Add groups for commands in help

Co-authored-by: Marc Khouzam <marc.khouzam@gmail.com>

README.md

@@ -23,6 +23,7 @@ Cobra provides:
 * Global, local and cascading flags
 * Intelligent suggestions (`app srver`... did you mean `app server`?)
 * Automatic help generation for commands and flags
+* Grouping help for subcommands
 * Automatic help flag recognition of `-h`, `--help`, etc.
 * Automatically generated shell autocomplete for your application (bash, zsh, fish, powershell)
 * Automatically generated man pages for your application

command.go

@@ -35,6 +35,12 @@ const FlagSetByCobraAnnotation = "cobra_annotation_flag_set_by_cobra"
 // FParseErrWhitelist configures Flag parse errors to be ignored
 type FParseErrWhitelist flag.ParseErrorsWhitelist
 
+// Structure to manage groups for commands
+type Group struct {
+	ID    string
+	Title string
+}
+
 // Command is just that, a command for your application.
 // E.g.  'go run ...' - 'run' is the command. Cobra requires
 // you to define the usage and description as part of your command
@@ -61,6 +67,9 @@ type Command struct {
 	// Short is the short description shown in the 'help' output.
 	Short string
 
+	// The group id under which this subcommand is grouped in the 'help' output of its parent.
+	GroupID string
+
 	// Long is the long message shown in the 'help <this-command>' output.
 	Long string
 
@@ -128,6 +137,9 @@ type Command struct {
 	// PersistentPostRunE: PersistentPostRun but returns an error.
 	PersistentPostRunE func(cmd *Command, args []string) error
 
+	// groups for subcommands
+	commandgroups []*Group
+
 	// args is actual args parsed from flags.
 	args []string
 	// flagErrorBuf contains all error messages from pflag.
@@ -160,6 +172,12 @@ type Command struct {
 	// helpCommand is command with usage 'help'. If it's not defined by user,
 	// cobra uses default help command.
 	helpCommand *Command
+	// helpCommandGroupID is the group id for the helpCommand
+	helpCommandGroupID string
+
+	// completionCommandGroupID is the group id for the completion command
+	completionCommandGroupID string
+
 	// versionTemplate is the version template defined by user.
 	versionTemplate string
 
@@ -303,6 +321,21 @@ func (c *Command) SetHelpCommand(cmd *Command) {
 	c.helpCommand = cmd
 }
 
+// SetHelpCommandGroup sets the group id of the help command.
+func (c *Command) SetHelpCommandGroupID(groupID string) {
+	if c.helpCommand != nil {
+		c.helpCommand.GroupID = groupID
+	}
+	// helpCommandGroupID is used if no helpCommand is defined by the user
+	c.helpCommandGroupID = groupID
+}
+
+// SetCompletionCommandGroup sets the group id of the completion command.
+func (c *Command) SetCompletionCommandGroupID(groupID string) {
+	// completionCommandGroupID is used if no completion commmand is defined by the user
+	c.Root().completionCommandGroupID = groupID
+}
+
 // SetHelpTemplate sets help template to be used. Application can use it to set custom template.
 func (c *Command) SetHelpTemplate(s string) {
 	c.helpTemplate = s
@@ -511,10 +544,13 @@ Aliases:
   {{.NameAndAliases}}{{end}}{{if .HasExample}}
 
 Examples:
-{{.Example}}{{end}}{{if .HasAvailableSubCommands}}
+{{.Example}}{{end}}{{if .HasAvailableSubCommands}}{{$cmds := .Commands}}
 
-Available Commands:{{range .Commands}}{{if (or .IsAvailableCommand (eq .Name "help"))}}
-  {{rpad .Name .NamePadding }} {{.Short}}{{end}}{{end}}{{end}}{{if .HasAvailableLocalFlags}}
+Available Commands:{{range $cmds}}{{if (and (eq .GroupID "") (or .IsAvailableCommand (eq .Name "help")))}}
+  {{rpad .Name .NamePadding }} {{.Short}}{{end}}{{end}}{{range $group := .Groups}}
+
+{{.Title}}{{range $cmds}}{{if (and (eq .GroupID $group.ID) (or .IsAvailableCommand (eq .Name "help")))}}
+  {{rpad .Name .NamePadding }} {{.Short}}{{end}}{{end}}{{end}}{{end}}{{if .HasAvailableLocalFlags}}
 
 Flags:
 {{.LocalFlags.FlagUsages | trimTrailingWhitespaces}}{{end}}{{if .HasAvailableInheritedFlags}}
@@ -1140,6 +1176,7 @@ Simply type ` + c.Name() + ` help [path to command] for full details.`,
 					CheckErr(cmd.Help())
 				}
 			},
+			GroupID: c.helpCommandGroupID,
 		}
 	}
 	c.RemoveCommand(c.helpCommand)
@@ -1178,6 +1215,10 @@ func (c *Command) AddCommand(cmds ...*Command) {
 			panic("Command can't be a child of itself")
 		}
 		cmds[i].parent = c
+		// if Group is not defined let the developer know right away
+		if x.GroupID != "" && !c.ContainsGroup(x.GroupID) {
+			panic(fmt.Sprintf("Group id %s is not defined", x.GroupID))
+		}
 		// update max lengths
 		usageLen := len(x.Use)
 		if usageLen > c.commandsMaxUseLen {
@@ -1200,6 +1241,26 @@ func (c *Command) AddCommand(cmds ...*Command) {
 	}
 }
 
+// Groups returns a slice of child command groups.
+func (c *Command) Groups() []*Group {
+	return c.commandgroups
+}
+
+// ContainGroups return if groupID exists in the list of command groups.
+func (c *Command) ContainsGroup(groupID string) bool {
+	for _, x := range c.commandgroups {
+		if x.ID == groupID {
+			return true
+		}
+	}
+	return false
+}
+
+// AddGroup adds one or more command groups to this parent command.
+func (c *Command) AddGroup(groups ...*Group) {
+	c.commandgroups = append(c.commandgroups, groups...)
+}
+
 // RemoveCommand removes one or more commands from a parent command.
 func (c *Command) RemoveCommand(cmds ...*Command) {
 	commands := []*Command{}

completions.go

@@ -673,6 +673,7 @@ See each sub-command's help for details on how to use the generated script.
 		Args:              NoArgs,
 		ValidArgsFunction: NoFileCompletions,
 		Hidden:            c.CompletionOptions.HiddenDefaultCmd,
+		GroupID:           c.completionCommandGroupID,
 	}
 	c.AddCommand(completionCmd)
 

user_guide.md

@@ -490,6 +490,13 @@ command and flag definitions are needed.
 Help is just a command like any other. There is no special logic or behavior
 around it. In fact, you can provide your own if you want.
 
+### Grouping commands in help
+
+Cobra supports grouping of available commands. Groups must be explicitly defined by `AddGroup` and set by
+the `GroupId` element of a subcommand. The groups will appear in the same order as they are defined.
+If you use the generated `help` or `completion` commands, you can set the group ids by `SetHelpCommandGroupId`
+and `SetCompletionCommandGroupId`, respectively.
+
 ### Defining your own help
 
 You can provide your own Help command or your own template for the default command to use