Uninstall a xcode version

Xcodes/Backend/AppState.swift

@@ -12,6 +12,7 @@ class AppState: ObservableObject {
     private let helperClient = HelperClient()
     private var cancellables = Set<AnyCancellable>()
     private var selectPublisher: AnyCancellable?
+    private var uninstallPublisher: AnyCancellable?
     
     @Published var authenticationState: AuthenticationState = .unauthenticated
     @Published var availableXcodes: [AvailableXcode] = [] {
@@ -32,7 +33,6 @@ class AppState: ObservableObject {
     @Published var presentingSignInAlert = false
     @Published var isProcessingAuthRequest = false
     @Published var secondFactorData: SecondFactorData?
-    @Published var xcodeBeingConfirmedForUninstallation: Xcode?
     @Published var helperInstallState: HelperInstallState = .notInstalled
     
     init() {
@@ -200,14 +200,36 @@ class AppState: ObservableObject {
             .store(in: &cancellables)
     }
     
-    // MARK: -
+    // MARK: - Install
     
     func install(id: Xcode.ID) {
         // TODO:
     }
     
+    // MARK: - Uninstall
     func uninstall(id: Xcode.ID) {
-        // TODO:
+        if helperInstallState == .notInstalled {
+            installHelper()
+        }
+        
+        guard
+            let installedXcode = Current.files.installedXcodes(Path.root/"Applications").first(where: { $0.version == id }),
+            uninstallPublisher == nil
+        else { return }
+        
+        uninstallPublisher = HelperClient().uninstallXcode(installedXcode.path)
+            .flatMap { [unowned self] _ in
+                self.updateSelectedXcodePath()
+            }
+            .sink(
+                receiveCompletion: { [unowned self] completion in
+                    if case let .failure(error) = completion {
+                        self.error = AlertContent(title: "Error uninstalling Xcode", message: error.legibleLocalizedDescription)
+                    }
+                    self.uninstallPublisher = nil
+                },
+                receiveValue: { _ in }
+        )
     }
     
     func reveal(id: Xcode.ID) {

Xcodes/Backend/HelperClient.swift

@@ -1,5 +1,6 @@
 import Combine
 import Foundation
+import Path
 
 final class HelperClient {
     private var connection: NSXPCConnection?
@@ -103,4 +104,27 @@ final class HelperClient {
         .map { $0.0 }
         .eraseToAnyPublisher()
     }
+    
+    func uninstallXcode(_ path: Path) -> AnyPublisher<Void, Error> {
+        let connectionErrorSubject = PassthroughSubject<String, Error>()
+        
+        return Deferred {
+            Future { promise in
+                do {
+                    try Current.files.trashItem(at: path.url)
+                    promise(.success(()))
+                } catch {
+                    promise(.failure(error))
+                }
+            }
+        }
+        // Take values, but fail when connectionErrorSubject fails
+        .zip(
+            connectionErrorSubject
+                .prepend("")
+                .map { _ in Void() }
+        )
+        .map { $0.0 }
+        .eraseToAnyPublisher()
+    }
 }

Xcodes/Backend/XcodeCommands.swift

@@ -9,6 +9,7 @@ struct XcodeCommands: Commands {
     var body: some Commands {
         CommandMenu("Xcode") {
             Group {
+                
                 InstallCommand()
                 
                 Divider()
@@ -17,6 +18,7 @@ struct XcodeCommands: Commands {
                 OpenCommand()
                 RevealCommand()
                 CopyPathCommand()
+                UninstallCommand()
             }
             .environmentObject(appState)
         }
@@ -31,24 +33,15 @@ struct InstallButton: View {
     let xcode: Xcode?
     
     var body: some View {
-        Button(action: uninstallOrInstall) {
-            if let xcode = xcode {
-                Text(xcode.installed == true ? "Uninstall" : "Install")
-                    .help(xcode.installed == true ? "Uninstall" : "Install")
-            } else {
-                Text("Install")
-                    .help("Install")
-            }
+        Button(action: install) {
+            Text("Install")
+                .help("Install")
         }
     }
     
