Proposal: Make command suggestion messages configurable

[MarvinJWendt]

Hi, we have a project where clear definitions were made, what the output of the CLI has to look like. We appreciate the automatic suggestions if a command was misspelled. Sadly it seems like we cannot customize the suggestion message and the default message doesn't really fit with the rest of the CLI.

Is there a possibility to make a SetSuggestFunc() like it's been done with SetHelpFunc()?

This could be used to change the suggestion message:

rootCmd.SetSuggestFunc(func(suggestedCommands []*cobra.Command) {
    var commandNames string
    for _, command := range suggestedCommands {
        	commandNames += command.Use + " "
    }
    fmt.Printf("Did you mean any of [%s]", commandNames)
})

[github-actions]

This issue is being marked as stale due to a long period of inactivity

[MarvinJWendt]

Not stale

[johnSchnake]

Seems narrowly focused, clear, and consistent with other features we've implemented. 👍

[zanvd]

Hi, I started working on this one and wonder if it's fine to make the suggestion function extendable just on the command.go level and leave the wrappers as are.
The wrappers are:

• https://github.com/spf13/cobra/blob/main/args.go#L36
• https://github.com/spf13/cobra/blob/main/args.go#L61

With leaving wrappers intact, the message would be something along the lines of:

Error: unknown command "something" for "root"\nArg: "something"\nRun 'root --help' for usage.\n

Custom suggestion function used for the above message:

rootCmd.SetSuggestFunc(func(a string) string {
	return fmt.Sprintf("\nArg: %q", a)
})