LibCore+Userland: Make Core::Timer::create_repeating() return ErrorOr

The FIXMEs must flow!

Userland/Applications/ClockSettings/ClockSettingsWidget.cpp

@@ -89,7 +89,7 @@ ClockSettingsWidget::ClockSettingsWidget()
 
     m_clock_preview_update_timer = Core::Timer::create_repeating(1000, [&]() {
         update_clock_preview();
-    });
+    }).release_value_but_fixme_should_propagate_errors();
     m_clock_preview_update_timer->start();
     update_clock_preview();
 }

Userland/Applications/DisplaySettings/MonitorSettingsWidget.cpp

@@ -250,7 +250,7 @@ void MonitorSettingsWidget::apply_settings()
                 if (seconds_until_revert <= 0) {
                     box->close();
                 }
-            });
+            }).release_value_but_fixme_should_propagate_errors();
             revert_timer->start();
 
             // If the user selects "No", closes the window or the window gets closed by the 10 seconds timer, revert the changes.

Userland/Applications/MouseSettings/HighlightPreviewWidget.cpp

@@ -37,10 +37,10 @@ ErrorOr<void> HighlightPreviewWidget::reload_cursor()
     m_cursor_params = Gfx::CursorParams::parse_from_filename(cursor_path, m_cursor_bitmap->rect().center()).constrained(*m_cursor_bitmap);
     // Setup cursor animation:
     if (m_cursor_params.frames() > 1 && m_cursor_params.frame_ms() > 0) {
-        m_frame_timer = Core::Timer::create_repeating(m_cursor_params.frame_ms(), [&] {
+        m_frame_timer = TRY(Core::Timer::create_repeating(m_cursor_params.frame_ms(), [&] {
             m_cursor_frame = (m_cursor_frame + 1) % m_cursor_params.frames();
             update();
-        });
+        }));
         m_frame_timer->start();
     } else {
         m_frame_timer = nullptr;

Userland/Applications/PixelPaint/ImageEditor.cpp

@@ -51,7 +51,7 @@ ImageEditor::ImageEditor(NonnullRefPtr<Image> image)
         m_marching_ants_offset %= (marching_ant_length * 2);
         if (!m_image->selection().is_empty() || m_image->selection().in_interactive_selection())
             update();
-    });
+    }).release_value_but_fixme_should_propagate_errors();
     m_marching_ants_timer->start();
 }
 

Userland/Applications/Terminal/main.cpp

@@ -453,9 +453,9 @@ ErrorOr<int> serenity_main(Main::Arguments arguments)
     TRY(Core::System::unveil("/tmp/session/%sid/portal/config", "rw"));
     TRY(Core::System::unveil(nullptr, nullptr));
 
-    auto modified_state_check_timer = Core::Timer::create_repeating(500, [&] {
+    auto modified_state_check_timer = TRY(Core::Timer::create_repeating(500, [&] {
         window->set_modified(tty_has_foreground_process() || shell_child_process_count() > 0);
-    });
+    }));
 
     listener.on_confirm_close_changed = [&](bool confirm_close) {
         if (confirm_close) {

Userland/DevTools/HackStudio/Editor.cpp

@@ -786,7 +786,7 @@ void Editor::create_tokens_info_timer()
     m_tokens_info_timer = Core::Timer::create_repeating((int)token_info_timer_interval_ms, [this] {
         on_token_info_timer_tick();
         m_tokens_info_timer->stop();
-    });
+    }).release_value_but_fixme_should_propagate_errors();
     m_tokens_info_timer->start();
 }
 

Userland/Games/Minesweeper/Field.cpp

@@ -140,7 +140,8 @@ void Field::initialize()
             ++m_time_elapsed;
             m_time_label.set_text(human_readable_digital_time(m_time_elapsed));
         },
-        this);
+        this)
+                  .release_value_but_fixme_should_propagate_errors();
 
     // Square with mine will be filled with background color later, i.e. red
     m_mine_palette.set_color(Gfx::ColorRole::Base, Color::from_rgb(0xff4040));

Userland/Games/Solitaire/main.cpp

@@ -111,7 +111,7 @@ ErrorOr<int> serenity_main(Main::Arguments arguments)
 
     uint64_t seconds_elapsed = 0;
 
-    auto timer = Core::Timer::create_repeating(1000, [&]() {
+    auto timer = TRY(Core::Timer::create_repeating(1000, [&]() {
         ++seconds_elapsed;
 
         uint64_t hours = seconds_elapsed / 3600;
@@ -119,7 +119,7 @@ ErrorOr<int> serenity_main(Main::Arguments arguments)
         uint64_t seconds = seconds_elapsed % 60;
 
         statusbar.set_text(2, DeprecatedString::formatted("Time: {:02}:{:02}:{:02}", hours, minutes, seconds));
-    });
+    }));
 
     game.on_game_start = [&]() {
         seconds_elapsed = 0;

Userland/Games/Spider/main.cpp

@@ -158,11 +158,11 @@ ErrorOr<int> serenity_main(Main::Arguments arguments)
 
     uint64_t seconds_elapsed = 0;
 
-    auto timer = Core::Timer::create_repeating(1000, [&]() {
+    auto timer = TRY(Core::Timer::create_repeating(1000, [&]() {
         ++seconds_elapsed;
 
         statusbar.set_text(2, DeprecatedString::formatted("Time: {}", format_seconds(seconds_elapsed)));
-    });
+    }));
 
     game.on_game_start = [&]() {
         seconds_elapsed = 0;

Userland/Libraries/LibCore/Timer.h

@@ -16,9 +16,9 @@ class Timer final : public Object {
     C_OBJECT(Timer);
 
 public:
-    static NonnullRefPtr<Timer> create_repeating(int interval_ms, Function<void()>&& timeout_handler, Object* parent = nullptr)
+    static ErrorOr<NonnullRefPtr<Timer>> create_repeating(int interval_ms, Function<void()>&& timeout_handler, Object* parent = nullptr)
     {
-        auto timer = adopt_ref(*new Timer(interval_ms, move(timeout_handler), parent));
+        auto timer = TRY(adopt_nonnull_ref_or_enomem(new Timer(interval_ms, move(timeout_handler), parent)));
         timer->stop();
         return timer;
     }

Userland/Services/DHCPClient/DHCPv4Client.cpp

@@ -139,7 +139,8 @@ DHCPv4Client::DHCPv4Client(Vector<DeprecatedString> interfaces_with_dhcp_enabled
     }
 
     m_check_timer = Core::Timer::create_repeating(
-        1000, [this] { try_discover_ifs(); }, this);
+        1000, [this] { try_discover_ifs(); }, this)
+                        .release_value_but_fixme_should_propagate_errors();
 
     m_check_timer->start();
 

Userland/Services/WindowServer/Menu.cpp

@@ -537,7 +537,7 @@ void Menu::start_activation_animation(MenuItem& item)
 
         float opacity = (float)animation->step / 10.0f;
         animation->window->set_opacity(opacity);
-    });
+    }).release_value_but_fixme_should_propagate_errors();
     timer->start();
 }