feat: add TODO

docs/best-practices/debugging.md

@@ -1,4 +1,6 @@
-# Debugging with `nix repl`
+# Debugging Derivations and Nix Expressions
+
+## Debugging with `nix repl`
 
 We have frequently used nix repl `<nixpkgs>` throughout this guide to examine the source code. It is a powerful tool that helps us understand how things work in Nix.
 
@@ -141,3 +143,19 @@ outputs.nixosConfigurations.ai.config.home-manager.users.ryan.home.file..config/
 ```
 
 As you can see, after loading your Nix flake into the REPL, you can check every attribute of the flake. This capability is very convenient for debugging purposes.
+
+
+## Debugging functions provided by nixpkgs
+
+TODO
+
+## Debugging by using `NIX_DEBUG` in derivation
+
+TODO
+
+## References
+
+- [How to make nix build display all commands executed by make?](https://www.reddit.com/r/NixOS/comments/14stdgy/how_to_make_nix_build_display_all_commands/)
+  - use `NIX_DEBUG=7` in derivation
+- [Collection of functions useful for debugging broken nix expressions.](https://github.com/NixOS/nixpkgs/blob/master/lib/debug.nix)
+

docs/zh/best-practices/debugging.md

@@ -1,4 +1,6 @@
-# 通过 `nix repl` 查看源码、调试配置
+# 调试 Derivation 跟 Nix 表达式
+
+## 通过 `nix repl` 查看源码、调试配置
 
 前面我们已经使用 `nix repl '<nixpkgs>'` 看过很多次源码了，这是一个非常强大的工具，可以帮助我们理解 Nix 的工作原理。
 
@@ -137,3 +139,20 @@ outputs.nixosConfigurations.ai.config.home-manager.users.ryan.home.file..config/
 ```
 
 能看到，通过 `nix repl` 加载好我的 flake 配置后，就能很方便地检查所有的配置项了，这对于调试非常有用。
+
+
+## 使用 nixpkgs 中提供的调试函数
+
+TODO
+
+## 使用 derivation 的 `NIX_DEBUG` 参数调试
+
+TODO
+
+## 参考文档
+
+- [How to make nix build display all commands executed by make?](https://www.reddit.com/r/NixOS/comments/14stdgy/how_to_make_nix_build_display_all_commands/)
+  - use `NIX_DEBUG=7` in derivation
+- [Collection of functions useful for debugging broken nix expressions.](https://github.com/NixOS/nixpkgs/blob/master/lib/debug.nix)
+
+