# context.py - changeset and file context objects for mercurial
#
# Copyright 2006 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 node import *
from i18n import gettext as _
from demandload import demandload
demandload(globals(), "ancestor bdiff repo revlog util")
class changectx(object):
"""A changecontext object makes access to data related to a particular
changeset convenient."""
def __init__(self, repo, changeid=None):
"""changeid is a revision number, node, or tag"""
self._repo = repo
if not changeid and changeid != 0:
p1, p2 = self._repo.dirstate.parents()
self._rev = self._repo.changelog.rev(p1)
if self._rev == -1:
changeid = 'tip'
else:
self._node = p1
return
self._node = self._repo.lookup(changeid)
self._rev = self._repo.changelog.rev(self._node)
def __str__(self):
return short(self.node())
def __repr__(self):
return "<changectx %s>" % short(self.node())
def __eq__(self, other):
return self._rev == other._rev
def __nonzero__(self):
return self._rev != -1
def changeset(self):
try:
return self._changeset
except AttributeError:
self._changeset = self._repo.changelog.read(self.node())
return self._changeset
def manifest(self):
try:
return self._manifest
except AttributeError:
self._manifest = self._repo.manifest.read(self.changeset()[0])
return self._manifest
def rev(self): return self._rev
def node(self): return self._node
def user(self): return self.changeset()[1]
def date(self): return self.changeset()[2]
def files(self): return self.changeset()[3]
def description(self): return self.changeset()[4]
def parents(self):
"""return contexts for each parent changeset"""
p = self._repo.changelog.parents(self._node)
return [ changectx(self._repo, x) for x in p ]
def children(self):
"""return contexts for each child changeset"""
c = self._repo.changelog.children(self._node)
return [ changectx(self._repo, x) for x in c ]
def filenode(self, path):
node, flag = self._repo.manifest.find(self.changeset()[0], path)
return node
def filectx(self, path, fileid=None):
"""get a file context from this changeset"""
if fileid is None:
fileid = self.filenode(path)
if not fileid:
raise repo.LookupError(_("'%s' does not exist in changeset %s") %
(path, hex(self.node())))
return filectx(self._repo, path, fileid=fileid)
def filectxs(self):
"""generate a file context for each file in this changeset's
manifest"""
mf = self.manifest()
m = mf.keys()
m.sort()
for f in m:
yield self.filectx(f, fileid=mf[f])
def ancestor(self, c2):
"""
return the ancestor context of self and c2
"""
n = self._repo.changelog.ancestor(self._node, c2._node)
return changectx(self._repo, n)
class filectx(object):
"""A filecontext object makes access to data related to a particular
filerevision convenient."""
def __init__(self, repo_, path, changeid=None, fileid=None, filelog=None):
"""changeid can be a changeset revision, node, or tag.
fileid can be a file revision or node."""
