feat: Display battery information of a Apple laptop

README.md

@@ -1,2 +1,38 @@
 # Alfred Battery
 
+Display battery information of your Apple laptop in Alfred
+
+![][demo]
+
+Alfred Battery shows:
+
+- the current charging state
+- the remaining time until full or empty
+- the tempertature
+- the charging cycles
+- the health
+- as well as the serial number
+
+Alfred Battery uses a a [built-in Swift][built-in-swift] programm to retive the battery information from the system.
+
+## Dependencies
+
+The Alfred Battery workflow dependes on a [python3.7+][python] installation. Install `python3` e.g. via. [Homebrew][homebrew] `brew install python`.
+
+Additionaly during the first execution and after an update of the workflow, the workflow compiles the `BatteryInfo` programm. This programm dependes on swift and the macOS `command line tools`. [freeCodeCamp tutorial][command-line-tutorial]
+
+## Licence, thanks
+
+The workflow code, the bundeled [Alfred-PyWorkflow][alfred-pyworkflow] library as well as the graphics are all under the [MIT Licence][mit-licence].
+
+The original idea is from [BenziAhamed][benzi-ahamed] and his [Battery workflow][benzi-ahamed-alfred-battery]
+
+[alfred-pyworkflow]: https://github.com/harrtho/alfred-pyworkflow
+[benzi-ahamed-alfred-battery]: https://github.com/BenziAhamed/alfred-battery
+[benzi-ahamed]: https://github.com/BenziAhamed
+[built-in-swift]: src/BatteryInfo.swift
+[command-line-tutorial]: https://www.freecodecamp.org/news/install-xcode-command-line-tools/
+[demo]: demo.gif
+[homebrew]: https://brew.sh
+[mit-licence]: http://opensource.org/licenses/MIT
+[python]: https://www.python.org

src/BatteryInfo.swift

@@ -0,0 +1,86 @@
+//
+//  BarreryInfo.swift
+//
+//  Copyright (c) 2023 Thomas Harr <[email protected]>
+//
+//  MIT Licence. See http://opensource.org/licenses/MIT
+//
+//  Created on 2023-01-03
+//
+
+import IOKit
+import Foundation
+
+
+func convertJSONSerializable(rawValue: Any) -> Any {
+    switch rawValue {
+    case is NSNumber:
+        return rawValue as! NSNumber
+    case is NSString:
+        return rawValue as! NSString
+    case is NSArray:
+        let rawArray = rawValue as! NSArray
+        let arr = NSMutableArray()
+        for rawEntry in rawArray {
+            arr.add(convertJSONSerializable(rawValue: rawEntry))
+        }
+        return arr
+    case is NSDictionary:
+        let rawDictionary = rawValue as! NSDictionary
+        let dict = NSMutableDictionary()
+        for (rawDictKey, rawDictValue) in rawDictionary {
+            dict[convertJSONSerializable(rawValue: rawDictKey)] = convertJSONSerializable(rawValue: rawDictValue)
+        }
+        return dict
+    case is NSData:
+        return (rawValue as! NSData).hexEncodedString()
+    default:
+        return NSString(format: "Unknown type: '%s'", String(describing: type(of: rawValue)))
+    }
+}
+
+
+extension NSData {
+    struct HexEncodingOptions: OptionSet {
+        let rawValue: Int
+        static let upperCase = HexEncodingOptions(rawValue: 1 << 0)
+    }
+
+    func hexEncodedString(options: HexEncodingOptions = []) -> String {
+        let format = options.contains(.upperCase) ? "%02hhX" : "%02hhx"
+        return self.map { String(format: format, $0) }.joined()
+    }
+}
+
+
+var serviceIterator: io_iterator_t = io_iterator_t()
+
+var waittime = mach_timespec_t(tv_sec: 1,tv_nsec: 0)
+IOServiceWaitQuiet(kIOMainPortDefault, &waittime)
+
+if (IOServiceGetMatchingServices(kIOMainPortDefault, IOServiceNameMatching("AppleSmartBattery"), &serviceIterator) == kIOReturnSuccess) {
+    IOIteratorReset(serviceIterator)
+
+    repeat {
+        let service: io_service_t = IOIteratorNext(serviceIterator)
+        // Check if there is a service
+        guard service != 0 else {
+            break
+        }
+
+        var serviceProperties: Unmanaged<CFMutableDictionary>?
+        IORegistryEntryCreateCFProperties(service, &serviceProperties, kCFAllocatorDefault, 0)
+        let serviceEntries = NSDictionary(dictionary:(serviceProperties?.takeUnretainedValue())!)
+
+        do {
+            let batteryData = try JSONSerialization.data(withJSONObject: convertJSONSerializable(rawValue: serviceEntries))
+            print(NSString(data: batteryData, encoding: String.Encoding.utf8.rawValue)! as String)
+        } catch {
+            print(error)
+        }
+
+        serviceProperties?.release()
+        IOObjectRelease(service)
+
+    } while(IOIteratorIsValid(serviceIterator) == boolean_t(truncating: true))
+}