# convcmd - convert extension commands definition

#

# Copyright 2005-2007 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 common import NoRepo, MissingTool, SKIPREV, mapfile

from cvs import convert_cvs

from darcs import darcs_source

from git import convert_git

from hg import mercurial_source, mercurial_sink

from subversion import svn_source, svn_sink

from monotone import monotone_source

from gnuarch import gnuarch_source

from bzr import bzr_source

from p4 import p4_source

import filemap

import os, shutil, shlex

from mercurial import hg, util, encoding

from mercurial.i18n import _

orig_encoding = 'ascii'

def recode(s):

    if isinstance(s, unicode):

        return s.encode(orig_encoding, 'replace')

    else:

        return s.decode('utf-8').encode(orig_encoding, 'replace')

source_converters = [

    ('cvs', convert_cvs, 'branchsort'),

    ('git', convert_git, 'branchsort'),

    ('svn', svn_source, 'branchsort'),

    ('hg', mercurial_source, 'sourcesort'),

    ('darcs', darcs_source, 'branchsort'),

    ('mtn', monotone_source, 'branchsort'),

    ('gnuarch', gnuarch_source, 'branchsort'),

    ('bzr', bzr_source, 'branchsort'),

    ('p4', p4_source, 'branchsort'),

    ]

sink_converters = [

    ('hg', mercurial_sink),

    ('svn', svn_sink),

    ]

def convertsource(ui, path, type, rev):

    exceptions = []

    if type and type not in [s[0] for s in source_converters]:

        raise util.Abort(_('%s: invalid source repository type') % type)

    for name, source, sortmode in source_converters:

        try:

            if not type or name == type:

                return source(ui, path, rev), sortmode

        except (NoRepo, MissingTool), inst:

            exceptions.append(inst)

    if not ui.quiet:

        for inst in exceptions:

            ui.write("%s\n" % inst)

    raise util.Abort(_('%s: missing or unsupported repository') % path)

def convertsink(ui, path, type):

    if type and type not in [s[0] for s in sink_converters]:

        raise util.Abort(_('%s: invalid destination repository type') % type)

    for name, sink in sink_converters:

        try:

            if not type or name == type:

                return sink(ui, path)

        except NoRepo, inst:

            ui.note(_("convert: %s\n") % inst)

        except MissingTool, inst:

            raise util.Abort('%s\n' % inst)

    raise util.Abort(_('%s: unknown repository type') % path)

class progresssource(object):

    def __init__(self, ui, source, filecount):

        self.ui = ui

        self.source = source

        self.filecount = filecount

        self.retrieved = 0

    def getfile(self, file, rev):

        self.retrieved += 1

        self.ui.progress(_('getting files'), self.retrieved,

                         item=file, total=self.filecount)

        return self.source.getfile(file, rev)

    def lookuprev(self, rev):

        return self.source.lookuprev(rev)

    def close(self):

        self.ui.progress(_('getting files'), None)

class converter(object):

    def __init__(self, ui, source, dest, revmapfile, opts):

        self.source = source

        self.dest = dest

        self.ui = ui

        self.opts = opts

        self.commitcache = {}

        self.authors = {}

        self.authorfile = None

        # Record converted revisions persistently: maps source revision

        # ID to target revision ID (both strings).  (This is how

        # incremental conversions work.)

        self.map = mapfile(ui, revmapfile)

        # Read first the dst author map if any

        authorfile = self.dest.authorfile()

        if authorfile and os.path.exists(authorfile):

            self.readauthormap(authorfile)

        # Extend/Override with new author map if necessary

        if opts.get('authormap'):

            self.readauthormap(opts.get('authormap'))

            self.authorfile = self.dest.authorfile()

        self.splicemap = self.parsesplicemap(opts.get('splicemap'))

        self.branchmap = mapfile(ui, opts.get('branchmap'))

    def parsesplicemap(self, path):

        """ check and validate the splicemap format and

            return a child/parents dictionary.

            Format checking has two parts.

            1. generic format which is same across all source types

            2. specific format checking which may be different for

               different source type.  This logic is implemented in

               checkrevformat function in source files like

               hg.py, subversion.py etc.

        """

        if not path:

            return {}

        m = {}

        try:

            fp = open(path, 'r')

            for i, line in enumerate(fp):

                line = line.splitlines()[0].rstrip()

                if not line:

                    # Ignore blank lines

                    continue

                # split line

                lex = shlex.shlex(line, posix=True)

                lex.whitespace_split = True

                lex.whitespace += ','

                line = list(lex)

                # check number of parents

                if not (2 <= len(line) <= 3):

                    raise util.Abort(_('syntax error in %s(%d): child parent1'

                                       '[,parent2] expected') % (path, i + 1))

                for part in line:

                    self.source.checkrevformat(part)

                child, p1, p2 = line[0], line[1:2], line[2:]

                if p1 == p2:

                    m[child] = p1

                else:

                    m[child] = p1 + p2

         # if file does not exist or error reading, exit

        except IOError:

            raise util.Abort(_('splicemap file not found or error reading %s:')

                               % path)

        return m

    def walktree(self, heads):

        '''Return a mapping that identifies the uncommitted parents of every

        uncommitted changeset.'''

        visit = heads

        known = set()

        parents = {}

        while visit:

            n = visit.pop(0)

            if n in known or n in self.map:

                continue

            known.add(n)

            self.ui.progress(_('scanning'), len(known), unit=_('revisions'))

            commit = self.cachecommit(n)

            parents[n] = []

            for p in commit.parents:

                parents[n].append(p)

                visit.append(p)

        self.ui.progress(_('scanning'), None)

        return parents

    def mergesplicemap(self, parents, splicemap):

        """A splicemap redefines child/parent relationships. Check the

        map contains valid revision identifiers and merge the new

        links in the source graph.

