# 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.

'''

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(type, char, lines, 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)

    nextseen = seen[:]

    nextseen[nodeidx:nodeidx + 1] = newparents

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

    while len(newparents) > 2:

        # ascii() only knows how to add or remove a single column between two

        # calls. Nodes with more than two parents break this constraint so we

        # introduce intermediate expansion lines to grow the active node list

        # slowly.

        edges.append((nodeidx, nodeidx))

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

        nmorecols = 1

        yield (type, char, lines, (nodeidx, edges, ncols, nmorecols))

        char = '\\'

        lines = []

        nodeidx += 1

        ncols += 1

        edges = []

        del newparents[0]

    if len(newparents) > 0:

        edges.append((nodeidx, nodeidx))

    if len(newparents) > 1:

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

    nmorecols = len(nextseen) - ncols

    seen[:] = nextseen

    yield (type, char, lines, (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(pats, opts):

    for op in ["follow_first", "copies", "newest_first"]:

        if op in opts and opts[op]:

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

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

    if pats and opts.get('follow'):

        raise util.Abort(_("-G/--graph option is incompatible with --follow "

                           "with file argument"))

def revset(pats, opts):

    """Return revset str built of revisions, log options and file patterns.

    """

    opt2revset = {

        'follow': (0, 'follow()'),

        'no_merges': (0, 'not merge()'),

        'only_merges': (0, 'merge()'),

        'removed': (0, 'removes("*")'),

        'date': (1, 'date($)'),

        'branch': (2, 'branch($)'),

        'exclude': (2, 'not file($)'),

        'include': (2, 'file($)'),

        'keyword': (2, 'keyword($)'),

        'only_branch': (2, 'branch($)'),

        'prune': (2, 'not ($ or ancestors($))'),

        'user': (2, 'user($)'),

        }

    optrevset = []

    revset = []

    for op, val in opts.iteritems():

        if not val:

            continue

        if op == 'rev':

            # Already a revset

            revset.extend(val)

        if op not in opt2revset:

            continue

        arity, revop = opt2revset[op]

        revop = revop.replace('$', '%(val)r')

        if arity == 0:

            optrevset.append(revop)

        elif arity == 1:

            optrevset.append(revop % {'val': val})

        else:

            for f in val:

                optrevset.append(revop % {'val': f})

    for path in pats:

        optrevset.append('file(%r)' % path)

    if revset or optrevset:

        if revset:

            revset = ['(' + ' or '.join(revset) + ')']

        if optrevset:

            revset.append('(' + ' and '.join(optrevset) + ')')

        revset = ' and '.join(revset)

    else:

        revset = 'all()'

    return revset

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)

        edges = edgefn(type, char, lines, seen, rev, parents)

        for type, char, lines, coldata in edges:

            ascii(ui, state, type, char, lines, coldata)

    displayer.close()

def graphlog(ui, repo, *pats, **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(pats, opts)

    revs = sorted(revrange(repo, [revset(pats, opts)]), reverse=1)

    limit = cmdutil.loglimit(opts)

    if limit is not None:

        revs = revs[:limit]

    revdag = graphmod.dagwalker(repo, revs)

    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.

    """