local configs = require 'lspconfig/configs'
local util = require 'lspconfig/util'
local lsp = vim.lsp
local api = vim.api

local server_name = "elmls"
local bin_name = "elm-language-server"

local default_capabilities = lsp.protocol.make_client_capabilities()
default_capabilities.offsetEncoding = {"utf-8", "utf-16"}
local elm_root_pattern = util.root_pattern("elm.json")

configs[server_name] = {
  default_config = {
    cmd = {bin_name};
    -- TODO(ashkan) if we comment this out, it will allow elmls to operate on elm.json. It seems like it could do that, but no other editor allows it right now.
    filetypes = {"elm"};
    root_dir = function(fname)
      local filetype = api.nvim_buf_get_option(0, 'filetype')
      if filetype == 'elm' or (filetype == 'json' and fname:match("elm%.json$")) then
        return elm_root_pattern(fname)
      end
    end;
    init_options = {
      elmPath = "elm",
      elmFormatPath = "elm-format",
      elmTestPath = "elm-test",
      elmAnalyseTrigger = "change",
    };
  };
  docs = {
    package_json = "https://raw.githubusercontent.com/elm-tooling/elm-language-client-vscode/master/package.json";
    description = [[
https://github.com/elm-tooling/elm-language-server#installation

If you don't want to use Nvim to install it, then you can use:
```sh
npm install -g elm elm-test elm-format @elm-tooling/elm-language-server
```
]];
    default_config = {
      root_dir = [[root_pattern("elm.json")]];
    };
  };
}

-- vim:et ts=2 sw=2