modules: refactor plugins code in top-level

modules/top-level/plugins/mk-plugin-pack.nix

@@ -0,0 +1,60 @@
+{ lib, pkgs }:
+let
+  inherit (import ./utils.nix lib) normalizePlugin;
+in
+{ pluginsToCombine, pathsToLink }:
+let
+
+  overridePlugin =
+    plugin:
+    plugin.plugin.overrideAttrs (prev: {
+      nativeBuildInputs = lib.remove pkgs.vimUtils.vimGenDocHook prev.nativeBuildInputs or [ ];
+      configurePhase = ''
+        ${prev.configurePhase or ""}
+        rm -vf doc/tags'';
+    });
+
+  # Every plugin has its own generated help tags (doc/tags)
+  # Remove them to avoid collisions, new help tags
+  # will be generate for the entire pack later on
+  overriddenPlugins = map overridePlugin pluginsToCombine;
+
+  # Gather python 3 dependencies from every plugins
+  python3Dependencies =
+    ps:
+    lib.pipe pluginsToCombine [
+      (builtins.catAttrs "plugin")
+      (builtins.catAttrs "python3Dependencies")
+      (builtins.concatMap (f: f ps))
+    ];
+
+  # Combined plugin
+  combinedPlugin = pkgs.vimUtils.toVimPlugin (
+    pkgs.buildEnv {
+      name = "plugin-pack";
+      paths = overriddenPlugins;
+      inherit pathsToLink;
+
+      # Remove empty directories and activate vimGenDocHook
+      # TODO: figure out why we are running the `preFixup` hook in `postBuild`
+      postBuild = ''
+        find $out -type d -empty -delete
+        runHook preFixup
+      '';
+      passthru = {
+        inherit python3Dependencies;
+      };
+    }
+  );
+
+  # Combined plugin configs
+  combinedConfig = lib.pipe pluginsToCombine [
+    (builtins.catAttrs "config")
+    (builtins.filter (config: config != null && config != ""))
+    (builtins.concatStringsSep "\n")
+  ];
+in
+normalizePlugin {
+  plugin = combinedPlugin;
+  config = combinedConfig;
+}