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From: Bart Schaefer <schaefer@brasslantern.com>
To: OG Code Poet <ogcodepoet@gmail.com>
Cc: Zsh hackers list <zsh-workers@zsh.org>
Subject: Re: Read a line from user without clearing screen below the prompt while allowing user to use arrow keys to make edits in middle of line
Date: Fri, 30 Dec 2022 09:56:21 -0800	[thread overview]
Message-ID: <CAH+w=7ZDaLHEP6qa6eV0oSWkJAhj-TbY+sZZM+rUBrkgGoBF-w@mail.gmail.com> (raw)
In-Reply-To: <CADmFDtUiRpYTYh21-aeE_UuSAHqG=c2vcRT0oSND+i9ehu4SOA@mail.gmail.com>

(Leaving this on -workers because of the possible bug mentioned at the end.)

On Thu, Dec 29, 2022 at 9:38 PM OG Code Poet <ogcodepoet@gmail.com> wrote:
>
> Using Bash ``tput cup 0 0; read -e -p "Enter input: " userinput`` works well for getting a line of user input:
>
> * It does not clear screen below the prompt
> * It allows user to use arrow keys to go to middle of line and edit a mistake they might have made while typing

Bash is invoking the GNU "readline" library for the "read" builtin.
Unlike ZLE, which despite having "line" in its name attempts to be a
reasonable multi-line editor, readline is designed to do exactly what
its name says, so it doesn't do any other screen prep.

> How can this be achieved in zsh?

Closest I can come up with is this:

vared-finish() { tput rc }
zle -N vared-finish
tput sc
vared -f vared-finish -c -p "%{$(tput cup 0 0)%}Enter input: " userinput

However, this is not entirely satisfactory because the finish widget
is not invoked if this is interrupted by ^C or ^G (send-break), and
vared then clears the screen before exiting.  This is possibly a bug?
Shouldn't the finish widget(s) always be run when the line editor
exits, even if it exits "abnormally"?  (This affects the PS1 ZLE as
well.)


  parent reply	other threads:[~2022-12-30 17:57 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-12-30  5:37 OG Code Poet
2022-12-30  8:58 ` Mikael Magnusson
2022-12-30 17:56 ` Bart Schaefer [this message]
2022-12-31  3:52   ` OG Code Poet
2022-12-31  5:20     ` Bart Schaefer
2022-12-31  5:44       ` OG Code Poet
2022-12-31 13:13       ` Oliver Kiddle
2023-01-01  0:10         ` Bart Schaefer

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