Re: @K transformation

[Léa Gris]

Le 19/08/2021 à 12:09, Koichi Murase écrivait :

> $ printf '<%s>\n' "${A[@]@A}"
> <declare>
> <-A>
> <A=([adsf]="456 789" ["foo bar"]="123 456" )>
>
> The problem of ${A[@]@A} is that it is not so useful when one wants to
> define a clone associative array with a different name but with the
> same contents as A. Instead, using ${A[@]@K}, one could do
>
> $ declare -A "B=(${A[@]@K})"
>
> to clone the associative array. It is even possible to save the
> contents of an associative array in an indexed array as
>
> $ declare -a "saved=(${A[@]@K})"
>
> Hmm..., but for this case, one could actually simply store the
> contents in a scalar:
>
> $ saved="${A[*]@K}"

Current implementation of @K is pretty-much useless for the dialog use-case:

> #!/usr/bin/env bash
>
> declare -A assoc=(
>   [P]=piano
>   [TB]='foldable table'
>   ['CH AIR']=chair
> )
>
> options=("${assoc[@]@K}")
>
> #typeset -p options
> #exit
>
> choice="$(
>   dialog \
>     --backtitle "Test" \
>     --title "Test" \
>     --menu "Test" \
>     0 0 4 \
>     "${options[@]}" \
>     2>&1 >/dev/tty
> )"

Inline with "${array[@]}" expanding as multiple arguments!

"${assoc[@]@K}" shall have expanded into arguments and not expand quotes 
as string content.

This would have made the @K expansion usable for dialog.

Currently the associative array's key values pairs need be added to the 
options array in a for loop as:

> options=()
>
> for k in "${!assoc[@]}"; do
>   options+=("$k" "${assoc[$k]}")
> done


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