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package options
import (
"flag"
"fmt"
)
const (
DefaultString = "default string"
DefaultUint64 = 18446744073709551615
)
// New initializes a flag set using the provided arguments.
//
// - args should start with the (sub)command's name
// - usage is a function that prints a usage message
// - set is a function that sets the command's flag arguments
//
func New(args []string, usage func(), set func(*flag.FlagSet)) *flag.FlagSet {
if len(args) == 0 {
args = append(args, "")
}
fs := flag.NewFlagSet(args[0], flag.ExitOnError)
fs.Usage = func() {
usage()
}
set(fs)
fs.Parse(args[1:])
return fs
}
// AddString adds a string option to a flag set
func AddString(fs *flag.FlagSet, opt *string, short, long, value string) {
fs.StringVar(opt, short, value, "")
fs.StringVar(opt, long, value, "")
}
// AdUint64 adds an uint64 option to a flag set
func AddUint64(fs *flag.FlagSet, opt *uint64, short, long string, value uint64) {
fs.Uint64Var(opt, short, value, "")
fs.Uint64Var(opt, long, value, "")
}
// CheckString checks that a string option has a non-default value
func CheckString(optionName, value string, err error) error {
if err != nil {
return err
}
if value == DefaultString {
return fmt.Errorf("%s is a required option", optionName)
}
return nil
}
// CheckUint checks that an uint64 option has a non-default value
func CheckUint64(optionName string, value uint64, err error) error {
if err != nil {
return err
}
if value == DefaultUint64 {
return fmt.Errorf("%s is a required option", optionName)
}
return nil
}
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