(module main)

(fn stdin_result () -> (result string i32)
  (std.io.read_stdin_result))

(fn stdin_text_or_empty ((value (result string i32))) -> string
  (match value
    ((ok text)
      text)
    ((err code)
      "")))

(fn stdin_len_or_code ((value (result string i32))) -> i32
  (match value
    ((ok text)
      (std.string.len text))
    ((err code)
      code)))

(fn stdin_ok_len () -> i32
  (std.string.len (unwrap_ok (stdin_result))))

(test "stdin result test runner returns ok"
  (is_ok (stdin_result)))

(test "stdin result payload length matches match"
  (let value (result string i32) (stdin_result))
  (= (std.string.len (unwrap_ok value)) (stdin_len_or_code value)))

(test "stdin result match observes ok payload"
  (let value (result string i32) (stdin_result))
  (= (std.string.len (stdin_text_or_empty value)) (stdin_len_or_code value)))

(fn main () -> i32
  (let value (result string i32) (stdin_result))
  (if (is_ok value)
    (std.string.len (unwrap_ok value))
    1))