sane-open: associate as the default launcher for .desktop files

hosts/common/programs/assorted.nix

@@ -770,21 +770,6 @@ in
 
     sane-die-with-parent.sandbox.enable = false;  #< it's a launcher; can't sandbox
 
-    sane-open.sandbox.method = "bwrap";
-    sane-open.sandbox.autodetectCliPaths = "existing";  # for when opening a file
-    sane-open.sandbox.whitelistDbus = [ "user" ];
-    sane-open.sandbox.extraConfig = [
-      "--sane-sandbox-keep-namespace" "pid"  # to toggle keyboard
-    ];
-    sane-open.sandbox.extraHomePaths = [
-      ".local/share/applications"
-    ];
-    sane-open.sandbox.extraRuntimePaths = [ "sway" ];
-    sane-open.suggestedPrograms = [
-      "gdbus"
-      "xdg-utils"
-    ];
-
     screen.sandbox.enable = false;  #< tty; needs to run anything
 
     sequoia.sandbox.method = "bwrap";  # TODO:sandbox: untested

hosts/common/programs/default.nix

@@ -101,6 +101,7 @@
     ./rtkit.nix
     ./s6-rc.nix
     ./sane-input-handler
+    ./sane-open.nix
     ./sane-sandboxed.nix
     ./sane-screenshot.nix
     ./sane-scripts.nix

hosts/common/programs/sane-open.nix

@@ -0,0 +1,21 @@
+{ ... }:
+{
+  sane.programs.sane-open = {
+    sandbox.method = "bwrap";
+    sandbox.autodetectCliPaths = "existing";  # for when opening a file
+    sandbox.whitelistDbus = [ "user" ];
+    sandbox.extraConfig = [
+      "--sane-sandbox-keep-namespace" "pid"  # to toggle keyboard
+    ];
+    sandbox.extraHomePaths = [
+      ".local/share/applications"
+    ];
+    sandbox.extraRuntimePaths = [ "sway" ];
+    suggestedPrograms = [
+      "gdbus"
+      "xdg-utils"
+    ];
+
+    mime.associations."application/x-desktop" = "sane-open-application.desktop";
+  };
+}

pkgs/additional/sane-open/default.nix

@@ -1,6 +1,20 @@
-{ static-nix-shell }:
+{ static-nix-shell
+, copyDesktopItems
+, makeDesktopItem
+}:
 static-nix-shell.mkBash {
   pname = "sane-open";
   srcRoot = ./.;
   pkgs = [ "glib" "jq" "procps" "sway" "util-linux" "xdg-utils" ];
+  nativeBuildInputs = [
+    copyDesktopItems
+  ];
+  desktopItems = [
+    (makeDesktopItem {
+      name = "sane-open-application";
+      exec = "sane-open --application %f";
+      desktopName = ".desktop launcher";
+      noDisplay = true;
+    })
+  ];
 }