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

[Sebastian Gniazdowski <sgniazdowski@gmail.com>]

On Sat, 22 Jun 2019 at 19:45, Roman Perepelitsa
<roman.perepelitsa@gmail.com> wrote:
>
> 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.

The command line seems to be blcoked after first using the descriptor.

>     #   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

-- 
Sebastian Gniazdowski
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