local function file_exists(file)
  local f = io.open(file, "rb")
  if f then f:close() end
  return f ~= nil
end

local function get_lines_from(file)
  if not file_exists(file) then return {} end
  local lines = {}
  for line in io.lines(file) do 
    lines[#lines + 1] = line
  end
  return lines
end

local function header()
  local filetype = vim.api.nvim_buf_get_option(0, 'filetype')
  if filetype ~= "" then
    local current_file_fullpath = debug.getinfo(1, "S").source:sub(2)
    local current_file_path = current_file_fullpath:match("(.*/)")
    local tpl_path =  current_file_path .. '../../data/tpl/header-' .. filetype .. '.tpl'
    if file_exists(tpl_path) then
      local lines = get_lines_from(tpl_path)
      vim.api.nvim_put(lines, "l", false, true)
    else
      print("Pas de fichier pour ce filetype (" .. tpl_path .. ")")
    end

  else
    print("Pas de filetype")
  end
end

return header