CommandNotFound:

[stevewi-niteflyte]

I found this snippet in command_test.go in the source:

func TestCommand_CommandNotFound(t *testing.T) {
	counts := &opCounts{}
	cmd := &Command{
		CommandNotFound: func(context.Context, *Command, string) {
			counts.Total++
			counts.CommandNotFound = counts.Total
		},
		Commands: []*Command{
			{
				Name: "bar",
				Action: func(context.Context, *Command) error {
					counts.Total++
					counts.SubCommand = counts.Total
					return nil
				},
			},
		},
	}
 ...

So, I decided to implement it in my own command:

cmd := &cli.Command {

        Name:          constants.ME,
        ...
        CommandNotFound: func (ctx context.Context, cmd *cli.Command, str string) {
            fmt.Println("No such command", str)
            os.Exit(1)
        },
       ...
}

I can't get the CommandNotFound: lambda to fire:

$ a2m foo
$

I expected to see the No such command foo message but I got nada. What am I doing wrong?

Follow-on question...a few of my commands have subcommands. How do I implement the same for a series of subcommands? Thanks in advance...

[g4lb]

Your root command likely has an Action. Then foo goes to it as an argument, so CommandNotFound never runs. My tests (v3.14.0):

• with Action, a2m foo - Action gets [foo]
• without Action, a2m foo - "No such command foo"

For subcommands, set CommandNotFound on each parent. It does not inherit.

[stevewi-niteflyte]

Thank you! My Action: was a simple check on the length of os.Args that could easily be moved ahead of the commands definition so doing that (and eliminating the Action:) fixed it. I've implemented a different CommandNotFound: on all my subcommands too. Thanks for your help!