From e764298465fec2fd3e07f6794413622ec494d5d7 Mon Sep 17 00:00:00 2001
From: Damien Cassou <damien@cassou.me>
Date: Sun, 7 May 2023 18:14:38 +0200
Subject: [PATCH] emacs.pkgs.treesit-grammars: init fake package

Adding this package gives Emacs access to tree-sitter grammars.
---
 .../emacs/elisp-packages/manual-packages.nix  |  2 ++
 .../treesit-grammars/default.nix              | 19 +++++++++++++++++++
 2 files changed, 21 insertions(+)
 create mode 100644 pkgs/applications/editors/emacs/elisp-packages/manual-packages/treesit-grammars/default.nix

diff --git a/pkgs/applications/editors/emacs/elisp-packages/manual-packages.nix b/pkgs/applications/editors/emacs/elisp-packages/manual-packages.nix
index 944332e5bc53..6f3e3ae9dcc8 100644
--- a/pkgs/applications/editors/emacs/elisp-packages/manual-packages.nix
+++ b/pkgs/applications/editors/emacs/elisp-packages/manual-packages.nix
@@ -75,6 +75,8 @@ in
 
   tree-sitter-langs = callPackage ./manual-packages/tree-sitter-langs { final = self; };
 
+  treesit-grammars = callPackage ./manual-packages/treesit-grammars { };
+
   tsc = callPackage ./manual-packages/tsc { };
 
   urweb-mode = callPackage ./manual-packages/urweb-mode { };
diff --git a/pkgs/applications/editors/emacs/elisp-packages/manual-packages/treesit-grammars/default.nix b/pkgs/applications/editors/emacs/elisp-packages/manual-packages/treesit-grammars/default.nix
new file mode 100644
index 000000000000..8b2c723f2293
--- /dev/null
+++ b/pkgs/applications/editors/emacs/elisp-packages/manual-packages/treesit-grammars/default.nix
@@ -0,0 +1,19 @@
+{ pkgs, lib, tree-sitter, ... }:
+
+let
+  libExt = pkgs.stdenv.targetPlatform.extensions.sharedLibrary;
+  grammarToAttrSet = drv:
+      {
+        name = "lib/lib${lib.strings.removeSuffix "-grammar" (lib.strings.getName drv)}${libExt}";
+        path = "${drv}/parser";
+      };
+in
+{
+  with-all-grammars = pkgs.linkFarm "emacs-treesit-grammars"
+    (map grammarToAttrSet pkgs.tree-sitter.allGrammars);
+
+  # Use this one like this:
+  # treesit-grammars.with-grammars (grammars: with grammars; [tree-sitter-bash])
+  with-grammars = fn: pkgs.linkFarm "emacs-treesit-grammars"
+    (map grammarToAttrSet (fn pkgs.tree-sitter.builtGrammars));
+}