feat: add system theme toggle command

Sources/Conjure/LauncherWindowController.swift

@@ -38,6 +38,7 @@ final class LauncherWindowController: NSWindowController, NSWindowDelegate, NSSe
     private var emojiPicker: EmojiPickerController?
     private var notes: NotesController?
     private let notesDirectory: URL?
+    private let toggleSystemTheme: @MainActor () async throws -> Void
     private var isCommandOpen: Bool { activeCommand != nil }
     private var activeCommand: Application.Command?
     private var pendingPresentation: (() -> Void)?
@@ -59,12 +60,14 @@ final class LauncherWindowController: NSWindowController, NSWindowDelegate, NSSe
     }
 
     init(history: LaunchHistory = LaunchHistory(), uninstaller: ApplicationUninstaller = ApplicationUninstaller(),
-         defaults: UserDefaults = .standard, pasteboard: NSPasteboard = .general, notesDirectory: URL? = nil) {
+         defaults: UserDefaults = .standard, pasteboard: NSPasteboard = .general, notesDirectory: URL? = nil,
+         toggleSystemTheme: @escaping @MainActor () async throws -> Void = { try await SystemTheme.toggle() }) {
         self.history = history
         self.uninstaller = uninstaller
         self.defaults = defaults
         self.pasteboard = pasteboard
         self.notesDirectory = notesDirectory
+        self.toggleSystemTheme = toggleSystemTheme
         let window = LauncherPanel(
             contentRect: NSRect(x: 0, y: 0, width: 750, height: 474),
             styleMask: [.borderless],
@@ -145,7 +148,6 @@ final class LauncherWindowController: NSWindowController, NSWindowDelegate, NSSe
         updateResults()
         if let command {
             showCommand(command)
-            history.recordLaunch(of: Application(command: command))
         }
         window?.deminiaturize(nil)
         showWindow(nil)
@@ -558,11 +560,14 @@ final class LauncherWindowController: NSWindowController, NSWindowDelegate, NSSe
             case .notes:
                 cell.imageView?.image = Self.notesIcon
                 cell.toolTip = "Write notes with Markdown and images"
+            case .toggleTheme:
+                cell.imageView?.image = NSImage(systemSymbolName: "circle.lefthalf.filled", accessibilityDescription: nil)
+                cell.toolTip = "Switch macOS between light and dark appearance"
             default:
                 cell.imageView?.image = Self.translateIcon
                 cell.toolTip = "Translate English to Japanese"
             }
-            cell.imageView?.contentTintColor = nil
+            cell.imageView?.contentTintColor = entry.command == .toggleTheme ? SunsetPalette.accent : nil
         } else {
             let application = results[row]
             cell.textField?.stringValue = application.name
@@ -734,7 +739,6 @@ final class LauncherWindowController: NSWindowController, NSWindowDelegate, NSSe
         guard !isLaunching, !isCommandOpen, launcherFrameBeforeReview == nil, window?.attachedSheet == nil else { return }
         if let command = application.command {
             showCommand(command)
-            history.recordLaunch(of: application)
             return
         }
         (window as? LauncherPanel)?.resetNumberHints()
@@ -800,9 +804,28 @@ final class LauncherWindowController: NSWindowController, NSWindowDelegate, NSSe
         return true
     }
 
+    private func toggleTheme() {
+        actions.close(animated: false)
+        isLaunching = true
+        updateOpenButton()
+        Task {
+            do {
+                try await toggleSystemTheme()
+                history.recordLaunch(of: Application(command: .toggleTheme))
+                isLaunching = false
+                dismiss()
+            } catch {
+                isLaunching = false
+                let alert = NSAlert(error: error)
+                alert.messageText = "Couldn’t toggle system theme"
+                if let window { await alert.beginSheetModal(for: window) }
+            }
+            updateOpenButton()
+        }
+    }
+
     private func showCommand(_ command: Application.Command) {
         guard !isCommandOpen, let content = window?.contentView else { return }
-        activeCommand = command
         let controller: NSViewController
         let placeholder: String
         let accessibilityLabel: String
@@ -841,7 +864,12 @@ final class LauncherWindowController: NSWindowController, NSWindowDelegate, NSSe
             controller = tool
             placeholder = "Conjure Notes"
             accessibilityLabel = "Conjure Notes"
+        case .toggleTheme:
+            toggleTheme()
+            return
         }
+        activeCommand = command
+        history.recordLaunch(of: Application(command: command))
         let previousQuery = searchField.stringValue
         let previousPlaceholder = searchField.placeholderAttributedString
         let close: () -> Void = { [weak self, weak controller] in

Sources/Conjure/SystemTheme.swift

@@ -0,0 +1,28 @@
+import Foundation
+
+enum SystemTheme {
+    static func toggle() async throws {
+        try await Task.detached {
+            guard let script = NSAppleScript(source: """
+                tell application "System Events"
+                    tell appearance preferences
+                        set dark mode to not dark mode
+                    end tell
+                end tell
+                """) else {
+                throw NSError(domain: "Conjure.SystemTheme", code: 1, userInfo: [
+                    NSLocalizedDescriptionKey: "Couldn’t create the system appearance script.",
+                ])
+            }
+            var error: NSDictionary?
+            script.executeAndReturnError(&error)
+            if let error {
+                let code = error[NSAppleScript.errorNumber] as? Int ?? 1
+                let message = code == -1743
+                    ? "Allow Conjure to control System Events in System Settings → Privacy & Security → Automation, then try again."
+                    : error[NSAppleScript.errorMessage] as? String ?? "macOS couldn’t change the system appearance."
+                throw NSError(domain: "Conjure.SystemTheme", code: code, userInfo: [NSLocalizedDescriptionKey: message])
+            }
+        }.value
+    }
+}

Sources/ConjureKit/Applications.swift

@@ -5,6 +5,7 @@ public struct Application: Identifiable, Sendable {
         case translate
         case emoji
         case notes
+        case toggleTheme
     }
     public static let commands = Command.allCases.map { Application(command: $0) }
     public let command: Command?
@@ -22,6 +23,7 @@ public struct Application: Identifiable, Sendable {
         case .translate: "Conjure Translate"
         case .emoji: "Conjure Emoji"
         case .notes: "Conjure Notes"
+        case .toggleTheme: "Conjure Toggle Light/Dark Theme"
         }
         self.init(canonicalURL: URL(string: "conjure-command://\(command.rawValue)")!, name: name, command: command)
     }