# 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 __future__ import absolute_import
import filecmp
import os
import re
import tempfile
from .i18n import _
from .node import nullid, short
from . import (
cmdutil,
error,
match,
simplemerge,
tagmerge,
templatekw,
templater,
util,
)
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 _toollist(ui, tool, part, default=[]):
return ui.configlist("merge-tools", tool + "." + part, default)
internals = {}
# Merge tools to document.
internalsdoc = {}
# internal tool merge types
nomerge = None
mergeonly = 'mergeonly' # just the full merge, no premerge
fullmerge = 'fullmerge' # both premerge and merge
class absentfilectx(object):
"""Represents a file that's ostensibly in a context but is actually not
present in it.
This is here because it's very specific to the filemerge code for now --
other code is likely going to break with the values this returns."""
def __init__(self, ctx, f):
self._ctx = ctx
self._f = f
def path(self):
return self._f
def size(self):
return None
def data(self):
return None
def filenode(self):
return nullid
_customcmp = True
def cmp(self, fctx):
"""compare with other file context
returns True if different from fctx.
"""
return not (fctx.isabsent() and
fctx.ctx() == self.ctx() and
fctx.path() == self.path())
def flags(self):
return ''
def changectx(self):
return self._ctx
def isbinary(self):
return False
def isabsent(self):
return True
def internaltool(name, mergetype, onfailure=None, precheck=None):
'''return a decorator for populating internal merge tool table'''
def decorator(func):
fullname = ':' + name
func.__doc__ = "``%s``\n" % fullname + func.__doc__.strip()
internals[fullname] = func
internals['internal:' + name] = func
internalsdoc[fullname] = func
func.mergetype = mergetype
func.onfailure = onfailure
func.precheck = precheck
return func
return decorator
def _findtool(ui, tool):
if tool in internals:
return tool
return findexternaltool(ui, tool)
def findexternaltool(ui, tool):
for kn in ("regkey", "regkeyalt"):
k = _toolstr(ui, tool, kn)
if not k:
continue
p = util.lookupreg(k, _toolstr(ui, tool, "regname"))
if p:
p = util.findexe(p + _toolstr(ui, tool, "regappend"))
if p:
return p
exe = _toolstr(ui, tool, "executable", tool)
return util.findexe(util.expandpath(exe))
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
# internal config: ui.forcemerge
# forcemerge comes from command line arguments, highest priority
force = ui.config('ui', 'forcemerge')
if force:
toolpath = _findtool(ui, force)
if toolpath:
return (force, util.shellquote(toolpath))
else:
# mimic HGMERGE if given tool not found
return (force, force)
# HGMERGE takes next 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, util.shellquote(toolpath))
# then merge tools
tools = {}
disabled = set()
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"))
if _toolbool(ui, t, "disabled", False):
disabled.add(t)
names = tools.keys()
tools = sorted([(-p, t) for t, p in tools.items() if t not in disabled])
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, util.shellquote(toolpath))
# internal merge or prompt as last resort
if symlink or binary:
return ":prompt", None
return ":merge", 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(util.readfile(origfile))
if tostyle:
data = util.readfile(file)
style = _eoltype(data)
if style:
newdata = data.replace(style, tostyle)
if newdata != data:
util.writefile(file, newdata)
@internaltool('prompt', nomerge)
def _iprompt(repo, mynode, orig, fcd, fco, fca, toolconf):
"""Asks the user which of the local or the other version to keep as
the merged version."""
ui = repo.ui
fd = fcd.path()
try:
index = ui.promptchoice(_("no tool found to merge %s\n"
"keep (l)ocal or take (o)ther?"
