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# filemerge.py - file-level merge handling for Mercurial
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#
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# Copyright 2006, 2007, 2008 Matt Mackall <mpm@selenic.com>
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#
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# This software may be used and distributed according to the terms
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# of the GNU General Public License, incorporated herein by reference.
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from node import nullrev
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from i18n import _
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import util, os, tempfile, simplemerge, re, filecmp
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def _toolstr(ui, tool, part, default=""):
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return ui.config("merge-tools", tool + "." + part, default)
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def _toolbool(ui, tool, part, default=False):
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return ui.configbool("merge-tools", tool + "." + part, default)
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def _findtool(ui, tool):
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k = _toolstr(ui, tool, "regkey")
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if k:
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p = util.lookup_reg(k, _toolstr(ui, tool, "regname"))
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if p:
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p = util.find_exe(p + _toolstr(ui, tool, "regappend"))
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if p:
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return p
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return util.find_exe(_toolstr(ui, tool, "executable", tool))
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def _picktool(repo, ui, path, binary, symlink):
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def check(tool, pat, symlink, binary):
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tmsg = tool
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if pat:
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tmsg += " specified for " + pat
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if pat and not _findtool(ui, tool): # skip search if not matching
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ui.warn(_("couldn't find merge tool %s\n") % tmsg)
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elif symlink and not _toolbool(ui, tool, "symlink"):
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ui.warn(_("tool %s can't handle symlinks\n") % tmsg)
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elif binary and not _toolbool(ui, tool, "binary"):
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ui.warn(_("tool %s can't handle binary\n") % tmsg)
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elif not util.gui() and _toolbool(ui, tool, "gui"):
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ui.warn(_("tool %s requires a GUI\n") % tmsg)
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else:
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return True
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return False
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# HGMERGE takes precedence
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hgmerge = os.environ.get("HGMERGE")
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if hgmerge:
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return (hgmerge, hgmerge)
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# then patterns
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for pat, tool in ui.configitems("merge-patterns"):
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mf = util.matcher(repo.root, "", [pat], [], [])[1]
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if mf(path) and check(tool, pat, symlink, False):
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toolpath = _findtool(ui, tool)
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return (tool, '"' + toolpath + '"')
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# then merge tools
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tools = {}
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for k,v in ui.configitems("merge-tools"):
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t = k.split('.')[0]
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if t not in tools:
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tools[t] = int(_toolstr(ui, t, "priority", "0"))
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names = tools.keys()
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tools = [(-p,t) for t,p in tools.items()]
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tools.sort()
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uimerge = ui.config("ui", "merge")
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if uimerge:
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if uimerge not in names:
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return (uimerge, uimerge)
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tools.insert(0, (None, uimerge)) # highest priority
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tools.append((None, "hgmerge")) # the old default, if found
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for p,t in tools:
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toolpath = _findtool(ui, t)
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if toolpath and check(t, None, symlink, binary):
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return (t, '"' + toolpath + '"')
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# internal merge as last resort
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return (not (symlink or binary) and "internal:merge" or None, None)
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def _eoltype(data):
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"Guess the EOL type of a file"
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if '\0' in data: # binary
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return None
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if '\r\n' in data: # Windows
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return '\r\n'
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if '\r' in data: # Old Mac
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return '\r'
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if '\n' in data: # UNIX
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return '\n'
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return None # unknown
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def _matcheol(file, origfile):
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"Convert EOL markers in a file to match origfile"
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tostyle = _eoltype(open(origfile, "rb").read())
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if tostyle:
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data = open(file, "rb").read()
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style = _eoltype(data)
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if style:
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newdata = data.replace(style, tostyle)
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if newdata != data:
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open(file, "wb").write(newdata)
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def filemerge(repo, fw, fd, fo, wctx, mctx):
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"""perform a 3-way merge in the working directory
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fw = original filename in the working directory
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fd = destination filename in the working directory
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fo = filename in other parent
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wctx, mctx = working and merge changecontexts
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"""
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def temp(prefix, ctx):
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pre = "%s~%s." % (os.path.basename(ctx.path()), prefix)
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(fd, name) = tempfile.mkstemp(prefix=pre)
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data = repo.wwritedata(ctx.path(), ctx.data())
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f = os.fdopen(fd, "wb")
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f.write(data)
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f.close()
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return name
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def isbin(ctx):
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try:
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return util.binary(ctx.data())
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except IOError:
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return False
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fco = mctx.filectx(fo)
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if not fco.cmp(wctx.filectx(fd).data()): # files identical?
