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

[alex xmb ratchev]

On Mon, Jun 26, 2023, 00:25 Eli Schwartz <eschwartz93@gmail.com> wrote:

> compgen is a useful builtin for inspecting information about the shell
> context e.g. in scripts -- a good example of this is compgen -A function
> or compgen -A variable.
>
> But it's not always available depending on how bash is built, which
> results in people lacking confidence that it can / should be used in
> scripts. See e.g. https://bugs.gentoo.org/909148


i read kerin s try to parse declare -p

for me it works ..

bash-5.2$ { FOO=$'\nBAR BAZ QUUX='; declare -p; } |
while IFS=' =' read -r _ _ name _; do printf '%s\n' "$name"; done |
grep QUUX
bash-5.2$ echo $?
1
bash-5.2$

i ve experienced many changes in ' works ' bash code


> Would it be possible to have a slightly more minimal version of it with
> readline functionality and "currently inside programmable completions"
> functionality stripped out, which just allows it to be used for general
> environment introspection?
>
> An alternative for compgen -A function does exist -- declare -F in
> combination with e.g. sed. Variables is harder since AFAICT the only way
> to print all of them prints multiline values too (declare -p is similar
> to declare -f, there is no declare -P similar to declare -F, using
> ${!a@} to expand variable names does not work generically enough since
> you need to specify a prefix -- ${!@} won't expand all of them).
>


subst directives only fullfill one thing alone
per $@ , loop


> --
> Eli Schwartz
>
>