From cf817454041353a235f02d34245e0873a072f31a Mon Sep 17 00:00:00 2001
From: Profpatsch <mail@profpatsch.de>
Date: Sun, 13 Dec 2020 06:54:25 +0100
Subject: [PATCH] tree-sitter: split arguments in library.nix & document

---
 pkgs/development/tools/parsing/tree-sitter/default.nix |  6 ++++--
 pkgs/development/tools/parsing/tree-sitter/library.nix | 10 +++++++++-
 2 files changed, 13 insertions(+), 3 deletions(-)

diff --git a/pkgs/development/tools/parsing/tree-sitter/default.nix b/pkgs/development/tools/parsing/tree-sitter/default.nix
index 027d10c0572..37811943a6d 100644
--- a/pkgs/development/tools/parsing/tree-sitter/default.nix
+++ b/pkgs/development/tools/parsing/tree-sitter/default.nix
@@ -41,8 +41,10 @@ let
 
   builtGrammars = let
     change = name: grammar:
-      callPackage ./library.nix {
-        language = name; inherit version; source = fetchGrammar grammar;
+      callPackage ./library.nix {} {
+        language = name;
+        inherit version;
+        source = fetchGrammar grammar;
       };
   in
     # typescript doesn't have parser.c in the same place as others
diff --git a/pkgs/development/tools/parsing/tree-sitter/library.nix b/pkgs/development/tools/parsing/tree-sitter/library.nix
index 36245ff7d44..f78939b22ff 100644
--- a/pkgs/development/tools/parsing/tree-sitter/library.nix
+++ b/pkgs/development/tools/parsing/tree-sitter/library.nix
@@ -1,7 +1,15 @@
 { stdenv
-, language
 , tree-sitter
+}:
+
+# Build a parser grammar and put the resulting shared object in `$out/parser`
+
+{
+  # language name
+  language
+  # version of tree-sitter
 , version
+  # source for the language grammar
 , source
 }: