vimtex: init plugin (#146)

plugins/languages/vimtex.nix

@@ -0,0 +1,42 @@
+{ pkgs
+, lib
+, config
+, ...
+}:
+let
+  cfg = config.plugins.vimtex;
+  helpers = import ../helpers.nix { inherit lib; };
+in
+with lib;
+{
+  options.plugins.vimtex = {
+
+    enable = mkEnableOption "vimtex";
+
+    package = helpers.mkPackageOption "vimtex" pkgs.vimPlugins.vimtex;
+
+    extraConfig = helpers.mkNullOrOption types.attrs ''
+      The configuration options for vimtex without the 'vimtex_' prefix.
+      Example: To set 'vimtex_compiler_enabled' to 1, write
+        extraConfig = {
+          compiler_enabled = true;
+        };
+    '';
+  };
+
+  config =
+    let
+      globals = {
+        enabled = cfg.enable;
+      } // cfg.extraConfig;
+    in
+    mkIf cfg.enable {
+
+      extraPlugins = [ cfg.package ];
+
+      # Usefull for inverse search
+      extraPackages = with pkgs; [ pstree xdotool ];
+
+      globals = mapAttrs' (name: value: nameValuePair ("vimtex_" + name) value) globals;
+    };
+}