--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/upmana/mercurial/filemerge.py	Fri Oct 30 22:21:40 2009 -0500
@@ -0,0 +1,231 @@
+# 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.prompt(_(" no tool found to merge %s\n"
+                       "keep (l)ocal or take (o)ther?") % fd,
+                     (_("&Local"), _("&Other")), _("l")) != _("l"):
+            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.prompt(_(" output file %s appears unchanged\n"
+                "was merge successful (yn)?") % fd,
+                (_("&Yes"), _("&No")), _("n")) != _("y"):
+                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