use {
  'MrcJkb/haskell-tools.nvim',
  requires = {
    'neovim/nvim-lspconfig',
    'nvim-lua/plenary.nvim',
    'nvim-telescope/telescope.nvim', -- optional
  },
  -- tag = 'x.y.z' -- [^1]
}

local ht = require('haskell-tools')
local def_opts = { noremap = true, silent = true, }
ht.setup {
  hls = {
    -- See nvim-lspconfig's  suggested configuration for keymaps, etc.
    on_attach = function(client, 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)
      -- default_on_attach(client, bufnr)  -- if defined, see nvim-lspconfig
    end,
  },
}
-- Suggested keymaps that do not depend on haskell-language-server
-- Toggle a GHCi repl for the current package
vim.keymap.set('n', '<leader>rr', ht.repl.toggle, def_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, def_opts)

require('haskell-tools').hoogle.hoogle_signature()

-- defaults
require('haskell-tools').setup {
  tools = { -- haskell-tools options
    codeLens = {
      -- Whether to automatically display/refresh codeLenses
      -- (explicitly set to false to disable)
      autoRefresh = true,
    },
    hoogle = {
      -- 'auto': Choose a mode automatically, based on what is available.
      -- 'telescope-local': Force use of a local installation.
      -- 'telescope-web': The online version (depends on curl).
      -- 'browser': Open hoogle search in the default browser.
      mode = 'auto',
    },
    repl = {
      -- 'builtin': Use the simple builtin repl
      -- 'toggleterm': Use akinsho/toggleterm.nvim
      handler = 'builtin',
      builtin = {
        create_repl_window = function(view)
          -- create_repl_split | create_repl_vsplit | create_repl_tabnew | create_repl_cur_win
          return view.create_repl_split { size = vim.o.lines / 3 }
        end
      },
    },
  },
  hls = { -- LSP client options
    -- ...
    haskell = { -- haskell-language-server options
      formattingProvider = 'ormolu',
      checkProject = true, -- Setting this to true could have a performance impact on large mono repos.
      -- ...
    }
  }
}

hls = {
  haskell = {
    plugin = {
      class = { -- missing class methods
        codeLensOn = false,
      },
      importLens = { -- make import lists fully explicit
        codeLensOn = false,
      },
      refineImports = { -- refine imports
        codeLensOn = false,
      },
      tactics = { -- wingman
        codeLensOn = false,
      },
      moduleName = { -- fix module names
        globalOn = false,
      },
      eval = { -- evaluate code snippets
        globalOn = false,
      },
      ['ghcide-type-lenses'] = { -- show/add missing type signatures
        globalOn = false,
      },
    },
  },
},

local iron = require("iron.core")
iron.setup {
  config = {
    repl_definition = {
      haskell = {
        command = function(meta)
          local file = vim.api.nvim_buf_get_name(meta.current_bufnr)
          -- call `require` in case iron is set up before haskell-tools
          return require('haskell-tools').repl.mk_repl_cmd(file)
        end,
      },
    },
  },
}

local ht = require('haskell-tools')
-- Run a hoogle signature for the value under the cursor
ht.hoogle.hoogle_signature()

local ht = require('haskell-tools')
-- Toggle a GHCi repl
ht.repl.toggle()
-- Toggle a GHCi repl for `file`
ht.repl.toggle(file)
-- Quit the repl
ht.repl.quit()
-- Paste a command to the repl from register `reg`. (`reg` defaults to '"')
ht.repl.paste(reg)
-- Query the repl for the type of register `reg`. (`reg` defaults to '"')
ht.repl.paste_type(reg)
-- Query the repl for the type of word under the cursor
ht.repl.cword_type()
-- Query the repl for info on register `reg`. (`reg` defaults to '"')
ht.repl.paste_info(reg)
-- Query the repl for info on the word under the cursor
ht.repl.cword_info()
-- Load a file into the repl
ht.repl.load_file(file)
-- Reload the repl
ht.repl.reload()