Prevent error if !OPTIND is unbound #18
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This PR clears OPTARG (as opposed to `unset OPTARG`) for a valid long option without a required argument (e.g. `--charlie`). I believe this matches the behavior of builtin `getopts` for valid short options without an argument.
Clear vs. unset OPTARG for valid long option without argument
Fix default argument logic
Redeclare OPTARG instead of clear
Check if !OPTIND is unbound
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This PR adds a check that prevents an error when nounset is enabled (
set -u) and!OPTINDis unbound, i.e. when there are no more arguments left to process andgetopts_longencounters a final option that is missing a required argument. This matches the behavior of the builtingetoptscommand.