macos: support the macos-icon configurations

macos/Sources/App/macOS/AppDelegate.swift

@@ -527,13 +527,19 @@ class AppDelegate: NSObject,
             GlobalEventTap.shared.disable()
         }
 
-        if let colorizedIcon = ColorizedGhosttyIcon(
-            screenColors: [],
-            ghostColor: .yellow
-        ).makeImage() {
-            self.appIcon = colorizedIcon
-        } else {
+        switch (config.macosIcon) {
+        case .official:
             self.appIcon = nil
+            break
+
+        case .customColor:
+            guard let ghostColor = config.macosIconGhostColor else { break }
+            guard let screenColors = config.macosIconScreenColor else { break }
+            guard let icon = ColorizedGhosttyIcon(
+                screenColors: screenColors,
+                ghostColor: ghostColor
+            ).makeImage() else { break }
+            self.appIcon = icon
         }
     }
 

macos/Sources/Ghostty/Ghostty.Config.swift

@@ -252,6 +252,35 @@ extension Ghostty {
             return v
         }
 
+        var macosIcon: MacOSIcon {
+            let defaultValue = MacOSIcon.official
+            guard let config = self.config else { return defaultValue }
+            var v: UnsafePointer<Int8>? = nil
+            let key = "macos-icon"
+            guard ghostty_config_get(config, &v, key, UInt(key.count)) else { return defaultValue }
+            guard let ptr = v else { return defaultValue }
+            let str = String(cString: ptr)
+            return MacOSIcon(rawValue: str) ?? defaultValue
+        }
+
+        var macosIconGhostColor: OSColor? {
+            guard let config = self.config else { return nil }
+            var v: ghostty_config_color_s = .init()
+            let key = "macos-icon-ghost-color"
+            guard ghostty_config_get(config, &v, key, UInt(key.count)) else { return nil }
+            return .init(ghostty: v)
+        }
+
+        var macosIconScreenColor: [OSColor]? {
+            guard let config = self.config else { return nil }
+            var v: ghostty_config_color_list_s = .init()
+            let key = "macos-icon-screen-color"
+            guard ghostty_config_get(config, &v, key, UInt(key.count)) else { return nil }
+            guard v.len > 0 else { return nil }
+            let buffer = UnsafeBufferPointer(start: v.colors, count: v.len)
+            return buffer.map { .init(ghostty: $0) }
+        }
+
         var focusFollowsMouse : Bool {
             guard let config = self.config else { return false }
             var v = false;

macos/Sources/Ghostty/Package.swift

@@ -195,6 +195,12 @@ extension Ghostty {
         }
     }
 
+    /// macos-icon
+    enum MacOSIcon: String {
+        case official
+        case customColor = "custom-color"
+    }
+
     /// Enum for the macos-titlebar-proxy-icon config option
     enum MacOSTitlebarProxyIcon: String {
         case visible

macos/Sources/Helpers/OSColor+Extension.swift

@@ -1,4 +1,5 @@
 import Foundation
+import GhosttyKit
 
 extension OSColor {
     var isLightColor: Bool {
@@ -89,3 +90,15 @@ extension OSColor {
         )
     }
 }
+
+// MARK: Ghostty Types
+
+extension OSColor {
+    /// Create a color from a Ghostty color.
+    convenience init(ghostty: ghostty_config_color_s) {
+        let red = Double(ghostty.r) / 255
+        let green = Double(ghostty.g) / 255
+        let blue = Double(ghostty.b) / 255
+        self.init(red: red, green: green, blue: blue, alpha: 1)
+    }
+}

src/config/Config.zig

@@ -3704,8 +3704,8 @@ pub const ColorList = struct {
         const input = input_ orelse return error.ValueRequired;
         if (input.len == 0) return error.ValueRequired;
 
-        // Whenever a color list is set, we reset the list
-        self.colors.clearRetainingCapacity();
+        // Always reset on parse
+        self.* = .{};
 
         // Split the input by commas and parse each color
         var it = std.mem.tokenizeScalar(u8, input, ',');