qenya: Patch Feishin with mpv support

home/qenya/default.nix

@@ -1,6 +1,7 @@
 {
   imports = [
     ./dconf
+    ./feishin.nix
     ./firefox.nix
     ./fonts.nix
     ./git.nix

home/qenya/feishin.nix

@@ -0,0 +1,24 @@
+{ config, lib, pkgs, osConfig, ... }:
+
+# Feishin ideally wants to see mpv at runtime, but this isn't catered for by
+# the derivation in nixpkgs as it isn't strictly necessary.
+# An easier way to do this would be to write mpv's full nix store path to
+# Feishin's config. But Feishin has one JSON file for config and state, and
+# we'd rather not overwrite the latter. Until and unless home-manager grows
+# support for partially patching files, we live with this.
+
+let
+  inherit (lib) mkIf;
+  isGraphical = osConfig.services.xserver.enable;
+in
+{
+  home.packages = mkIf isGraphical [
+    (pkgs.feishin.overrideAttrs (originalAttrs: {
+      buildInputs = originalAttrs.buildInputs ++ [ pkgs.mpv ];
+      postFixup = ''
+        ${originalAttrs.postFixup or ""}
+        wrapProgram $out/bin/feishin --prefix PATH : ${lib.makeBinPath [ pkgs.mpv ]}
+      '';
+    }))
+  ];
+}

home/qenya/packages.nix

@@ -23,7 +23,6 @@ in
   ] ++ optionals isGraphical [
     bitwarden
     discord
-    feishin
     gimp-with-plugins
     jellyfin-media-player
     tor-browser-bundle-bin