now prompts to replace existing file

Author: scriptingosx

FetchInstallerPkg.xcodeproj/xcshareddata/xcschemes/FetchInstallerPkg.xcscheme

@@ -0,0 +1,79 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<Scheme
+   LastUpgradeVersion = "1300"
+   version = "1.3">
+   <BuildAction
+      parallelizeBuildables = "YES"
+      buildImplicitDependencies = "YES">
+      <BuildActionEntries>
+         <BuildActionEntry
+            buildForTesting = "YES"
+            buildForRunning = "YES"
+            buildForProfiling = "YES"
+            buildForArchiving = "YES"
+            buildForAnalyzing = "YES">
+            <BuildableReference
+               BuildableIdentifier = "primary"
+               BlueprintIdentifier = "C636435D2670E1B800301DC8"
+               BuildableName = "Download Full Installer.app"
+               BlueprintName = "Download Full Installer"
+               ReferencedContainer = "container:FetchInstallerPkg.xcodeproj">
+            </BuildableReference>
+         </BuildActionEntry>
+      </BuildActionEntries>
+   </BuildAction>
+   <TestAction
+      buildConfiguration = "Debug"
+      selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
+      selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
+      shouldUseLaunchSchemeArgsEnv = "YES">
+      <Testables>
+      </Testables>
+   </TestAction>
+   <LaunchAction
+      buildConfiguration = "Debug"
+      selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
+      selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
+      launchStyle = "0"
+      useCustomWorkingDirectory = "NO"
+      ignoresPersistentStateOnLaunch = "NO"
+      debugDocumentVersioning = "YES"
+      debugServiceExtension = "internal"
+      enableGPUValidationMode = "1"
+      allowLocationSimulation = "YES">
+      <BuildableProductRunnable
+         runnableDebuggingMode = "0">
+         <BuildableReference
+            BuildableIdentifier = "primary"
+            BlueprintIdentifier = "C636435D2670E1B800301DC8"
+            BuildableName = "Download Full Installer.app"
+            BlueprintName = "Download Full Installer"
+            ReferencedContainer = "container:FetchInstallerPkg.xcodeproj">
+         </BuildableReference>
+      </BuildableProductRunnable>
+   </LaunchAction>
+   <ProfileAction
+      buildConfiguration = "Release"
+      shouldUseLaunchSchemeArgsEnv = "YES"
+      savedToolIdentifier = ""
+      useCustomWorkingDirectory = "NO"
+      debugDocumentVersioning = "YES">
+      <BuildableProductRunnable
+         runnableDebuggingMode = "0">
+         <BuildableReference
+            BuildableIdentifier = "primary"
+            BlueprintIdentifier = "C636435D2670E1B800301DC8"
+            BuildableName = "Download Full Installer.app"
+            BlueprintName = "Download Full Installer"
+            ReferencedContainer = "container:FetchInstallerPkg.xcodeproj">
+         </BuildableReference>
+      </BuildableProductRunnable>
+   </ProfileAction>
+   <AnalyzeAction
+      buildConfiguration = "Debug">
+   </AnalyzeAction>
+   <ArchiveAction
+      buildConfiguration = "Release"
+      revealArchiveInOrganizer = "YES">
+   </ArchiveAction>
+</Scheme>

FetchInstallerPkg.xcodeproj/xcuserdata/armin.xcuserdatad/xcdebugger/Breakpoints_v2.xcbkptlist

@@ -30,8 +30,8 @@
             filePath = "FetchInstallerPkg/View/InstallerView.swift"
             startingColumnNumber = "9223372036854775807"
             endingColumnNumber = "9223372036854775807"
-            startingLineNumber = "51"
-            endingLineNumber = "51"
+            startingLineNumber = "88"
+            endingLineNumber = "88"
             landmarkName = "body"
             landmarkType = "24">
             <Actions>

FetchInstallerPkg/DownloadManager.swift

@@ -23,7 +23,17 @@ import AppKit
 
     static let shared = DownloadManager()
 
