# ASCII graph log extension for Mercurial

#

# Copyright 2007 Joel Rosdahl <joel@rosdahl.net>

#

# This software may be used and distributed according to the terms of the

# GNU General Public License version 2 or any later version.

'''command to view revision graphs from a shell

This extension adds a --graph option to the incoming, outgoing and log

commands. When this options is given, an ASCII representation of the

revision graph is also shown.

'''

import os

from mercurial.cmdutil import revrange, show_changeset

from mercurial.commands import templateopts

from mercurial.i18n import _

from mercurial.node import nullrev

from mercurial import cmdutil, commands, extensions

from mercurial import hg, util, graphmod

ASCIIDATA = 'ASC'

def asciiedges(seen, rev, parents):

    """adds edge info to changelog DAG walk suitable for ascii()"""

    if rev not in seen:

        seen.append(rev)

    nodeidx = seen.index(rev)

    knownparents = []

    newparents = []

    for parent in parents:

        if parent in seen:

            knownparents.append(parent)

        else:

            newparents.append(parent)

    ncols = len(seen)

    seen[nodeidx:nodeidx + 1] = newparents

    edges = [(nodeidx, seen.index(p)) for p in knownparents]

    if len(newparents) > 0:

        edges.append((nodeidx, nodeidx))

    if len(newparents) > 1:

        edges.append((nodeidx, nodeidx + 1))

    nmorecols = len(seen) - ncols

    return nodeidx, edges, ncols, nmorecols

def fix_long_right_edges(edges):

    for (i, (start, end)) in enumerate(edges):

        if end > start:

            edges[i] = (start, end + 1)

def get_nodeline_edges_tail(

        node_index, p_node_index, n_columns, n_columns_diff, p_diff, fix_tail):

    if fix_tail and n_columns_diff == p_diff and n_columns_diff != 0:

        # Still going in the same non-vertical direction.

        if n_columns_diff == -1:

            start = max(node_index + 1, p_node_index)

            tail = ["|", " "] * (start - node_index - 1)

            tail.extend(["/", " "] * (n_columns - start))

            return tail

        else:

            return ["\\", " "] * (n_columns - node_index - 1)

    else:

        return ["|", " "] * (n_columns - node_index - 1)

def draw_edges(edges, nodeline, interline):

    for (start, end) in edges:

        if start == end + 1:

            interline[2 * end + 1] = "/"

        elif start == end - 1:

            interline[2 * start + 1] = "\\"

        elif start == end:

            interline[2 * start] = "|"

        else:

            nodeline[2 * end] = "+"

            if start > end:

                (start, end) = (end, start)

            for i in range(2 * start + 1, 2 * end):

                if nodeline[i] != "+":

                    nodeline[i] = "-"

def get_padding_line(ni, n_columns, edges):

    line = []

    line.extend(["|", " "] * ni)

    if (ni, ni - 1) in edges or (ni, ni) in edges:

        # (ni, ni - 1)      (ni, ni)

        # | | | |           | | | |

        # +---o |           | o---+

        # | | c |           | c | |

        # | |/ /            | |/ /

        # | | |             | | |

        c = "|"

    else:

        c = " "

    line.extend([c, " "])

    line.extend(["|", " "] * (n_columns - ni - 1))

    return line

def asciistate():

    """returns the initial value for the "state" argument to ascii()"""

    return [0, 0]

def ascii(ui, state, type, char, text, coldata):

    """prints an ASCII graph of the DAG

    takes the following arguments (one call per node in the graph):

      - ui to write to

      - Somewhere to keep the needed state in (init to asciistate())

      - Column of the current node in the set of ongoing edges.

      - Type indicator of node data == ASCIIDATA.

      - Payload: (char, lines):

        - Character to use as node's symbol.

        - List of lines to display as the node's text.

      - Edges; a list of (col, next_col) indicating the edges between

        the current node and its parents.

      - Number of columns (ongoing edges) in the current revision.

      - The difference between the number of columns (ongoing edges)

        in the next revision and the number of columns (ongoing edges)

        in the current revision. That is: -1 means one column removed;

        0 means no columns added or removed; 1 means one column added.

    """

    idx, edges, ncols, coldiff = coldata

    assert -2 < coldiff < 2

    if coldiff == -1:

        # Transform

        #

        #     | | |        | | |

        #     o | |  into  o---+

        #     |X /         |/ /

        #     | |          | |

        fix_long_right_edges(edges)

    # add_padding_line says whether to rewrite

    #

    #     | | | |        | | | |

    #     | o---+  into  | o---+

    #     |  / /         |   | |  # <--- padding line

    #     o | |          |  / /

    #                    o | |

    add_padding_line = (len(text) > 2 and coldiff == -1 and

                        [x for (x, y) in edges if x + 1 < y])

    # fix_nodeline_tail says whether to rewrite

    #

    #     | | o | |        | | o | |

    #     | | |/ /         | | |/ /

    #     | o | |    into  | o / /   # <--- fixed nodeline tail

    #     | |/ /           | |/ /

    #     o | |            o | |

    fix_nodeline_tail = len(text) <= 2 and not add_padding_line

    # nodeline is the line containing the node character (typically o)

    nodeline = ["|", " "] * idx

    nodeline.extend([char, " "])

    nodeline.extend(

        get_nodeline_edges_tail(idx, state[1], ncols, coldiff,

                                state[0], fix_nodeline_tail))

    # shift_interline is the line containing the non-vertical

    # edges between this entry and the next

    shift_interline = ["|", " "] * idx

    if coldiff == -1:

        n_spaces = 1

        edge_ch = "/"

    elif coldiff == 0:

        n_spaces = 2

        edge_ch = "|"

    else:

        n_spaces = 3

        edge_ch = "\\"

    shift_interline.extend(n_spaces * [" "])

    shift_interline.extend([edge_ch, " "] * (ncols - idx - 1))

