Initial

src/Info.plist

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+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>CFBundleIdentifier</key>
+	<string>de.relikd.Darker</string>
+	<key>CFBundleExecutable</key>
+	<string>Darker</string>
+	<key>CFBundleName</key>
+	<string>Darker</string>
+	<key>CFBundleIconFile</key>
+	<string>AppIcon</string>
+	<key>CFBundleInfoDictionaryVersion</key>
+	<string>6.0</string>
+	<key>CFBundlePackageType</key>
+	<string>APPL</string>
+	<key>CFBundleShortVersionString</key>
+	<string>1.0</string>
+	<key>CFBundleVersion</key>
+	<string>42</string>
+	<key>LSMinimumSystemVersion</key>
+	<string>10.10</string>
+	<key>LSBackgroundOnly</key>
+	<true/>
+	<key>LSUIElement</key>
+	<true/>
+	<key>NSHighResolutionCapable</key>
+	<true/>
+	<key>NSSupportsSuddenTermination</key>
+	<true/>
+	<key>NSPrincipalClass</key>
+	<string>NSApplication</string>
+	<key>NSHumanReadableCopyright</key>
+	<string>Copyright © 2023 relikd.</string>
+</dict>
+</plist>

src/main.swift

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+#!/usr/bin/env swift
+import ApplicationServices
+import Cocoa
+import AppKit
+
+class AppDelegate: NSObject, NSApplicationDelegate {
+	private var statusItem: NSStatusItem!
+	private var value: Float = 1.0
+
+	func applicationDidFinishLaunching(_ aNotification: Notification) {
+		UserDefaults.standard.register(defaults: ["value": 1.0])
+		value = UserDefaults.standard.float(forKey: "value")
+		updateGamma()
+		// create status menu icon
+		self.statusItem = NSStatusBar.system.statusItem(withLength: NSStatusItem.variableLength)
+		self.statusItem.button?.image = NSImage.statusIcon
+		self.statusItem.menu = NSMenu(title: "")
+		self.statusItem.menu!.addItem(sliderMenuItem())
+		self.statusItem.menu!.addItem(NSMenuItem.separator())
+		self.statusItem.menu!.addItem(withTitle: "Quit", action: #selector(NSApp.terminate), keyEquivalent: "q")
+	}
+	
+	private func sliderMenuItem() -> NSMenuItem {
+		let slider = NSSlider(frame: NSRect(x: 10, y: 5, width: 150, height: 0))
+		slider.frame.size.height = slider.fittingSize.height
+		slider.target = self
+		slider.action = #selector(sliderCallback)
+		slider.floatValue = value
+		slider.numberOfTickMarks = 9
+		slider.allowsTickMarkValuesOnly = true
+		let item = NSMenuItem()
+		item.view = NSView(frame: slider.frame.insetBy(dx: -10, dy: -5)) // add padding
+		item.view!.addSubview(slider)
+		return item
+	}
+
+	@objc
+	private func sliderCallback(sender: NSSlider) {
+		value = max(sender.floatValue, 0.1)  // safety measure, never get venta black
+		UserDefaults.standard.setValue(value, forKey: "value")
+		updateGamma()
+	}
+	
+	private func updateGamma() {
+		let table: [CGGammaValue] = [0, value]
+		CGSetDisplayTransferByTable(CGMainDisplayID(), 2, table, table, table)
+		
+	}
+}
+
+// MARK: - Menu Bar Icon -
+
+extension NSImage {
+	static var statusIcon: NSImage {
+		let img = NSImage(size: .init(width: 16, height: 16), flipped: true) { rect in
+			let icon = UserDefaults.standard.integer(forKey: "icon")
+			let w = min(rect.width, rect.height)
+			let ctx = NSGraphicsContext.current!.cgContext
+			// clip to circle
+			ctx.addEllipse(in: rect)
+			ctx.clip()
+			// draw moon
+			if icon == 0 || icon == 1 {
+				ctx.addRect(rect)
+				ctx.addEllipse(in: .init(x: 0.3 * w, y: -0.1 * w, width: 0.84 * w, height: 0.84 * w))
+				ctx.fillPath(using: .evenOdd)
+			}
+			// draw stripes background
+			if icon == 0 || icon == 2 {
+				ctx.setFillColor(gray: 1.0, alpha: 0.2)
+				ctx.addRect(rect); ctx.fillPath()
+				ctx.addRect(rect.offsetBy(dx: 0, dy: 0.2 * rect.height)); ctx.fillPath()
+				ctx.addRect(rect.offsetBy(dx: 0, dy: 0.45 * rect.height)); ctx.fillPath()
+				ctx.addRect(rect.offsetBy(dx: 0, dy: 0.7 * rect.height)); ctx.fillPath()
+			}
+			return true
+		}
+		img.isTemplate = true
+		return img
+	}
+}
+
+// MARK: - Main Entry
+
+let delegate = AppDelegate()
+NSApplication.shared.delegate = delegate
+NSApplication.shared.run()
+// _ = NSApplicationMain(CommandLine.argc, CommandLine.unsafeArgv)