Downloaded this from: http://www-verimag.imag.fr/~moy/opendocument/oodiff

odtdiff

@@ -0,0 +1,184 @@
+#! /bin/sh
+#
+#   Copyright
+#
+#	Copyright (C) 2009-2010 Jari Aalto <jari.aalto@cante.net>
+#	Copyright (C) 2008 Matthieu Moy <Matthieu.Moy@imag.fr>
+#
+#   License
+#
+#       This program is free software; you can redistribute it and/or modify
+#       it under the terms of the GNU General Public License as published by
+#       the Free Software Foundation; either version 2 of the License, or
+#       (at your option) any later version.
+#
+#       This program is distributed in the hope that it will be useful,
+#       but WITHOUT ANY WARRANTY; without even the implied warranty of
+#       MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+#       GNU General Public License for more details
+#       at <http://www.gnu.org/licenses/>.
+
+[ "$debug" ] && set -x
+
+PROGRAM=$(basename $0)
+prg=diff
+
+if [ -x /opt/csw/bin/gdiff ]; then 			# SUN/OS Solaris
+    prg=/opt/csw/bin/gdiff
+fi
+
+DIFF_PROGRAM=${DIFF_PROGRAM:-$prg}
+
+Warn ()
+{
+    echo "$*" >&2
+}
+
+Die ()
+{
+    Warn "$PROGRAM: [ERROR] $*"
+    exit 1
+}
+
+usage ()
+{
+    echo "\
+NAME
+    $PROGRAM - Diff Open Document files
+
+SYNOPSIS
+    [debug=1] $PROGRAM [options] FILE1 [FILE2]
+
+DESCRIPTION
+   Show difference of openoffice documents as plain text ASCII.
+   If FILE2 is not provided, $PROGRAM will search for an svn base
+   file, and show the diff against the last commited version in SVN.
+
+   Depends on program odt2txt being installed.
+
+OPTIONS
+    Options are same as in diff(1) command.
+
+    If variable 'debug' exists in environment, the program is run
+    with shell \"set -x\" option.
+
+EXAMPLES
+
+    To use form command line:
+
+        oodiff file-v1.odt file-v2.odt
+
+    To use from Git:
+
+        [debug=1] GIT_EXTERNAL_DIFF=oodiff git diff file.odt
+
+AUTHORS
+    Original author is Matthieu Moy <Matthieu.Moy@imag.fr>
+    Major cleanup by Jari Aalto <jari.aalto@cante.net>
+
+AVAILABILITY
+    http://www-verimag.imag.fr/~moy/opendocument/
+
+COPYRIGHT
+
+    License GPL-2+: GNU GPL version 2 or later
+    <http://gnu.org/licenses/gpl.html>. This is free software: you
+    are free to change and redistribute it. There is NO WARRANTY,
+    to the extent permitted by law.
+
+SEE ALSO
+    odt2txt(1)"
+}
+
+clean_up ()
+{
+    [ "$ft1" ] && rm -f "$ft1"
+    [ "$ft2" ] && rm -f "$ft2"
+}
+
+Main ()
+{
+    file1=""
+    file2=""
+
+    while test $# -ne 0; do
+	case "$1" in
+	    --help|-h)
+		usage
+		exit 0
+		;;
+	    -*)
+		opts="$opts $1"
+		;;
+	    *)
+		if [ ! "$file1" ]; then
+		    file1=$1
+		elif [ ! "$file2" ]; then
+		    file2=$1
+		else
+		    usage
+		    exit 1
+		fi
+		;;
+	esac
+	shift
+    done
+
+    if [ ! "$file1" ]; then
+	Die "missing FILE1 argument."
+    fi
+
+    svnfile="$(dirname "$file1")/.svn/text-base/${file1##*/}.svn-base"
+
+    if [ ! "$file2" ]; then
+        if [ -f "$svnfile" ]; then
+	    file2="$file1"
+	    file1="$svnfile"
+        else
+	    Die "missing FILE2 argument" \
+		"(tried SVN base file, but it doesn't exist: $svnfile)"
+        fi
+    fi
+
+    if [ -d "$file1" ]; then
+	# Be recursive.
+	# echo "entering $file1"
+	for file in "$file1"/*
+	do
+	    "$0" $opts "$file" $(echo "$file" | sed "s@^$file1/@$file2/@")
+	done
+
+    else
+	ft1=$(mktemp /tmp/oodiff.$$.1.XXXXXXXXXX) \
+	    || ft1="/tmp/oodiff.$$.1"
+
+	ft2=$(mktemp /tmp/oodiff.$$.2.XXXXXXXXXX) \
+	    || ft2="/tmp/oodiff.$$.2"
+
+	trap 'clean_up; exit 0' 1 2 3 15
+
+	if odt2txt "$file1" > "$ft1" 2>/dev/null && \
+	   odt2txt "$file2" > "$ft2" 2>/dev/null
+	then
+
+	    if $DIFF_PROGRAM -L "$file1" -L "$file2" $opts "$ft1" "$ft2"
+	    then
+		# no text change
+		if diff -q "$file1" "$file2"; then
+		    : # no change at all
+		else
+		    echo "OpenDocument files $file1 and $file2 files differ" \
+			 "(same text content)"
+		fi
+	    fi
+	else
+	    $DIFF_PROGRAM $opts "$file1" "$file2"
+	fi
+
+	clean_up
+    fi
+}
+
+Main "$@"
+
+# End of file