/
utils.go
103 lines (95 loc) · 2.66 KB
/
utils.go
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package upctl
import (
"fmt"
"reflect"
"strings"
"github.com/gobeam/stringy"
"github.com/shopspring/decimal"
)
type FlagSet interface {
StringVarP(ptr *string, name, shorthand, value, usage string)
Int64VarP(ptr *int64, name, shorthand string, value int64, usage string)
Float64VarP(ptr *float64, name, shorthand string, value float64, usage string)
BoolVarP(ptr *bool, name, shorthand string, value bool, usage string)
StringSliceVarP(ptr *[]string, name, shorthand string, value []string, usage string)
}
func Bind(fs FlagSet, obj any) error {
v := reflect.ValueOf(obj)
for v.Kind() == reflect.Ptr {
v = v.Elem()
}
t := v.Type()
for i := 0; i < t.NumField(); i++ {
tf := t.Field(i)
if _, skip := tf.Tag.Lookup("skip"); skip {
continue
}
vf := v.FieldByName(tf.Name)
if tf.Type.Kind() == reflect.Ptr && vf.IsNil() {
continue
}
flag, short, usage := tf.Tag.Get("flag"), tf.Tag.Get("short"), tf.Tag.Get("usage")
if flag == "" {
if strings.HasSuffix(t.PkgPath(), "/pkg/upapi") {
if tf.Name == "PK" {
continue
}
if tf.Name == "URL" {
continue
}
}
flag = stringy.New(tf.Name).KebabCase().ToLower()
}
switch {
default:
return fmt.Errorf("unsupported field kind: %v", tf.Type.Kind())
case t.Field(i).Type.Kind() == reflect.String:
ptr, val := ptrVal[string](vf)
fs.StringVarP(ptr, flag, short, val, usage)
case t.Field(i).Type.Kind() == reflect.Int64:
ptr, val := ptrVal[int64](vf)
fs.Int64VarP(ptr, flag, short, val, usage)
case t.Field(i).Type.Kind() == reflect.Float64:
ptr, val := ptrVal[float64](vf)
fs.Float64VarP(ptr, flag, short, val, usage)
case t.Field(i).Type.Kind() == reflect.Bool:
ptr, val := ptrVal[bool](vf)
fs.BoolVarP(ptr, flag, short, val, usage)
case t.Field(i).Type.Kind() == reflect.Slice && t.Field(i).Type.Elem().Kind() == reflect.String:
ptr, val := ptrVal[[]string](vf)
fs.StringSliceVarP(ptr, flag, short, val, usage)
// recurse into structs and pointers
case t.Field(i).Type.Kind() == reflect.Ptr:
x := vf.Interface()
if err := Bind(fs, x); err != nil {
return err
}
case t.Field(i).Type.Kind() == reflect.Struct:
if tf.Type == reflect.TypeOf(decimal.Decimal{}) {
// TODO: implement
continue
}
x := vf.Addr().Interface()
if err := Bind(fs, x); err != nil {
return err
}
}
}
return nil
}
func ptrVal[T any](v reflect.Value) (ptr *T, val T) {
ptr = v.Addr().Interface().(*T)
val = v.Interface().(T)
return
}
func ptr[T any](v T) *T {
return &v
}
func parsePK(s string) (int64, error) {
var pk int64
_, err := fmt.Sscanf(s, "%d", &pk)
if err != nil {
return 0, fmt.Errorf("invalid PK: %s", s)
}
return pk, nil
}