"$$ &Local $$ &Other") % fd, 0)
choice = ['local', 'other'][index]
if choice == 'other':
return _iother(repo, mynode, orig, fcd, fco, fca, toolconf)
else:
return _ilocal(repo, mynode, orig, fcd, fco, fca, toolconf)
except error.ResponseExpected:
ui.write("\n")
return 1
@internaltool('local', nomerge)
def _ilocal(repo, mynode, orig, fcd, fco, fca, toolconf):
"""Uses the local version of files as the merged version."""
return 0
@internaltool('other', nomerge)
def _iother(repo, mynode, orig, fcd, fco, fca, toolconf):
"""Uses the other version of files as the merged version."""
repo.wwrite(fcd.path(), fco.data(), fco.flags())
return 0
@internaltool('fail', nomerge)
def _ifail(repo, mynode, orig, fcd, fco, fca, toolconf):
"""
Rather than attempting to merge files that were modified on both
branches, it marks them as unresolved. The resolve command must be
used to resolve these conflicts."""
return 1
def _premerge(repo, toolconf, files, labels=None):
tool, toolpath, binary, symlink = toolconf
if symlink:
return 1
a, b, c, back = files
ui = repo.ui
validkeep = ['keep', 'keep-merge3']
# do we attempt to simplemerge first?
try:
premerge = _toolbool(ui, tool, "premerge", not binary)
except error.ConfigError:
premerge = _toolstr(ui, tool, "premerge").lower()
if premerge not in validkeep:
_valid = ', '.join(["'" + v + "'" for v in validkeep])
raise error.ConfigError(_("%s.premerge not valid "
"('%s' is neither boolean nor %s)") %
(tool, premerge, _valid))
if premerge:
if premerge == 'keep-merge3':
if not labels:
labels = _defaultconflictlabels
if len(labels) < 3:
labels.append('base')
r = simplemerge.simplemerge(ui, a, b, c, quiet=True, label=labels)
if not r:
ui.debug(" premerge successful\n")
return 0
if premerge not in validkeep:
util.copyfile(back, a) # restore from backup and try again
return 1 # continue merging
def _mergecheck(repo, mynode, orig, fcd, fco, fca, toolconf):
tool, toolpath, binary, symlink = toolconf
if symlink:
repo.ui.warn(_('warning: internal %s cannot merge symlinks '
'for %s\n') % (tool, fcd.path()))
return False
return True
def _merge(repo, mynode, orig, fcd, fco, fca, toolconf, files, labels, mode):
"""
Uses the internal non-interactive simple merge algorithm for merging
files. It will fail if there are any conflicts and leave markers in
the partially merged file. Markers will have two sections, one for each side
of merge, unless mode equals 'union' which suppresses the markers."""
a, b, c, back = files
ui = repo.ui
r = simplemerge.simplemerge(ui, a, b, c, label=labels, mode=mode)
return True, r
@internaltool('union', fullmerge,
_("warning: conflicts while merging %s! "
"(edit, then use 'hg resolve --mark')\n"),
precheck=_mergecheck)
def _iunion(repo, mynode, orig, fcd, fco, fca, toolconf, files, labels=None):
"""
Uses the internal non-interactive simple merge algorithm for merging
files. It will use both left and right sides for conflict regions.
No markers are inserted."""
return _merge(repo, mynode, orig, fcd, fco, fca, toolconf,
files, labels, 'union')
@internaltool('merge', fullmerge,
_("warning: conflicts while merging %s! "
"(edit, then use 'hg resolve --mark')\n"),
precheck=_mergecheck)
def _imerge(repo, mynode, orig, fcd, fco, fca, toolconf, files, labels=None):
"""
Uses the internal non-interactive simple merge algorithm for merging
files. It will fail if there are any conflicts and leave markers in
the partially merged file. Markers will have two sections, one for each side
of merge."""
return _merge(repo, mynode, orig, fcd, fco, fca, toolconf,
files, labels, 'merge')
@internaltool('merge3', fullmerge,
_("warning: conflicts while merging %s! "
"(edit, then use 'hg resolve --mark')\n"),
precheck=_mergecheck)
def _imerge3(repo, mynode, orig, fcd, fco, fca, toolconf, files, labels=None):
"""
Uses the internal non-interactive simple merge algorithm for merging
files. It will fail if there are any conflicts and leave markers in
the partially merged file. Marker will have three sections, one from each
side of the merge and one for the base content."""
