view mercurial/filemerge.py @ 8781:385a2d94885e

hgrc.5: fix quoting of literal strings

The quotes would go wrong in many places due to differences between
asciidoc version 8.2.7 used by Benoit and 8.4.5 used by me. Between
those versions asciidoc stopped interpreting the content of `quoted
strings`, and so `*` would start bold text in the old version, but do
nothing in the new version.

To complicate things further, `\*` would escape the bold tag in the
old version, but in the new version the backslash was inserted
literally into the output (because the backtick quotes it).

I've now replaced backticks with non-quoting plusses and escaped
backslashes as appropriate.

# filemerge.py - file-level merge handling for Mercurial
#
# Copyright 2006, 2007, 2008 Matt Mackall <[e-mail]>
#
# 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)

def _findtool(ui, tool):
    if tool in ("internal:fail", "internal:local", "internal:other"):
        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:
        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'])
    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