revisions(revision_ids))

    for origin, text in annotations:

        text = text.rstrip('\r\n')

        if origin == last_origin:

            (revno_str, author, date_str) = ('','','')

        else:

            last_origin = origin

            if origin not in revisions:

                (revno_str, author, date_str) = ('?','?','?')

            else:

                revno_str = '.'.join(str(i) for i in

                                            revision_id_to_revno[origin])

            rev = revisions[origin]

            tz = rev.timezone or 0

            date_str = time.strftime('%Y%m%d',

                                     time.gmtime(rev.timestamp + tz))

            # a lazy way to get something like the email address

            # TODO: Get real email address

            author = rev.get_apparent_author()

            try:

                author = extract_email_address(author)

            except errors.NoEmailInUsername:

                pass        # use the whole name

        yield (revno_str, author, date_str, origin, text)

def reannotate(parents_lines, new_lines, new_revision_id,

               _left_matching_blocks=None,

               heads_provider=None):

    """Create a new annotated version from new lines and parent annotations.

    :param parents_lines: List of annotated lines for all parents

    :param new_lines: The un-annotated new lines

    :param new_revision_id: The revision-id to associate with new lines

        (will often be CURRENT_REVISION)

    :param left_matching_blocks: a hint about which areas are common

        between the text and its left-hand-parent.  The format is

        the SequenceMatcher.get_matching_blocks format

        (start_left, start_right, length_of_match).

    :param heads_provider: An object which provids a .heads() call to resolve

        if any revision ids are children of others.

        If None, then any ancestry disputes will be resolved with

        new_revision_id

    """

    if len(parents_lines) == 0:

        lines = [(new_revision_id, line) for line in new_lines]

    elif len(parents_lines) == 1:

        lines = _reannotate(parents_lines[0], new_lines, new_revision_id,

                            _left_matching_blocks)

    elif len(parents_lines) == 2:

        left = _reannotate(parents_lines[0], new_lines, new_revision_id,

                           _left_matching_blocks)

        lines = _reannotate_annotated(parents_lines[1], new_lines,

                                      new_revision_id, left,

                                      heads_provider)

    else:

        reannotations = [_reannotate(parents_lines[0], new_lines,

                                     new_revision_id, _left_matching_blocks)]

        reannotations.extend(_reannotate(p, new_lines, new_revision_id)

                             for p in parents_lines[1:])

        lines = []

        for annos in zip(*reannotations):

            origins = set(a for a, l in annos)

            if len(origins) == 1:

                # All the parents agree, so just return the first one

                lines.append(annos[0])

            else:

                line = annos[0][1]

                if len(origins) == 2 and new_revision_id in origins:

                    origins.remove(new_revision_id)

                if len(origins) == 1:

                    lines.append((origins.pop(), line))

                else:

                    lines.append((new_revision_id, line))

    return lines

def _reannotate(parent_lines, new_lines, new_revision_id,

                matching_blocks=None):

    new_cur = 0

    if matching_blocks is None:

        plain_parent_lines = [l for r, l in parent_lines]

        matcher = patiencediff.PatienceSequenceMatcher(None,

            plain_parent_lines, new_lines)

        matching_blocks = matcher.get_matching_blocks()

    lines = []

    for i, j, n in matching_blocks:

        for line in new_lines[new_cur:j]:

            lines.append((new_revision_id, line))

        lines.extend(parent_lines[i:i+n])

        new_cur = j + n

    return lines

def _get_matching_blocks(old, new):

    matcher = patiencediff.PatienceSequenceMatcher(None,

        old, new)

    return matcher.get_matching_blocks()

def _find_matching_unannotated_lines(output_lines, plain_child_lines,

                                     child_lines, start_child, end_child,

                                     right_lines, start_right, end_right,

                                     heads_provider, revision_id):

    """Find lines in plain_right_lines that match the existing lines.

