234 lines
7.3 KiB
Python
234 lines
7.3 KiB
Python
# copies.py - copy detection for Mercurial
|
|
#
|
|
# Copyright 2008 Matt Mackall <mpm@selenic.com>
|
|
#
|
|
# This software may be used and distributed according to the terms of the
|
|
# GNU General Public License version 2, incorporated herein by reference.
|
|
|
|
from i18n import _
|
|
import util
|
|
import heapq
|
|
|
|
def _nonoverlap(d1, d2, d3):
|
|
"Return list of elements in d1 not in d2 or d3"
|
|
return sorted([d for d in d1 if d not in d3 and d not in d2])
|
|
|
|
def _dirname(f):
|
|
s = f.rfind("/")
|
|
if s == -1:
|
|
return ""
|
|
return f[:s]
|
|
|
|
def _dirs(files):
|
|
d = set()
|
|
for f in files:
|
|
f = _dirname(f)
|
|
while f not in d:
|
|
d.add(f)
|
|
f = _dirname(f)
|
|
return d
|
|
|
|
def _findoldnames(fctx, limit):
|
|
"find files that path was copied from, back to linkrev limit"
|
|
old = {}
|
|
seen = set()
|
|
orig = fctx.path()
|
|
visit = [(fctx, 0)]
|
|
while visit:
|
|
fc, depth = visit.pop()
|
|
s = str(fc)
|
|
if s in seen:
|
|
continue
|
|
seen.add(s)
|
|
if fc.path() != orig and fc.path() not in old:
|
|
old[fc.path()] = (depth, fc.path()) # remember depth
|
|
if fc.rev() is not None and fc.rev() < limit:
|
|
continue
|
|
visit += [(p, depth - 1) for p in fc.parents()]
|
|
|
|
# return old names sorted by depth
|
|
return [o[1] for o in sorted(old.values())]
|
|
|
|
def _findlimit(repo, a, b):
|
|
"find the earliest revision that's an ancestor of a or b but not both"
|
|
# basic idea:
|
|
# - mark a and b with different sides
|
|
# - if a parent's children are all on the same side, the parent is
|
|
# on that side, otherwise it is on no side
|
|
# - walk the graph in topological order with the help of a heap;
|
|
# - add unseen parents to side map
|
|
# - clear side of any parent that has children on different sides
|
|
# - track number of interesting revs that might still be on a side
|
|
# - track the lowest interesting rev seen
|
|
# - quit when interesting revs is zero
|
|
|
|
cl = repo.changelog
|
|
working = len(cl) # pseudo rev for the working directory
|
|
if a is None:
|
|
a = working
|
|
if b is None:
|
|
b = working
|
|
|
|
side = {a: -1, b: 1}
|
|
visit = [-a, -b]
|
|
heapq.heapify(visit)
|
|
interesting = len(visit)
|
|
limit = working
|
|
|
|
while interesting:
|
|
r = -heapq.heappop(visit)
|
|
if r == working:
|
|
parents = [cl.rev(p) for p in repo.dirstate.parents()]
|
|
else:
|
|
parents = cl.parentrevs(r)
|
|
for p in parents:
|
|
if p not in side:
|
|
# first time we see p; add it to visit
|
|
side[p] = side[r]
|
|
if side[p]:
|
|
interesting += 1
|
|
heapq.heappush(visit, -p)
|
|
elif side[p] and side[p] != side[r]:
|
|
# p was interesting but now we know better
|
|
side[p] = 0
|
|
interesting -= 1
|
|
if side[r]:
|
|
limit = r # lowest rev visited
|
|
interesting -= 1
|
|
return limit
|
|
|
|
def copies(repo, c1, c2, ca, checkdirs=False):
|
|
"""
|
|
Find moves and copies between context c1 and c2
|
|
"""
|
|
# avoid silly behavior for update from empty dir
|
|
if not c1 or not c2 or c1 == c2:
|
|
return {}, {}
|
|
|
|
# avoid silly behavior for parent -> working dir
|
|
if c2.node() is None and c1.node() == repo.dirstate.parents()[0]:
|
|
return repo.dirstate.copies(), {}
|
|
|
|
limit = _findlimit(repo, c1.rev(), c2.rev())
|
|
m1 = c1.manifest()
|
|
m2 = c2.manifest()
|
|
ma = ca.manifest()
|
|
|
|
def makectx(f, n):
|
|
if len(n) != 20: # in a working context?
