Create BetaTesterProcessor for rendering CSV

Author: DechengMa

Package.resolved

@@ -24,7 +24,7 @@ let package = Package(
             from: "0.0.2"
         ),
         .package(
-            url: "https://github.com/AvdLee/appstoreconnect-swift-sdk.git",
+            url: "https://github.com/ittybittyapps/appstoreconnect-swift-sdk.git",
             .branch("master")
         ),
         .package(

Package.swift

@@ -0,0 +1,45 @@
+// Copyright 2020 Itty Bitty Apps Pty Ltd
+
+import CodableCSV
+import Files
+import Foundation
+import Model
+
+struct BetaTesterProcessor {
+
+    let folder: Folder
+
+    typealias FilePath = String
+
+    func write(group: BetaGroup, testers: [BetaTester]) throws -> FilePath {
+        let file = try folder.createFile(named: "\(group.app.bundleId ?? "")_\(group.groupName)_beta-testers.csv")
+
+        try file.write(testers.renderAsCSV())
+
+        return file.name
+    }
+}
+
+// TODO: merge this with ResultRenderable in main module
+protocol CSVRenderable: Codable {
+    var headers: [String] { get }
+    var rows: [[String]] { get }
+}
+
+extension CSVRenderable {
+    func renderAsCSV() -> String {
+        let wholeTable = [headers] + rows
+
+        return try! CSVWriter.encode(rows: wholeTable, into: String.self) // swiftlint:disable:this force_try
+    }
+}
+
+extension Array: CSVRenderable where Element == BetaTester {
+    var headers: [String] {
+        ["Email", "First Name", "Last Name", "Invite Type"]
+    }
+
+    var rows: [[String]] {
+        self.map { [$0.email, $0.firstName, $0.lastName, $0.inviteType].compactMap { $0 } }
+    }
+}