    :param output_lines: Append final annotated lines to this list

    :param plain_child_lines: The unannotated new lines for the child text

    :param child_lines: Lines for the child text which have been annotated

        for the left parent

    :param start_child: Position in plain_child_lines and child_lines to start the

        match searching

    :param end_child: Last position in plain_child_lines and child_lines to search

        for a match

    :param right_lines: The annotated lines for the whole text for the right

        parent

    :param start_right: Position in right_lines to start the match

    :param end_right: Last position in right_lines to search for a match

    :param heads_provider: When parents disagree on the lineage of a line, we

        need to check if one side supersedes the other

    :param revision_id: The label to give if a line should be labeled 'tip'

    """

    output_extend = output_lines.extend

    output_append = output_lines.append

    # We need to see if any of the unannotated lines match

    plain_right_subset = [l for a,l in right_lines[start_right:end_right]]

    plain_child_subset = plain_child_lines[start_child:end_child]

    match_blocks = _get_matching_blocks(plain_right_subset, plain_child_subset)

    last_child_idx = 0

    for right_idx, child_idx, match_len in match_blocks:

        # All the lines that don't match are just passed along

        if child_idx > last_child_idx:

            output_extend(child_lines[start_child + last_child_idx

                                      :start_child + child_idx])

        for offset in xrange(match_len):

            left = child_lines[start_child+child_idx+offset]

            right = right_lines[start_right+right_idx+offset]

            if left[0] == right[0]:

                # The annotations match, just return the left one

                output_append(left)

            elif left[0] == revision_id:

                # The left parent marked this as unmatched, so let the

                # right parent claim it

                output_append(right)

            else:

                # Left and Right both claim this line

                if heads_provider is None:

                    output_append((revision_id, left[1]))

                else:

                    heads = heads_provider.heads((left[0], right[0]))

                    if len(heads) == 1:

                        output_append((iter(heads).next(), left[1]))

                    else:

                        # Both claim different origins

                        output_append((revision_id, left[1]))

                        # We know that revision_id is the head for

                        # left and right, so cache it

                        heads_provider.cache(

                            (revision_id, left[0]),

                            (revision_id,))

                        heads_provider.cache(

                            (revision_id, right[0]),

                            (revision_id,))

        last_child_idx = child_idx + match_len

def _reannotate_annotated(right_parent_lines, new_lines, new_revision_id,

                          annotated_lines, heads_provider):

    """Update the annotations for a node based on another parent.

    :param right_parent_lines: A list of annotated lines for the right-hand

        parent.

    :param new_lines: The unannotated new lines.

    :param new_revision_id: The revision_id to attribute to lines which are not

        present in either parent.

    :param annotated_lines: A list of annotated lines. This should be the

        annotation of new_lines based on parents seen so far.

    :param heads_provider: When parents disagree on the lineage of a line, we

        need to check if one side supersedes the other.

    """

    if len(new_lines) != len(annotated_lines):

        raise AssertionError("mismatched new_lines and annotated_lines")

    # First compare the newly annotated lines with the right annotated lines.

    # Lines which were not changed in left or right should match. This tends to

    # be the bulk of the lines, and they will need no further processing.

    lines = []

    lines_extend = lines.extend

    last_right_idx = 0 # The line just after the last match from the right side

    last_left_idx = 0

    matching_left_and_right = _get_matching_blocks(right_parent_lines,

                                                   annotated_lines)

    for right_idx, left_idx, match_len in matching_left_and_right:

        # annotated lines from last_left_idx to left_idx did not match the lines from

        # last_right_idx

        # to right_idx, the raw lines should be compared to determine what annotations

        # need to be updated

        if last_right_idx == right_idx or last_left_idx == left_idx:

            # One of the sides is empty, so this is a pure insertion

            lines_extend(annotated_lines[last_left_idx:left_idx])

        else:

            # We need to see if any of the unannotated lines match

            _find_matching_unannotated_lines(lines,

                                             new_lines, annotated_lines,

                                             last_left_idx, left_idx,

                                             right_parent_lines,

                                             last_right_idx, right_idx,

                                             heads_provider,

                                             new_revision_id)

        last_right_idx = right_idx + match_len

        last_left_idx = left_idx + match_len

        # If left and right agree on a range, just push that into the output

        lines_extend(annotated_lines[left_idx:left_idx + match_len])

    return lines