.files/.config/nvim/lua/lsp/haskell.lua

local mylsp = require("lsp")
local border = mylsp.border
local on_attach = mylsp.on_attach

-- Haskell
vim.g.haskell_tools = {
    tools = {
        log = { level = vim.log.levels.OFF },
        hover = {
            border = border,
            stylize_markdown = true,
        },
    },
    hls = {
        on_attach = function(client, bufnr)
            local ht = require("haskell-tools")
            local nnoremap = function(bind, callback, userargs)
                local args = userargs or {}
                args.buffer = bufnr
                vim.keymap.set("n", bind, callback, args)
            end

            nnoremap("<leader>hhe", ht.lsp.buf_eval_all)
            nnoremap("<leader>hhs", ht.hoogle.hoogle_signature)
            nnoremap("<leader>hhr", ht.repl.toggle)

            on_attach(client, bufnr)
        end,
        default_settings = {
            haskell = {
                checkProject = false, -- PERF: don't check the entire project on initial load
                formattingProvider = "fourmolu",
                plugin = {
                    rename = {
                        config = {
                            diff = true, -- (experimental) rename across modules
                        },
                    },
                },
            },
        },
        settings = function(project_root)
            local ht = require("haskell-tools")
            return ht.lsp.load_hls_settings(project_root, { settings_file_pattern = "hls.json" })
        end,
    },
}