I have adapted some code I had to handle just a single possible option. Either run the function or use the help option to give a brief description.
activate-jet ()
{
local iarg=0 narg="$#"
while (( narg > 0 )); do
opt="$1" ; iarg=$(( iarg + 1 ))
case $opt in
("-h"|"--help") echo "TODO" ; return ;;
(*) break ;;
esac
done
}
I would like to simplify it more if I can, without introducing any strange behaviour by the user when called.
This is a possibility, since you state that you only need one argument, therefore there's no need for looping or "casing":
$ activate_jet() {
[[ "$#" -gt 1 ]] && echo "Invalid number of arguments" && return
if [[ ! -z "$1" ]]; then
if [[ "$1" = "-h" || "$1" = "--help" ]]; then
echo "TODO" && return
else
echo "Bad argument" && return
fi
fi
echo "jet activated"
}
$ activate_jet foo bar
Invalid number of arguments
$ activate_jet foo
Bad argument
$ activate_jet -h
TODO
$ activate_jet --help
TODO
$ activate_jet
jet activated
Now note that I changed the name of the function replacing the hyphen for an underscore: activate_jet instead of activate-jet, because the hyphen may not be compatible with some shells:
Conclusions
- Hyphens are non-standard. Stay away from them if you want cross-shell compatibility.
- Use underscores instead of hyphens: underscores are accepted everywhere.
