Allow marking software as installed

scripts/Common/Scripts/software.fish

@@ -1,5 +1,11 @@
 #!/bin/env fish
 begin
+    set -a installed
+
+    function getSWName
+        echo "PortValhalla"
+    end
+
     function installSW
     end
 
@@ -8,9 +14,16 @@ begin
 
     function runInstaller -a action
         if [ -z "$action" ] || [ "$action" = "install" ]
+            set -a installed (getSWName)
             installSW $argv[2..]
         else if [ "$action" = "configure" ]
+            if contains (getSWName) $installed
                 configureSW $argv[2..]
+            else
+                printf %s%s\n \
+                    "$(tput setaf 3)Warning: $(tput sgr0)" \
+                    "$(getSWName) does not seem to be installed -- Skipping"
+            end
         end
     end
 end