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#!/bin/sh

set -e # bail out quickly on failure
   
LOCAL="$1"
BASE="$2"
OTHER="$3"

BACKUP="$LOCAL.orig"
   
Restore ()
{
    cp "$BACKUP" "$LOCAL" 
}

ExitOK ()
{
    rm "$LOCAL.other"
    exit $?
}

echo "$LOCAL $BASE OTHER"

# Back up our file & other file
cp "$LOCAL" "$BACKUP"
cp "$OTHER" "$LOCAL.other"

# Attempt to do a non-interactive merge
if which merge > /dev/null 2>&1 ; then
    if merge "$LOCAL" "$BASE" "$OTHER" 2> /dev/null; then
           # success!
        ExitOK 
    fi
    Restore
elif which diff3 > /dev/null 2>&1 ; then
    if diff3 -m "$BACKUP" "$BASE" "$OTHER" > "$LOCAL" ; then
           # success
        ExitOK
    fi
    Restore
fi

if emacsclient --eval "(ediff-merge-with-ancestor \"$BACKUP\" \"$OTHER\" \"$BASE\" nil \"$LOCAL\")" 
      then       
       ExitOK
   fi

echo "emacs_merge: failed to merge files"
exit 1