36 lines
554 B
Go
36 lines
554 B
Go
package flags
|
|
|
|
import (
|
|
"fmt"
|
|
"strings"
|
|
)
|
|
|
|
type Arg struct {
|
|
Val string
|
|
Help string
|
|
}
|
|
|
|
// type constraint
|
|
type Val interface {
|
|
string | bool
|
|
}
|
|
|
|
// with generic Val field, instantiate like Flag[string]
|
|
type Flag[V Val] struct {
|
|
Long string
|
|
Short string
|
|
Val V
|
|
Help string
|
|
}
|
|
|
|
func HasDashPrefix(s string) bool {
|
|
return strings.HasPrefix(s, "-")
|
|
}
|
|
|
|
func MissingValueArg(args []string, i int) bool {
|
|
return i+1 == len(args) || HasDashPrefix(args[i+1])
|
|
}
|
|
|
|
func HelpMissingVal(flag string) {
|
|
fmt.Printf("%s needs a value assignment\n", flag)
|
|
}
|