category.go
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category.go
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	package cli

	// CommandCategories is a slice of *CommandCategory.
	type CommandCategories []*CommandCategory

	// CommandCategory is a category containing commands.
	type CommandCategory struct {
	Name string
	Commands Commands
	}

	func (c CommandCategories) Less(i, j int) bool {
	return c[i].Name < c[j].Name
	}

	func (c CommandCategories) Len() int {
	return len(c)
	}

	func (c CommandCategories) Swap(i, j int) {
	c[i], c[j] = c[j], c[i]
	}

	// AddCommand adds a command to a category.
	func (c CommandCategories) AddCommand(category string, command Command) CommandCategories {
	for _, commandCategory := range c {
	if commandCategory.Name == category {
	commandCategory.Commands = append(commandCategory.Commands, command)
	return c
	}
	}
	return append(c, &CommandCategory{Name: category, Commands: []Command{command}})
	}

	// VisibleCommands returns a slice of the Commands with Hidden=false
	func (c *CommandCategory) VisibleCommands() []Command {
	ret := []Command{}
	for _, command := range c.Commands {
	if !command.Hidden {
	ret = append(ret, command)
	}
	}
	return ret
	}