More improvements to zipme.sh tool

tools/mkconfigvars.sh

@@ -32,6 +32,45 @@
 # POSSIBILITY OF SUCH DAMAGE.
 #
 
+USAGE="USAGE: $0 [-d|h] [-v <major.minor>]"
+ADVICE="Try '$0 -h' for more information"
+
+unset VERSION
+
+while [ ! -z "$1" ]; do 
+    case $1 in
+    -v )
+        shift
+        VERSION=$1
+        ;;
+    -d )
+        set -x
+        ;;
+    -h )
+        echo "$0 is a tool for generation of configuration variable documentation"
+        echo ""
+        echo $USAGE
+        echo ""
+        echo "Where:"
+        echo "  -v <major.minor>"
+        echo "     The NuttX version number expressed as a major and minor number separated"
+        echo "     by a period"
+        echo "  -d"
+        echo "     Enable script debug"
+        echo "  -h"
+        echo "     show this help message and exit"
+        exit 0
+        ;;
+    * )
+        echo "Unrecognized option: ${1}"
+        echo $USAGE
+        echo $ADVICE
+        exit 1
+        ;;
+    esac
+    shift
+done
+
 # Find the directory we were executed from and were we expect to
 # see the directories to tar up
 
@@ -44,18 +83,12 @@ KCONFIG2MAKEDIR=tools
 HTMLFILE=Documentation/NuttXConfigVariables.html
 BKUPFILE=Documentation/NuttXConfigVariables.bkp
 
-# A version argument may be provided
-
-if [ ! -z "${1}" ]; then
-  VERSION=${1}
-fi
-
 if [ -x ./${MYNAME} ] ; then
    cd .. || { echo "ERROR: cd .. failed" ; exit 1 ; }
 fi
 
 if [ ! -x tools/${MYNAME} ] ; then
-   echo "ERROR:  This file must be executed from the top-level NuttX directory"
+   echo "ERROR:  This file must be executed from the top-level NuttX directory: $PWD"
    exit 1
 fi