-    private func uninstallOrInstall() {
+    private func install() {
         guard let xcode = xcode else { return }
-        if xcode.installed {
-            appState.xcodeBeingConfirmedForUninstallation = xcode 
-        } else {
-            appState.install(id: xcode.id)
-        }
+        appState.install(id: xcode.id)
     }
 }
 
@@ -91,6 +84,30 @@ struct OpenButton: View {
     }
 }
 
+struct UninstallButton: View {
+    @EnvironmentObject var appState: AppState
+    let xcode: Xcode?
+    
+    @State private var showingAlert = false
+    var alert: Alert {
+        Alert(title: Text("Uninstall Xcode \(xcode!.description)?"),
+              message: Text("It will be moved to the Trash, but won't be emptied."),
+              primaryButton: .destructive(Text("Uninstall"), action: { self.appState.uninstall(id: xcode!.id) }),
+              secondaryButton: .cancel(Text("Cancel")))
+    }
+    
+    var body: some View {
+        Button(action: {
+            self.showingAlert = true
+        }) {
+            Text("Uninstall")
+        }
+        .foregroundColor(.red)
+        .help("Uninstall")
+        .alert(isPresented:$showingAlert, content: { self.alert })
+    }
+}
+
 struct RevealButton: View {
     @EnvironmentObject var appState: AppState
     let xcode: Xcode?
@@ -133,8 +150,8 @@ struct InstallCommand: View {
 
     var body: some View {
         InstallButton(xcode: selectedXcode.unwrapped)
-            .keyboardShortcut(selectedXcode.unwrapped?.installed == true ? "u" : "i", modifiers: [.command, .option])
-            .disabled(selectedXcode.unwrapped == nil)
+            .keyboardShortcut("i", modifiers: [.command, .option])
+            .disabled(selectedXcode.unwrapped?.installed == true)
     }
 }
 
@@ -181,3 +198,14 @@ struct CopyPathCommand: View {
             .disabled(selectedXcode.unwrapped?.installed != true)
     }
 }
+
+struct UninstallCommand: View {
+    @EnvironmentObject var appState: AppState
+    @FocusedValue(\.selectedXcode) private var selectedXcode: SelectedXcode?
+    
+    var body: some View {
+        UninstallButton(xcode: selectedXcode.unwrapped)
+            .keyboardShortcut("u", modifiers: [.command, .option])
+            .disabled(selectedXcode.unwrapped?.installed != true)
+    }
+}

Xcodes/Frontend/XcodeList/InfoPane.swift

@@ -50,6 +50,11 @@ struct InfoPane: View {
                     sdks(for: xcode)
                     compilers(for: xcode)
                     
+                    if xcode.path != nil {
+                        VStack(alignment: .leading) {
+                            UninstallButton(xcode: xcode)
+                        }
+                    }
                     Spacer()
                 }
             } else {
@@ -250,6 +255,21 @@ struct InfoPane_Previews: PreviewProvider {
                 })
                 .previewDisplayName("Populated, Uninstalled")
             
+            InfoPane(selectedXcodeID: Version(major: 12, minor: 3, patch: 0))
+                .environmentObject(configure(AppState()) {
+                    $0.allXcodes = [
+                        .init(
+                            version: Version(major: 12, minor: 3, patch: 0),
+                            installState: .installed,
+                            selected: false,
+                            path: "/Applications/Xcode-12.3.0.app",
+                            icon: nil,
+                            sdks: nil,
+                            compilers: nil)
+                    ]
+                })
+                .previewDisplayName("Basic, installed")
+            
             InfoPane(selectedXcodeID: nil)
                 .environmentObject(configure(AppState()) {
                     $0.allXcodes = [

Xcodes/Frontend/XcodeList/XcodeListViewRow.swift

@@ -26,15 +26,15 @@ struct XcodeListViewRow: View {
             installControl(for: xcode)
         }
         .contextMenu {
-            InstallButton(xcode: xcode)
-            
-            Divider()
-            
             if xcode.installed {
                 SelectButton(xcode: xcode)
                 OpenButton(xcode: xcode)
                 RevealButton(xcode: xcode)
                 CopyPathButton(xcode: xcode)
+                Divider()
+                UninstallButton(xcode: xcode)
+            } else {
+                InstallButton(xcode: xcode)
             }
         }
     }