add an icon

just/default.nix

@@ -1,5 +1,6 @@
 { stdenv
 , callPackage
+, copyDesktopItems
 , fetchFromGitHub
 , fetchurl
 , glib-networking
@@ -10,10 +11,12 @@
 , librsvg
 , lua53Packages
 , lua5_3
+, makeDesktopItem
 , makeWrapper
 , writeText
 }:
-let fennel = fetchurl {
+let pname = "just";
+    fennel = fetchurl {
       name = "fennel.lua";
       url = "https://fennel-lang.org/downloads/fennel-1.0.0";
       hash = "sha256:1nha32yilzagfwrs44hc763jgwxd700kaik1is7x7lsjjvkgapw7";
@@ -28,19 +31,31 @@ let fennel = fetchurl {
       readline
     ]);
 in stdenv.mkDerivation {
-  pname = "just";
+  inherit pname fennel;
   version = "0.1";
   src =./.;
-  inherit fennel;
 
   # this will have to go into a makeWrapper thingy when we
   # get to the point of producing an actual package
   GIO_EXTRA_MODULES = "${glib-networking}/lib/gio/modules";
+
   buildInputs = [ lua gtk3 webkitgtk gobject-introspection.dev
                   glib-networking  ];
-  nativeBuildInputs = [ lua makeWrapper ];
+  nativeBuildInputs = [ lua makeWrapper copyDesktopItems ];
 
   makeFlags = [ "PREFIX=${placeholder "out"}" ];
+
+  desktopItems = [
+    (makeDesktopItem rec {
+      desktopName = "Just Browsing";
+      name = pname;
+      exec = pname;
+      categories = "Network;" ;
+      icon = ./just.png;
+      genericName = "Web browser";
+    })
+  ];
+
   postInstall = ''
     wrapProgram $out/bin/just  --set GI_TYPELIB_PATH "$GI_TYPELIB_PATH"
   '';