# 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 show_changeset
from mercurial.i18n import _
from mercurial import cmdutil, commands, extensions, scmutil
from mercurial import hg, util, graphmod, templatekw, revset

cmdtable = {}
command = cmdutil.command(cmdtable)
testedwith = 'internal'

def _checkunsupportedflags(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 _makefilematcher(repo, pats, followfirst):
    # When displaying a revision with --patch --follow FILE, we have
    # to know which file of the revision must be diffed. With
    # --follow, we want the names of the ancestors of FILE in the
    # revision, stored in "fcache". "fcache" is populated by
    # reproducing the graph traversal already done by --follow revset
    # and relating linkrevs to file names (which is not "correct" but
    # good enough).
    fcache = {}
    fcacheready = [False]
    pctx = repo['.']
    wctx = repo[None]

    def populate():
        for fn in pats:
            for i in ((pctx[fn],), pctx[fn].ancestors(followfirst=followfirst)):
                for c in i:
                    fcache.setdefault(c.linkrev(), set()).add(c.path())

    def filematcher(rev):
        if not fcacheready[0]:
            # Lazy initialization
            fcacheready[0] = True
            populate()
        return scmutil.match(wctx, fcache.get(rev, []), default='path')

    return filematcher

def _makelogrevset(repo, pats, opts, revs):
    """Return (expr, filematcher) where expr is a revset string built
    from log options and file patterns or None. If --stat or --patch
    are not passed filematcher is None. Otherwise it is a callable
    taking a revision number and returning a match objects filtering
    the files to be detailed when displaying the revision.
    """
    opt2revset = {
        'no_merges':        ('not merge()', None),
        'only_merges':      ('merge()', None),
        '_ancestors':       ('ancestors(%(val)s)', None),
        '_fancestors':      ('_firstancestors(%(val)s)', None),
        '_descendants':     ('descendants(%(val)s)', None),
        '_fdescendants':    ('_firstdescendants(%(val)s)', None),
        '_matchfiles':      ('_matchfiles(%(val)s)', 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 '),
        }

    opts = dict(opts)
    # follow or not follow?
    follow = opts.get('follow') or opts.get('follow_first')
    followfirst = opts.get('follow_first') and 1 or 0
    # --follow with FILE behaviour depends on revs...
    startrev = revs[0]
    followdescendants = (len(revs) > 1 and revs[0] < revs[1]) and 1 or 0

    # branch and only_branch are really aliases and must be handled at
    # the same time
    opts['branch'] = opts.get('branch', []) + opts.get('only_branch', [])
    opts['branch'] = [repo.lookupbranch(b) for b in opts['branch']]
    # 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:', 'd:relpath']
        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['_matchfiles'] = matchargs
    else:
        if follow:
            fpats = ('_patsfollow', '_patsfollowfirst')
            fnopats = (('_ancestors', '_fancestors'),
                       ('_descendants', '_fdescendants'))
            if pats:
                # follow() revset inteprets its file argument as a
                # manifest entry, so use match.files(), not pats.
                opts[fpats[followfirst]] = list(match.files())
            else:
                opts[fnopats[followdescendants][followfirst]] = str(startrev)
        else:
            opts['_patslog'] = list(pats)

    filematcher = None
    if opts.get('patch') or opts.get('stat'):
        if follow:
            filematcher = _makefilematcher(repo, pats, followfirst)
        else:
            filematcher = lambda rev: match

    expr = []
    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:
            expr.append(revop)
        else:
            if not isinstance(val, list):
                e = revop % {'val': val}
            else:
                e = '(' + andor.join((revop % {'val': v}) for v in val) + ')'
            expr.append(e)

    if expr:
        expr = '(' + ' and '.join(expr) + ')'
    else:
        expr = None
    return expr, filematcher