    # draw edges from the current node to its parents

    draw_edges(edges, nodeline, shift_interline)

    # lines is the list of all graph lines to print

    lines = [nodeline]

    if add_padding_line:

        lines.append(get_padding_line(idx, ncols, edges))

    lines.append(shift_interline)

    # make sure that there are as many graph lines as there are

    # log strings

    while len(text) < len(lines):

        text.append("")

    if len(lines) < len(text):

        extra_interline = ["|", " "] * (ncols + coldiff)

        while len(lines) < len(text):

            lines.append(extra_interline)

    # print lines

    indentation_level = max(ncols, ncols + coldiff)

    for (line, logstr) in zip(lines, text):

        ln = "%-*s %s" % (2 * indentation_level, "".join(line), logstr)

        ui.write(ln.rstrip() + '\n')

    # ... and start over

    state[0] = coldiff

    state[1] = idx

def get_revs(repo, rev_opt):

    if rev_opt:

        revs = revrange(repo, rev_opt)

        if len(revs) == 0:

            return (nullrev, nullrev)

        return (max(revs), min(revs))

    else:

        return (len(repo) - 1, 0)

def check_unsupported_flags(opts):

    for op in ["follow", "follow_first", "date", "copies", "keyword", "remove",

               "only_merges", "user", "branch", "only_branch", "prune",

               "newest_first", "no_merges", "include", "exclude"]:

        if op in opts and opts[op]:

            raise util.Abort(_("--graph option is incompatible with --%s")

                             % op.replace("_", "-"))

def generate(ui, dag, displayer, showparents, edgefn):

    seen, state = [], asciistate()

    for rev, type, ctx, parents in dag:

        char = ctx.node() in showparents and '@' or 'o'

        displayer.show(ctx)

        lines = displayer.hunk.pop(rev).split('\n')[:-1]

        displayer.flush(rev)

        ascii(ui, state, type, char, lines, edgefn(seen, rev, parents))

    displayer.close()

def graphlog(ui, repo, path=None, **opts):

    """show revision history alongside an ASCII revision graph

    Print a revision history alongside a revision graph drawn with

    ASCII characters.

    Nodes printed as an @ character are parents of the working

    directory.

    """

    check_unsupported_flags(opts)

    limit = cmdutil.loglimit(opts)

    start, stop = get_revs(repo, opts["rev"])

    if start == nullrev:

        return

    if path:

        path = util.canonpath(repo.root, os.getcwd(), path)

    if path: # could be reset in canonpath

        revdag = graphmod.filerevs(repo, path, start, stop, limit)

    else:

        if limit is not None:

            stop = max(stop, start - limit + 1)

        revdag = graphmod.revisions(repo, start, stop)

    displayer = show_changeset(ui, repo, opts, buffered=True)

    showparents = [ctx.node() for ctx in repo[None].parents()]

    generate(ui, revdag, displayer, showparents, asciiedges)

def graphrevs(repo, nodes, opts):

    limit = cmdutil.loglimit(opts)

    nodes.reverse()

    if limit is not None:

        nodes = nodes[:limit]

    return graphmod.nodes(repo, nodes)

def goutgoing(ui, repo, dest=None, **opts):

    """show the outgoing changesets alongside an ASCII revision graph

    Print the outgoing changesets alongside a revision graph drawn with

    ASCII characters.

    Nodes printed as an @ character are parents of the working

    directory.

    """

    check_unsupported_flags(opts)

    o = hg._outgoing(ui, repo, dest, opts)

    if o is None:

        return

    revdag = graphrevs(repo, o, opts)

    displayer = show_changeset(ui, repo, opts, buffered=True)

    showparents = [ctx.node() for ctx in repo[None].parents()]

    generate(ui, revdag, displayer, showparents, asciiedges)

def gincoming(ui, repo, source="default", **opts):

    """show the incoming changesets alongside an ASCII revision graph

    Print the incoming changesets alongside a revision graph drawn with

    ASCII characters.

    Nodes printed as an @ character are parents of the working

    directory.

    """

    def subreporecurse():

        return 1

    check_unsupported_flags(opts)

    def display(other, chlist, displayer):

        revdag = graphrevs(other, chlist, opts)

        showparents = [ctx.node() for ctx in repo[None].parents()]

        generate(ui, revdag, displayer, showparents, asciiedges)

    hg._incoming(display, subreporecurse, ui, repo, source, opts, buffered=True)

def uisetup(ui):

    '''Initialize the extension.'''

    _wrapcmd(ui, 'log', commands.table, graphlog)

    _wrapcmd(ui, 'incoming', commands.table, gincoming)

    _wrapcmd(ui, 'outgoing', commands.table, goutgoing)

def _wrapcmd(ui, cmd, table, wrapfn):

    '''wrap the command'''

    def graph(orig, *args, **kwargs):

        if kwargs['graph']:

            return wrapfn(*args, **kwargs)

        return orig(*args, **kwargs)

    entry = extensions.wrapcommand(table, cmd, graph)

    entry[1].append(('G', 'graph', None, _("show the revision DAG")))

cmdtable = {

    "glog":

        (graphlog,

         [('l', 'limit', '',

           _('limit number of changes displayed'), _('NUM')),

          ('p', 'patch', False, _('show patch')),

          ('r', 'rev', [],

           _('show the specified revision or range'), _('REV')),

         ] + templateopts,

         _('hg glog [OPTION]... [FILE]')),

}