dotfiles/nvim/lua/plugins/haskell-tools.lua

local M = {}

function M.config()
  local ht = require('haskell-tools')
  local def_opts = { noremap = true, silent = true, }

  ht.start_or_attach {
    hls = {
      on_attach = function(_, bufnr)
        local opts = vim.tbl_extend('keep', def_opts, { buffer = bufnr, })
        -- haskell-language-server relies heavily on codeLenses,
        -- so auto-refresh (see advanced configuration) is enabled by default
        vim.keymap.set('n', '<space>ca', vim.lsp.codelens.run, opts)
        vim.keymap.set('n', '<space>hs', ht.hoogle.hoogle_signature, opts)
        vim.keymap.set('n', '<space>ea', ht.lsp.buf_eval_all, opts)
      end,
    },
  }

  -- Suggested keymaps that do not depend on haskell-language-server:
  local bufnr = vim.api.nvim_get_current_buf()
  -- set buffer = bufnr in ftplugin/haskell.lua
  local opts = { noremap = true, silent = true, buffer = bufnr }

  -- Toggle a GHCi repl for the current package
  vim.keymap.set('n', '<leader>rr', ht.repl.toggle, opts)
  -- Toggle a GHCi repl for the current buffer
  vim.keymap.set('n', '<leader>rf', function()
    ht.repl.toggle(vim.api.nvim_buf_get_name(0))
  end, def_opts)
  vim.keymap.set('n', '<leader>rq', ht.repl.quit, opts)

  -- Detect nvim-dap launch configurations
  -- (requires nvim-dap and haskell-debug-adapter)
  -- ht.dap.discover_configurations(bufnr)
  return 1
end

return M