if not labels:
labels = _defaultconflictlabels
if len(labels) < 3:
labels.append('base')
return _imerge(repo, mynode, orig, fcd, fco, fca, toolconf, files, labels)
def _imergeauto(repo, mynode, orig, fcd, fco, fca, toolconf, files,
labels=None, localorother=None):
"""
Generic driver for _imergelocal and _imergeother
"""
assert localorother is not None
tool, toolpath, binary, symlink = toolconf
a, b, c, back = files
r = simplemerge.simplemerge(repo.ui, a, b, c, label=labels,
localorother=localorother)
return True, r
@internaltool('merge-local', mergeonly, precheck=_mergecheck)
def _imergelocal(*args, **kwargs):
"""
Like :merge, but resolve all conflicts non-interactively in favor
of the local changes."""
success, status = _imergeauto(localorother='local', *args, **kwargs)
return success, status
@internaltool('merge-other', mergeonly, precheck=_mergecheck)
def _imergeother(*args, **kwargs):
"""
Like :merge, but resolve all conflicts non-interactively in favor
of the other changes."""
success, status = _imergeauto(localorother='other', *args, **kwargs)
return success, status
@internaltool('tagmerge', mergeonly,
_("automatic tag merging of %s failed! "
"(use 'hg resolve --tool :merge' or another merge "
"tool of your choice)\n"))
def _itagmerge(repo, mynode, orig, fcd, fco, fca, toolconf, files, labels=None):
"""
Uses the internal tag merge algorithm (experimental).
"""
return tagmerge.merge(repo, fcd, fco, fca)
@internaltool('dump', fullmerge)
def _idump(repo, mynode, orig, fcd, fco, fca, toolconf, files, labels=None):
"""
Creates three versions of the files to merge, containing the
contents of local, other and base. These files can then be used to
perform a merge manually. If the file to be merged is named
``a.txt``, these files will accordingly be named ``a.txt.local``,
``a.txt.other`` and ``a.txt.base`` and they will be placed in the
same directory as ``a.txt``."""
a, b, c, back = files
fd = fcd.path()
util.copyfile(a, a + ".local")
repo.wwrite(fd + ".other", fco.data(), fco.flags())
repo.wwrite(fd + ".base", fca.data(), fca.flags())
return False, 1
def _xmerge(repo, mynode, orig, fcd, fco, fca, toolconf, files, labels=None):
tool, toolpath, binary, symlink = toolconf
a, b, c, back = files
out = ""
env = {'HG_FILE': fcd.path(),
'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(),
}
ui = repo.ui
args = _toolstr(ui, tool, "args", '$local $base $other')
if "$output" in args:
out, a = a, back # read input from backup, write to original
replace = {'local': a, 'base': b, 'other': c, 'output': out}
args = util.interpolate(r'\$', replace, args,
lambda s: util.shellquote(util.localpath(s)))
cmd = toolpath + ' ' + args
repo.ui.debug('launching merge tool: %s\n' % cmd)
r = ui.system(cmd, cwd=repo.root, environ=env)
repo.ui.debug('merge tool returned: %s\n' % r)
return True, r
def _formatconflictmarker(repo, ctx, template, label, pad):
"""Applies the given template to the ctx, prefixed by the label.
Pad is the minimum width of the label prefix, so that multiple markers
can have aligned templated parts.
"""
if ctx.node() is None:
ctx = ctx.p1()
props = templatekw.keywords.copy()
props['templ'] = template
props['ctx'] = ctx
props['repo'] = repo
templateresult = template('conflictmarker', **props)
label = ('%s:' % label).ljust(pad + 1)
mark = '%s %s' % (label, templater.stringify(templateresult))
if mark:
mark = mark.splitlines()[0] # split for safety
# 8 for the prefix of conflict marker lines (e.g. '<<<<<<< ')
return util.ellipsis(mark, 80 - 8)
_defaultconflictmarker = ('{node|short} ' +
'{ifeq(tags, "tip", "", "{tags} ")}' +
'{if(bookmarks, "{bookmarks} ")}' +
'{ifeq(branch, "default", "", "{branch} ")}' +
'- {author|user}: {desc|firstline}')
_defaultconflictlabels = ['local', 'other']
def _formatlabels(repo, fcd, fco, fca, labels):
"""Formats the given labels using the conflict marker template.
Returns a list of formatted labels.
