minimal_init.lua

local on_windows = vim.loop.os_uname().version:match 'Windows'

local function join_paths(...)
  local path_sep = on_windows and '\\' or '/'
  local result = table.concat({ ... }, path_sep)
  return result
end

vim.cmd [[set runtimepath=$VIMRUNTIME]]

local temp_dir
if on_windows then
  temp_dir = vim.loop.os_getenv 'TEMP'
else
  temp_dir = '/tmp'
end

vim.cmd('set packpath=' .. join_paths(temp_dir, 'nvim', 'site'))

local package_root = join_paths(temp_dir, 'nvim', 'site', 'pack')
local install_path = join_paths(package_root, 'packer', 'start', 'packer.nvim')
local compile_path = join_paths(install_path, 'plugin', 'packer_compiled.lua')

local function load_plugins()
  require('packer').startup {
    {
      'wbthomason/packer.nvim',
      'neovim/nvim-lspconfig',
    },
    config = {
      package_root = package_root,
      compile_path = compile_path,
    },
  }
end

_G.load_config = function()
  vim.lsp.set_log_level 'trace'
  if vim.fn.has 'nvim-0.5.1' == 1 then
    require('vim.lsp.log').set_format_func(vim.inspect)
  end
  local nvim_lsp = require 'lspconfig'

  -- Add the server that troubles you here
  local name = 'efm'
  local cmd = {vim.fn.expand('~/.cache/nvim/langservers/bin/efm-langserver') }
  if not name then
    print 'You have not defined a server name, please edit minimal_init.lua'
  end
  if not nvim_lsp[name].document_config.default_config.cmd and not cmd then
    print [[You have not defined a server default cmd for a server
      that requires it please edit minimal_init.lua]]
  end

  nvim_lsp[name].setup {
    cmd = cmd,
    init_options = {documentFormatting = true},
    settings = {
      lintDebounce = 250000000,
      rootMarkers = {'.git'},
      languages = {
        ocaml = {
          {
            formatCommand = 'ocamlformat --name ${INPUT} -',
            rootMarkers = {'.ocamlformat'},
            formatStdin = true,
          },
        },
        yaml = {
          {
            formatCommand = 'npx -p @fsouza/prettierd prettierd ${INPUT}',
            rootMarkers = {'.git'},
            formatStdin = true,
          },
        },
      },
    },
    filetypes = {'ocaml', 'yaml'},
  }

  print [[You can find your log at $HOME/.cache/nvim/lsp.log. Please paste in a github issue under a details tag as described in the issue template.]]
end

if vim.fn.isdirectory(install_path) == 0 then
  vim.fn.system { 'git', 'clone', 'https://github.com/wbthomason/packer.nvim', install_path }
  load_plugins()
  require('packer').sync()
  vim.cmd [[autocmd User PackerComplete ++once lua load_config()]]
else
  load_plugins()
  require('packer').sync()
  _G.load_config()
end