initial import

Signed-off-by: Vasiliy Tolstov <v.tolstov@unistack.org>

flag_test.go

@@ -0,0 +1,49 @@
+package flag
+
+import (
+	"flag"
+	"os"
+	"reflect"
+	"strconv"
+	"testing"
+
+	rutil "github.com/unistack-org/micro/v3/util/reflect"
+)
+
+func TestLoad(t *testing.T) {
+	os.Args = append(os.Args, "-broker", "5566:33")
+	type config struct {
+		Broker  string `flag:"name=broker,desc='description with, comma',default='127.0.0.1:9092'"`
+		Verbose bool   `flag:"name=verbose,desc='verbose output',default='false value'"`
+	}
+
+	cfg := &config{}
+
+	fields, err := rutil.StructFields(cfg)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	for _, sf := range fields {
+		tf, ok := sf.Field.Tag.Lookup("flag")
+		if !ok {
+			continue
+		}
+		fn, fv, fd := getFlagOpts(tf)
+
+		switch sf.Value.Kind() {
+		case reflect.String:
+			v := sf.Value.Addr().Interface().(*string)
+			flag.StringVar(v, fn, fv, fd)
+		case reflect.Bool:
+			v := sf.Value.Addr().Interface().(*bool)
+			i, _ := strconv.ParseBool(fv)
+			flag.BoolVar(v, fn, i, fd)
+		}
+	}
+
+	flag.Parse()
+	if cfg.Broker != "5566:33" {
+		t.Fatalf("failed to parse flags broker value invalid: %#+v", cfg)
+	}
+}