hgext/graphlog.py

graphlog: fix --removed

"hg log --removed FILE" does not return changesets where FILE was removed, but
ones where FILE was changed and possibly removed. The flag is really here to
disable walkchangerevs() fast path, which cannot see file removals by scanning
filelogs.

# ASCII graph log extension for Mercurial
#
# Copyright 2007 Joel Rosdahl <[e-mail]>
#
# 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 show_changeset
from mercurial.commands import templateopts
from mercurial.i18n import _
from mercurial.node import nullrev
from mercurial import cmdutil, commands, extensions, scmutil
from mercurial import hg, util, graphmod, templatekw

cmdtable = {}
command = cmdutil.command(cmdtable)

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:
            if 2 * end >= len(nodeline):
                continue
            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 = scmutil.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 ["newest_first"]:
        if op in opts and opts[op]:
            raise util.Abort(_("-G/--graph option is incompatible with --%s")
                             % op.replace("_", "-"))

def revset(repo, pats, opts):
    """Return revset str built of revisions, log options and file patterns.
    """
    opt2revset = {
        'follow':           ('follow()', None),
        'follow_first':     ('_followfirst()', None),
        'no_merges':        ('not merge()', None),
        'only_merges':      ('merge()', None),
        'date':             ('date(%(val)r)', None),
        'branch':           ('branch(%(val)r)', ' or '),
        '_patslog':         ('filelog(%(val)r)', ' or '),
        '_patsfollow':      ('follow(%(val)r)', ' or '),
        '_patsfollowfirst': ('_followfirst(%(val)r)', ' or '),
        'keyword':          ('keyword(%(val)r)', ' or '),
        'prune':            ('not (%(val)r or ancestors(%(val)r))', ' and '),
        'user':             ('user(%(val)r)', ' or '),
        'rev':              ('%(val)s', ' or '),
        }

    opts = dict(opts)
    # branch and only_branch are really aliases and must be handled at
    # the same time
    if 'branch' in opts and 'only_branch' in opts:
        opts['branch'] = opts['branch'] + opts.pop('only_branch')

    follow = opts.get('follow') or opts.get('follow_first')
    followfirst = opts.get('follow_first')
    if 'follow' in opts:
        del opts['follow']
    if 'follow_first' in opts:
        del opts['follow_first']
    # pats/include/exclude are passed to match.match() directly in
    # _matchfile() revset but walkchangerevs() builds its matcher with
    # scmutil.match(). The difference is input pats are globbed on
    # platforms without shell expansion (windows).
    pctx = repo[None]
    match, pats = scmutil.matchandpats(pctx, pats, opts)
    slowpath = match.anypats() or (match.files() and opts.get('removed'))
    if not slowpath:
        for f in match.files():
            if follow and f not in pctx:
                raise util.Abort(_('cannot follow file not in parent '
                                   'revision: "%s"') % f)
            filelog = repo.file(f)
            if not len(filelog):
                # A zero count may be a directory or deleted file, so
                # try to find matching entries on the slow path.
                if follow:
                    raise util.Abort(
                        _('cannot follow nonexistent file: "%s"') % f)
                slowpath = True
    if slowpath:
        # See cmdutil.walkchangerevs() slow path.
        #
        if follow:
            raise util.Abort(_('can only follow copies/renames for explicit '
                               'filenames'))
        # pats/include/exclude cannot be represented as separate
        # revset expressions as their filtering logic applies at file
        # level. For instance "-I a -X a" matches a revision touching
        # "a" and "b" while "file(a) and not file(b)" does
        # not. Besides, filesets are evaluated against the working
        # directory.
        matchargs = ['r:']
        for p in pats:
            matchargs.append('p:' + p)
        for p in opts.get('include', []):
            matchargs.append('i:' + p)
        for p in opts.get('exclude', []):
            matchargs.append('x:' + p)
        matchargs = ','.join(('%r' % p) for p in matchargs)
        opts['rev'] = opts.get('rev', []) + ['_matchfiles(%s)' % matchargs]
    else:
        if follow:
            if followfirst:
                if pats:
                    opts['_patsfollowfirst'] = list(pats)
                else:
                    opts['follow_first'] = True
            else:
                if pats:
                    opts['_patsfollow'] = list(pats)
                else:
                    opts['follow'] = True
        else:
            opts['_patslog'] = list(pats)

    revset = []
    for op, val in opts.iteritems():
        if not val:
            continue
        if op not in opt2revset:
            continue
        revop, andor = opt2revset[op]
        if '%(val)' not in revop:
            revset.append(revop)
        else:
            if not isinstance(val, list):
                expr = revop % {'val': val}
            else:
                expr = '(' + andor.join((revop % {'val': v}) for v in val) + ')'
            revset.append(expr)

    if revset:
        revset = '(' + ' and '.join(revset) + ')'
    else:
        revset = 'all()'
    return revset

def generate(ui, dag, displayer, showparents, edgefn, getrenamed=None):
    seen, state = [], asciistate()
    for rev, type, ctx, parents in dag:
        char = ctx.node() in showparents and '@' or 'o'
        copies = None
        if getrenamed and ctx.rev():
            copies = []
            for fn in ctx.files():
                rename = getrenamed(fn, ctx.rev())
                if rename:
                    copies.append((fn, rename[0]))
        displayer.show(ctx, copies=copies)
        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()

@command('glog',
    [('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]'))
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(scmutil.revrange(repo, [revset(repo, pats, opts)]), reverse=1)
    limit = cmdutil.loglimit(opts)
    if limit is not None:
        revs = revs[:limit]
    revdag = graphmod.dagwalker(repo, revs)

    getrenamed = None
    if opts.get('copies'):
        endrev = None
        if opts.get('rev'):
            endrev = max(scmutil.revrange(repo, opts.get('rev'))) + 1
        getrenamed = templatekw.getrenamedfn(repo, endrev=endrev)
    displayer = show_changeset(ui, repo, opts, buffered=True)
    showparents = [ctx.node() for ctx in repo[None].parents()]
    generate(ui, revdag, displayer, showparents, asciiedges, getrenamed)

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('log', commands.table, graphlog)
    _wrapcmd('incoming', commands.table, gincoming)
    _wrapcmd('outgoing', commands.table, goutgoing)

def _wrapcmd(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")))