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// The global shortcut and the settings file it comes from.
//
// The shortcut uses Carbon's RegisterEventHotKey: no Accessibility or Input
// Monitoring permission, the key is consumed, and a clash with another app
// is reported instead of failing silently.
import AppKit
import Carbon.HIToolbox
// MARK: settings file
struct Settings: Equatable {
var hotkey = "ctrl+opt+cmd+e"
static var directory: String {
environment["DINGGER_CONFIG_DIR"] ?? (NSHomeDirectory() + "/.config/dingger")
}
static var path: String { directory + "/config.toml" }
static let template = """
# dingger settings. The menu bar app reloads this file when you save it.
[panel]
# Global shortcut that shows or hides the floating panel.
# Modifiers: ctrl, opt, cmd, shift. Keys: a-z, 0-9, f1-f12, space.
hotkey = "ctrl+opt+cmd+e"
"""
/// Create the file with defaults and comments if it does not exist yet.
static func ensureFile() {
guard !FileManager.default.fileExists(atPath: path) else { return }
try? FileManager.default.createDirectory(atPath: directory, withIntermediateDirectories: true)
try? template.write(toFile: path, atomically: true, encoding: .utf8)
}
/// Read `key = "value"` lines; unknown keys are ignored.
static func load() -> Settings {
var settings = Settings()
guard let text = try? String(contentsOfFile: path, encoding: .utf8) else { return settings }
for line in text.split(separator: "\n") {
let parts = line.split(separator: "=", maxSplits: 1).map {
$0.trimmingCharacters(in: .whitespaces)
}
guard parts.count == 2, !parts[0].hasPrefix("#") else { continue }
let value = parts[1].trimmingCharacters(in: CharacterSet(charactersIn: "\""))
if parts[0] == "hotkey" { settings.hotkey = value }
}
return settings
}
static func modified() -> Date? {
(try? FileManager.default.attributesOfItem(atPath: path))?[.modificationDate] as? Date
}
}
// MARK: shortcut parsing
struct Hotkey: Equatable {
let keyCode: UInt32
let carbonModifiers: UInt32
let modifierFlags: NSEvent.ModifierFlags
let key: String
/// How macOS writes the shortcut, e.g. "⌃⌥⌘E".
var display: String {
var text = ""
if modifierFlags.contains(.control) { text += "⌃" }
if modifierFlags.contains(.option) { text += "⌥" }
if modifierFlags.contains(.shift) { text += "⇧" }
if modifierFlags.contains(.command) { text += "⌘" }
return text + key.uppercased()
}
private static let keyCodes: [String: Int] = {
var codes: [String: Int] = [
"a": kVK_ANSI_A, "b": kVK_ANSI_B, "c": kVK_ANSI_C, "d": kVK_ANSI_D, "e": kVK_ANSI_E,
"f": kVK_ANSI_F, "g": kVK_ANSI_G, "h": kVK_ANSI_H, "i": kVK_ANSI_I, "j": kVK_ANSI_J,
"k": kVK_ANSI_K, "l": kVK_ANSI_L, "m": kVK_ANSI_M, "n": kVK_ANSI_N, "o": kVK_ANSI_O,
"p": kVK_ANSI_P, "q": kVK_ANSI_Q, "r": kVK_ANSI_R, "s": kVK_ANSI_S, "t": kVK_ANSI_T,
"u": kVK_ANSI_U, "v": kVK_ANSI_V, "w": kVK_ANSI_W, "x": kVK_ANSI_X, "y": kVK_ANSI_Y,
"z": kVK_ANSI_Z,
"0": kVK_ANSI_0, "1": kVK_ANSI_1, "2": kVK_ANSI_2, "3": kVK_ANSI_3, "4": kVK_ANSI_4,
"5": kVK_ANSI_5, "6": kVK_ANSI_6, "7": kVK_ANSI_7, "8": kVK_ANSI_8, "9": kVK_ANSI_9,
"space": kVK_Space,
]
let functionKeys = [kVK_F1, kVK_F2, kVK_F3, kVK_F4, kVK_F5, kVK_F6,
kVK_F7, kVK_F8, kVK_F9, kVK_F10, kVK_F11, kVK_F12]
for (index, code) in functionKeys.enumerated() { codes["f\(index + 1)"] = code }
return codes
}()
/// Parse "ctrl+opt+cmd+e". Requires at least one modifier and one key.
static func parse(_ spec: String) -> Hotkey? {
var carbon: UInt32 = 0
var flags: NSEvent.ModifierFlags = []
var key: String?
for part in spec.lowercased().split(separator: "+").map({ $0.trimmingCharacters(in: .whitespaces) }) {
switch part {
case "ctrl", "control": carbon |= UInt32(controlKey); flags.insert(.control)
case "opt", "option", "alt": carbon |= UInt32(optionKey); flags.insert(.option)
case "cmd", "command": carbon |= UInt32(cmdKey); flags.insert(.command)
case "shift": carbon |= UInt32(shiftKey); flags.insert(.shift)
default:
guard key == nil, keyCodes[part] != nil else { return nil }
key = part
}
}
guard let key, let code = keyCodes[key], carbon != 0 else { return nil }
return Hotkey(keyCode: UInt32(code), carbonModifiers: carbon, modifierFlags: flags, key: key)
}
}
// MARK: registration
/// One process-wide global shortcut.
enum GlobalHotkey {
private static var reference: EventHotKeyRef?
private static var action: (() -> Void)?
private static var handlerInstalled = false
/// Register `hotkey`, replacing any previous one. Returns false if another
/// app already owns the combination.
static func register(_ hotkey: Hotkey, action newAction: @escaping () -> Void) -> Bool {
unregister()
action = newAction
if !handlerInstalled {
var spec = EventTypeSpec(eventClass: OSType(kEventClassKeyboard),
eventKind: UInt32(kEventHotKeyPressed))
InstallEventHandler(GetApplicationEventTarget(), { _, _, _ in
DispatchQueue.main.async { GlobalHotkey.action?() }
return noErr
}, 1, &spec, nil, nil)
handlerInstalled = true
}
let id = EventHotKeyID(signature: OSType(0x4447_4752), id: 1) // "DGGR"
let status = RegisterEventHotKey(hotkey.keyCode, hotkey.carbonModifiers, id,
GetApplicationEventTarget(), 0, &reference)
return status == noErr
}
static func unregister() {
if let reference { UnregisterEventHotKey(reference) }
reference = nil
}
}
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