Re: A function to display message under the prompt without zle active

[Roman Perepelitsa <roman.perepelitsa@xxxxxxxxx>]

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@xxxxxxxxx> 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
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