pkgs: add ff2mpv-go

pkgs/default.nix

@@ -4,6 +4,8 @@ rec {
 
   diff-flake = pkgs.callPackage ./diff-flake { };
 
+  ff2mpv-go = pkgs.callPackage ./ff2mpv-go { };
+
   havm = pkgs.callPackage ./havm { };
 
   i3-get-window-criteria = pkgs.callPackage ./i3-get-window-criteria { };

pkgs/ff2mpv-go/default.nix

@@ -0,0 +1,30 @@
+{ buildGoModule, fetchgit, lib, mpv }:
+buildGoModule rec {
+  pname = "ff2mpv-go";
+  version = "1.0.1";
+
+  src = fetchgit {
+    url = "https://git.clsr.net/util/ff2mpv-go/";
+    rev = "v${version}";
+    sha256 = "sha256-e/AuOA3isFTyBf97Zwtr16yo49UdYzvktV5PKB/eH/s=";
+  };
+
+  vendorSha256 = "sha256-pQpattmS9VmO3ZIQUFn66az8GSmB4IvYhTTCFn6SUmo=";
+
+  postPatch = ''
+    sed -i -e 's,"mpv","${mpv}/bin/mpv",' ff2mpv.go
+  '';
+
+  postInstall = ''
+    mkdir -p "$out/lib/mozilla/native-messaging-hosts"
+    $out/bin/ff2mpv-go --manifest > "$out/lib/mozilla/native-messaging-hosts/ff2mpv.json"
+  '';
+
+  meta = with lib; {
+    description = ''
+      Native messaging host for ff2mpv written in Go.
+    '';
+    homepage = "https://git.clsr.net/util/ff2mpv-go/";
+    license = licenses.publicDomain;
+  };
+}