stk/Doc/Manual/repl-display-prompt.n

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1998-04-30 07:04:33 -04:00
'\" Color=Green
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.so STk-man.macros
.TH repl-display-prompt n 3.99 STk "STk procedure"
.BS
'\" Note: do not modify the .SH NAME line immediately below!
.SH NAME
repl-display-prompt, repl-display-result \- Display a prompt/result in
interactive mode
.SH SYNOPSIS
(\fBrepl-display-prompt \fImodule\fR)
.br
(\fBrepl-display-result \fIvalue\fR)
.BE
.SH DESCRIPTION
.PP
\fBRepl-display-prompt\fR is called by the interactive toplevel loop
before reading a \fIsexpr\fR. This procedure is called with one parameter:
the selected module in the toplevel loop.
.LP
A simple form of this procedure could be:
.CS
(define (repl-display-prompt module)
(let ((p (current-error-port)))
(format p "~A> " (module-name module))
(flush p)))
.CE
.PP
\fBRepl-display-result\fR is called by the interactive toplevel loop
after the evaluation of a \fIsexpr\fR. This procedure is called with the
result of this evaluation as parameter.
.LP
A simple form, mimicking the MIT Scheme way of presenting results, could be:
.CS
(define (repl-display-result value)
(format #t "\\n;Value: ~S\\n\\n" value))
.CE