Re: Enable compgen even when programmable completions are not available?

[of1]

On 27/06/2023 21:05, Kerin Millar wrote:
> It doesn't work at all for >=5.2. The reason for this is interesting and I may 
> make a separate post about it.
>
> Prior to 5.2, it can easily be tricked into printing names that do not exist.
>
> $ VAR=$'\nNONEXISTENT=' ./declare-P | grep ^NONEXISTENT
> NONEXISTENT
Thank you. I was just reading the discussion in Gentoo forum and
realizing that I've been to quickly: it doesn't pass the
FOO=$'\nBAR BAZ QUUX=' test. But what about this? (I also quickly
tested with Bash 5.2.15).


FOO=$'\nBAR BAZ QUUX='
VAR=$'\nNONEXISTENT='

declare-P() {
   local curVar
   declare -a curVars

   readarray -t curVars <<<"$1"
   curVars=( "${curVars[@]%%=*}" )
   curVars=( "${curVars[@]##* }" )
   for curVar in "${curVars[@]}"; do
      ### we can use [[ -v "$curVar" ]] at some point!
      [[ "${curVar//[a-zA-Z0-9_]}" || \
         "${curVar:0:1}" == [0-9] || \
         ! -v "$curVar" || \
         ! "$curVar" =~ $2 ]] || printf '%s\n' "$curVar"
   done
}

declare-P "$(declare -p)"
echo "##################"
declare-P "$(declare -p)" "QU|^NON|VAR"