Add more flag types and add flag set

command.go

@@ -13,7 +13,7 @@ type Command struct {
 	LongDescription  string
 	aliases          []string
 	arguments        []*Argument
-	flags            []flags.Flag
+	flags            flags.Set
 	subcommands      []*Command
 	parent           *Command
 	run              func(args []string)
@@ -59,6 +59,11 @@ func (c *Command) Execute(args []string) {
 		args = args[1:]
 	}
 
+	if err := c.flags.Parse(args); err != nil {
+		c.ShowHelp()
+		return
+	}
+
 	if len(args) > 0 {
 		for _, subcommand := range c.subcommands {
 			if subcommand.Name == args[0] {

flags/bool.go

@@ -0,0 +1,56 @@
+package flags
+
+import "strconv"
+
+type BoolFlag struct {
+	name        string
+	shortName   string
+	description string
+	value       bool
+}
+
+var _ Flag = (*StringFlag)(nil)
+
+func NewBoolFlag(name, shortName string, defaultValue bool, description string) *BoolFlag {
+	return &BoolFlag{
+		name:        name,
+		shortName:   shortName,
+		description: description,
+		value:       defaultValue,
+	}
+}
+
+// Description implements Flag.
+func (f *BoolFlag) Description() string {
+	return f.description
+}
+
+// Name implements Flag.
+func (f *BoolFlag) Name() string {
+	return f.name
+}
+
+// ShortName implements Flag.
+func (f *BoolFlag) ShortName() string {
+	return f.shortName
+
+}
+
+// Value implements Flag.
+func (f *BoolFlag) Parse(raw string) error {
+	if raw == "" {
+		return nil
+	}
+
+	boolVal, err := strconv.ParseBool(raw)
+	if err != nil {
+		return err
+	}
+
+	f.value = boolVal
+	return nil
+}
+
+func (f *BoolFlag) Value() bool {
+	return f.value
+}

flags/flag.go

@@ -4,5 +4,5 @@ type Flag interface {
 	Name() string
 	ShortName() string
 	Description() string
-	Parse(raw string) (any, error)
+	Parse(raw string) error
 }

flags/float.go

@@ -0,0 +1,56 @@
+package flags
+
+import "strconv"
+
+type FloatFlag struct {
+	name        string
+	shortName   string
+	description string
+	value       float64
+}
+
+var _ Flag = (*FloatFlag)(nil)
+
+func NewFloatFlag(name, shortName string, defaultValue float64, description string) *FloatFlag {
+	return &FloatFlag{
+		name:        name,
+		shortName:   shortName,
+		description: description,
+		value:       defaultValue,
+	}
+}
+
+// Description implements Flag.
+func (f *FloatFlag) Description() string {
+	return f.description
+}
+
+// Name implements Flag.
+func (f *FloatFlag) Name() string {
+	return f.name
+}
+
+// ShortName implements Flag.
+func (f *FloatFlag) ShortName() string {
+	return f.shortName
+
+}
+
+// Value implements Flag.
+func (f *FloatFlag) Parse(raw string) error {
+	if raw == "" {
+		return nil
+	}
+
+	floatVal, err := strconv.ParseFloat(raw, 64)
+	if err != nil {
+		return err
+	}
+
+	f.value = floatVal
+	return nil
+}
+
+func (f *FloatFlag) Value() float64 {
+	return f.value
+}

flags/global.go

@@ -0,0 +1,11 @@
+package flags
+
+var globalFlags Set
+
+func Global(fs ...Flag) {
+	globalFlags = append(globalFlags, fs...)
+}
+
+func Globals() Set {
+	return globalFlags
+}

flags/int.go

@@ -0,0 +1,56 @@
+package flags
+
+import "strconv"
+
+type IntFlag struct {
+	name        string
+	shortName   string
+	description string
+	value       int
+}
+
+var _ Flag = (*StringFlag)(nil)
+
+func NewIntFlag(name, shortName string, defaultValue int, description string) *IntFlag {
+	return &IntFlag{
+		name:        name,
+		shortName:   shortName,
+		description: description,
+		value:       defaultValue,
+	}
+}
+
+// Description implements Flag.
+func (f *IntFlag) Description() string {
+	return f.description
+}
+
+// Name implements Flag.
+func (f *IntFlag) Name() string {
+	return f.name
+}
+
+// ShortName implements Flag.
+func (f *IntFlag) ShortName() string {
+	return f.shortName
+
+}
+
+// Value implements Flag.
+func (f *IntFlag) Parse(raw string) error {
+	if raw == "" {
+		return nil
+	}
+
+	intVal, err := strconv.Atoi(raw)
+	if err != nil {
+		return err
+	}
+
+	f.value = intVal
+	return nil
+}
+
+func (f *IntFlag) Value() int {
+	return f.value
+}

flags/set.go

@@ -0,0 +1,29 @@
+package flags
+
+type Set []Flag
+
+func NewSet() Set {
+	return Set{}
+}
+
+func (s Set) Add(f Flag) Set {
+	return append(s, f)
+}
+
+func (s Set) Get(name string) (Flag, bool) {
+	for _, f := range s {
+		if f.Name() == name {
+			return f, true
+		}
+
+		if f.ShortName() == name {
+			return f, true
+		}
+	}
+	return nil, false
+}
+
+// TODO: Implement
+func (s Set) Parse(args []string) error {
+	return nil
+}

flags/string.go

@@ -9,7 +9,7 @@ type StringFlag struct {
 
 var _ Flag = (*StringFlag)(nil)
 
-func NewStringFlag(name, shortName, description, defaultValue string) *StringFlag {
+func NewStringFlag(name, shortName, defaultValue, description string) *StringFlag {
 	return &StringFlag{
 		name:        name,
 		shortName:   shortName,
@@ -35,14 +35,13 @@ func (f *StringFlag) ShortName() string {
 }
 
 // Value implements Flag.
-func (f *StringFlag) Parse(raw string) (any, error) {
+func (f *StringFlag) Parse(raw string) error {
 	if raw == "" {
-		return f.value, nil
+		return nil
 	}
 
 	f.value = raw
-
-	return raw, nil
+	return nil
 }
 
 func (f *StringFlag) Value() string {