scaffold_begin.swift

import ArgumentParser
import Foundation

struct Scaffold: ParsableCommand {
     @Argument()
     var template: String
     func run() throws {
     
     }    

     static func preprocess(_ arguments: [String]) throws {
          // Obtaining template name
          let templateName = arguments[1]
          // Based on template name find its manifest
          let manifestPath = FileManager.default.currentDirectoryPath + "/\(templateName)/manifest.json"
          // Obtain data
          let data = try Data(contentsOf: URL(fileURLWithPath: manifestPath))
          // Parse the attributes
          let attributes: [String] = try JSONDecoder().decode([String].self, from: data)
          print(attributes)
     }
}