play.d/common.sh: major clean up

play.d/common.sh

@@ -6,33 +6,34 @@ fatal()
     exit 1
 }
 
-if [ "$1" = "--remove" ] ; then
+case "$1" in
+    "--remove")
         epm remove $PKGNAME
         exit
-fi
-
-if [ "$1" = "--package" ] ; then
+        ;;
+    "--package")
         echo "$PKGNAME"
         exit
-fi
-
-if [ "$1" = "--installed" ] ; then
+        ;;
+    "--installed")
         epm installed $PKGNAME
         exit
-fi
-
-if [ "$1" = "--description" ] ; then
+        ;;
+    "--description")
         echo "$DESCRIPTION"
         exit
-fi
-
-
-[ "$1" != "--run" ] && [ "$1" != "--update" ] && fatal "Unknown command $1"
-
-if [ "$1" = "--update" ] ; then
+        ;;
+    "--update")
         if ! epm installed $PKGNAME ; then
             echo "Skipping update of $PKGNAME (package is not installed)"
             exit
         fi
-fi
+        ;;
+    "--run")
+        # just pass
+        ;;
+    *)
+        fatal "Unknown command $1"
+        ;;
+esac