self._repo = repo_
self._path = path
assert changeid is not None or fileid is not None
if filelog:
self._filelog = filelog
else:
self._filelog = self._repo.file(self._path)
if fileid is None:
self._changeid = changeid
else:
try:
self._filenode = self._filelog.lookup(fileid)
except revlog.RevlogError, inst:
raise repo.LookupError(str(inst))
self._changeid = self._filelog.linkrev(self._filenode)
def __getattr__(self, name):
if name == '_changectx':
self._changectx = changectx(self._repo, self._changeid)
return self._changectx
elif name == '_filenode':
self._filenode = self._changectx.filenode(self._path)
return self._filenode
elif name == '_filerev':
self._filerev = self._filelog.rev(self._filenode)
return self._filerev
else:
raise AttributeError, name
def __nonzero__(self):
return self._filerev != nullid
def __str__(self):
return "%s@%s" % (self.path(), short(self.node()))
def __repr__(self):
return "<filectx %s@%s>" % (self.path(), short(self.node()))
def __eq__(self, other):
return self._path == other._path and self._changeid == other._changeid
def filectx(self, fileid):
'''opens an arbitrary revision of the file without
opening a new filelog'''
return filectx(self._repo, self._path, fileid=fileid,
filelog=self._filelog)
def filerev(self): return self._filerev
def filenode(self): return self._filenode
def filelog(self): return self._filelog
def rev(self):
if hasattr(self, "_changectx"):
return self._changectx.rev()
return self._filelog.linkrev(self._filenode)
def node(self): return self._changectx.node()
def user(self): return self._changectx.user()
def date(self): return self._changectx.date()
def files(self): return self._changectx.files()
def description(self): return self._changectx.description()
def manifest(self): return self._changectx.manifest()
def changectx(self): return self._changectx
def data(self): return self._filelog.read(self._filenode)
def renamed(self): return self._filelog.renamed(self._filenode)
def path(self): return self._path
def parents(self):
p = self._path
fl = self._filelog
pl = [ (p, n, fl) for n in self._filelog.parents(self._filenode) ]
r = self.renamed()
if r:
pl[0] = (r[0], r[1], None)
return [ filectx(self._repo, p, fileid=n, filelog=l)
for p,n,l in pl if n != nullid ]
def children(self):
# hard for renames
c = self._filelog.children(self._filenode)
return [ filectx(self._repo, self._path, fileid=x,
filelog=self._filelog) for x in c ]
def annotate(self, follow=False):
'''returns a list of tuples of (ctx, line) for each line
in the file, where ctx is the filectx of the node where
that line was last changed'''
def decorate(text, rev):
return ([rev] * len(text.splitlines()), text)
def pair(parent, child):
for a1, a2, b1, b2 in bdiff.blocks(parent[1], child[1]):
child[0][b1:b2] = parent[0][a1:a2]
return child
getlog = util.cachefunc(lambda x: self._repo.file(x))
def getctx(path, fileid):
log = path == self._path and self._filelog or getlog(path)
return filectx(self._repo, path, fileid=fileid, filelog=log)
getctx = util.cachefunc(getctx)
def parents(f):
# we want to reuse filectx objects as much as possible
p = f._path
pl = [ (p, f._filelog.rev(n)) for n in f._filelog.parents(f._filenode) ]
if follow:
r = f.renamed()
if r:
pl[0] = (r[0], getlog(r[0]).rev(r[1]))
return [ getctx(p, n) for p, n in pl if n != -1 ]
# find all ancestors
needed = {self: 1}
visit = [self]
files = [self._path]
while visit:
f = visit.pop(0)
for p in parents(f):
if p not in needed:
needed[p] = 1
visit.append(p)
if p._path not in files:
files.append(p._path)
else:
# count how many times we'll use this
needed[p] += 1
# sort by revision (per file) which is a topological order
visit = []
files.reverse()
for f in files:
fn = [(n._filerev, n) for n in needed.keys() if n._path == f]
fn.sort()
visit.extend(fn)
hist = {}
for r, f in visit:
curr = decorate(f.data(), f)
for p in parents(f):
if p != nullid:
curr = pair(hist[p], curr)
# trim the history of unneeded revs
needed[p] -= 1
if not needed[p]:
del hist[p]
hist[f] = curr
return zip(hist[f][0], hist[f][1].splitlines(1))
def ancestor(self, fc2):
"""
find the common ancestor file context, if any, of self, and fc2
"""
acache = {}
flcache = {self._path:self._filelog, fc2._path:fc2._filelog}
def parents(vertex):
if vertex in acache:
return acache[vertex]
f, n = vertex
if f not in flcache:
flcache[f] = self._repo.file(f)
fl = flcache[f]
pl = [ (f,p) for p in fl.parents(n) if p != nullid ]
re = fl.renamed(n)
if re:
pl.append(re)
acache[vertex]=pl
return pl
a, b = (self._path, self._filenode), (fc2._path, fc2._filenode)
v = ancestor.ancestor(a, b, parents)
if v:
f,n = v
return filectx(self._repo, f, fileid=n, filelog=flcache[f])
return None