bash: exit from source-d script

It seems there could be 2 parts to this. The first is to know when you're executing in a sourced script instead of an executed one. That can be found in this answer, and for bash they suggest:

[[ "$0" != "$BASH_SOURCE" ]] && sourced=1 || sourced=0

to tell whether or not you are being sourced.

If you are being sourced, you'd want to use return instead of exit.

You could store that function in a variable with something like

if [[ $sourced -eq 1 ]]; then
    ret=return
else
    ret=exit
fi

and then when you want to use the appropriate one you'd just use

$ret 1

Define:

[[ "$0" == "$BASH_SOURCE" ]] && ret=exit || ret=return

Use:

$ret 1