vimPlugins.moveline-nvim: fix darwin support

pkgs/applications/editors/vim/plugins/non-generated/moveline-nvim/default.nix

@@ -3,6 +3,7 @@
   fetchFromGitHub,
   rustPlatform,
   vimUtils,
+  stdenv,
 }:
 let
   version = "0.3.1-unstable-2023-07-06";
@@ -30,11 +31,18 @@ vimUtils.buildVimPlugin {
   inherit src version;
   pname = "moveline-nvim";
 
-  preInstall = ''
-    mkdir -p lua
-    ln -s ${moveline-lib}/lib/libmoveline.so lua/moveline.so
-  '';
+  preInstall =
+    # https://github.com/neovim/neovim/issues/21749
+    # Need to still copy generated library as `so` because neovim doesn't check for `dylib`
+    let
+      ext = stdenv.hostPlatform.extensions.sharedLibrary;
+    in
+    ''
+      mkdir -p lua
+      ln -s ${moveline-lib}/lib/libmoveline${ext} lua/moveline.so
+    '';
 
+  # Plugin generates a non lua file output that needs to be manually required
   nvimRequireCheck = "moveline";
 
   meta = {
@@ -42,8 +50,5 @@ vimUtils.buildVimPlugin {
     homepage = "https://github.com/willothy/moveline.nvim";
     license = lib.licenses.mit;
     maintainers = with lib.maintainers; [ redxtech ];
-    badPlatforms = [
-      lib.systems.inspect.patterns.isDarwin
-    ];
   };
 }