Add DoctorAlertView.swift

src/apps/SettingsWindow/src/ContentViewStates.swift

@@ -10,6 +10,7 @@ final class ContentViewStates: ObservableObject {
   @Published public var showDriverNotActivatedAlert = false
   @Published public var showDriverVersionMismatchedAlert = false
   @Published public var showInputMonitoringPermissionsAlert = false
+  @Published public var showDoctorAlert = false
 
   //
   // ContentMainView

src/apps/SettingsWindow/src/View/ContentView.swift

@@ -17,6 +17,9 @@ struct ContentView: View {
         .alert(
           isPresented: contentViewStates.showInputMonitoringPermissionsAlert
         ) { InputMonitoringPermissionsAlertView() }
+        .alert(
+          isPresented: contentViewStates.showDoctorAlert
+        ) { DoctorAlertView() }
     }
     .frame(
       minWidth: 1100,

src/apps/SettingsWindow/src/View/DoctorAlertView.swift

@@ -0,0 +1,71 @@
+import SwiftUI
+
+struct DoctorAlertView: View {
+  @ObservedObject private var doctor = Doctor.shared
+
+  var body: some View {
+    ZStack(alignment: .topLeading) {
+      VStack(alignment: .center, spacing: 20.0) {
+        if !doctor.userPIDDirectoryWritable {
+          Label(
+            "Unable to write files to the working folder.",
+            systemImage: "exclamationmark.triangle"
+          )
+          .font(.system(size: 24))
+
+          GroupBox {
+            VStack(alignment: .leading, spacing: 0.0) {
+              Text(
+                "Karabiner-Elements failed to write a file to $HOME/.local/share/karabiner folder."
+              )
+              Text("Typically this is due to incorrect permissions on the $HOME/.local folder.")
+              Text("Make sure you have a permission to write $HOME/.local/share/karabiner.")
+            }
+            .padding()
+          }
+
+          GroupBox(label: Text("How to check the permission")) {
+            VStack(alignment: .leading, spacing: 10.0) {
+              HStack {
+                Text("1. Open Home folder in Finder")
+
+                Button(
+                  action: { openHomeDirectory() },
+                  label: {
+                    Label(
+                      "Open Home folder...",
+                      systemImage: "arrow.forward.circle.fill")
+                  })
+              }
+
+              Text("2. Press Command + Shift + . (period) to show hidden files")
+
+              Text("3. Find .local folder, and choose \"Get Info\" from Menu")
+
+            }
+            .padding()
+          }
+        }
+      }
+      .padding()
+      .frame(width: 850)
+
+      SheetCloseButton {
+        ContentViewStates.shared.showDoctorAlert = false
+      }
+    }
+  }
+
+  private func openHomeDirectory() {
+    NSWorkspace.shared.open(FileManager.default.homeDirectoryForCurrentUser)
+  }
+}
+
+struct DoctorAlertView_Previews: PreviewProvider {
+  static var previews: some View {
+    Group {
+      DoctorAlertView()
+        .previewLayout(.sizeThatFits)
+    }
+  }
+}