Show help for no command and handle unknown command

[wclr]

I trouble to implement folliwng case:

1. Show message unknown command if some unknnown command supplied
2. Show help if no command supplied.

To handle unknown command I use default command *, it works ok

  .command({
    command: '*',
    handler: (argv) => {      
      if (argv._[0]) {
        console.log('Unknown commmand', argv._[0])        
      }
    }
  })
 .demand(1)

But demand(1) here doesn't work in this case so If I supply no command nothing happens at all (it goes to * handler)

I tried to use yargs.showHelp() somewhere in '*' handler or just checking main argv

const argv = yargs...

if (!argv._[0]) {
  yargs.showHelp()
}

but it doesn't show help. All it shows:

Options:
  --help  Show help                                                    [boolean]

[the-spyke]

Same issue here. I don't what to use strict mode as I need to parse unspecified options. My temporary solution is to use a flag in handlers.

[fgarcia]

for those waiting for this feature, here is how I do it

var yargs = require('yargs')

var argv = yargs
  .command('all', 'All projects', ya => {
    console.log('all')
  })
  .command('watch', 'watch')
  .command('short', 'short, just print spec file and console', () => {})
  .command('full', 'long, naming each test', () => {})

  .strict().argv

if (!argv._[0]) {
  yargs.showHelp()
}

[gempain]

Another, shorter way:

yargs
  .demandCommand(1)
  .strict()

This will throw an error if you don't pass a command, and will print the help at the same time.

[Zelgadis87]

@gempain @fgarcia That unfortunately also throws on valid commands with unrecognized arguments, which is not exactly the same.
Unfortunately I have dynamic arguments. I would only need to check if the command is recognized with arbitrary arguments.

[gempain]

@Zelgadis87 then I guess you have to use * and remove the .strict()

[OsmanAltun]

Specifying default command still removes all commands from yargs.showHelp(callback).

+1

[bcoe]

Cleaning up some stale issues, apologize this one was open for so long.

@wclr @Zelgadis87 @gempain there is now the method available .strictCommands(), which I believe provides exactly the behavior you want -- failing on unknown commands, including the default, but allowing any flags.

@OsmanAltun is working on a fix for .showHelp() listing commands in #1826, but I think `.strictCommands()`` is closer to what you're looking for.