/b-gtk/fix-viz

# -*- coding: UTF-8 -*-

"""Directed graph production.

This module contains the code to produce an ordered directed graph of a

bzr branch, such as we display in the tree view at the top of the bzrk

window.

"""

__copyright__ = "Copyright © 2005 Canonical Ltd."

__author__    = "Scott James Remnant <scott@ubuntu.com>"

from bzrlib.tsort import merge_sort

def linegraph(branch, start, maxnum):

    """Produce a directed graph of a bzr branch.

    Returns a list of tuples of (revid,

                                 node,

                                 lines,

                                 parents,

                                 children,

                                 revno_sequence).

    Node is a tuple of (column, colour) with column being a zero-indexed

    column number of the graph that this revision represents and colour

    being a zero-indexed colour (which doesn't specify any actual colour

    in particular) to draw the node in.

    Lines is a list of tuples which represent lines you should draw away

    from the revision, if you also need to draw lines into the revision

    you should use the lines list from the previous iteration.  Each

    typle in the list is in the form (start, end, colour) with start and

    end being zero-indexed column numbers and colour as in node.

    It's up to you how to actually draw the nodes and lines (straight,

    curved, kinked, etc.) and to pick the actual colours for each index.

    """

    mainline = branch.revision_history()

    graph_parents = branch.repository.get_revision_graph(start)

    graph_children = {}

    for revid in graph_parents.keys():

        graph_children[revid] = []

    merge_sorted_revisions = merge_sort(

        graph_parents,

        start,

        mainline,

        generate_revno=True)

    revid_index = {}

    revno_index = {}

    branch_lines = {}

    linegraph = []    

    for (index, (sequence_number,

                 revid,

                 merge_depth,

                 revno_sequence,

                 end_of_merge)) in enumerate(merge_sorted_revisions):

        revid_index[revid] = index

        revno_index[revno_sequence] = index

        branch_id = revno_sequence[0:-1]

        branch_line = None

        if branch_id not in branch_lines:

            branch_line = {}

            branch_lines[branch_id] = branch_line

            branch_line["rev_indexes"] = []

            branch_line["min_index"] = index - 1            

            branch_line["max_index"] = 0

        else:

            branch_line = branch_lines[branch_id]

        branch_line["rev_indexes"].append(index)

        if index > branch_line["max_index"]:

            branch_line["max_index"] = index

        parents = graph_parents[revid]

        for parent_revid in parents:

            graph_children[parent_revid].append(revid)

        linegraph.append([revid,

                          None,

                          [],

                          parents,

                          None,

                          revno_sequence])

    branch_ids = branch_lines.keys()

    branch_ids.sort()

    columns = []

    for branch_id in branch_ids:

        branch_line = branch_lines[branch_id]

        if len(branch_id) >= 2:

            branch_parent_revno = branch_id[0:-1]

            if branch_parent_revno in revno_index:

                branch_line["max_index"] = revno_index[branch_parent_revno]

        col_index = None

        start_col_index = 0

        if branch_id:

            start_col_index = branch_lines[branch_id[0:-2]]["col_index"]+1

        for col_search_index in range(start_col_index,len(columns)):

            column = columns[col_search_index]

            clashing_lines = []

            for line in column:

                if (line["min_index"] <= branch_line["min_index"] and \

                    line["max_index"] >  branch_line["min_index"]) or \

                   (line["max_index"] >= branch_line["max_index"] and \

                    line["min_index"] <  branch_line["max_index"]):

                        clashing_lines.append(line)

            if not clashing_lines:

                col_index = col_search_index

                break

        if not col_index:

            col_index = len(columns)

            columns.append([])

        columns[col_index].append(branch_line)

        branch_line["col_index"] = col_index

    for branch_id in branch_ids:

        branch_line = branch_lines[branch_id]

        color = reduce(lambda x, y: x+y, branch_id, 0)

        col_index = branch_line["col_index"]

        node = (col_index, color)

        for rev_index in branch_line["rev_indexes"]:

            (sequence_number,

                 revid,

                 merge_depth,

                 revno_sequence,

                 end_of_merge) = merge_sorted_revisions[rev_index]

            children = graph_children[revid]

            linegraph[rev_index][1] = node

            linegraph[rev_index][4] = children

            for child_revid in children:

                if child_revid in revid_index:

                    child_index = revid_index[child_revid]

                    child_revno_sequence = \

                                        merge_sorted_revisions[child_index][3]

                    child_merge_depth = merge_sorted_revisions[child_index][2]

                    child_branch_id = child_revno_sequence[0:-1]

                    child_col_index = branch_lines[child_branch_id]["col_index"]

                    if child_merge_depth < merge_depth:

                        #out from the child to line

                        linegraph[child_index][2].append(

                            (child_col_index,

                             col_index,

                             color))

                        for line_part_index in range(child_index+1, rev_index):

                            linegraph[line_part_index][2].append(

                                (col_index,

                                 col_index,

                                 color))

                    else:

                        for line_part_index in range(child_index, rev_index-1):

                            linegraph[line_part_index][2].append(

                                (child_col_index,   

                                 child_col_index,

                                 color))

                        linegraph[rev_index-1][2].append(

                            (child_col_index,

                             col_index,

                             color))

    return (linegraph, revid_index)

def same_branch(a, b):

    """Return whether we think revisions a and b are on the same branch."""

    if len(a.parent_ids) == 1:

        # Defacto same branch if only parent

        return True

    elif a.committer == b.committer:

        # Same committer so may as well be

        return True

    else:

        return False