ref: d83edb22d47134d0bafbdeb45325a68c090b6983
dir: /sys/lib/python/mercurial/filemerge.py/
# 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, incorporated herein by reference.
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_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