From 404d057e89eb77099cd6ca8d50b79ccc52bb7914 Mon Sep 17 00:00:00 2001
From: Matthieu Coudron <mattator@gmail.com>
Date: Thu, 7 Mar 2019 17:17:18 +0900
Subject: Added an example about overlay

---
 doc/languages-frameworks/lua.section.md | 23 ++++++++++++++++++++++-
 1 file changed, 22 insertions(+), 1 deletion(-)

(limited to 'doc/languages-frameworks')

diff --git a/doc/languages-frameworks/lua.section.md b/doc/languages-frameworks/lua.section.md
index b4b593af7496b..f11a1a5862ec6 100644
--- a/doc/languages-frameworks/lua.section.md
+++ b/doc/languages-frameworks/lua.section.md
@@ -72,6 +72,27 @@ For the sake of completeness, here's another example how to install the environm
 }
 ```
 
+### How to override a Python package using overlays?
+
+Use the following overlay template:
+
+```nix
+self: prev:
+{
+
+  lua = prev.lua.override {
+    packageOverrides = luaself: luaprev: {
+
+      luarocks-nix = luaprev.luarocks-nix.overrideAttrs(oa: {
+        pname = "toto";
+        src = /home/my_luarocks/repository;
+      });
+  };
+
+  luaPackages = lua.pkgs;
+}
+```
+
 ### Temporary Lua environment with `nix-shell`
 
 For development you may need to use multiple environments.
@@ -154,7 +175,7 @@ Each interpreter has the following attributes:
 The `buildLuarocksPackage` function is implemented in `pkgs/development/interpreters/lua-5/build-lua-package.nix`
 The following is an example:
 ```nix
-luaexpat = buildLuaPackage rec {
+luaexpat = buildLuarocksPackage rec {
   pname = "luaexpat";
   version = "1.3.0-1";
 
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