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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 *
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from i18n import _
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import util, os, tempfile, context
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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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fcm = wctx.filectx(fw)
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fcmdata = wctx.filectx(fd).data()
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fco = mctx.filectx(fo)
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if not fco.cmp(fcmdata): # files identical?
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return None
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fca = fcm.ancestor(fco)
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if not fca:
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fca = repo.filectx(fw, fileid=nullrev)
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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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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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cmd = (os.environ.get("HGMERGE") or repo.ui.config("ui", "merge")
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or "hgmerge")
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r = util.system('%s "%s" "%s" "%s"' % (cmd, a, b, c), cwd=repo.root,
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environ={'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 r:
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repo.ui.warn(_("merging %s failed!\n") % fd)
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os.unlink(b)
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os.unlink(c)
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return r
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