-    func download(url: URL?) {
+    var fileExists: Bool {
+        let destination = Prefs.downloadURL
+        if self.filename != nil {
+            let file = destination.appendingPathComponent(filename!)
+            return FileManager.default.fileExists(atPath: file.path)
+        } else {
+            return false
+        }
+    }
+    
+    func download(url: URL?, replacing: Bool = false) throws {
         // reset the variables
         progress = 0.0
         isDownloading = true
@@ -33,6 +43,13 @@ import AppKit
 
         byteFormatter.countStyle = .file
 
+        if replacing {
+            let destination = Prefs.downloadURL
+            let suggestedFilename = filename ?? "InstallerAssistant.pkg"
+            let file = destination.appendingPathComponent(suggestedFilename)
+            try FileManager.default.removeItem(at: file)
+        }
+        
         if url != nil {
             downloadTask = urlSession.downloadTask(with: url!)
             downloadTask!.resume()
@@ -51,20 +68,16 @@ import AppKit
 
     func revealInFinder() {
         if isComplete {
-            guard let destination = FileManager.default.urls(for: .downloadsDirectory, in: .userDomainMask).first else { return }
-            NSWorkspace.shared.selectFile(localURL?.path, inFileViewerRootedAtPath: destination.path)
+            let destination = Prefs.downloadPath
+            NSWorkspace.shared.selectFile(localURL?.path, inFileViewerRootedAtPath: destination)
         }
     }
 }
 
 extension DownloadManager : URLSessionDownloadDelegate {
     func urlSession(_ session: URLSession, downloadTask: URLSessionDownloadTask, didFinishDownloadingTo location: URL) {
         NSLog("urlSession, didFinishDownloading")
-        guard
-            let destination = FileManager.default.urls(for: .downloadsDirectory, in: .userDomainMask).first
-        else {
-            return
-        }
+        let destination = Prefs.downloadURL
 
         // get the suggest file name or create a uuid string
         let suggestedFilename = filename ?? downloadTask.response?.suggestedFilename ?? UUID().uuidString

FetchInstallerPkg/View/InstallerView.swift

@@ -10,6 +10,10 @@ import SwiftUI
 struct InstallerView: View {
     @ObservedObject var product: Product
     @StateObject var downloadManager = DownloadManager.shared
+    @State var isReplacingFile = false
+    @State var failed = false
+    @State var filename = "InstallerAssistant.pkg"
+    
     var body: some View {
         if product.isLoading {
             Text("Loading...")
@@ -37,11 +41,44 @@ struct InstallerView: View {
 
 
                 Button(action: {
-                    DownloadManager.shared.filename = "InstallAssistant-\(product.productVersion ?? "V")-\(product.buildVersion ?? "B").pkg"
-                    DownloadManager.shared.download(url: product.installAssistantURL)
+                    filename = "InstallAssistant-\(product.productVersion ?? "V")-\(product.buildVersion ?? "B").pkg"
+                    downloadManager.filename = filename
+                    isReplacingFile = downloadManager.fileExists
+                    
+                    if !isReplacingFile {
+                        do {
+                            try downloadManager.download(url: product.installAssistantURL)
+                        } catch {
+                            failed = true
+                        }
+                    }
+                    
                 }) {
                     Image(systemName: "arrow.down.circle").font(.title)
                 }
+                .alert(isPresented: $isReplacingFile) {
+                    Alert(
+                        title: Text("“\(filename)” already exists! Do you want to replace it?"),
+                        message: Text("A file with the same name already exists in that location. Replacing it will overwrite its current contents."),
+                        primaryButton: .cancel(Text("Cancel")),
+                        secondaryButton: .destructive(
+                            Text("Replace"),
+                            action: {
+                        do {
+                            try downloadManager.download(url:  product.installAssistantURL, replacing: true)
+                        } catch {
+                            failed = true
+                        }
+                    }
+                        )
+                    )
+                }
+//                .alert(isPresented: $failed) {
+//                    Alert(
+//                        title: Text("An error occured while downloading"),
+//                        message: Text("Please try again or restart the application.")
+//                    )
+//                }
                 .disabled(downloadManager.isDownloading)
                 .buttonStyle(.borderless)
                 .controlSize(/*@START_MENU_TOKEN@*/.large/*@END_MENU_TOKEN@*/)