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89 lines
2.8 KiB
Markdown
89 lines
2.8 KiB
Markdown
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# CLI Commands
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## Writing new commands
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Commands are classes which extend the base `Command` class (see [`command.js`](command.js)).
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The only required override is the `handle()` method, which defines the logic for the command:
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```javascript
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const Command = require('./command');
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module.exports = class REPL extends Command {
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async handle(argv = {}) {
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// this is where your logic is implemented
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}
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};
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```
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### Arguments
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Optionally, you can override the `setup()` method, where you can define any command-line arguments and help text etc:
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```javascript
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setup() {
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this.help('A brief explanation of what your command does, shown when the --help flag is used');
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// arguments are passed to sywac - see https://sywac.io/docs/
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this.argument('--color', {type: 'string', defaultValue: 'yellow'});
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}
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```
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Arguments specified in `setup()` are accessed from the `argv` object passed to the `handle()` method:
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```javascript
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async handle(argv = {}) {
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this.log(`Your color is ${argv.color}`);
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}
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```
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### Output
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You can write console output using a number of helper methods:
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```javascript
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this.log('Writes a line to the console');
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```
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Available helpers are `log`, `ok`, `info`, `error`, `fatal`, `warn`, and `debug`.
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### Interactive input
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**Confirm an action** with:
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```javascript
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const confirm = await this.confirm('Are you sure you want to continue?');
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if (!confirm) {
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// ...
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}
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```
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**Ask for user input** with:
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```javascript
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const fruit = await this.ask('Favorite fruit?');
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this.info(`You answered: ${fruit}`);
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```
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**Get masked input** with:
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```javascript
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const password = await this.secret('Password:');
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this.log(`Your password is: ${password}`);
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```
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### Progress bars
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You can show a progress bar to e.g. display progress through a long-running task.
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`this.progressBar()` returns an instance of a [cli-progress](https://github.com/npkgz/cli-progress) progress bar. You can add a status to the output by calling `.update({status: 'Your status message'})`, and the progress bar can be advanced by `.increment()`:
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```javascript
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const progressBar = this.progressBar(listOfTasks.length);
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for (const task in listOfTasks) {
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progressBar.update({status: `Running ${task.name}`});
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await task.run();
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progressBar.increment();
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}
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```
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## Registering commands
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New commands need to be registered in `ghost.js` before they can be called.
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Commands are called by passing them to `command.run()` either as a class definition, or as the name of the file to be required in the `core/cli` directory.
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`command.run()` is a static method on the Command class that handles instantiating the command, resolving arguments, and calling the `handle` method. You can instantiate and call a command outside of this structure, but you'll need to resolve/provide the arguments (`argv` object) manually.
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