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Zhongwei Li
513
skills/commander-patterns/examples/advanced-option-class.md
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513
skills/commander-patterns/examples/advanced-option-class.md
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# Advanced Option Class Usage
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Comprehensive examples of the Option class for advanced option handling.
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## Basic Option Class
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```typescript
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import { Command, Option } from 'commander';
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const program = new Command();
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program
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.command('deploy')
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.addOption(
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new Option('-e, --env <environment>', 'target environment')
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.choices(['dev', 'staging', 'prod'])
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.default('dev')
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)
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.action((options) => {
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console.log('Environment:', options.env);
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});
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program.parse();
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```
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## Option with Choices
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```typescript
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import { Command, Option } from 'commander';
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program
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.command('log')
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.addOption(
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new Option('-l, --level <level>', 'log level')
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.choices(['debug', 'info', 'warn', 'error'])
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.default('info')
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)
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.addOption(
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new Option('-f, --format <format>', 'output format')
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.choices(['json', 'yaml', 'table'])
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.default('table')
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)
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.action((options) => {
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console.log(`Logging at ${options.level} level in ${options.format} format`);
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});
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```
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Usage:
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```bash
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mycli log --level debug --format json
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mycli log --level invalid # Error: invalid choice
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```
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## Mandatory Options
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```typescript
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import { Command, Option } from 'commander';
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program
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.command('deploy')
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.addOption(
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new Option('-t, --token <token>', 'API token')
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.makeOptionMandatory()
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)
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.addOption(
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new Option('-e, --env <environment>', 'environment')
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.choices(['dev', 'staging', 'prod'])
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.makeOptionMandatory()
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)
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.action((options) => {
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console.log('Deploying with token:', options.token);
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console.log('Environment:', options.env);
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});
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```
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Usage:
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```bash
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mycli deploy # Error: required option missing
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mycli deploy --token abc --env prod # ✓ Works
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```
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## Options from Environment Variables
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```typescript
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import { Command, Option } from 'commander';
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program
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.command('deploy')
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.addOption(
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new Option('-t, --token <token>', 'API token')
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.env('API_TOKEN')
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.makeOptionMandatory()
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)
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.addOption(
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new Option('-u, --api-url <url>', 'API URL')
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.env('API_URL')
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.default('https://api.example.com')
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)
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.action((options) => {
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console.log('Token:', options.token);
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console.log('API URL:', options.apiUrl);
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});
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```
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Usage:
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```bash
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export API_TOKEN=abc123
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export API_URL=https://custom-api.com
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mycli deploy # Uses environment variables
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mycli deploy --token xyz # CLI arg overrides env var
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```
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## Custom Argument Parsers
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```typescript
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import { Command, Option } from 'commander';
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program
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.command('scale')
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.addOption(
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new Option('-r, --replicas <count>', 'number of replicas')
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.argParser((value) => {
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const count = parseInt(value, 10);
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if (isNaN(count) || count < 1 || count > 100) {
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throw new Error('Replicas must be between 1 and 100');
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}
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return count;
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})
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.default(3)
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)
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.addOption(
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new Option('-m, --memory <size>', 'memory limit')
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.argParser((value) => {
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// Parse sizes like "512M", "2G"
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const match = value.match(/^(\d+)([MG])$/i);
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if (!match) {
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throw new Error('Invalid memory format (use 512M or 2G)');
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}
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const [, num, unit] = match;
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const mb = parseInt(num) * (unit.toUpperCase() === 'G' ? 1024 : 1);
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return mb;
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})
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.default(512)
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)
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.action((options) => {
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console.log('Replicas:', options.replicas);
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console.log('Memory:', options.memory, 'MB');
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});
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```
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Usage:
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```bash
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mycli scale --replicas 5 --memory 2G
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# Replicas: 5
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# Memory: 2048 MB
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```
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## Conflicting Options
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```typescript
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import { Command, Option } from 'commander';
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program
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.command('build')
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.addOption(
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new Option('--cache', 'enable caching')
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.conflicts('noCache')
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)
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.addOption(
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new Option('--no-cache', 'disable caching')
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.conflicts('cache')
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)
