Allow to sort commands by category

app.go

@@ -34,6 +34,10 @@ type App struct {
 	HideHelp bool
 	// Boolean to hide built-in version flag
 	HideVersion bool
+	// Display commands by category
+	CategorizedHelp bool
+	// Populate when displaying AppHelp
+	Categories map[string]Commands
 	// An action to execute when the bash-completion flag is set
 	BashComplete func(context *Context)
 	// An action to execute before any subcommands are run, but after the context is ready
@@ -95,6 +99,13 @@ func (a *App) Run(arguments []string) (err error) {
 		a.Authors = append(a.Authors, Author{Name: a.Author, Email: a.Email})
 	}
 
+	if a.CategorizedHelp {
+		a.Categories = make(map[string]Commands)
+		for _, command := range a.Commands {
+			a.Categories[command.Category] = append(a.Categories[command.Category], command)
+		}
+	}
+
 	newCmds := []Command{}
 	for _, c := range a.Commands {
 		if c.HelpName == "" {

command.go

@@ -22,6 +22,8 @@ type Command struct {
 	Description string
 	// A short description of the arguments of this command
 	ArgsUsage string
+	// The category the command is part of
+	Category string
 	// The function to call when checking for bash command completions
 	BashComplete func(context *Context)
 	// An action to execute before any sub-subcommands are run, but after the context is ready
@@ -37,7 +39,7 @@ type Command struct {
 	// If this function is not set, the "Incorrect usage" is displayed and the execution is interrupted.
 	OnUsageError func(context *Context, err error) error
 	// List of child commands
-	Subcommands []Command
+	Subcommands Commands
 	// List of flags to parse
 	Flags []Flag
 	// Treat all flags as normal arguments if true
@@ -59,6 +61,8 @@ func (c Command) FullName() string {
 	return strings.Join(c.commandNamePath, " ")
 }
 
+type Commands []Command
+
 // Invokes the command given the context, parses ctx.Args() to generate command-specific flags
 func (c Command) Run(ctx *Context) (err error) {
 	if len(c.Subcommands) > 0 {

help.go

@@ -23,9 +23,12 @@ VERSION:
 AUTHOR(S):
    {{range .Authors}}{{ . }}{{end}}
    {{end}}{{if .Commands}}
-COMMANDS:
-   {{range .Commands}}{{join .Names ", "}}{{ "\t" }}{{.Usage}}
-   {{end}}{{end}}{{if .Flags}}
+COMMANDS:{{if .CategorizedHelp}}{{range $category, $commands := .Categories}}{{if $category}}
+  {{$category}}{{ ":" }}{{end}}{{range $commands}}
+    {{.Name}}{{with .ShortName}}, {{.}}{{end}}{{ "\t" }}{{.Usage}}{{end}}
+{{end}}{{else}}{{range .Commands}}
+   {{.Name}}{{with .ShortName}}, {{.}}{{end}}{{ "\t" }}{{.Usage}}{{end}}
+{{end}}{{end}}{{if .Flags}}
 GLOBAL OPTIONS:
    {{range .Flags}}{{.}}
    {{end}}{{end}}{{if .Copyright }}
@@ -43,6 +46,9 @@ var CommandHelpTemplate = `NAME:
 USAGE:
    {{.HelpName}}{{if .Flags}} [command options]{{end}} {{if .ArgsUsage}}{{.ArgsUsage}}{{else}}[arguments...]{{end}}{{if .Description}}
 
+{{if .Category}}CATEGORY:
+   {{.Category}}
+{{end}}
 DESCRIPTION:
    {{.Description}}{{end}}{{if .Flags}}