"""
cd = fcd.changectx()
co = fco.changectx()
ca = fca.changectx()
ui = repo.ui
template = ui.config('ui', 'mergemarkertemplate', _defaultconflictmarker)
tmpl = templater.templater(None, cache={'conflictmarker': template})
pad = max(len(l) for l in labels)
newlabels = [_formatconflictmarker(repo, cd, tmpl, labels[0], pad),
_formatconflictmarker(repo, co, tmpl, labels[1], pad)]
if len(labels) > 2:
newlabels.append(_formatconflictmarker(repo, ca, tmpl, labels[2], pad))
return newlabels
def _filemerge(premerge, repo, mynode, orig, fcd, fco, fca, labels=None):
"""perform a 3-way merge in the working directory
premerge = whether this is a premerge
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
Returns whether the merge is complete, and the return value of the merge.
"""
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
if not fco.cmp(fcd): # files identical?
return True, None
ui = repo.ui
fd = fcd.path()
binary = fcd.isbinary() or fco.isbinary() or fca.isbinary()
symlink = 'l' in fcd.flags() + fco.flags()
tool, toolpath = _picktool(repo, ui, fd, binary, symlink)
if tool in internals and tool.startswith('internal:'):
# normalize to new-style names (':merge' etc)
tool = tool[len('internal'):]
ui.debug("picked tool '%s' for %s (binary %s symlink %s)\n" %
(tool, fd, binary, symlink))
if tool in internals:
func = internals[tool]
mergetype = func.mergetype
onfailure = func.onfailure
precheck = func.precheck
else:
func = _xmerge
mergetype = fullmerge
onfailure = _("merging %s failed!\n")
precheck = None
toolconf = tool, toolpath, binary, symlink
if mergetype == nomerge:
return True, func(repo, mynode, orig, fcd, fco, fca, toolconf)
if premerge:
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))
if precheck and not precheck(repo, mynode, orig, fcd, fco, fca,
toolconf):
if onfailure:
ui.warn(onfailure % fd)
return True, 1
a = repo.wjoin(fd)
b = temp("base", fca)
c = temp("other", fco)
back = cmdutil.origpath(ui, repo, a)
if premerge:
util.copyfile(a, back)
files = (a, b, c, back)
r = 1
try:
markerstyle = ui.config('ui', 'mergemarkers', 'basic')
if not labels:
labels = _defaultconflictlabels
if markerstyle != 'basic':
labels = _formatlabels(repo, fcd, fco, fca, labels)
if premerge and mergetype == fullmerge:
r = _premerge(repo, toolconf, files, labels=labels)
# complete if premerge successful (r is 0)
return not r, r
needcheck, r = func(repo, mynode, orig, fcd, fco, fca, toolconf, files,
labels=labels)
if needcheck:
r = _check(r, ui, tool, fcd, files)
if r:
if onfailure:
ui.warn(onfailure % fd)
return True, r
finally:
if not r:
util.unlink(back)
util.unlink(b)
util.unlink(c)
def _check(r, ui, tool, fcd, files):
fd = fcd.path()
a, b, c, back = files
if not r and (_toolbool(ui, tool, "checkconflicts") or
'conflicts' in _toollist(ui, tool, "check")):
if re.search("^(<<<<<<< .*|=======|>>>>>>> .*)$", fcd.data(),
re.MULTILINE):
r = 1
checked = False
if 'prompt' in _toollist(ui, tool, "check"):
checked = True
if ui.promptchoice(_("was merge of '%s' successful (yn)?"
"$$ &Yes $$ &No") % fd, 1):
r = 1
if not r and not checked and (_toolbool(ui, tool, "checkchanged") or
'changed' in
_toollist(ui, tool, "check")):
if filecmp.cmp(a, back):
if ui.promptchoice(_(" output file %s appears unchanged\n"
"was merge successful (yn)?"
"$$ &Yes $$ &No") % fd, 1):
r = 1
if _toolbool(ui, tool, "fixeol"):
_matcheol(a, back)
return r
def premerge(repo, mynode, orig, fcd, fco, fca, labels=None):
return _filemerge(True, repo, mynode, orig, fcd, fco, fca, labels=labels)
def filemerge(repo, mynode, orig, fcd, fco, fca, labels=None):
return _filemerge(False, repo, mynode, orig, fcd, fco, fca, labels=labels)
# tell hggettext to extract docstrings from these functions:
i18nfunctions = internals.values()