Updated editvorbis code.

There are now more options and safeguards.

editvorbis.sh

@@ -16,8 +16,62 @@
 # You should have received a copy of the GNU Affero General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
-mkdir -p /tmp/editvorbis/
-vorbiscomment "$1" > /tmp/editvorbis/comment.txt
-$EDITOR /tmp/editvorbis/comment.txt
-vorbiscomment -w -c /tmp/editvorbis/comment.txt "$1"
-rm -rf /tmp/editvorbis/
+# constants
+APPNAME="editvorbis"
+VERSION="v2.0"
+
+# helper functions
+function print_usage {
+	echo "Usage: $0 <file>"
+	echo "Usage: $0 -h | -v"
+}
+
+function print_info {
+	echo "$APPNAME $VERSION"
+	echo "Script for editing vorbis tags with your favorite editor."
+}
+
+# check number of arguments
+if [ $# -ne 1 ]; then
+	echo "Wrong number of arguments."
+	print_usage
+	exit 1
+fi
+
+# show help information
+if [ "$1" == "-h" ]; then
+	print_info
+	print_usage
+	echo "  <file>  File to edit tags."
+	echo "  -h      Show this help information."
+	echo "  -v      Show script version."
+	exit 0
+fi
+
+# print version
+if [ "$1" == "-v" ]; then
+	echo "$APPNAME $VERSION"
+	exit 0
+fi
+
+# check if vorbiscomment is installed
+command -v vorbiscomment > /dev/null
+if [ $? == 1 ]; then
+	echo "Could not find vorbiscomment command in your PATH. Maybe it's not installed?"
+	exit 1
+fi
+
+# check if the file exists
+if [ ! -f $1 ]; then
+	echo "Regular file $1 does not exist."
+	exit 1
+fi
+
+TMPDIR="/tmp/editvorbis"
+TAGFILE="$TMPDIR/$1.txt"
+
+mkdir -p $TMPDIR
+vorbiscomment "$1" > "$TAGFILE"
+$EDITOR "$TAGFILE"
+vorbiscomment -w -c "$TAGFILE" "$1"
+rm -rf $TMPDIR