# changelog.py - changelog class for mercurial

#

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

#

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

# of the GNU General Public License, incorporated herein by reference.

from revlog import *

from demandload import demandload

demandload(globals(), "os time util")

class changelog(revlog):

    def __init__(self, opener):

        revlog.__init__(self, opener, "00changelog.i", "00changelog.d")

    def extract(self, text):

        if not text:

            return (nullid, "", (0, 0), [], "")

        last = text.index("\n\n")

        desc = text[last + 2:]

        l = text[:last].splitlines()

        manifest = bin(l[0])

        user = l[1]

        date = l[2].split(' ')

        time = float(date.pop(0))

        try:

            # various tools did silly things with the time zone field.

            timezone = int(date[0])

        except:

            timezone = 0

        files = l[3:]

        return (manifest, user, (time, timezone), files, desc)

    def read(self, node):

        return self.extract(self.revision(node))

    def add(self, manifest, list, desc, transaction, p1=None, p2=None,

                  user=None, date=None):

        if date:

            # validate explicit (probably user-specified) date and

            # time zone offset. values must fit in signed 32 bits for

            # current 32-bit linux runtimes.

            try:

                when, offset = map(int, date.split(' '))

            except ValueError:

                raise ValueError('invalid date: %r' % date)

            if abs(when) > 0x7fffffff:

                raise ValueError('date exceeds 32 bits: %d' % when)

            if abs(offset) >= 43200:

                raise ValueError('impossible time zone offset: %d' % offset)

        else:

            date = "%d %d" % util.makedate()

        list.sort()

        l = [hex(manifest), user, date] + list + ["", desc]

        text = "\n".join(l)

        return self.addrevision(text, transaction, self.count(), p1, p2)