|
|
if c1.rev() is None:
|
|
return c1.filectx(f)
|
|
return c2.filectx(f)
|
|
return repo.filectx(f, fileid=n)
|
|
|
|
ctx = util.lrucachefunc(makectx)
|
|
copy = {}
|
|
fullcopy = {}
|
|
diverge = {}
|
|
|
|
def checkcopies(f, m1, m2):
|
|
'''check possible copies of f from m1 to m2'''
|
|
c1 = ctx(f, m1[f])
|
|
for of in _findoldnames(c1, limit):
|
|
fullcopy[f] = of # remember for dir rename detection
|
|
if of in m2: # original file not in other manifest?
|
|
# if the original file is unchanged on the other branch,
|
|
# no merge needed
|
|
if m2[of] != ma.get(of):
|
|
c2 = ctx(of, m2[of])
|
|
ca = c1.ancestor(c2)
|
|
# related and named changed on only one side?
|
|
if ca and (ca.path() == f or ca.path() == c2.path()):
|
|
if c1 != ca or c2 != ca: # merge needed?
|
|
copy[f] = of
|
|
elif of in ma:
|
|
diverge.setdefault(of, []).append(f)
|
|
|
|
repo.ui.debug(_(" searching for copies back to rev %d\n") % limit)
|
|
|
|
u1 = _nonoverlap(m1, m2, ma)
|
|
u2 = _nonoverlap(m2, m1, ma)
|
|
|
|
if u1:
|
|
repo.ui.debug(_(" unmatched files in local:\n %s\n")
|
|
% "\n ".join(u1))
|
|
if u2:
|
|
repo.ui.debug(_(" unmatched files in other:\n %s\n")
|
|
% "\n ".join(u2))
|
|
|
|
for f in u1:
|
|
checkcopies(f, m1, m2)
|
|
for f in u2:
|
|
checkcopies(f, m2, m1)
|
|
|
|
diverge2 = set()
|
|
for of, fl in diverge.items():
|
|
if len(fl) == 1:
|
|
del diverge[of] # not actually divergent
|
|
else:
|
|
diverge2.update(fl) # reverse map for below
|
|
|
|
if fullcopy:
|
|
repo.ui.debug(_(" all copies found (* = to merge, ! = divergent):\n"))
|
|
for f in fullcopy:
|
|
note = ""
|
|
if f in copy: note += "*"
|
|
if f in diverge2: note += "!"
|
|
repo.ui.debug(" %s -> %s %s\n" % (f, fullcopy[f], note))
|
|
del diverge2
|
|
|
|
if not fullcopy or not checkdirs:
|
|
return copy, diverge
|
|
|
|
repo.ui.debug(_(" checking for directory renames\n"))
|
|
|
|
# generate a directory move map
|
|
d1, d2 = _dirs(m1), _dirs(m2)
|
|
invalid = set()
|
|
dirmove = {}
|
|
|
|
# examine each file copy for a potential directory move, which is
|
|
# when all the files in a directory are moved to a new directory
|
|
for dst, src in fullcopy.iteritems():
|
|
dsrc, ddst = _dirname(src), _dirname(dst)
|
|
if dsrc in invalid:
|
|
# already seen to be uninteresting
|
|
continue
|
|
elif dsrc in d1 and ddst in d1:
|
|
# directory wasn't entirely moved locally
|
|
invalid.add(dsrc)
|
|
elif dsrc in d2 and ddst in d2:
|
|
# directory wasn't entirely moved remotely
|
|
invalid.add(dsrc)
|
|
elif dsrc in dirmove and dirmove[dsrc] != ddst:
|
|
# files from the same directory moved to two different places
|
|
invalid.add(dsrc)
|
|
else:
|
|
# looks good so far
|
|
dirmove[dsrc + "/"] = ddst + "/"
|
|
|
|
for i in invalid:
|
|
if i in dirmove:
|
|
del dirmove[i]
|
|
del d1, d2, invalid
|
|
|
|
if not dirmove:
|
|
return copy, diverge
|
|
|
|
for d in dirmove:
|
|
repo.ui.debug(_(" dir %s -> %s\n") % (d, dirmove[d]))
|
|
|
|
# check unaccounted nonoverlapping files against directory moves
|
|
for f in u1 + u2:
|
|
if f not in fullcopy:
|
|
for d in dirmove:
|
|
if f.startswith(d):
|
|
# new file added in a directory that was moved, move it
|
|
df = dirmove[d] + f[len(d):]
|
|
if df not in copy:
|
|
copy[f] = df
|
|
repo.ui.debug(_(" file %s -> %s\n") % (f, copy[f]))
|
|
break
|
|
|
|
return copy, diverge
|