view mercurial/changelog.py @ 2320:dbdce3b99988

fix parsing of tags. make parse errors useful. add new tag tests.

old code read every head of .hgtags. delete and recreate of .hgtags gave
new head, but if error in deleted rev, .hgtags had error messages every
time it was parsed. this was very hard to fix, because deleted revs hard
to get back and update, needed merges too.

new code reads .hgtags on every head. advantage is if parse error
happens with new code, is possible to fix them by editing .hgtags on a
head and committing.

NOTE: new code uses binary search of manifest of each head to be fast,
but still much slower than old code. best thing would be to have delete
record stored in filelog so we never touch manifest. could find live
heads directly from filelog. this is more work than i want now.

new tests check for parse of tags on different heads, and inaccessible
heads created by delete and recreate of .hgtags.

# changelog.py - changelog class for mercurial
#
# Copyright 2005 Matt Mackall <[e-mail]>
#
# 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 i18n import gettext as _
from demandload import demandload
demandload(globals(), "os time util")

class changelog(revlog):
    def __init__(self, opener, defversion=REVLOGV0):
        revlog.__init__(self, opener, "00changelog.i", "00changelog.d",
                        defversion)

    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. timezones go from UTC-12
            # to UTC+14
            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 offset < -50400 or 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)