A function to display message under the prompt without zle active

[Sebastian Gniazdowski <sgniazdowski@gmail.com>]

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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