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.addOption(
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new Option('--watch', 'watch mode')
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.conflicts('production')
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)
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.addOption(
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new Option('--production', 'production build')
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.conflicts('watch')
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)
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.action((options) => {
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console.log('Cache:', options.cache);
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console.log('Watch:', options.watch);
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console.log('Production:', options.production);
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});
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```
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Usage:
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```bash
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mycli build --cache # ✓ Works
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mycli build --no-cache # ✓ Works
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mycli build --cache --no-cache # ✗ Error: conflicting options
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mycli build --watch --production # ✗ Error: conflicting options
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```
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## Option Implies
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```typescript
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import { Command, Option } from 'commander';
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program
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.command('server')
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.addOption(
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new Option('--ssl', 'enable SSL')
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.implies({ sslCert: './cert.pem', sslKey: './key.pem' })
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)
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.addOption(
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new Option('--ssl-cert <path>', 'SSL certificate path')
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)
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.addOption(
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new Option('--ssl-key <path>', 'SSL key path')
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)
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.addOption(
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new Option('--secure', 'secure mode')
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.implies({ ssl: true, httpsOnly: true })
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)
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.addOption(
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new Option('--https-only', 'enforce HTTPS')
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)
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.action((options) => {
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console.log('SSL:', options.ssl);
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console.log('SSL Cert:', options.sslCert);
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console.log('SSL Key:', options.sslKey);
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console.log('HTTPS Only:', options.httpsOnly);
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});
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```
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Usage:
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```bash
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mycli server --ssl
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# SSL: true
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# SSL Cert: ./cert.pem
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# SSL Key: ./key.pem
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mycli server --secure
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# SSL: true
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# HTTPS Only: true
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```
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## Preset Configurations
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```typescript
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import { Command, Option } from 'commander';
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program
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.command('deploy')
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.addOption(
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new Option('--preset <preset>', 'use preset configuration')
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.choices(['minimal', 'standard', 'enterprise'])
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.argParser((value) => {
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const presets = {
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minimal: {
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replicas: 1,
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memory: '256M',
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cpu: '0.25',
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autoScaling: false,
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},
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standard: {
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replicas: 3,
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memory: '512M',
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cpu: '0.5',
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autoScaling: true,
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},
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enterprise: {
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replicas: 10,
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memory: '2G',
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cpu: '2',
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autoScaling: true,
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loadBalancer: true,
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monitoring: true,
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},
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};
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return presets[value as keyof typeof presets];
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})
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)
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.action((options) => {
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if (options.preset) {
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console.log('Using preset configuration:');
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console.log(JSON.stringify(options.preset, null, 2));
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}
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});
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```
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Usage:
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```bash
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mycli deploy --preset enterprise
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# Using preset configuration:
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# {
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# "replicas": 10,
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# "memory": "2G",
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# "cpu": "2",
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# "autoScaling": true,
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# "loadBalancer": true,
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# "monitoring": true
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# }
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```
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## Hidden Options (Debug/Internal)
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```typescript
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import { Command, Option } from 'commander';
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program
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.command('build')
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.option('-p, --production', 'production build')
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.addOption(
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new Option('--debug', 'enable debug mode')
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.hideHelp()
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)
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.addOption(
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new Option('--internal-api', 'use internal API')
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.hideHelp()
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.default(false)
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)
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.action((options) => {
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if (options.debug) {
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console.log('Debug mode enabled');
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console.log('All options:', options);
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}
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});
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```
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## Complex Validation
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```typescript
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import { Command, Option } from 'commander';
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program
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.command('backup')
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.addOption(
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new Option('-s, --schedule <cron>', 'backup schedule (cron format)')
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.argParser((value) => {
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// Validate cron expression
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const cronRegex = /^(\*|([0-9]|1[0-9]|2[0-9]|3[0-9]|4[0-9]|5[0-9])|\*\/([0-9]|1[0-9]|2[0-9]|3[0-9]|4[0-9]|5[0-9])) (\*|([0-9]|1[0-9]|2[0-3])|\*\/([0-9]|1[0-9]|2[0-3])) (\*|([1-9]|1[0-9]|2[0-9]|3[0-1])|\*\/([1-9]|1[0-9]|2[0-9]|3[0-1])) (\*|([1-9]|1[0-2])|\*\/([1-9]|1[0-2])) (\*|([0-6])|\*\/([0-6]))$/;
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if (!cronRegex.test(value)) {
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throw new Error('Invalid cron expression');
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}
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return value;
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})
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)
