BASH function to make the user select a directory in $PATH.

select_path_dir.sh

function select_path {
    # BASH function to make the user select a directory in $PATH.
    # Outputs the path on success, returns 1 on error, and 2 when
    # no path is selected.
    # Arguments:
    #     $1 : Prompt for the select menu.
    #          Default: "Choose the installation path:"
    # Example usage:
    # if mypath="$(select_path)"; then
    #     echo "Success: $mypath"
    # else
    #     echo "No path selected."
    local pathdirs=($(printf "%s" "${PATH//:/$'\n'}" | sort))
    ((${#pathdirs} > 0)) || {
        printf "Failed to find \$PATH directories!\n" 1>&2
        return 1
    }
    PS3=$'\n'"Type \`c\` to cancel."$'\n'"${1:-Choose the installation path:} "
    local usepath
    select usepath in "${pathdirs[@]}"; do
        case "${#usepath}" in
            0 )
                return 2
                ;;
            * )
                printf "%s" "$usepath"
                break
                ;;
        esac
    done
}