(#59) Support IsSetByUser() for Arguments

args.go

@@ -75,6 +75,7 @@ type ArgClause struct {
 	hidden        bool
 	required      bool
 	validator     OptionValidator
+	setByUser     *bool
 }
 
 func newArg(name, help string) *ArgClause {
@@ -147,6 +148,21 @@ func (a *ArgClause) Required() *ArgClause {
 	return a
 }
 
+// IsSetByUser let to know if the flag was set by the user
+func (a *ArgClause) IsSetByUser(setByUser *bool) *ArgClause {
+	if setByUser != nil {
+		*setByUser = false
+	}
+	a.setByUser = setByUser
+	return a
+}
+
+func (a *ArgClause) isSetByUser() {
+	if a.setByUser != nil {
+		*a.setByUser = true
+	}
+}
+
 // Default values for this argument. They *must* be parseable by the value of the argument.
 func (a *ArgClause) Default(values ...string) *ArgClause {
 	a.defaultValues = values

args_test.go

@@ -82,3 +82,37 @@ func TestSubcommandArgRequiredWithEnvar(t *testing.T) {
 	assert.NoError(t, err)
 	assert.Equal(t, 123, *flag)
 }
+
+func TestArgIsSetByUser(t *testing.T) {
+	app := newTestApp()
+	var isSet bool
+	var b bool
+	app.Arg("b", "").IsSetByUser(&isSet).Required().BoolVar(&b)
+	_, err := app.Parse([]string{"true"})
+	assert.NoError(t, err)
+	assert.True(t, b)
+	assert.True(t, isSet)
+
+	isSet = false
+	b = false
+	_, err = app.Parse([]string{})
+	assert.Error(t, err)
+	assert.False(t, b)
+	assert.False(t, isSet)
+
+	app = newTestApp()
+	app.Arg("b", "").BoolVar(&b)
+	isSet = false
+	_, err = app.Parse([]string{"false"})
+	assert.NoError(t, err)
+	assert.False(t, b)
+	assert.False(t, isSet)
+
+	app = newTestApp()
+	app.Arg("b", "").Default("false").BoolVar(&b)
+	isSet = false
+	_, err = app.Parse([]string{})
+	assert.NoError(t, err)
+	assert.False(t, b)
+	assert.False(t, isSet)
+}

flags_test.go

@@ -369,7 +369,7 @@ func TestCombinationEnumOptions(t *testing.T) {
 
 }
 
-func TestIsSetByUser(t *testing.T) {
+func TestFlagIsSetByUser(t *testing.T) {
 	app := newTestApp()
 	var isSet bool
 	b := app.Flag("b", "").IsSetByUser(&isSet).Bool()

go.mod

@@ -4,7 +4,7 @@ go 1.23.0
 
 require (
 	github.com/stretchr/testify v1.10.0
-	golang.org/x/text v0.23.0
+	golang.org/x/text v0.24.0
 )
 
 require (

go.sum

@@ -4,8 +4,8 @@ github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZb
 github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
 github.com/stretchr/testify v1.10.0 h1:Xv5erBjTwe/5IxqUQTdXv5kgmIvbHo3QQyRwhJsOfJA=
 github.com/stretchr/testify v1.10.0/go.mod h1:r2ic/lqez/lEtzL7wO/rwa5dbSLXVDPFyf8C91i36aY=
-golang.org/x/text v0.23.0 h1:D71I7dUrlY+VX0gQShAThNGHFxZ13dGLBHQLVl1mJlY=
-golang.org/x/text v0.23.0/go.mod h1:/BLNzu4aZCJ1+kcD0DNRotWKage4q2rGVAg4o22unh4=
+golang.org/x/text v0.24.0 h1:dd5Bzh4yt5KYA8f9CJHCP4FB4D51c2c6JvN37xJJkJ0=
+golang.org/x/text v0.24.0/go.mod h1:L8rBsPeo2pSS+xqN0d5u2ikmjtmoJbDBT1b7nHvFCdU=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405 h1:yhCVgyC4o1eVCa2tZl7eS0r+SDo693bJlVdllGtEeKM=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=

parser.go

@@ -354,6 +354,7 @@ loop:
 					break loop
 				}
 				context.matchedArg(arg, token.String())
+				arg.isSetByUser()
 				context.Next()
 			} else {
 				break loop