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From: Roman Perepelitsa <roman.perepelitsa@gmail.com>
To: Sebastian Gniazdowski <sgniazdowski@gmail.com>
Cc: Zsh Users <zsh-users@zsh.org>
Subject: Re: A function to display message under the prompt without zle active
Date: Sat, 22 Jun 2019 19:45:05 +0200	[thread overview]
Message-ID: <CAN=4vMr4iXsCAOvw5a=ZNSKL=LDYA9UjD8HnJv-A1bRxs0BL2A@mail.gmail.com> (raw)
In-Reply-To: <CAKc7PVA4gB_6FqObagdn8EBrFLdrUfJVAFHMyph2=YXUDWtExg@mail.gmail.com>

This should work as long as you don't write too much stuff without
giving ZLE a chance to read it.

    # After executing this, you can write stuff to file descriptor $zle_msg_fd
    # and it'll be shown in the ZLE status line.
    #
    #   echo "Hello World" >&$zle_msg_fd
    #   ( echo 'Hello'; sleep 1; echo 'World' ) >&$zle_msg_fd &!
    () {
      emulate -L zsh && setopt err_return
      local fifo && fifo=$(mktemp -u "${TMPDIR:-/tmp}"/fifo.XXXXXXXXXX)
      mkfifo $fifo
      exec {zle_msg_fd} <> $fifo
      rm $fifo
      function _zle_msg_process() {
        emulate -L zsh
        while IFS='' read -r -u $zle_msg_fd line && zle -M $line
      }
      zle -F $zle_msg_fd _zle_msg_process
    }

Roman.

On Sat, Jun 22, 2019 at 7:18 PM Sebastian Gniazdowski
<sgniazdowski@gmail.com> wrote:
>
> Hello,
> I've forged as I think an interesting function, which will display
> given message under the prompt regardless if ran from within zle or
> not. It uses the exec <(...) / zle -F trick to dispatch a callback
> that does have the zle active (zle -F -w isn't needed, zle -M works
> fine from no-widget callback):
>
> # deploy-message Hello world
> # deploy-message @sleep:5.5 "Hello world"
> deploy-message() {
>     [[ "$1" = <-> && ${#} -eq 1 ]] && { zle && {
>             local alltext text IFS=$'\n' nl=$'\n'
>             repeat 25; do read -u"$1" text; alltext+="${text:+$text$nl}"; done
>             [[ -n "$alltext" ]] && zle -M "$alltext"
>         }
>         zle -F "$1"; exec {1}<&-
>         return 0
>     }
>     local THEFD
>     # The expansion is: if there is @sleep: pfx, then use what's after
>     # it, otherwise substitute 0
>     exec {THEFD} < <(LANG=C sleep $(( 0.01 +
> ${${${(M)1#@sleep:}:+${1#@sleep:}}:-0} )); print -r --
> ${1:#(@msg|@sleep:*)} "${@[2,-1]}")
>     zle -F "$THEFD" -deploy-message
> }
>
> There's a gist with the function as well, in case of any updates:
> https://gist.github.com/psprint/b6503c0c37de483f68d055e9c47981b3
> --
> Sebastian Gniazdowski
> News: https://twitter.com/ZdharmaI
> IRC: https://kiwiirc.com/client/chat.freenode.net:+6697/#zplugin
> Blog: http://zdharma.org

  reply	other threads:[~2019-06-22 17:45 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-06-22 17:17 Sebastian Gniazdowski
2019-06-22 17:45 ` Roman Perepelitsa [this message]
2019-06-22 20:49   ` Sebastian Gniazdowski
2019-06-22 21:17     ` Roman Perepelitsa
2019-06-22 21:19       ` Roman Perepelitsa
2019-06-22 21:31       ` Sebastian Gniazdowski

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