merge: fix --preview to show all nodes that will be merged (
issue2043).
Formerly, it omitted nodes that were not descendants of the least
common ancestor of the two merge parents, even though those nodes
contribute to the merge. The new algorithm uses revlog.findmissing()
instead of ancestor() + nodesbetween().
# filemerge.py - file-level merge handling for Mercurial
#
# Copyright 2006, 2007, 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 or any later version.
from node import short
from i18n import _
import util, simplemerge, match
import os, tempfile, re, filecmp
def _toolstr(ui, tool, part, default=""):
return ui.config("merge-tools", tool + "." + part, default)
def _toolbool(ui, tool, part, default=False):
return ui.configbool("merge-tools", tool + "." + part, default)
_internal = ['internal:' + s
for s in 'fail local other merge prompt dump'.split()]
def _findtool(ui, tool):
if tool in _internal:
return tool
k = _toolstr(ui, tool, "regkey")
if k:
p = util.lookup_reg(k, _toolstr(ui, tool, "regname"))
if p:
p = util.find_exe(p + _toolstr(ui, tool, "regappend"))
if p:
return p
return util.find_exe(_toolstr(ui, tool, "executable", tool))
def _picktool(repo, ui, path, binary, symlink):
def check(tool, pat, symlink, binary):
tmsg = tool
if pat:
tmsg += " specified for " + pat
if not _findtool(ui, tool):
if pat: # explicitly requested tool deserves a warning
ui.warn(_("couldn't find merge tool %s\n") % tmsg)
else: # configured but non-existing tools are more silent
ui.note(_("couldn't find merge tool %s\n") % tmsg)
elif symlink and not _toolbool(ui, tool, "symlink"):
ui.warn(_("tool %s can't handle symlinks\n") % tmsg)
elif binary and not _toolbool(ui, tool, "binary"):
ui.warn(_("tool %s can't handle binary\n") % tmsg)
elif not util.gui() and _toolbool(ui, tool, "gui"):
ui.warn(_("tool %s requires a GUI\n") % tmsg)
else:
return True
return False
# HGMERGE takes precedence
hgmerge = os.environ.get("HGMERGE")
if hgmerge:
return (hgmerge, hgmerge)
# then patterns
for pat, tool in ui.configitems("merge-patterns"):
mf = match.match(repo.root, '', [pat])
if mf(path) and check(tool, pat, symlink, False):
toolpath = _findtool(ui, tool)
return (tool, '"' + toolpath + '"')
# then merge tools
tools = {}
for k, v in ui.configitems("merge-tools"):
t = k.split('.')[0]
if t not in tools:
tools[t] = int(_toolstr(ui, t, "priority", "0"))
names = tools.keys()
tools = sorted([(-p, t) for t, p in tools.items()])
uimerge = ui.config("ui", "merge")
if uimerge:
if uimerge not in names:
return (uimerge, uimerge)
tools.insert(0, (None, uimerge)) # highest priority
tools.append((None, "hgmerge")) # the old default, if found
for p, t in tools:
if check(t, None, symlink, binary):
toolpath = _findtool(ui, t)
return (t, '"' + toolpath + '"')
# internal merge as last resort
return (not (symlink or binary) and "internal:merge" or None, None)
def _eoltype(data):
"Guess the EOL type of a file"
if '\0' in data: # binary
return None
if '\r\n' in data: # Windows
return '\r\n'
if '\r' in data: # Old Mac
return '\r'
if '\n' in data: # UNIX
return '\n'
return None # unknown
def _matcheol(file, origfile):
"Convert EOL markers in a file to match origfile"
tostyle = _eoltype(open(origfile, "rb").read())
if tostyle:
data = open(file, "rb").read()
style = _eoltype(data)
if style:
newdata = data.replace(style, tostyle)
if newdata != data:
open(file, "wb").write(newdata)
def filemerge(repo, mynode, orig, fcd, fco, fca):
"""perform a 3-way merge in the working directory
mynode = parent node before merge
orig = original local filename before merge
fco = other file context
fca = ancestor file context
fcd = local file context for current/destination file
"""
def temp(prefix, ctx):
pre = "%s~%s." % (os.path.basename(ctx.path()), prefix)
(fd, name) = tempfile.mkstemp(prefix=pre)
data = repo.wwritedata(ctx.path(), ctx.data())
f = os.fdopen(fd, "wb")
f.write(data)
f.close()
return name
def isbin(ctx):
try:
return util.binary(ctx.data())
except IOError:
return False
if not fco.cmp(fcd.data()): # files identical?