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return None
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ui = repo.ui
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fcm = wctx.filectx(fw)
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fca = fcm.ancestor(fco) or repo.filectx(fw, fileid=nullrev)
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binary = isbin(fcm) or isbin(fco) or isbin(fca)
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symlink = fcm.islink() or fco.islink()
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tool, toolpath = _picktool(repo, ui, fw, binary, symlink)
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ui.debug(_("picked tool '%s' for %s (binary %s symlink %s)\n") %
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(tool, fw, binary, symlink))
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if not tool:
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tool = "internal:local"
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if ui.prompt(_(" no tool found to merge %s\n"
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"keep (l)ocal or take (o)ther?") % fw,
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_("[lo]"), _("l")) != _("l"):
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tool = "internal:other"
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if tool == "internal:local":
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return 0
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if tool == "internal:other":
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repo.wwrite(fd, fco.data(), fco.fileflags())
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return 0
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if tool == "internal:fail":
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return 1
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# do the actual merge
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a = repo.wjoin(fd)
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b = temp("base", fca)
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c = temp("other", fco)
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out = ""
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back = a + ".orig"
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util.copyfile(a, back)
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if fw != fo:
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repo.ui.status(_("merging %s and %s\n") % (fw, fo))
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else:
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repo.ui.status(_("merging %s\n") % fw)
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repo.ui.debug(_("my %s other %s ancestor %s\n") % (fcm, fco, fca))
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# do we attempt to simplemerge first?
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if _toolbool(ui, tool, "premerge", not (binary or symlink)):
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r = simplemerge.simplemerge(a, b, c, quiet=True)
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if not r:
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ui.debug(_(" premerge successful\n"))
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os.unlink(back)
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os.unlink(b)
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os.unlink(c)
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return 0
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util.copyfile(back, a) # restore from backup and try again
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env = dict(HG_FILE=fd,
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HG_MY_NODE=str(wctx.parents()[0]),
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HG_OTHER_NODE=str(mctx),
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HG_MY_ISLINK=fcm.islink(),
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HG_OTHER_ISLINK=fco.islink(),
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HG_BASE_ISLINK=fca.islink())
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if tool == "internal:merge":
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r = simplemerge.simplemerge(a, b, c, label=['local', 'other'])
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else:
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args = _toolstr(ui, tool, "args", '$local $base $other')
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if "$output" in args:
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out, a = a, back # read input from backup, write to original
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replace = dict(local=a, base=b, other=c, output=out)
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args = re.sub("\$(local|base|other|output)",
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lambda x: '"%s"' % replace[x.group()[1:]], args)
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r = util.system(toolpath + ' ' + args, cwd=repo.root, environ=env)
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if not r and _toolbool(ui, tool, "checkconflicts"):
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if re.match("^(<<<<<<< .*|=======|>>>>>>> .*)$", fcm.data()):
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r = 1
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if not r and _toolbool(ui, tool, "checkchanged"):
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if filecmp.cmp(repo.wjoin(fd), back):
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if ui.prompt(_(" output file %s appears unchanged\n"
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"was merge successful (yn)?") % fd,
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_("[yn]"), _("n")) != _("y"):
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r = 1
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if _toolbool(ui, tool, "fixeol"):
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_matcheol(repo.wjoin(fd), back)
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if r:
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repo.ui.warn(_("merging %s failed!\n") % fd)
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else:
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os.unlink(back)
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os.unlink(b)
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os.unlink(c)
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return r
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