plexamp: init at 3.0.3

Desktop file does not work.

pkgs/applications/audio/plexamp/default.nix

@@ -0,0 +1,39 @@
+{ lib, fetchurl, appimageTools, pkgs }:
+
+let
+  pname = "plexamp";
+  version = "3.0.3";
+  name = "${pname}-${version}";
+
+  src = fetchurl {
+    url = "https://plexamp.plex.tv/plexamp.plex.tv/desktop/Plexamp-${version}.AppImage";
+    sha256 = "1rh608kcpdx04p2w2nl94b9p96i37sij5shjhgvak041s64wbpg5";
+    name="${pname}-${version}.AppImage";
+  };
+
+  appimageContents = appimageTools.extractType2 {
+    inherit name src;
+  };
+in appimageTools.wrapType2 {
+  inherit name src;
+
+  multiPkgs = null; # no 32bit needed
+  extraPkgs = pkgs: appimageTools.defaultFhsEnvArgs.multiPkgs pkgs ++ [ pkgs.bash ];
+
+  extraInstallCommands = ''
+    ln -s $out/bin/${name} $out/bin/${pname}
+    install -m 444 -D ${appimageContents}/plexamp.desktop $out/share/applications/plexamp.desktop
+    install -m 444 -D ${appimageContents}/plexamp.png \
+      $out/plexamp.png
+    substituteInPlace $out/share/applications/plexamp.desktop \
+      --replace 'Exec=AppRun' 'Exec=${pname}'
+  '';
+
+  meta = with lib; {
+    description = "A beautiful Plex music player for audiophiles, curators, and hipsters.";
+    homepage = "https://plexamp.com/";
+    license = licenses.unfree;
+    maintainers = with maintainers; [ killercup ];
+    platforms = [ "x86_64-linux" ];
+  };
+}

pkgs/top-level/all-packages.nix

@@ -22007,6 +22007,8 @@ in
 
   pistol = callPackage ../tools/misc/pistol { };
 
+  plexamp = callPackage ../applications/audio/plexamp { };
+
   plex-media-player = libsForQt512.callPackage ../applications/video/plex-media-player { };
 
   plex-mpv-shim = python3Packages.callPackage ../applications/video/plex-mpv-shim { };