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From: Sebastian Gniazdowski <sgniazdowski@gmail.com>
Date: Sun, 20 May 2018 15:59:49 +0200
Message-ID: <CAKc7PVCu=trXd9WhkH13pq9DaDt5UtpMDA8YBbNA7b6r5YtwVQ@mail.gmail.com>
Subject: Fun thing, manual execution of $( ) command substitution
To: Zsh Users <zsh-users@zsh.org>
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Hello,
I wrote an ini parser and it allows to put $(...) in the content
because of following function. It isn't a rocket science, and doesn't
much parse to resolve $( echo "$( )" ) cases, but I think that
animating plain-text files is something interesting. Maybe someone has
other such tricks up sleeve?

The function will replace any $( ... ) in given buffer, with
stdout-result of command inside the parentheses, and return new buffer
in REPLY. It uses extended glob. Somewhat robust =E2=80=93 handles $(echo \=
)).

function subst_cmds {
    local buffer=3D"$1" nul=3D$'\0'
    local -a cmds

    cmds=3D( ${(0)${(S)buffer//(#b)*\$\((?#)([^\\]\))/${match[1]}${match[2]=
%\)}${nul}}%$nul*}
)

    [[ "${cmds[1]}" =3D "$buffer" ]] && return 0

    integer size=3D"${#cmds}" i
    local -a outputs

    for (( i =3D 1; i <=3D size; ++ i )); do
        outputs[i]=3D"$( ${(z)cmds[i]} )"
    done

    i=3D0
    REPLY=3D"${(S)buffer//(#b)\$\((?#)([^\\]\))/${outputs[++i]}}"

    return 0
}

--=20
Best regards,
Sebastian Gniazdowski