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.addOption(
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new Option('-r, --retention <days>', 'backup retention in days')
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.argParser((value) => {
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const days = parseInt(value, 10);
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if (isNaN(days) || days < 1 || days > 365) {
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throw new Error('Retention must be between 1 and 365 days');
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}
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return days;
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})
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.default(30)
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)
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.action((options) => {
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console.log('Schedule:', options.schedule);
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console.log('Retention:', options.retention, 'days');
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});
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```
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Usage:
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```bash
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mycli backup --schedule "0 2 * * *" --retention 90
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# Schedule: 0 2 * * *
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# Retention: 90 days
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```
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## Cumulative Options
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```typescript
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import { Command, Option } from 'commander';
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program
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.command('log')
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.addOption(
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new Option('-v, --verbose', 'increase verbosity')
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.argParser((value, previous) => {
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return previous + 1;
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})
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.default(0)
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)
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.action((options) => {
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console.log('Verbosity level:', options.verbose);
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// 0 = normal
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// 1 = verbose (-v)
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// 2 = very verbose (-vv)
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// 3 = debug (-vvv)
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});
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```
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Usage:
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```bash
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mycli log # verbosity: 0
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mycli log -v # verbosity: 1
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mycli log -vv # verbosity: 2
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mycli log -vvv # verbosity: 3
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```
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## Complete Example
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```typescript
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#!/usr/bin/env node
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import { Command, Option } from 'commander';
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import chalk from 'chalk';
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const program = new Command();
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program
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.name('deploy-cli')
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.version('1.0.0');
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program
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.command('deploy')
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.description('Deploy application with advanced options')
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// Required with choices
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.addOption(
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new Option('-e, --env <environment>', 'deployment environment')
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.choices(['dev', 'staging', 'prod'])
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.makeOptionMandatory()
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)
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// Environment variable with validation
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.addOption(
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new Option('-t, --token <token>', 'API token')
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.env('DEPLOY_TOKEN')
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.makeOptionMandatory()
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.argParser((value) => {
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if (value.length < 32) {
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throw new Error('Token must be at least 32 characters');
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}
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return value;
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})
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)
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// Custom parser with unit conversion
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.addOption(
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new Option('-m, --memory <size>', 'memory allocation')
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.argParser((value) => {
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const match = value.match(/^(\d+)([MG])$/i);
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if (!match) {
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throw new Error('Memory must be in format: 512M or 2G');
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}
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const [, num, unit] = match;
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return parseInt(num) * (unit.toUpperCase() === 'G' ? 1024 : 1);
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})
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.default(512)
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)
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// Conflicting options
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.addOption(
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new Option('--fast', 'fast deployment (skip tests)')
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.conflicts('safe')
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)
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.addOption(
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new Option('--safe', 'safe deployment (full tests)')
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.conflicts('fast')
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.default(true)
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)
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// Implies relationship
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.addOption(
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new Option('--production-mode', 'enable production optimizations')
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.implies({ env: 'prod', safe: true, monitoring: true })
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)
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.addOption(
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new Option('--monitoring', 'enable monitoring')
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)
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// Hidden debug option
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.addOption(
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new Option('--debug', 'debug mode')
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.hideHelp()
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)
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.action((options) => {
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console.log(chalk.blue('Deployment Configuration:'));
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console.log('Environment:', chalk.yellow(options.env));
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console.log('Token:', options.token ? chalk.green('***set***') : chalk.red('missing'));
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console.log('Memory:', `${options.memory}MB`);
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console.log('Mode:', options.fast ? 'fast' : 'safe');
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console.log('Production Mode:', options.productionMode || false);
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console.log('Monitoring:', options.monitoring || false);
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if (options.debug) {
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console.log(chalk.gray('\nDebug - All options:'));
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console.log(chalk.gray(JSON.stringify(options, null, 2)));
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}
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console.log(chalk.green('\n✓ Deployment started'));
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});
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program.parse();
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```
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Usage:
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```bash
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export DEPLOY_TOKEN=abc123xyz789abc123xyz789abc12345
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|
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# Basic deployment
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deploy-cli deploy --env staging
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# Custom memory
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||||
deploy-cli deploy --env prod --memory 4G
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# Fast mode
|
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deploy-cli deploy --env dev --fast
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# Production mode (implies multiple settings)
|
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deploy-cli deploy --production-mode
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# Debug
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deploy-cli deploy --env dev --debug
|
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```
|
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Block a user