# gimme some head lung

fn file_lines(path) do
  const size = fs:size(path)
  if size < 0 return :nil
  const contents = if size > 0 fs:read_bytes(path, 0, size) else ""
  const raw_lines = contents:split("\n")
  let result = {}
  for index in 0..raw_lines:len() do
    if (index < raw_lines:len() - 1 or raw_lines[index]:len() > 0) result:push(raw_lines[index])
  end
  return result
end

const context = env.ctx
if context.argv:len() < 2 do puts("usage: head [n] <path>\n") end
else do
  let limit = 10
  let path_arg = context.argv[1]
  if (context.argv:len() >= 3 and parse_pid(context.argv[1]) >= 0) do limit = parse_pid(context.argv[1]) path_arg = context.argv[2] end
  const lines = file_lines(expand_path(path_arg))
  if lines == :nil do puts("head: no such file\n") end
  else do
    let index = 0
    while (index < lines:len() and index < limit) do puts("#{lines[index]}\n") index += 1 end
  end
end