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(* Demonstrate the use of literal command markup *)
theory Sendback imports Main begin
ML {* val pgasciiN = "PGASCII";
fun special oct =
if print_mode_active pgasciiN then chr 1 ^ chr (ord (oct_char oct) - 167)
else oct_char oct;
fun sendback cmd = writeln ("Try this: \n " ^ (special "375") ^ cmd ^ "\n\n")
*}
theorem and_comms: "A & B --> B & A"
proof
ML {* sendback "assume \"A & B\"" *}
ML {* sendback "then; show \"B & A\"" *}
ML {* sendback "proof; assume B and A; then" *}
ML {* sendback "show ?thesis; ..; qed" *}
ML {* sendback "qed" *}
qed
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