x plane: Add ortho4XP scenery update script to x-plane-env

x-plane/default.nix

@@ -35,10 +35,15 @@ let
     Installer   run Installer
     SHELL       run bash inside FHS environment
     prepare     prepare all currently activated addons
-    revert [ADDON]...  remove modifications from named addons
-    navdata FILE [OLDCYCLE]  update navigation DB
-    /abs/path [ARG]...  run /abs/path inside FHS environment
-    rel/path [ARG]...  run $XPLANEPATH/rel/path inside FHS environment
+    revert [ADDON]...
+                remove modifications from named addons
+    navdata FILE [OLDCYCLE]
+                update navigation DB
+    ortho       update links to zOrtho4XP scenery files
+    /abs/path [ARG]...
+                run /abs/path inside FHS environment
+    rel/path [ARG]...
+                run $XPLANEPATH/rel/path inside FHS environment
   EOF
   }
   sys=${stdenv.targetPlatform.system}
@@ -57,6 +62,7 @@ let
     prepare) exec ${prepareScript} ;;
     revert) shift; exec ${revertScript} "$@" ;;
     navdata) shift; exec ${navdbScript} "$@" ;;
+    ortho) exec ${orthoScript} ;;
     /*) exec "$@" ;;
     *) shift; exec "''${XPLANEPATH}/$bin" "$@" ;;
   esac
@@ -166,6 +172,17 @@ let
     ln -sf "$newpath" "$XPLANEPATH/Custom Data"
   '';
 
+  orthoScript = writeScript "update-scenery-packs-ini" ''
+    : ''${XPLANEPATH:=${xplanePathStr}}
+    (
+        cd "$XPLANEPATH"
+        sed -i -e '/^SCENERY_PACK Custom Scenery\/zOrtho4XP_.*$/d' "Custom Scenery/scenery_packs.ini"
+        for f in "Custom Scenery/zOrtho4XP_"*; do
+            echo "SCENERY_PACK $f"
+        done >>"Custom Scenery/scenery_packs.ini"
+    )
+  '';
+
 in buildFHSUserEnv rec {
   name = "x-plane-env";
   passthru = { inherit addons; };