Added an error message for mistyped options [ Bug #45946 ] and also shortened

the help list into two sections: a long one specified by --help and a short
default one.


git-svn-id: svn+ssh://svn.gentoo.org/var/svnroot/genkernel/trunk@103 67a159dc-881f-0410-a524-ba9dfbe2cb84

gen_cmdline.sh

@@ -1,6 +1,6 @@
 #!/bin/bash
 
-usage() {
+longusage() {
   echo "Gentoo Linux Genkernel ${GK_V}"
   echo "Usage: "
   echo "	genkernel [options] action"
@@ -66,6 +66,20 @@ usage() {
   echo "                                will be included."
 }
 
+usage() {
+  echo "Gentoo Linux Genkernel ${GK_V}"
+  echo "Usage: "
+  echo "	genkernel [options] all"
+  echo
+  echo "Some useful options:"
+  echo "	--menuconfig		Run menuconfig after oldconfig"
+  echo "	--no-clean		Do not run make clean before compilation"
+  echo "	--no-mrproper		Do not run make mrproper before compilation"
+  echo
+  echo "For a detailed list of supported options and flags; issue:"
+  echo "	genkernel --help"
+}
+
 parse_opt() {
 	case "$1" in
 		*\=*)
@@ -244,9 +258,14 @@ parse_cmdline() {
 		      BUILD_KERNEL=1
 	      ;;
 	      --help)
-		      usage
+		      longusage
+		      exit 1
+	      ;;
+	      *)
+		      echo "Error: Unknown option '$*'!"
 		      exit 1
 	      ;;
 
 	esac
 }
+