hgmerge: use diff3 if available

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

hgmerge: use diff3 if available

diff3 may be more readily available than merge

manifest hash: 67a314ac42aa78410d64a6c3d36c2d575a588533
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.4.0 (GNU/Linux)

iD8DBQFCoRUtywK+sNU5EO8RAmFPAJ0aN8VNvN9zpE/zov6wT3M98vGfDwCfXEOk
xZlQHYIGrCLOFQiCQxIfr7I=
=Asv9
-----END PGP SIGNATURE-----

hgmerge

@@ -1,68 +1,79 b''
 #!/bin/bash
 #
 # hgmerge - default merge helper for Mercurial
 #
 # This tries to find a way to do three-way merge on the current system.
 # The result ought to end up in $1.
 
 set -e # bail out quickly on failure
 
 LOCAL=$1
 BASE=$2
 OTHER=$3
 
 # Back up our file
 cp $LOCAL $LOCAL.orig
 
 # Attempt to do a non-interactive merge
 if which merge > /dev/null ; then
     if merge $LOCAL $BASE $OTHER 2> /dev/null; then
 	# success!
 	exit 0
     fi
     cp $LOCAL.orig $LOCAL
+elif which diff3 > /dev/null ; then
+    if diff3 -m $LOCAL.orig $BASE $OTHER > $LOCAL ; then
+	# success
+	exit 0
+    fi
+    cp $LOCAL.orig $LOCAL
 fi
 
 # try using kdiff3, which is fairly nice
 if which kdiff3 > /dev/null ; then
     if kdiff3 --auto $BASE $LOCAL $OTHER -o $LOCAL ; then
 	exit 0
     else
 	exit 1
     fi
 fi
 
 # try using tkdiff, which is a bit less sophisticated
 if which tkdiff > /dev/null ; then
     if tkdiff $LOCAL $OTHER -a $BASE -o $LOCAL ; then
 	exit 0
     else
 	exit 1
     fi
 fi
 
 # Attempt to do a merge with $EDITOR
 if which merge > /dev/null ; then
     echo "conflicts detected in $LOCAL"
     merge $LOCAL $BASE $OTHER 2>/dev/null || $EDITOR $LOCAL
+    exit 0
+fi
+
+if which diff3 > /dev/null ; then
+    echo "conflicts detected in $LOCAL"
+    diff3 -m $LOCAL.orig $BASE $OTHER > $LOCAL || $EDITOR $LOCAL
+    exit 0
 fi
 
 # attempt to manually merge with diff and patch
 if which diff > /dev/null ; then
     if which patch > /dev/null ; then
 	T=`mktemp`
 	diff -u $BASE $OTHER > $T
 	if patch $LOCAL < $T ; then
 	    exit 0
 	else
 	    $EDITOR $LOCAL $LOCAL.rej
 	fi
 	rm $T
 	exit 1
     fi
 fi
 
 echo "hgmerge: unable to find merge, tkdiff, kdiff3, or diff+patch!"
 exit 1
-
-