Import other modules into monorepo

src/cli/directive/UsageDirective.ts

@@ -0,0 +1,54 @@
+import {Directive} from "../Directive"
+import {Injectable, Inject} from "../../di"
+import {padRight} from "../../util"
+import {CommandLine} from "../service"
+
+/**
+ * Directive that prints the help message and usage information about
+ * directives registered with the command line utility.
+ */
+@Injectable()
+export class UsageDirective extends Directive {
+    @Inject()
+    protected readonly cli!: CommandLine
+
+    public getKeywords(): string | string[] {
+        return 'help'
+    }
+
+    public getDescription(): string {
+        return 'print information about available commands'
+    }
+
+    public handle(argv: string[]): void | Promise<void> {
+        const directiveStrings = this.cli.getDirectives()
+            .map(cls => this.make<Directive>(cls))
+            .map<[string, string]>(dir => {
+                return [dir.getMainKeyword(), dir.getDescription()]
+            })
+
+        const maxLen = directiveStrings.max<number>(x => x[0].length)
+
+        const printStrings = directiveStrings.map(grp => {
+                return [padRight(grp[0], maxLen + 1), grp[1]]
+            })
+            .map(grp => {
+                return `    ${grp[0]}: ${grp[1]}`
+            })
+            .toArray()
+
+        console.log(this.cli.getASCIILogo())
+        console.log([
+            '',
+            'Welcome to Extollo! Specify a command to get started.',
+            '',
+            `USAGE: ex <directive> [..options]`,
+            '',
+            ...printStrings,
+            '',
+            'For usage information about a particular command, pass the --help flag.',
+            '-------------------------------------------',
+            `powered by Extollo, © ${(new Date).getFullYear()} Garrett Mills`,
+        ].join('\n'))
+    }
+}