Ladybird: Add --dump-layout-tree mode that dumps layout tree and exits

Ladybird/WebContentView.cpp

@@ -1055,3 +1055,8 @@ void WebContentView::notify_server_did_get_accessibility_tree(DeprecatedString c
 {
     dbgln("TODO: support accessibility tree in Ladybird");
 }
+
+ErrorOr<String> WebContentView::dump_layout_tree()
+{
+    return String::from_deprecated_string(client().dump_layout_tree());
+}

Ladybird/WebContentView.h

@@ -94,6 +94,8 @@ public:
     void show_js_console();
     void show_inspector();
 
+    ErrorOr<String> dump_layout_tree();
+
     Gfx::IntPoint to_content(Gfx::IntPoint) const;
     Gfx::IntPoint to_widget(Gfx::IntPoint) const;
 

Ladybird/main.cpp

@@ -7,6 +7,7 @@
 #include "BrowserWindow.h"
 #include "Settings.h"
 #include "Utilities.h"
+#include "WebContentView.h"
 #include <Browser/CookieJar.h>
 #include <Browser/Database.h>
 #include <LibCore/ArgsParser.h>
@@ -68,13 +69,32 @@ ErrorOr<int> serenity_main(Main::Arguments arguments)
 
     StringView raw_url;
     StringView webdriver_content_ipc_path;
+    bool dump_layout_tree;
 
     Core::ArgsParser args_parser;
     args_parser.set_general_help("The Ladybird web browser :^)");
     args_parser.add_positional_argument(raw_url, "URL to open", "url", Core::ArgsParser::Required::No);
     args_parser.add_option(webdriver_content_ipc_path, "Path to WebDriver IPC for WebContent", "webdriver-content-path", 0, "path");
+    args_parser.add_option(dump_layout_tree, "Dump layout tree and exit", "dump-layout-tree", 'd');
     args_parser.parse(arguments);
 
+    URL url = raw_url;
+    if (Core::File::exists(raw_url))
+        url = URL::create_with_file_scheme(Core::File::real_path_for(raw_url));
+    else if (!url.is_valid())
+        url = DeprecatedString::formatted("http://{}", raw_url);
+
+    if (dump_layout_tree) {
+        WebContentView view({});
+        view.on_load_finish = [&](auto&) {
+            auto dump = view.dump_layout_tree().release_value_but_fixme_should_propagate_errors();
+            outln("{}", dump);
+            _exit(0);
+        };
+        view.load(url);
+        return app.exec();
+    }
+
     auto cookie_jar = TRY(Browser::CookieJar::create(*database));
 
     BrowserWindow window(cookie_jar, webdriver_content_ipc_path);
@@ -83,12 +103,6 @@ ErrorOr<int> serenity_main(Main::Arguments arguments)
     window.resize(800, 600);
     window.show();
 
-    URL url = raw_url;
-    if (Core::File::exists(raw_url))
-        url = URL::create_with_file_scheme(Core::File::real_path_for(raw_url));
-    else if (!url.is_valid())
-        url = DeprecatedString::formatted("http://{}", raw_url);
-
     if (url.is_valid())
         window.view().load(url);