Add command set and move help and version flags to global flags default set

command.go

@@ -8,13 +8,13 @@ import (
 )
 
 type Command struct {
-	Name             string
-	ShortDescription string
-	LongDescription  string
+	name             string
+	shortDescription string
+	longDescription  string
 	aliases          []string
 	arguments        []*Argument
 	flags            flags.Set
-	subcommands      []*Command
+	subcommands      Set
 	parent           *Command
 	run              func(args []string)
 	isRoot           bool
@@ -27,7 +27,7 @@ func NewRoot(options ...Option) *Command {
 }
 
 func New(name string, options ...Option) *Command {
-	cmd := &Command{Name: name}
+	cmd := &Command{name: name}
 	cmd.ApplyOptions(options...)
 	return cmd
 }
@@ -43,7 +43,7 @@ func (c *Command) CommandPath() string {
 		return filepath.Base(os.Args[0])
 	}
 
-	return c.parent.CommandPath() + " " + c.Name
+	return c.parent.CommandPath() + " " + c.name
 }
 
 func (c *Command) CanRun() bool {
@@ -65,18 +65,10 @@ func (c *Command) Execute(args []string) {
 	}
 
 	if len(args) > 0 {
-		for _, subcommand := range c.subcommands {
-			if subcommand.Name == args[0] {
-				subcommand.Execute(args[1:])
-				return
-			}
-
-			for _, alias := range subcommand.aliases {
-				if alias == args[0] {
-					subcommand.Execute(args[1:])
-					return
-				}
-			}
+		sc, ok := c.subcommands.Get(args[0])
+		if ok {
+			sc.Execute(args[1:])
+			return
 		}
 
 		// TODO: remove when done with flag parsing

flags/global.go

@@ -1,6 +1,9 @@
 package flags
 
-var globalFlags Set
+var globalFlags = Set{
+	Bool("help", "h", false, "Show the help menu"),
+	Bool("version", "v", false, "Show the app version"),
+}
 
 func Global(fs ...Flag) {
 	globalFlags = append(globalFlags, fs...)

flags/set.go

@@ -6,8 +6,8 @@ func NewSet() Set {
 	return Set{}
 }
 
-func (s Set) Add(f Flag) Set {
-	return append(s, f)
+func (s *Set) Add(f Flag) {
+	*s = append(*s, f)
 }
 
 func (s Set) Get(name string) (Flag, bool) {

help.go

@@ -9,7 +9,7 @@ import (
 func (c *Command) ShowHelp() {
 	cmdPath := c.CommandPath()
 
-	fmt.Println(c.LongDescription)
+	fmt.Println(c.longDescription)
 	fmt.Println()
 	fmt.Println("Usage: ")
 	fmt.Printf("  %s ", cmdPath)
@@ -34,7 +34,7 @@ func (c *Command) ShowHelp() {
 		}
 
 		for _, s := range c.subcommands {
-			fmt.Println("  " + s.Name + "    " + s.ShortDescription)
+			fmt.Println("  " + s.name + "    " + s.shortDescription)
 		}
 	}
 
@@ -46,8 +46,15 @@ func (c *Command) ShowHelp() {
 		fmt.Println("  " + flags.HelpLine(f, paddedWidth))
 	}
 
-	fmt.Println("  -h, --help       Show the help menu")
-	fmt.Println("  -v, --version    Show the app version")
+	globalFlags := flags.Globals()
+	if len(globalFlags) > 0 {
+		paddedWidth = globalFlags.MaxWidth()
+		fmt.Println()
+		fmt.Println("Global flags:")
+		for _, f := range globalFlags {
+			fmt.Println("  " + flags.HelpLine(f, paddedWidth))
+		}
+	}
 
 	if len(c.subcommands) > 0 {
 		fmt.Println()

option.go

@@ -6,13 +6,13 @@ type Option func(*Command)
 
 func WithShortDescription(s string) Option {
 	return func(c *Command) {
-		c.ShortDescription = s
+		c.shortDescription = s
 	}
 }
 
 func WithLongDescription(s string) Option {
 	return func(c *Command) {
-		c.LongDescription = s
+		c.longDescription = s
 	}
 }
 
@@ -42,21 +42,24 @@ func WithFlags(fs ...flags.Flag) Option {
 
 func WithSubcommand(s *Command) Option {
 	return func(c *Command) {
-		c.subcommands = append(c.subcommands, s)
+		c.subcommands.Add(c)
 		s.parent = c
 	}
 }
 
 func WithSubcommands(ss ...*Command) Option {
 	return func(c *Command) {
-		c.subcommands = append(c.subcommands, ss...)
+		c.subcommands.Add(c)
+		for _, s := range ss {
+			s.parent = c
+		}
 	}
 }
 
 func WithParent(p *Command) Option {
 	return func(c *Command) {
 		c.parent = p
-		p.subcommands = append(p.subcommands, c)
+		p.subcommands.Add(c)
 	}
 }
 

set.go

@@ -0,0 +1,40 @@
+package cmd
+
+type Set []*Command
+
+func NewSet() Set {
+	return Set{}
+}
+
+func (s *Set) Add(c *Command) {
+	*s = append(*s, c)
+}
+
+func (s Set) Get(name string) (*Command, bool) {
+	for _, c := range s {
+		if c.name == name {
+			return c, true
+		}
+
+		for _, alias := range c.aliases {
+			if alias == name {
+				return c, true
+			}
+		}
+	}
+	return nil, false
+}
+
+func (s Set) MaxNameWidth() int {
+	max := 0
+	for _, f := range s {
+		if w := len(f.name); w > max {
+			max = w
+		}
+	}
+	return max
+}
+
+func (s Set) Len() int {
+	return len(s)
+}