def getlogrevs(repo, pats, opts):
    """Return (revs, expr, filematcher) where revs is an iterable of
    revision numbers, expr is a revset string built from log options
    and file patterns or None, and used to filter 'revs'. If --stat or
    --patch are not passed filematcher is None. Otherwise it is a
    callable taking a revision number and returning a match objects
    filtering the files to be detailed when displaying the revision.
    """
    def increasingrevs(repo, revs, matcher):
        # The sorted input rev sequence is chopped in sub-sequences
        # which are sorted in ascending order and passed to the
        # matcher. The filtered revs are sorted again as they were in
        # the original sub-sequence. This achieve several things:
        #
        # - getlogrevs() now returns a generator which behaviour is
        #   adapted to log need. First results come fast, last ones
        #   are batched for performances.
        #
        # - revset matchers often operate faster on revision in
        #   changelog order, because most filters deal with the
        #   changelog.
        #
        # - revset matchers can reorder revisions. "A or B" typically
        #   returns returns the revision matching A then the revision
        #   matching B. We want to hide this internal implementation
        #   detail from the caller, and sorting the filtered revision
        #   again achieves this.
        for i, window in cmdutil.increasingwindows(0, len(revs), windowsize=1):
            orevs = revs[i:i + window]
            nrevs = set(matcher(repo, sorted(orevs)))
            for rev in orevs:
                if rev in nrevs:
                    yield rev

    if not len(repo):
        return iter([]), None, None
    # Default --rev value depends on --follow but --follow behaviour
    # depends on revisions resolved from --rev...
    follow = opts.get('follow') or opts.get('follow_first')
    if opts.get('rev'):
        revs = scmutil.revrange(repo, opts['rev'])
    else:
        if follow and len(repo) > 0:
            revs = scmutil.revrange(repo, ['.:0'])
        else:
            revs = range(len(repo) - 1, -1, -1)
    if not revs:
        return iter([]), None, None
    expr, filematcher = _makelogrevset(repo, pats, opts, revs)
    if expr:
        matcher = revset.match(repo.ui, expr)
        revs = increasingrevs(repo, revs, matcher)
    if not opts.get('hidden'):
        # --hidden is still experimental and not worth a dedicated revset
        # yet. Fortunately, filtering revision number is fast.
        revs = (r for r in revs if r not in repo.changelog.hiddenrevs)
    else:
        revs = iter(revs)
    return revs, expr, filematcher

def generate(ui, dag, displayer, showparents, edgefn, getrenamed=None,
             filematcher=None):
    seen, state = [], graphmod.asciistate()
    for rev, type, ctx, parents in dag:
        char = 'o'
        if ctx.node() in showparents:
            char = '@'
        elif ctx.obsolete():
            char = 'x'
        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]))
        revmatchfn = None
        if filematcher is not None:
            revmatchfn = filematcher(ctx.rev())
        displayer.show(ctx, copies=copies, matchfn=revmatchfn)
        lines = displayer.hunk.pop(rev).split('\n')
        if not lines[-1]:
            del lines[-1]
        displayer.flush(rev)
        edges = edgefn(type, char, lines, seen, rev, parents)
        for type, char, lines, coldata in edges:
            graphmod.ascii(ui, state, type, char, lines, coldata)
    displayer.close()

@command('glog',
    [('f', 'follow', None,
     _('follow changeset history, or file history across copies and renames')),
    ('', 'follow-first', None,
     _('only follow the first parent of merge changesets (DEPRECATED)')),
    ('d', 'date', '', _('show revisions matching date spec'), _('DATE')),
    ('C', 'copies', None, _('show copied files')),
    ('k', 'keyword', [],
     _('do case-insensitive search for a given text'), _('TEXT')),
    ('r', 'rev', [], _('show the specified revision or range'), _('REV')),
    ('', 'removed', None, _('include revisions where files were removed')),
    ('m', 'only-merges', None, _('show only merges (DEPRECATED)')),
    ('u', 'user', [], _('revisions committed by user'), _('USER')),
    ('', 'only-branch', [],
     _('show only changesets within the given named branch (DEPRECATED)'),
     _('BRANCH')),
    ('b', 'branch', [],
     _('show changesets within the given named branch'), _('BRANCH')),
    ('P', 'prune', [],
     _('do not display revision or any of its ancestors'), _('REV')),
    ('', 'hidden', False, _('show hidden changesets (DEPRECATED)')),
    ] + commands.logopts + commands.walkopts,
    _('[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.
    """

    revs, expr, filematcher = getlogrevs(repo, pats, opts)
    revs = sorted(revs, 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, graphmod.asciiedges,
             getrenamed, filematcher)

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.
    """

    _checkunsupportedflags([], 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, graphmod.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

    _checkunsupportedflags([], 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, graphmod.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")))