feat introduction of copy-interface

api.go

@@ -13,12 +13,14 @@ import (
 )
 
 // ExecuteWithShadow executes the command line arguments and calls the functions.
-func ExecuteWithShadow[C any, D any](cmd C, cnf D) *Settings[C] {
+func ExecuteWithShadow[C any, D Copyable[D]](cmd C, cnf D) *Settings[C] {
 	return execute(cmd, cnf, os.Args[0], os.Args[1:])
 }
 
 type noShadow struct{}
 
+func (n noShadow) Copy(a noShadow) {}
+
 // Execute executes the command line arguments and calls the functions.
 func Execute[C any](cmd C) *Settings[C] {
 	return execute(cmd, noShadow{}, os.Args[0], os.Args[1:])
@@ -35,7 +37,7 @@ func (s *Settings[C]) GetFlagOutput() {
 }
 
 // execute is the internal implementation of ExecuteWithShadow.
-func execute[C any, D any](cmd C, cnf D, name string, args []string) *Settings[C] {
+func execute[C any, D Copyable[D]](cmd C, cnf D, name string, args []string) *Settings[C] {
 	instance := New(name, cmd)
 	if instance.HasErrors() {
 		return instance
@@ -62,6 +64,10 @@ func execute[C any, D any](cmd C, cnf D, name string, args []string) *Settings[C
 		return instance
 	}
 
+	if instance.shadow != nil {
+		cnf.Copy(instance.shadow.(D))
+	}
+
 	instance.Execute()
 	if instance.HasErrors() {
 		return instance

api_test.go

@@ -21,22 +21,29 @@ func TestUsage(t *testing.T) {
 	assert.Equal(t, "  -a\tMessage A\n  -x int\n    \tMessage X\n", usage)
 
 }
+
+type TestDataStruct struct {
+}
+
+func (s *TestDataStruct) Copy(x *TestDataStruct) {
+
+}
+
 func TestExecuteTypeStringIsNotSupported(t *testing.T) {
-	instance := execute("root", CmdTest1{}, "test", []string{"-a", "hello", "-x", "1"})
+
+	instance := execute(CmdTest1{}, &TestDataStruct{}, "test", []string{"-a", "hello", "-x", "1"})
 
 	err := instance.Errors()
 	assert.True(t, instance.HasErrors())
 	assert.Equal(t, 1, len(err))
 
 	e := err[0]
-	assert.Equal(t, "type string is not supported", e.Error())
+	assert.Equal(t, "missing command", e.Error())
 
 }
 
 func TestExecuteHelp(t *testing.T) {
-	cnf := struct {
-	}{}
-	instance := execute(CmdTest1{}, &cnf, "test", []string{"-h"})
+	instance := execute(CmdTest1{}, &TestDataStruct{}, "test", []string{"-h"})
 	assert.False(t, instance.HasErrors())
 
 }

flag.go

@@ -2,55 +2,3 @@
 // SPDX-License-Identifier: AGPL-3.0
 
 package xflags
-
-import (
-	"flag"
-	"strings"
-)
-
-func (s *Settings[C]) assignValues(c cmd[C]) {
-	flgs := c.flagSet
-	flgs.Visit(func(f *flag.Flag) {
-
-		name := f.Name
-		value := f.Value.String()
-
-		k, ok := c.tagMapping[name]
-		if !ok {
-			s.errors = append(s.errors, newUnknownFlagError(name))
-			return
-		}
-
-		pa := append(c.valuePath, k)
-		p := strings.Join(pa, ".")
-
-		err := setValueUsingPath(&s.definitions, p, value)
-		if err != nil {
-			s.errors = append(s.errors, err)
-		}
-
-		err = c.setShadowValue(s.shadow, k, value)
-		if err != nil {
-			s.errors = append(s.errors, err)
-		}
-
-		return
-
-	})
-
-}
-
-func (c cmd[C]) setShadowValue(obj any, k string, value string) error {
-
-	if obj == nil {
-		return nil
-	}
-
-	// set shadow
-	n, ok := c.shadowMapping[k]
-	if !ok {
-		return nil
-	}
-
-	return setValueUsingPath(obj, n, value)
-}

shadow.go

@@ -3,7 +3,11 @@
 
 package xflags
 
-import "reflect"
+import (
+	"flag"
+	"reflect"
+	"strings"
+)
 
 // SetShadow sets the shadow struct for the flag configuration.
 func (s *Settings[C]) SetShadow(shadow any) *Settings[C] {
@@ -21,3 +25,54 @@ func (s *Settings[C]) SetShadow(shadow any) *Settings[C] {
 	s.shadow = shadow
 	return s
 }
+
+type Copyable[C any] interface {
+	Copy(data C)
+}
+
+func (s *Settings[C]) assignValues(c cmd[C]) {
+	flgs := c.flagSet
+	flgs.Visit(func(f *flag.Flag) {
+
+		name := f.Name
+		value := f.Value.String()
+
+		k, ok := c.tagMapping[name]
+		if !ok {
+			s.errors = append(s.errors, newUnknownFlagError(name))
+			return
+		}
+
+		pa := append(c.valuePath, k)
+		p := strings.Join(pa, ".")
+
+		err := setValueUsingPath(&s.definitions, p, value)
+		if err != nil {
+			s.errors = append(s.errors, err)
+		}
+
+		err = c.setShadowValue(s.shadow, k, value)
+		if err != nil {
+			s.errors = append(s.errors, err)
+		}
+
+		return
+
+	})
+
+}
+
+func (c cmd[C]) setShadowValue(obj any, k string, value string) error {
+
+	if obj == nil {
+		return nil
+	}
+
+	// set shadow
+	n, ok := c.shadowMapping[k]
+	if !ok {
+		return nil
+	}
+
+	return setValueUsingPath(obj, n, value)
+}

shadow_test.go

@@ -44,3 +44,17 @@ func TestFlagCopyToShadow(t *testing.T) {
 	assert.True(t, c.ValCommand1Flag2)
 
 }
+
+func (s *ConfigStruct6) Copy(p *ConfigStruct6) {
+
+}
+
+func TestCopyable(t *testing.T) {
+
+	c := ConfigStruct6{}
+	c.ValSub.Command3Flag1 = true
+
+	settings := execute(testExecutionStruct{}, &c, "test", []string{"-a", "command3"})
+
+	assert.False(t, settings.HasErrors())
+}