create-xdc.sh improvements, use project name as default PACKAGE_NAME

create-xdc.sh

@@ -1,12 +1,17 @@
 #!/bin/sh
 
-if [ $# -eq 0 ]
-then
-    echo "usage: zip-xdc.sh PACKAGE_NAME"
-    exit
-fi
-
-PACKAGE_NAME=$1
+case "$1" in
+    "-h" | "--help")
+        echo "usage: ${0##*/} [PACKAGE_NAME]"
+        exit
+        ;;
+    "")
+        PACKAGE_NAME=${PWD##*/}
+        ;;
+    *)
+        PACKAGE_NAME=$1
+        ;;
+esac
 
 rm $PACKAGE_NAME.xdc 2> /dev/null
 zip -9 --recurse-paths $PACKAGE_NAME.xdc * --exclude README.md webxdc.js "*.sh" "*.xdc"