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updated readme with custom event listeners. #791

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merged 1 commit into from May 3, 2018
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updated readme with custom event listeners. #791

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Expand Up @@ -356,6 +356,22 @@ function make_red(txt) {
Output help information and exit immediately.
Optional callback cb allows post-processing of help text before it is displayed.


## Custom event listeners
You can execute custom actions by listening to command and option events.

```js
program.on('option:verbose', function () {
process.env.VERBOSE = this.verbose;
});

// error on unknown commands
program.on('command:*', function () {
console.error('Invalid command: %s\nSee --help for a list of available commands.', program.args.join(' '));
process.exit(1);
});
```

## Examples

```js
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