feat: add env utils

internal/utils/env.go

@@ -0,0 +1,92 @@
+package utils
+
+import (
+	"fmt"
+	"reflect"
+	"strconv"
+)
+
+func MarshalEnv(instance interface{}) ([]string, error) {
+	v := reflect.ValueOf(instance)
+	if v.Kind() == reflect.Ptr {
+		if v.IsNil() {
+			return nil, fmt.Errorf("instance is nil")
+		}
+		v = v.Elem()
+	}
+
+	if v.Kind() != reflect.Struct {
+		return nil, fmt.Errorf("instance must be a struct or pointer to struct")
+	}
+
+	t := v.Type()
+	var result []string
+
+	for i := 0; i < v.NumField(); i++ {
+		field := t.Field(i)
+		fieldValue := v.Field(i)
+
+		// Get the env tag
+		envTag := field.Tag.Get("env")
+		if envTag == "" || envTag == "-" {
+			continue
+		}
+
+		// Skip unexported fields
+		if !fieldValue.CanInterface() {
+			continue
+		}
+
+		var valueStr string
+
+		// Handle different types
+		switch fieldValue.Kind() {
+		case reflect.Bool:
+			valueStr = strconv.FormatBool(fieldValue.Bool())
+
+		case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64:
+			valueStr = strconv.FormatUint(fieldValue.Uint(), 10)
+
+		case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
+			valueStr = strconv.FormatInt(fieldValue.Int(), 10)
+
+		case reflect.Float32, reflect.Float64:
+			valueStr = strconv.FormatFloat(fieldValue.Float(), 'f', -1, 64)
+
+		case reflect.String:
+			valueStr = fieldValue.String()
+
+		case reflect.Ptr:
+			if fieldValue.IsNil() {
+				continue // Skip nil pointers
+			}
+			elem := fieldValue.Elem()
+			// Handle *semver.Version and other pointer types
+			if elem.CanInterface() {
+				if stringer, ok := elem.Interface().(fmt.Stringer); ok {
+					valueStr = stringer.String()
+				} else {
+					valueStr = fmt.Sprintf("%v", elem.Interface())
+				}
+			} else {
+				valueStr = fmt.Sprintf("%v", elem.Interface())
+			}
+
+		default:
+			// For other types, try to convert to string
+			if fieldValue.CanInterface() {
+				if stringer, ok := fieldValue.Interface().(fmt.Stringer); ok {
+					valueStr = stringer.String()
+				} else {
+					valueStr = fmt.Sprintf("%v", fieldValue.Interface())
+				}
+			} else {
+				valueStr = fmt.Sprintf("%v", fieldValue.Interface())
+			}
+		}
+
+		result = append(result, fmt.Sprintf("%s=%s", envTag, valueStr))
+	}
+
+	return result, nil
+}

internal/utils/env_test.go

@@ -0,0 +1,57 @@
+package utils
+
+import (
+	"reflect"
+	"testing"
+
+	"github.com/Masterminds/semver/v3"
+)
+
+type nativeOptions struct {
+	Disable              bool            `env:"JETKVM_NATIVE_DISABLE"`
+	SystemVersion        *semver.Version `env:"JETKVM_NATIVE_SYSTEM_VERSION"`
+	AppVersion           *semver.Version `env:"JETKVM_NATIVE_APP_VERSION"`
+	DisplayRotation      uint16          `env:"JETKVM_NATIVE_DISPLAY_ROTATION"`
+	DefaultQualityFactor float64         `env:"JETKVM_NATIVE_DEFAULT_QUALITY_FACTOR"`
+}
+
+func TestMarshalEnv(t *testing.T) {
+	tests := []struct {
+		name     string
+		instance interface{}
+		want     []string
+		wantErr  bool
+	}{
+		{
+			name: "basic struct",
+			instance: nativeOptions{
+				Disable:              false,
+				SystemVersion:        semver.MustParse("1.1.0"),
+				AppVersion:           semver.MustParse("1111.0.0"),
+				DisplayRotation:      1,
+				DefaultQualityFactor: 1.0,
+			},
+			want: []string{
+				"JETKVM_NATIVE_DISABLE=false",
+				"JETKVM_NATIVE_SYSTEM_VERSION=1.1.0",
+				"JETKVM_NATIVE_APP_VERSION=1111.0.0",
+				"JETKVM_NATIVE_DISPLAY_ROTATION=1",
+				"JETKVM_NATIVE_DEFAULT_QUALITY_FACTOR=1",
+			},
+			wantErr: false,
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			got, err := MarshalEnv(tt.instance)
+			if (err != nil) != tt.wantErr {
+				t.Errorf("MarshalEnv() error = %v, wantErr %v", err, tt.wantErr)
+				return
+			}
+			if !reflect.DeepEqual(got, tt.want) {
+				t.Errorf("MarshalEnv() = %v, want %v", got, tt.want)
+			}
+		})
+	}
+}