一名开发者分享了其在 Haskell 开发中引入语言服务器（hls）及热重载工具组合的实践经验，旨在实现接近 Lisp 的交互式开发体验 1。该实践主要涉及通过 Emacs 内置的 Eglot 客户端连接 hls 以获取代码内省功能，并利用 Nix flake 与 direnv 进行依赖管理和环境沙箱化 1。
在代码热重载方面，作者使用 ghcid 监听源文件变化并自动重编译，同时结合 foreign-store 库在代码替换时保留进程状态 1。然而，这一工作流也暴露出若干问题：首先，ghcid 在 Nix 开发 shell 外无法正常工作，必须手动启动 Nix shell 1。其次，Eglot 与 hls 会增加编辑延迟，影响 Vim 命令的响应可靠性 1。最后，由于 ghci 一次只能跟踪一组源文件，作者将所有代码合并到一个可执行组件中 1。
A developer has detailed their experience integrating a language server and hot-reloading tools into a Haskell workflow to achieve an interactive development environment akin to Lisp 1. To enable code introspection, the author configured the built-in Eglot client in Emacs to connect with the Haskell Language Server (hls) 1. The development environment was sandboxed and managed using Nix flakes alongside direnv for dependency handling 1. Furthermore, the setup utilized ghcid to monitor source file modifications and trigger automatic recompilations, while the foreign-store library was integrated to preserve process state during code replacements 1.
The author encountered several technical limitations during this process 1. Specifically, ghcid does not function correctly outside of a Nix development shell, requiring the manual startup of the Nix shell to operate properly 1. Additionally, the use of Eglot and hls introduced editing latency, which affected the responsiveness and reliability of Vim commands 1. Finally, because ghci can only track a single set of source files at a time, the author consolidated all code into one executable component to overcome this constraint 1.
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