# debugcommands.py - command processing for debug* commands

#

# Copyright 2005-2016 Matt Mackall <mpm@selenic.com>

#

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

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

from __future__ import absolute_import

import os

from .i18n import _

from .node import (

    hex,

)

from . import (

    cmdutil,

    commands,

    context,

    dagparser,

    error,

    lock as lockmod,

    revlog,

    scmutil,

    simplemerge,

)

release = lockmod.release

# We reuse the command table from commands because it is easier than

# teaching dispatch about multiple tables.

command = cmdutil.command(commands.table)

@command('debugancestor', [], _('[INDEX] REV1 REV2'), optionalrepo=True)

def debugancestor(ui, repo, *args):

    """find the ancestor revision of two revisions in a given index"""

    if len(args) == 3:

        index, rev1, rev2 = args

        r = revlog.revlog(scmutil.opener(os.getcwd(), audit=False), index)

        lookup = r.lookup

    elif len(args) == 2:

        if not repo:

            raise error.Abort(_('there is no Mercurial repository here '

                                '(.hg not found)'))

        rev1, rev2 = args

        r = repo.changelog

        lookup = repo.lookup

    else:

        raise error.Abort(_('either two or three arguments required'))

    a = r.ancestor(lookup(rev1), lookup(rev2))

    ui.write('%d:%s\n' % (r.rev(a), hex(a)))

@command('debugbuilddag',

    [('m', 'mergeable-file', None, _('add single file mergeable changes')),

    ('o', 'overwritten-file', None, _('add single file all revs overwrite')),

    ('n', 'new-file', None, _('add new file at each rev'))],

    _('[OPTION]... [TEXT]'))

def debugbuilddag(ui, repo, text=None,

                  mergeable_file=False,

                  overwritten_file=False,

                  new_file=False):

    """builds a repo with a given DAG from scratch in the current empty repo

    The description of the DAG is read from stdin if not given on the

    command line.

    Elements:

     - "+n" is a linear run of n nodes based on the current default parent

     - "." is a single node based on the current default parent

     - "$" resets the default parent to null (implied at the start);

           otherwise the default parent is always the last node created

     - "<p" sets the default parent to the backref p

     - "*p" is a fork at parent p, which is a backref

     - "*p1/p2" is a merge of parents p1 and p2, which are backrefs

     - "/p2" is a merge of the preceding node and p2

     - ":tag" defines a local tag for the preceding node

     - "@branch" sets the named branch for subsequent nodes

     - "#...\\n" is a comment up to the end of the line

    Whitespace between the above elements is ignored.

    A backref is either

     - a number n, which references the node curr-n, where curr is the current

       node, or

     - the name of a local tag you placed earlier using ":tag", or

     - empty to denote the default parent.

    All string valued-elements are either strictly alphanumeric, or must

    be enclosed in double quotes ("..."), with "\\" as escape character.

    """

    if text is None:

        ui.status(_("reading DAG from stdin\n"))

        text = ui.fin.read()

    cl = repo.changelog

    if len(cl) > 0:

        raise error.Abort(_('repository is not empty'))

    # determine number of revs in DAG

    total = 0

    for type, data in dagparser.parsedag(text):

        if type == 'n':

            total += 1

    if mergeable_file:

        linesperrev = 2

        # make a file with k lines per rev

        initialmergedlines = [str(i) for i in xrange(0, total * linesperrev)]

        initialmergedlines.append("")

    tags = []

    wlock = lock = tr = None

    try:

        wlock = repo.wlock()

        lock = repo.lock()

        tr = repo.transaction("builddag")

        at = -1

        atbranch = 'default'

        nodeids = []

        id = 0

        ui.progress(_('building'), id, unit=_('revisions'), total=total)

        for type, data in dagparser.parsedag(text):

            if type == 'n':

                ui.note(('node %s\n' % str(data)))

                id, ps = data

                files = []

                fctxs = {}

                p2 = None

                if mergeable_file:

                    fn = "mf"

                    p1 = repo[ps[0]]

                    if len(ps) > 1:

                        p2 = repo[ps[1]]

                        pa = p1.ancestor(p2)

                        base, local, other = [x[fn].data() for x in (pa, p1,

                                                                     p2)]

                        m3 = simplemerge.Merge3Text(base, local, other)

                        ml = [l.strip() for l in m3.merge_lines()]

                        ml.append("")

                    elif at > 0:

                        ml = p1[fn].data().split("\n")

                    else:

                        ml = initialmergedlines

                    ml[id * linesperrev] += " r%i" % id

                    mergedtext = "\n".join(ml)

                    files.append(fn)

                    fctxs[fn] = context.memfilectx(repo, fn, mergedtext)

                if overwritten_file:

                    fn = "of"

                    files.append(fn)

                    fctxs[fn] = context.memfilectx(repo, fn, "r%i\n" % id)

                if new_file:

                    fn = "nf%i" % id

                    files.append(fn)

                    fctxs[fn] = context.memfilectx(repo, fn, "r%i\n" % id)

                    if len(ps) > 1:

                        if not p2:

                            p2 = repo[ps[1]]

                        for fn in p2:

                            if fn.startswith("nf"):

                                files.append(fn)

                                fctxs[fn] = p2[fn]

                def fctxfn(repo, cx, path):

                    return fctxs.get(path)

                if len(ps) == 0 or ps[0] < 0:

                    pars = [None, None]

                elif len(ps) == 1:

                    pars = [nodeids[ps[0]], None]

                else:

                    pars = [nodeids[p] for p in ps]

                cx = context.memctx(repo, pars, "r%i" % id, files, fctxfn,

                                    date=(id, 0),

                                    user="debugbuilddag",

                                    extra={'branch': atbranch})

                nodeid = repo.commitctx(cx)

                nodeids.append(nodeid)

                at = id

            elif type == 'l':

                id, name = data

                ui.note(('tag %s\n' % name))

                tags.append("%s %s\n" % (hex(repo.changelog.node(id)), name))

            elif type == 'a':

                ui.note(('branch %s\n' % data))

                atbranch = data

            ui.progress(_('building'), id, unit=_('revisions'), total=total)

        tr.close()

        if tags:

            repo.vfs.write("localtags", "".join(tags))

    finally:

        ui.progress(_('building'), None)

        release(tr, lock, wlock)