From 2d7e2c8345e0b77740f02566ad34cefdae91c983 Mon Sep 17 00:00:00 2001
From: Hanna <hanna@hanna.lol>
Date: Thu, 2 Nov 2023 21:29:29 -0700
Subject: [PATCH] Integrate libadwaita for the gtk backend (#792)

* When using gtk as the backend, link libadwaita

* Update c.zig

* Use libadwaita's theme manager for gtk

* update the documentation for window-theme

* build: add libadwaita to the nix devshell

* forgot to properly import libadwaita

* apprt/gtk: adwaita style change

---------

Co-authored-by: Mitchell Hashimoto <mitchell.hashimoto@gmail.com>
---
 build.zig             |  1 +
 nix/devshell.nix      |  3 +++
 src/apprt/gtk/App.zig | 13 +++++++++++++
 src/apprt/gtk/c.zig   |  1 +
 src/config/Config.zig |  2 +-
 5 files changed, 19 insertions(+), 1 deletion(-)

diff --git a/build.zig b/build.zig
index cc914dca2..7b7f0ce94 100644
--- a/build.zig
+++ b/build.zig
@@ -814,6 +814,7 @@ fn addDeps(
 
             .gtk => {
                 step.linkSystemLibrary2("gtk4", dynamic_link_opts);
+                step.linkSystemLibrary2("adwaita-1", dynamic_link_opts);
             },
         }
     }
diff --git a/nix/devshell.nix b/nix/devshell.nix
index 78d8de6fb..5804cceb5 100644
--- a/nix/devshell.nix
+++ b/nix/devshell.nix
@@ -28,6 +28,7 @@
 , freetype
 , glib
 , gtk4
+, libadwaita
 , harfbuzz
 , libpng
 , libGL
@@ -59,6 +60,7 @@ let
     libXi
     libXrandr
 
+    libadwaita
     gtk4
     glib
   ];
@@ -120,6 +122,7 @@ in mkShell rec {
     libXrandr
 
     # Only needed for GTK builds
+    libadwaita
     gtk4
     glib
   ];
diff --git a/src/apprt/gtk/App.zig b/src/apprt/gtk/App.zig
index 47e69eba3..f5f93c38f 100644
--- a/src/apprt/gtk/App.zig
+++ b/src/apprt/gtk/App.zig
@@ -52,6 +52,9 @@ running: bool = true,
 pub fn init(core_app: *CoreApp, opts: Options) !App {
     _ = opts;
 
+    // Initialize libadwaita
+    c.adw_init();
+
     // Load our configuration
     var config = try Config.load(core_app.alloc);
     errdefer config.deinit();
@@ -63,6 +66,16 @@ pub fn init(core_app: *CoreApp, opts: Options) !App {
         }
     }
 
+    // Set the style based on our configuration file
+    c.adw_style_manager_set_color_scheme(
+        c.adw_style_manager_get_default(),
+        switch (config.@"window-theme") {
+            .system => c.ADW_COLOR_SCHEME_PREFER_LIGHT,
+            .dark => c.ADW_COLOR_SCHEME_FORCE_DARK,
+            .light => c.ADW_COLOR_SCHEME_FORCE_LIGHT,
+        },
+    );
+
     // The "none" cursor is used for hiding the cursor
     const cursor_none = c.gdk_cursor_new_from_name("none", null);
     errdefer if (cursor_none) |cursor| c.g_object_unref(cursor);
diff --git a/src/apprt/gtk/c.zig b/src/apprt/gtk/c.zig
index c5952d321..7eb19233f 100644
--- a/src/apprt/gtk/c.zig
+++ b/src/apprt/gtk/c.zig
@@ -1,5 +1,6 @@
 const c = @cImport({
     @cInclude("gtk/gtk.h");
+    @cInclude("libadwaita-1/adwaita.h");
 });
 
 pub usingnamespace c;
diff --git a/src/config/Config.zig b/src/config/Config.zig
index dc47fd5bd..7f2218ef0 100644
--- a/src/config/Config.zig
+++ b/src/config/Config.zig
@@ -378,7 +378,7 @@ keybind: Keybinds = .{},
 /// also be set to "light" or "dark" to force a specific theme regardless
 /// of the system settings.
 ///
-/// This is currently only supported on macOS.
+/// This is currently only supported on macOS and linux.
 @"window-theme": WindowTheme = .system,
 
 /// The initial window size. This size is in terminal grid cells by default.