refresh currencies every day

Sources/alfred-soulvercore/main.swift

@@ -7,7 +7,12 @@
 
 import SoulverCore
 
-print(calc() ?? "")
+refreshIfNeeded {
+  print(calc() ?? "")
+  exit(0)
+}
+
+RunLoop.current.run()
 
 func calc() -> String? {
   let input = CommandLine.arguments.dropFirst().joined(separator: " ")

Sources/alfred-soulvercore/prefs.swift

@@ -0,0 +1,13 @@
+import Foundation
+
+let BundleIdentifier = "design.precioso.alfred-soulvercore"
+
+let userDefaults = UserDefaults(suiteName: BundleIdentifier)!
+
+let cacheFolder = try? FileManager.default.url(
+  for: .cachesDirectory, in: .userDomainMask, appropriateFor: nil, create: true
+).appendingPathComponent(BundleIdentifier)
+
+let LastRefreshKey = "last-refresh"
+let UpdatePeriod: TimeInterval = 60 * 60 * 24  // 1 day in seconds
+let CurrencyDataURL = cacheFolder?.appendingPathComponent("currencies.json")

Sources/alfred-soulvercore/refresh.swift

@@ -0,0 +1,44 @@
+import Foundation
+import SoulverCore
+
+func refreshIfNeeded(completionHandler: @escaping (() -> Void)) {
+  let lastRefresh = loadData()
+  let nextRefresh = lastRefresh.addingTimeInterval(UpdatePeriod)
+  let currentDate = Date()
+
+  if nextRefresh < currentDate {
+    refresh { result in
+      if result {
+        saveData()
+      }
+      completionHandler()
+    }
+  } else {
+    completionHandler()
+  }
+}
+
+func refresh(completionHandler: @escaping ((Bool) -> Void)) {
+  CurrencyList.shared.defaultCurrencySet = .popular
+  CurrencyList.shared.refreshRates(completionHandler: completionHandler)
+}
+
+func loadData() -> Date {
+  var returnDate: Date? = nil
+
+  if let url = CurrencyDataURL,
+    (try? CurrencyList.shared.loadCurrenciesFrom(url: url)) != nil
+  {
+    returnDate = userDefaults.object(forKey: LastRefreshKey) as? Date
+  }
+
+  return returnDate ?? Date.distantPast
+}
+
+func saveData() {
+  if let url = CurrencyDataURL,
+     (try? FileManager.default.createDirectory(at: url.deletingLastPathComponent(), withIntermediateDirectories: true)) != nil {
+    CurrencyList.shared.saveCurrenciesTo(url: url)
+    userDefaults.set(Date(), forKey: LastRefreshKey)
+  }
+}