ability to set selection fg/bg colors

src/Window.zig

@@ -294,6 +294,7 @@ pub fn create(alloc: Allocator, app: *App, config: *const Config) !*Window {
 
     // Create our terminal grid with the initial window size
     var renderer_impl = try Renderer.init(alloc, .{
+        .config = config,
         .font_group = font_group,
         .padding = .{
             .explicit = padding,
@@ -302,16 +303,6 @@ pub fn create(alloc: Allocator, app: *App, config: *const Config) !*Window {
         .window_mailbox = .{ .window = self, .app = app.mailbox },
     });
     errdefer renderer_impl.deinit();
-    renderer_impl.background = .{
-        .r = config.background.r,
-        .g = config.background.g,
-        .b = config.background.b,
-    };
-    renderer_impl.foreground = .{
-        .r = config.foreground.r,
-        .g = config.foreground.g,
-        .b = config.foreground.b,
-    };
 
     // Calculate our grid size based on known dimensions.
     const window_size = try window.getSize();

src/config.zig

@@ -36,6 +36,12 @@ pub const Config = struct {
     /// Foreground color for the window.
     foreground: Color = .{ .r = 0xFF, .g = 0xFF, .b = 0xFF },
 
+    /// The foreground and background color for selection. If this is not
+    /// set, then the selection color is just the inverted window background
+    /// and foreground (note: not to be confused with the cell bg/fg).
+    @"selection-foreground": ?Color = null,
+    @"selection-background": ?Color = null,
+
     /// Color palette for the 256 color form that many terminal applications
     /// use. The syntax of this configuration is "N=HEXCODE" where "n"
     /// is 0 to 255 (for the 256 colors) and HEXCODE is a typical RGB
@@ -316,6 +322,11 @@ pub const Color = struct {
         InvalidFormat,
     };
 
+    /// Convert this to the terminal RGB struct
+    pub fn toTerminalRGB(self: Color) terminal.color.RGB {
+        return .{ .r = self.r, .g = self.g, .b = self.b };
+    }
+
     pub fn parseCLI(input: ?[]const u8) !Color {
         return fromHex(input orelse return error.ValueRequired);
     }

src/renderer/Metal.zig

@@ -54,6 +54,10 @@ foreground: terminal.color.RGB,
 /// Default background color
 background: terminal.color.RGB,
 
+/// Default selection color
+selection_background: ?terminal.color.RGB,
+selection_foreground: ?terminal.color.RGB,
+
 /// The current set of cells to render. This is rebuilt on every frame
 /// but we keep this around so that we don't reallocate. Each set of
 /// cells goes into a separate shader.
@@ -233,11 +237,19 @@ pub fn init(alloc: Allocator, options: renderer.Options) !Metal {
         .window_mailbox = options.window_mailbox,
         .cell_size = .{ .width = metrics.cell_width, .height = metrics.cell_height },
         .padding = options.padding,
-        .background = .{ .r = 0, .g = 0, .b = 0 },
-        .foreground = .{ .r = 255, .g = 255, .b = 255 },
         .focused = true,
         .cursor_visible = true,
         .cursor_style = .box,
+        .background = options.config.background.toTerminalRGB(),
+        .foreground = options.config.foreground.toTerminalRGB(),
+        .selection_background = if (options.config.@"selection-background") |bg|
+            bg.toTerminalRGB()
+        else
+            null,
+        .selection_foreground = if (options.config.@"selection-foreground") |bg|
+            bg.toTerminalRGB()
+        else
+            null,
 
         // Render state
         .cells_bg = .{},
@@ -821,8 +833,8 @@ pub fn updateCell(
             // If we are selected, we our colors are just inverted fg/bg
             if (sel.contains(screen_point)) {
                 break :colors BgFg{
-                    .bg = self.foreground,
-                    .fg = self.background,
+                    .bg = self.selection_background orelse self.foreground,
+                    .fg = self.selection_foreground orelse self.background,
                 };
             }
         }

src/renderer/OpenGL.zig

@@ -77,6 +77,10 @@ foreground: terminal.color.RGB,
 /// Default background color
 background: terminal.color.RGB,
 
+/// Default selection color
+selection_background: ?terminal.color.RGB,
+selection_foreground: ?terminal.color.RGB,
+
 /// True if the window is focused
 focused: bool,
 
@@ -296,8 +300,16 @@ pub fn init(alloc: Allocator, options: renderer.Options) !OpenGL {
         .font_shaper = shaper,
         .cursor_visible = true,
         .cursor_style = .box,
-        .background = .{ .r = 0, .g = 0, .b = 0 },
-        .foreground = .{ .r = 255, .g = 255, .b = 255 },
+        .background = options.config.background.toTerminalRGB(),
+        .foreground = options.config.foreground.toTerminalRGB(),
+        .selection_background = if (options.config.@"selection-background") |bg|
+            bg.toTerminalRGB()
+        else
+            null,
+        .selection_foreground = if (options.config.@"selection-foreground") |bg|
+            bg.toTerminalRGB()
+        else
+            null,
         .focused = true,
         .padding = options.padding,
         .window_mailbox = options.window_mailbox,
@@ -865,11 +877,11 @@ pub fn updateCell(
                 .y = y,
             }).toScreen(screen);
 
-            // If we are selected, we our colors are just inverted fg/bg
+            // If we are selected, we use the selection colors
             if (sel.contains(screen_point)) {
                 break :colors BgFg{
-                    .bg = self.foreground,
-                    .fg = self.background,
+                    .bg = self.selection_background orelse self.foreground,
+                    .fg = self.selection_foreground orelse self.background,
                 };
             }
         }

src/renderer/Options.zig

@@ -3,6 +3,10 @@
 const font = @import("../font/main.zig");
 const renderer = @import("../renderer.zig");
 const Window = @import("../Window.zig");
+const Config = @import("../config.zig").Config;
+
+/// The app configuration.
+config: *const Config,
 
 /// The font group that should be used.
 font_group: *font.GroupCache,