From: Helmut Eller <eller.helmut@gmail.com>
To: kawa@sourceware.org
Subject: Re: Prompt on read
Date: Tue, 21 Nov 2017 23:31:00 -0000 [thread overview]
Message-ID: <m28tezfbur.fsf@caladan> (raw)
In-Reply-To: <b9109562-725d-0410-fa04-7326faca91b8@bothner.com>
On Tue, Nov 21 2017, Per Bothner wrote:
>> Despite that the prompt in line two is confusing, the line number in the
>> third prompt seems wrong. I would expect that read works basically like
>> read-line,
>
> Yes and no. read reads an S-expression, and there may be a many-to-many
> relationship between S-expressions and lines. A prompt is printed before
> each input line -
If a prompt is printed before each input line, then why does calling
read-line not print a prompt?
> however note it is possible for a procedure to change the
> prompt, for example to the empty string.
You mean something like (fluid-let ((input-prompt1 "")) ...) or
something else? Hmm, that would work for me.
> FWIW I can't come up with any valid use-case for explicitly calling
> read on an interactive port. The problem is error recovery.
> Enlighten me.
Uhm, a REPL that wants to print its own prompt? Or something like
(format #t "Please enter a filename: ")
(open-output-file (read))
Helmut
next prev parent reply other threads:[~2017-11-21 23:31 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-11-21 15:44 Helmut Eller
2017-11-21 22:49 ` Per Bothner
2017-11-21 23:31 ` Helmut Eller [this message]
2017-11-22 21:27 ` Per Bothner
2017-11-22 23:11 ` Helmut Eller
2017-11-26 3:32 ` Per Bothner
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