        """

        for c in sorted(splicemap):

            if c not in parents:

                    # Could be in source but not converted during this run

                    self.ui.warn(_('splice map revision %s is not being '

                                   'converted, ignoring\n') % c)

                continue

            pc = []

            for p in splicemap[c]:

                # We do not have to wait for nodes already in dest.

                    continue

                # Parent is not in dest and not being converted, not good

                if p not in parents:

                    raise util.Abort(_('unknown splice map parent: %s') % p)

                pc.append(p)

            parents[c] = pc

    def toposort(self, parents, sortmode):

        '''Return an ordering such that every uncommitted changeset is

        preceded by all its uncommitted ancestors.'''

        def mapchildren(parents):

            """Return a (children, roots) tuple where 'children' maps parent

            revision identifiers to children ones, and 'roots' is the list of

            revisions without parents. 'parents' must be a mapping of revision

            identifier to its parents ones.

            """

            visit = sorted(parents)

            seen = set()

            children = {}

            roots = []

            while visit:

                n = visit.pop(0)

                if n in seen:

                    continue

                seen.add(n)

                # Ensure that nodes without parents are present in the

                # 'children' mapping.

                children.setdefault(n, [])

                hasparent = False

                for p in parents[n]:

                    if p not in self.map:

                        visit.append(p)

                        hasparent = True

                    children.setdefault(p, []).append(n)

                if not hasparent:

                    roots.append(n)

            return children, roots

        # Sort functions are supposed to take a list of revisions which

        # can be converted immediately and pick one

        def makebranchsorter():

            """If the previously converted revision has a child in the

            eligible revisions list, pick it. Return the list head

            otherwise. Branch sort attempts to minimize branch

            switching, which is harmful for Mercurial backend

            compression.

            """

            prev = [None]

            def picknext(nodes):

                next = nodes[0]

                for n in nodes:

                    if prev[0] in parents[n]:

                        next = n

                        break

                prev[0] = next

                return next

            return picknext

        def makesourcesorter():

            """Source specific sort."""

            keyfn = lambda n: self.commitcache[n].sortkey

            def picknext(nodes):

                return sorted(nodes, key=keyfn)[0]

            return picknext

        def makeclosesorter():

            """Close order sort."""

            keyfn = lambda n: ('close' not in self.commitcache[n].extra,

                               self.commitcache[n].sortkey)

            def picknext(nodes):

                return sorted(nodes, key=keyfn)[0]

            return picknext

        def makedatesorter():

            """Sort revisions by date."""

            dates = {}

            def getdate(n):

                if n not in dates:

                    dates[n] = util.parsedate(self.commitcache[n].date)

                return dates[n]

            def picknext(nodes):

                return min([(getdate(n), n) for n in nodes])[1]

            return picknext

        if sortmode == 'branchsort':

            picknext = makebranchsorter()

        elif sortmode == 'datesort':

            picknext = makedatesorter()

        elif sortmode == 'sourcesort':

            picknext = makesourcesorter()

        elif sortmode == 'closesort':

            picknext = makeclosesorter()

        else:

            raise util.Abort(_('unknown sort mode: %s') % sortmode)

        children, actives = mapchildren(parents)

        s = []

        pendings = {}

        while actives:

            n = picknext(actives)

            actives.remove(n)

            s.append(n)

            # Update dependents list

            for c in children.get(n, []):

                if c not in pendings:

                    pendings[c] = [p for p in parents[c] if p not in self.map]

                try:

                    pendings[c].remove(n)

                except ValueError:

                    raise util.Abort(_('cycle detected between %s and %s')

                                       % (recode(c), recode(n)))

                if not pendings[c]:

                    # Parents are converted, node is eligible

                    actives.insert(0, c)

                    pendings[c] = None

        if len(s) != len(parents):

            raise util.Abort(_("not all revisions were sorted"))

        return s

    def writeauthormap(self):

        authorfile = self.authorfile

        if authorfile:

            self.ui.status(_('writing author map file %s\n') % authorfile)

            ofile = open(authorfile, 'w+')

            for author in self.authors:

                ofile.write("%s=%s\n" % (author, self.authors[author]))

            ofile.close()

    def readauthormap(self, authorfile):

        afile = open(authorfile, 'r')

        for line in afile:

            line = line.strip()

            if not line or line.startswith('#'):

                continue

            try:

                srcauthor, dstauthor = line.split('=', 1)

            except ValueError:

                msg = _('ignoring bad line in author map file %s: %s\n')

                self.ui.warn(msg % (authorfile, line.rstrip()))

                continue

            srcauthor = srcauthor.strip()

            dstauthor = dstauthor.strip()

            if self.authors.get(srcauthor) in (None, dstauthor):

                msg = _('mapping author %s to %s\n')

                self.ui.debug(msg % (srcauthor, dstauthor))

                self.authors[srcauthor] = dstauthor

                continue

            m = _('overriding mapping for author %s, was %s, will be %s\n')

            self.ui.status(m % (srcauthor, self.authors[srcauthor], dstauthor))