Add revlog.strip to truncate away revisions.
This updates the revlog data structures for index and nodemap in place
so the .d and .i files don't need to be reread after stripping away a revision.
# manifest.py - manifest revision 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.
import sys, struct
from revlog import *
from i18n import gettext as _
from demandload import *
demandload(globals(), "bisect array")
class manifest(revlog):
def __init__(self, opener):
self.mapcache = None
self.listcache = None
revlog.__init__(self, opener, "00manifest.i", "00manifest.d")
def read(self, node):
if node == nullid: return {} # don't upset local cache
if self.mapcache and self.mapcache[0] == node:
return self.mapcache[1]
text = self.revision(node)
map = {}
flag = {}
self.listcache = array.array('c', text)
lines = text.splitlines(1)
for l in lines:
(f, n) = l.split('\0')
map[f] = bin(n[:40])
flag[f] = (n[40:-1] == "x")
self.mapcache = (node, map, flag)
return map
def readflags(self, node):
if node == nullid: return {} # don't upset local cache
if not self.mapcache or self.mapcache[0] != node:
self.read(node)
return self.mapcache[2]
def diff(self, a, b):
return mdiff.textdiff(str(a), str(b))
def add(self, map, flags, transaction, link, p1=None, p2=None,
changed=None):
# returns a tuple (start, end). If the string is found
# m[start:end] are the line containing that string. If start == end
# the string was not found and they indicate the proper sorted
# insertion point. This was taken from bisect_left, and modified
# to find line start/end as it goes along.
#
# m should be a buffer or a string
# s is a string
#
def manifestsearch(m, s, lo=0, hi=None):
def advance(i, c):
while i < lenm and m[i] != c:
i += 1
return i
lenm = len(m)
if not hi:
hi = lenm
while lo < hi:
mid = (lo + hi) // 2
start = mid
while start > 0 and m[start-1] != '\n':
start -= 1
end = advance(start, '\0')
if m[start:end] < s:
# we know that after the null there are 40 bytes of sha1
# this translates to the bisect lo = mid + 1
lo = advance(end + 40, '\n') + 1
else:
# this translates to the bisect hi = mid
hi = start
end = advance(lo, '\0')
found = m[lo:end]
if cmp(s, found) == 0:
# we know that after the null there are 40 bytes of sha1
end = advance(end + 40, '\n')
return (lo, end+1)
else:
return (lo, lo)
# apply the changes collected during the bisect loop to our addlist
# return a delta suitable for addrevision
def addlistdelta(addlist, x):
# start from the bottom up
# so changes to the offsets don't mess things up.
i = len(x)
while i > 0:
i -= 1
start = x[i][0]
end = x[i][1]
if x[i][2]:
addlist[start:end] = array.array('c', x[i][2])
else:
del addlist[start:end]
return "".join([struct.pack(">lll", d[0], d[1], len(d[2])) + d[2] \
for d in x ])
# if we're using the listcache, make sure it is valid and
# parented by the same node we're diffing against
if not changed or not self.listcache or not p1 or \
self.mapcache[0] != p1:
files = map.keys()
files.sort()
text = ["%s\000%s%s\n" %
(f, hex(map[f]), flags[f] and "x" or '')
for f in files]
self.listcache = array.array('c', "".join(text))
cachedelta = None
else:
addlist = self.listcache
# combine the changed lists into one list for sorting
work = [[x, 0] for x in changed[0]]
work[len(work):] = [[x, 1] for x in changed[1]]
work.sort()
delta = []
dstart = None
dend = None
dline = [""]
start = 0
# zero copy representation of addlist as a buffer
addbuf = buffer(addlist)
# start with a readonly loop that finds the offset of
# each line and creates the deltas
for w in work:
f = w[0]
# bs will either be the index of the item or the insert point
start, end = manifestsearch(addbuf, f, start)
if w[1] == 0:
l = "%s\000%s%s\n" % (f, hex(map[f]),
flags[f] and "x" or '')
else:
l = ""
if start == end and w[1] == 1:
# item we want to delete was not found, error out
raise AssertionError(
_("failed to remove %s from manifest\n") % f)
if dstart != None and dstart <= start and dend >= start:
if dend < end:
dend = end
if l:
dline.append(l)
else:
if dstart != None:
delta.append([dstart, dend, "".join(dline)])
dstart = start
dend = end
dline = [l]
if dstart != None:
delta.append([dstart, dend, "".join(dline)])
# apply the delta to the addlist, and get a delta for addrevision
cachedelta = addlistdelta(addlist, delta)
# the delta is only valid if we've been processing the tip revision
if self.mapcache[0] != self.tip():
cachedelta = None
self.listcache = addlist
n = self.addrevision(buffer(self.listcache), transaction, link, p1, \
p2, cachedelta)
self.mapcache = (n, map, flags)
return n