Move the request credential function into one file

pass/Helpers/GitCredentialPassword.swift

@@ -0,0 +1,47 @@
+//
+//  GitCredentialPassword.swift
+//  pass
+//
+//  Created by Sun, Mingshen on 11/30/19.
+//  Copyright © 2019 Bob Sun. All rights reserved.
+//
+
+import Foundation
+import SVProgressHUD
+import passKit
+
+public func requestGitCredentialPassword(credential: GitCredential.Credential,
+                                      lastPassword: String?,
+                                      controller: UIViewController) -> String? {
+    let sem = DispatchSemaphore(value: 0)
+    var password: String?
+    let message: String = {
+        switch credential {
+        case .http:
+            return "FillInGitAccountPassword.".localize()
+        case .ssh:
+            return "FillInSshKeyPassphrase.".localize()
+        }
+    }()
+
+    DispatchQueue.main.async {
+        SVProgressHUD.dismiss()
+        let alert = UIAlertController(title: "Password".localize(), message: message, preferredStyle: .alert)
+        alert.addTextField() {
+            $0.text = lastPassword ?? ""
+            $0.isSecureTextEntry = true
+        }
+        alert.addAction(UIAlertAction(title: "Ok".localize(), style: .default) { _ in
+            password = alert.textFields?.first?.text
+            sem.signal()
+        })
+        alert.addAction(UIAlertAction(title: "Cancel".localize(), style: .cancel) { _ in
+            password = nil
+            sem.signal()
+        })
+        controller.present(alert, animated: true)
+    }
+
+    let _ = sem.wait(timeout: .distantFuture)
+    return password
+}