[foal generate controller] Support sub-directories and extend the --register option

[LoicPoullain]

Issue

Large applications can have dozens of controllers. Placing them all at the root of the controllers/ directory is not possible in this case and we need to create subdirectories.

Unfortunately the current version of generate controller only generates controllers at the root of controllers/. In addition, the --register option only allows the controllers to be registered in app.controller.ts.

Possible solution

Let the command accept sub-directories (and create them if they do not exist already) and make the --register flag accept an optional parameter specifying the parent where to register the controller.

Example

File Structure (before)

controllers/
|- api/
|  |- user.controller.ts
|- api.controller.ts
'- auth.controller.ts
app.controller.ts

api.controller.ts (before)

...
export class ApiController {
  subDirectories = [
    controller('/users', UserController),
  ];
}

Command

foal generate controller api/products/cars --register api

File Structure (after)

controllers/
|- api/
|  |- products/
|  |  '- cars.controller.ts
|  |- user.controller.ts
|- api.controller.ts
'- auth.controller.ts
app.controller.ts

api.controller.ts (after)

...
export class ApiController {
  subDirectories = [
    controller('/users', UserController),
    controller('/products/cars', CarsController),
  ];
}

[LoicPoullain]

Fixed in v1.9