#

# Perforce source for convert extension.

#

# Copyright 2009, Frank Kingswood <frank@kingswood-consulting.co.uk>

#

#

from mercurial import util

from mercurial.i18n import _

from common import commit, converter_source, checktool, NoRepo

import marshal

def loaditer(f):

    "Yield the dictionary objects generated by p4"

    try:

        while True:

            d = marshal.load(f)

            if not d:

                break

            yield d

    except EOFError:

        pass

class p4_source(converter_source):

    def __init__(self, ui, path, rev=None):

        super(p4_source, self).__init__(ui, path, rev=rev)

        if not path.startswith('//'):

            raise NoRepo('%s does not look like a P4 repo' % path)

        checktool('p4', abort=False)

        self.p4changes = {}

        self.heads = {}

        self.changeset = {}

        self.files = {}

        self.tags = {}

        self.lastbranch = {}

        self.parent = {}

        self.encoding = "latin_1"

        self.depotname = {}           # mapping from local name to depot name

        self.modecache = {}

        self._parse(ui, path)

    def _parse_view(self, path):

        "Read changes affecting the path"

        cmd = 'p4 -G changes -s submitted "%s"' % path

        stdout = util.popen(cmd)

        for d in loaditer(stdout):

            c = d.get("change", None)

            if c:

                self.p4changes[c] = True

    def _parse(self, ui, path):

        "Prepare list of P4 filenames and revisions to import"

        ui.status(_('reading p4 views\n'))

        # read client spec or view

        if "/" in path:

            self._parse_view(path)

            if path.startswith("//") and path.endswith("/..."):

                views = {path[:-3]:""}

            else:

                views = {"//": ""}

        else:

            cmd = 'p4 -G client -o "%s"' % path

            clientspec = marshal.load(util.popen(cmd))

            views = {}

            for client in clientspec:

                if client.startswith("View"):

                    sview, cview = clientspec[client].split()

                    self._parse_view(sview)

                    if sview.endswith("...") and cview.endswith("..."):

                        sview = sview[:-3]

                        cview = cview[:-3]

                    cview = cview[2:]

                    cview = cview[cview.find("/") + 1:]

                    views[sview] = cview

        # list of changes that affect our source files

        self.p4changes = self.p4changes.keys()

        self.p4changes.sort(key=int)

        # list with depot pathnames, longest first

        vieworder = views.keys()

        vieworder.sort(key=lambda x: -len(x))

        # handle revision limiting

        startrev = self.ui.config('convert', 'p4.startrev', default=0)

        self.p4changes = [x for x in self.p4changes

                          if ((not startrev or int(x) >= int(startrev)) and

                              (not self.rev or int(x) <= int(self.rev)))]

        # now read the full changelists to get the list of file revisions

        ui.status(_('collecting p4 changelists\n'))

        lastid = None

        for change in self.p4changes:

            cmd = "p4 -G describe %s" % change

            stdout = util.popen(cmd)

            d = marshal.load(stdout)

            desc = self.recode(d["desc"])

            shortdesc = desc.split("\n", 1)[0]

            t = '%s %s' % (d["change"], repr(shortdesc)[1:-1])

            ui.status(util.ellipsis(t, 80) + '\n')

            if lastid:

                parents = [lastid]

            else:

                parents = []

            date = (int(d["time"]), 0)     # timezone not set

            c = commit(author=self.recode(d["user"]), date=util.datestr(date),

                        parents=parents, desc=desc, branch='', extra={"p4": change})

            files = []

            i = 0

            while ("depotFile%d" % i) in d and ("rev%d" % i) in d:

                oldname = d["depotFile%d" % i]

                filename = None

                for v in vieworder:

                    if oldname.startswith(v):

                        filename = views[v] + oldname[len(v):]

                        break

                if filename:

                    files.append((filename, d["rev%d" % i]))

                    self.depotname[filename] = oldname

                i += 1

            self.changeset[change] = c

            self.files[change] = files

            lastid = change

        if lastid:

            self.heads = [lastid]

    def getheads(self):

        return self.heads

    def getfile(self, name, rev):

        cmd = 'p4 -G print "%s#%s"' % (self.depotname[name], rev)

        stdout = util.popen(cmd)

        mode = None

        data = ""

        for d in loaditer(stdout):

            if d["code"] == "stat":

                if "+x" in d["type"]:

                    mode = "x"

                else:

                    mode = ""

            elif d["code"] == "text":

                data += d["data"]

        if mode is None:

            raise IOError()

        self.modecache[(name, rev)] = mode

        return data

    def getmode(self, name, rev):

        return self.modecache[(name, rev)]

    def getchanges(self, rev):

        return self.files[rev], {}

    def getcommit(self, rev):

        return self.changeset[rev]

    def gettags(self):

        return self.tags

    def getchangedfiles(self, rev, i):

        return sorted([x[0] for x in self.files[rev]])