Browser: Add help menu item

Contributes towards: #21091

Userland/Applications/Browser/BrowserWindow.cpp

@@ -16,6 +16,7 @@
 #include <Applications/BrowserSettings/Defaults.h>
 #include <LibConfig/Client.h>
 #include <LibCore/StandardPaths.h>
+#include <LibDesktop/Launcher.h>
 #include <LibGUI/Application.h>
 #include <LibGUI/Clipboard.h>
 #include <LibGUI/Icon.h>
@@ -49,7 +50,7 @@ static ByteString bookmarks_file_path()
     return builder.to_byte_string();
 }
 
-BrowserWindow::BrowserWindow(WebView::CookieJar& cookie_jar, Vector<URL> const& initial_urls)
+BrowserWindow::BrowserWindow(WebView::CookieJar& cookie_jar, Vector<URL> const& initial_urls, StringView const man_file)
     : m_cookie_jar(cookie_jar)
     , m_window_actions(*this)
 {
@@ -138,13 +139,13 @@ BrowserWindow::BrowserWindow(WebView::CookieJar& cookie_jar, Vector<URL> const&
     m_window_actions.vertical_tabs_action().set_checked(vertical_tabs);
     m_tab_widget->set_tab_position(vertical_tabs ? TabPosition::Left : TabPosition::Top);
 
-    build_menus();
+    build_menus(man_file);
 
     for (size_t i = 0; i < initial_urls.size(); ++i)
         create_new_tab(initial_urls[i], (i == 0) ? Web::HTML::ActivateTab::Yes : Web::HTML::ActivateTab::No);
 }
 
-void BrowserWindow::build_menus()
+void BrowserWindow::build_menus(StringView const man_file)
 {
     auto file_menu = add_menu("&File"_string);
     file_menu->add_action(WindowActions::the().create_new_tab_action());
@@ -445,6 +446,9 @@ void BrowserWindow::build_menus()
 
     auto help_menu = add_menu("&Help"_string);
     help_menu->add_action(GUI::CommonActions::make_command_palette_action(this));
+    help_menu->add_action(GUI::CommonActions::make_help_action([man_file](auto&) {
+        Desktop::Launcher::open(URL::create_with_file_scheme(man_file), "/bin/Help");
+    }));
     help_menu->add_action(WindowActions::the().about_action());
 }
 

Userland/Applications/Browser/BrowserWindow.h

@@ -51,9 +51,9 @@ public:
     void broadcast_window_size(Gfx::IntSize);
 
 private:
-    BrowserWindow(WebView::CookieJar&, Vector<URL> const&);
+    BrowserWindow(WebView::CookieJar&, Vector<URL> const&, StringView const);
 
-    void build_menus();
+    void build_menus(StringView const);
     ErrorOr<void> load_search_engines(GUI::Menu& settings_menu);
     void set_window_title_for_tab(Tab const&);
 

Userland/Applications/Browser/main.cpp

@@ -105,6 +105,7 @@ ErrorOr<int> serenity_main(Main::Arguments arguments)
     args_parser.parse(arguments);
 
     auto app = TRY(GUI::Application::create(arguments));
+    auto const man_file = "/usr/share/man/man1/Applications/Browser.md"sv;
 
     Config::pledge_domain("Browser");
     Config::monitor_domain("Browser");
@@ -113,6 +114,7 @@ ErrorOr<int> serenity_main(Main::Arguments arguments)
     // the user's downloads directory.
     // FIXME: This should go away with a standalone download manager at some point.
     TRY(Desktop::Launcher::add_allowed_url(URL::create_with_file_scheme(Core::StandardPaths::downloads_directory())));
+    TRY(Desktop::Launcher::add_allowed_handler_with_only_specific_urls("/bin/Help", { URL::create_with_file_scheme(man_file) }));
     TRY(Desktop::Launcher::seal_allowlist());
 
     TRY(Core::System::unveil("/tmp/session/%sid/portal/filesystemaccess", "rw"));
@@ -171,7 +173,7 @@ ErrorOr<int> serenity_main(Main::Arguments arguments)
         initial_urls.append(Browser::g_home_url);
 
     auto cookie_jar = TRY(WebView::CookieJar::create(*database));
-    auto window = Browser::BrowserWindow::construct(cookie_jar, initial_urls);
+    auto window = Browser::BrowserWindow::construct(cookie_jar, initial_urls, man_file);
 
     auto content_filters_watcher = TRY(Core::FileWatcher::create());
     content_filters_watcher->on_change = [&](Core::FileWatcherEvent const&) {