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pflag.go
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pflag.go
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package panylcli
import (
"fmt"
"reflect"
"github.com/spf13/pflag"
)
func ParseFlags(flags *pflag.FlagSet, out interface{}) error {
structType := reflect.TypeOf(out)
if structType.Kind() != reflect.Ptr {
return fmt.Errorf("must pass a pointer")
}
structVal := structType.Elem()
if structVal.Kind() != reflect.Struct {
return fmt.Errorf("must pass a struct")
}
structPointer := reflect.ValueOf(out).Elem()
for i := 0; i < structVal.NumField(); i++ {
field := structVal.Field(i)
tag := field.Tag.Get("flag")
if tag != "" {
fieldPointer := structPointer.FieldByName(field.Name)
if !fieldPointer.CanSet() {
continue
}
var value interface{}
var err error
switch field.Type.Kind() {
case reflect.Bool:
value, err = flags.GetBool(tag)
case reflect.Int:
value, err = flags.GetInt(tag)
case reflect.Int8:
value, err = flags.GetInt8(tag)
case reflect.Int16:
value, err = flags.GetInt16(tag)
case reflect.Int32:
value, err = flags.GetInt32(tag)
case reflect.Int64:
value, err = flags.GetInt64(tag)
case reflect.Uint:
value, err = flags.GetUint(tag)
case reflect.Uint8:
value, err = flags.GetUint8(tag)
case reflect.Uint16:
value, err = flags.GetUint16(tag)
case reflect.Uint32:
value, err = flags.GetUint32(tag)
case reflect.Uint64:
value, err = flags.GetUint64(tag)
case reflect.Float32:
value, err = flags.GetFloat32(tag)
case reflect.Float64:
value, err = flags.GetFloat64(tag)
case reflect.String:
value, err = flags.GetString(tag)
default:
err = fmt.Errorf("unsupported flag type '%s'", field.Type.Name())
}
if err != nil {
return err
}
fieldPointer.Set(reflect.ValueOf(value))
}
}
return nil
}