From e93a6eb2e4497804157c7cb6a345223ac4de8878 Mon Sep 17 00:00:00 2001
From: Mitchell Hashimoto <mitchell.hashimoto@gmail.com>
Date: Tue, 8 Aug 2023 09:43:15 -0700
Subject: [PATCH] apprt/gtk: set icon name

---
 src/apprt/gtk.zig | 29 +++++++++++++++++++++++++++++
 1 file changed, 29 insertions(+)

diff --git a/src/apprt/gtk.zig b/src/apprt/gtk.zig
index 8c671be4f..bbdbccd43 100644
--- a/src/apprt/gtk.zig
+++ b/src/apprt/gtk.zig
@@ -298,6 +298,9 @@ const Window = struct {
     /// The background CSS for the window (if any).
     css_window_background: ?[]u8 = null,
 
+    /// The resources directory for the icon (if any).
+    icon_search_dir: ?[:0]const u8 = null,
+
     pub fn init(self: *Window, app: *App) !void {
         // Set up our own state
         self.* = .{
@@ -314,6 +317,31 @@ const Window = struct {
         c.gtk_window_set_title(gtk_window, "Ghostty");
         c.gtk_window_set_default_size(gtk_window, 1000, 600);
 
+        // If we don't have the icon then we'll try to add our resources dir
+        // to the search path and see if we can find it there.
+        const icon_name = "com.mitchellh.ghostty";
+        const icon_theme = c.gtk_icon_theme_get_for_display(c.gtk_widget_get_display(window));
+        if (c.gtk_icon_theme_has_icon(icon_theme, icon_name) == 0) icon: {
+            const base = self.app.core_app.resources_dir orelse {
+                log.info("gtk app missing Ghostty icon and no resources dir detected", .{});
+                log.info("gtk app will not have Ghostty icon", .{});
+                break :icon;
+            };
+
+            // Note that this method for adding the icon search path is
+            // a fallback mechanism. The recommended mechanism is the
+            // Freedesktop Icon Theme Specification. We distribute a ".desktop"
+            // file in zig-out/share that should be installed to the proper
+            // place.
+            const dir = try std.fmt.allocPrintZ(app.core_app.alloc, "{s}/icons", .{base});
+            self.icon_search_dir = dir;
+            c.gtk_icon_theme_add_search_path(icon_theme, dir.ptr);
+            if (c.gtk_icon_theme_has_icon(icon_theme, icon_name) == 0) {
+                log.warn("Ghostty icon for gtk app not found", .{});
+            }
+        }
+        c.gtk_window_set_icon_name(gtk_window, icon_name);
+
         // Apply background opacity if we have it
         if (app.config.@"background-opacity" < 1) {
             var css = try std.fmt.allocPrint(
@@ -361,6 +389,7 @@ const Window = struct {
 
     pub fn deinit(self: *Window) void {
         if (self.css_window_background) |ptr| self.app.core_app.alloc.free(ptr);
+        if (self.icon_search_dir) |ptr| self.app.core_app.alloc.free(ptr);
     }
 
     /// Add a new tab to this window.