return None
ui = repo.ui
fd = fcd.path()
binary = isbin(fcd) or isbin(fco) or isbin(fca)
symlink = 'l' in fcd.flags() + fco.flags()
tool, toolpath = _picktool(repo, ui, fd, binary, symlink)
ui.debug("picked tool '%s' for %s (binary %s symlink %s)\n" %
(tool, fd, binary, symlink))
if not tool or tool == 'internal:prompt':
tool = "internal:local"
if ui.promptchoice(_(" no tool found to merge %s\n"
"keep (l)ocal or take (o)ther?") % fd,
(_("&Local"), _("&Other")), 0):
tool = "internal:other"
if tool == "internal:local":
return 0
if tool == "internal:other":
repo.wwrite(fd, fco.data(), fco.flags())
return 0
if tool == "internal:fail":
return 1
# do the actual merge
a = repo.wjoin(fd)
b = temp("base", fca)
c = temp("other", fco)
out = ""
back = a + ".orig"
util.copyfile(a, back)
if orig != fco.path():
ui.status(_("merging %s and %s to %s\n") % (orig, fco.path(), fd))
else:
ui.status(_("merging %s\n") % fd)
ui.debug("my %s other %s ancestor %s\n" % (fcd, fco, fca))
# do we attempt to simplemerge first?
if _toolbool(ui, tool, "premerge", not (binary or symlink)):
r = simplemerge.simplemerge(ui, a, b, c, quiet=True)
if not r:
ui.debug(" premerge successful\n")
os.unlink(back)
os.unlink(b)
os.unlink(c)
return 0
util.copyfile(back, a) # restore from backup and try again
env = dict(HG_FILE=fd,
HG_MY_NODE=short(mynode),
HG_OTHER_NODE=str(fco.changectx()),
HG_BASE_NODE=str(fca.changectx()),
HG_MY_ISLINK='l' in fcd.flags(),
HG_OTHER_ISLINK='l' in fco.flags(),
HG_BASE_ISLINK='l' in fca.flags())
if tool == "internal:merge":
r = simplemerge.simplemerge(ui, a, b, c, label=['local', 'other'])
elif tool == 'internal:dump':
a = repo.wjoin(fd)
util.copyfile(a, a + ".local")
repo.wwrite(fd + ".other", fco.data(), fco.flags())
repo.wwrite(fd + ".base", fca.data(), fca.flags())
return 1 # unresolved
else:
args = _toolstr(ui, tool, "args", '$local $base $other')
if "$output" in args:
out, a = a, back # read input from backup, write to original
replace = dict(local=a, base=b, other=c, output=out)
args = re.sub("\$(local|base|other|output)",
lambda x: '"%s"' % replace[x.group()[1:]], args)
r = util.system(toolpath + ' ' + args, cwd=repo.root, environ=env)
if not r and _toolbool(ui, tool, "checkconflicts"):
if re.match("^(<<<<<<< .*|=======|>>>>>>> .*)$", fcd.data()):
r = 1
if not r and _toolbool(ui, tool, "checkchanged"):
if filecmp.cmp(repo.wjoin(fd), back):
if ui.promptchoice(_(" output file %s appears unchanged\n"
"was merge successful (yn)?") % fd,
(_("&Yes"), _("&No")), 1):
r = 1
if _toolbool(ui, tool, "fixeol"):
_matcheol(repo.wjoin(fd), back)
if r:
ui.warn(_("merging %s failed!\n") % fd)
else:
os.unlink(back)
os.unlink(b)
os.unlink(c)
return r