mrcjkb/haskell-tools.nvim插件安装运行故障求助

问题背景 #

• 本地Haskell及ghci运行正常，但使用mrcjkb/haskell-tools.nvim插件时，严格遵循文档操作、复制可用配置、从零重装均无效
• 初始错误：打开.hs文件或执行checkhealth命令时，抛出attempt to call field 'joinpath' (a nil value)
• 更新Neovim、重装ghcup、HLS后，错误变更为：无法找到适配GHC 9.4.7的HLS版本，已下载对应GHC版本并配置仍未解决

初始错误日志 #

Error detected while processing BufReadPost Autocommands for "*":
Error executing lua callback: /usr/share/nvim/runtime/filetype.lua:24: Error executing lua: /usr/share/nvim/runtime/filetype.lua:25: BufReadPost Autocommands for "*"..FileType Autocommands for "*"..function <SNR>1_LoadFTPlugin[19]..script /home/draell/.local/share/nvim/lazy/haskell-tools.nvim/ftplugin/haskell.lua: Vim(runtime):E5113: Error while calling lua chunk: ...haskell-tools.nvim/lua/haskell-tools/config/internal.lua:115: attempt to call field 'joinpath' (a nil value)
stack traceback:
...haskell-tools.nvim/lua/haskell-tools/config/internal.lua:115: in main chunk
[C]: in function 'require'
...m/lazy/haskell-tools.nvim/lua/haskell-tools/internal.lua:11: in main chunk
[C]: in function 'require'
.../share/nvim/lazy/haskell-tools.nvim/ftplugin/haskell.lua:1: in main chunk
[C]: in function 'nvim_cmd'
/usr/share/nvim/runtime/filetype.lua:25: in function </usr/share/nvim/runtime/filetype.lua:24>
[C]: in function 'nvim_buf_call'
/usr/share/nvim/runtime/filetype.lua:24: in function </usr/share/nvim/runtime/filetype.lua:10>
stack traceback:
[C]: in function 'nvim_cmd'
/usr/share/nvim/runtime/filetype.lua:25: in function </usr/share/nvim/runtime/filetype.lua:24>
[C]: in function 'nvim_buf_call'
/usr/share/nvim/runtime/filetype.lua:24: in function </usr/share/nvim/runtime/filetype.lua:10>
stack traceback:
[C]: in function 'nvim_buf_call'
/usr/share/nvim/runtime/filetype.lua:24: in function </usr/share/nvim/runtime/filetype.lua:10>

更新后错误日志 #

无法找到适配GHC 9.4.7的HLS版本
未找到的可执行文件名：haskell-language-server-9.4.7,haskell-language-server:

排查与解决步骤 #

针对初始joinpath错误 #

• joinpath是Neovim 0.8+新增的API，执行nvim --version确认版本是否≥0.8，低于该版本需升级到稳定版或最新版
• 若已升级仍报错，执行:Lazy update haskell-tools.nvim（基于Lazy.nvim）将插件更新至最新版

针对HLS版本适配问题 #

1. 确认对应版本HLS已安装
   • 执行ghcup list查看已安装的HLS版本，需存在适配GHC 9.4.7的版本（通常HLS大版本与GHC匹配，如HLS 1.10.x适配GHC 9.4）
   • 未安装则执行ghcup install hls --ghc 9.4.7指定GHC版本安装对应HLS
2. 检查HLS路径是否在系统PATH中
   • 执行which haskell-language-server或which haskell-language-server-9.4.7确认可执行文件路径
   • 若不在PATH，将~/.ghcup/bin添加到环境变量（如在~/.bashrc或~/.zshrc中添加export PATH="$HOME/.ghcup/bin:$PATH"）
3. 手动指定HLS路径到插件配置
   在haskell-tools.nvim的配置中添加HLS绝对路径：

   require('haskell-tools').setup {
     hls = {
       cmd = { '/home/你的用户名/.ghcup/bin/haskell-language-server-9.4.7' },
     },
   }
   

4. 确认项目GHC版本匹配
   检查项目根目录的cabal.project或stack.yaml，确保指定的GHC版本为9.4.7，避免项目使用其他版本导致HLS不兼容

内容的提问来源于stack exchange，提问作者JJoaoll