daton/cli/src/directive/UsageDirective.ts

import {Directive} from './Directive.ts'
import {CLIService} from "../service/CLI.service.ts";
import {Injectable} from "../../../di/src/decorator/Injection.ts";

@Injectable()
export class UsageDirective extends Directive {
    public readonly keyword = 'help'
    public readonly help = 'Display usage information'

    constructor(
        protected readonly cli: CLIService,
    ) { super() }

    public async invoke() {
        console.log('')
        if ( this.cli.show_logo() ) {
            console.log(this.cli.get_logo())
            console.log('')
        }

        console.log('Welcome to the Daton CLI. This tool can help you interact with your Daton application.\n')
        console.log('To get started, specify one of the directives below. You can always specify the --help option to get more information about a directive.')
        console.log('')

        const usages = this.cli.get_directives().map((directive: Directive): string[] => {
            return [directive.keyword, directive.help]
        })

        const pad_length = usages.max(grp => grp[0].length) + 2

        const padded_usages = usages.map(grp => {
            const keyword = grp[0]
            if ( keyword.length < pad_length ) {
                const pad = Array(pad_length - keyword.length).fill(' ').join('')
                return [`${pad}${keyword}`, grp[1]]
            }

            return grp
        })

        padded_usages.each(grp => {
            console.log(`${grp[0]} : ${grp[1]}`)
        })

        console.log('')
    }
}