Profiler: If run without arguments, let user select process from a list

We now show a list of running processes that the user can choose from.
After choosing one, we start profiling it and show a timer with a stop
button that the user has to press to stop profiling.

1 files changed, 107 insertions, 5 deletions

diff --git a/DevTools/Profiler/main.cpp b/DevTools/Profiler/main.cpp
index dc64030101..480d0116e0 100644
--- a/DevTools/Profiler/main.cpp
+++ b/DevTools/Profiler/main.cpp
@@ -26,26 +26,46 @@
 
 #include "Profile.h"
 #include "ProfileTimelineWidget.h"
+#include "RunningProcessesModel.h"
+#include <LibCore/ElapsedTimer.h>
+#include <LibCore/EventLoop.h>
+#include <LibCore/Timer.h>
 #include <LibGUI/Action.h>
 #include <LibGUI/Application.h>
 #include <LibGUI/BoxLayout.h>
+#include <LibGUI/Button.h>
+#include <LibGUI/Desktop.h>
+#include <LibGUI/Label.h>
 #include <LibGUI/Menu.h>
 #include <LibGUI/MenuBar.h>
+#include <LibGUI/MessageBox.h>
 #include <LibGUI/Model.h>
+#include <LibGUI/SortingProxyModel.h>
 #include <LibGUI/Splitter.h>
 #include <LibGUI/TableView.h>
 #include <LibGUI/TreeView.h>
 #include <LibGUI/Window.h>
+#include <serenity.h>
 #include <stdio.h>
+#include <string.h>
+
+static bool generate_profile();
 
 int main(int argc, char** argv)
 {
+    GUI::Application app(argc, argv);
+
+    const char* path = nullptr;
     if (argc != 2) {
-        printf("usage: %s <profile-file>\n", argv[0]);
-        return 0;
+        if (!generate_profile())
+            return 0;
+        path = "/proc/profile";
+    } else {
+        path = argv[1];
     }
 
-    const char* path = argv[1];
+    printf("We're here!\n");
+
     auto profile = Profile::load_from_perfcore_file(path);
 
     if (!profile) {
@@ -53,8 +73,6 @@ int main(int argc, char** argv)
         return 1;
     }
 
-    GUI::Application app(argc, argv);
-
     auto window = GUI::Window::construct();
     window->set_title("Profiler");
     window->set_rect(100, 100, 800, 600);
@@ -102,3 +120,87 @@ int main(int argc, char** argv)
     window->show();
     return app.exec();
 }
+
+bool prompt_for_process_to_profile()
+{
+    bool success = false;
+    auto window = GUI::Window::construct();
+    window->set_title("Profiler");
+    Gfx::IntRect window_rect { 0, 0, 480, 360 };
+    window_rect.center_within(GUI::Desktop::the().rect());
+    window->set_rect(window_rect);
+    auto& widget = window->set_main_widget<GUI::Widget>();
+    widget.set_fill_with_background_color(true);
+    widget.set_layout<GUI::VerticalBoxLayout>();
+    auto& table_view = widget.add<GUI::TableView>();
+    table_view.set_model(GUI::SortingProxyModel::create(Profiler::RunningProcessesModel::create()));
+    table_view.model()->set_key_column_and_sort_order(Profiler::RunningProcessesModel::Column::PID, GUI::SortOrder::Descending);
+    auto& button_container = widget.add<GUI::Widget>();
+    button_container.set_preferred_size(0, 30);
+    button_container.set_size_policy(GUI::SizePolicy::Fill, GUI::SizePolicy::Fixed);
+    button_container.set_layout<GUI::HorizontalBoxLayout>();
+    auto& profile_button = button_container.add<GUI::Button>("Profile");
+    profile_button.on_click = [&](auto) {
+        if (table_view.selection().is_empty()) {
+            GUI::MessageBox::show("No process selected!", "Profiler", GUI::MessageBox::Type::Error, GUI::MessageBox::InputType::OK, window);
+            return;
+        }
+        auto index = table_view.selection().first();
+        auto pid_as_variant = table_view.model()->data(index, GUI::Model::Role::Custom);
+        auto pid = pid_as_variant.as_i32();
+        if (profiling_enable(pid) < 0) {
+            int saved_errno = errno;
+            GUI::MessageBox::show(String::format("Unable to profile PID %d: %s", pid, strerror(saved_errno)), "Profiler", GUI::MessageBox::Type::Error, GUI::MessageBox::InputType::OK, window);
+            return;
+        }
+
+        success = true;
+        GUI::Application::the().quit(0);
+    };
+    auto& cancel_button = button_container.add<GUI::Button>("Cancel");
+    cancel_button.on_click = [](auto) {
+        GUI::Application::the().quit(1);
+    };
+
+    table_view.model()->update();
+    window->show();
+    return GUI::Application::the().exec() == 0;
+}
+
+bool prompt_to_stop_profiling()
+{
+    auto window = GUI::Window::construct();
+    window->set_title("Profiling");
+    Gfx::IntRect window_rect { 0, 0, 320, 200 };
+    window_rect.center_within(GUI::Desktop::the().rect());
+    window->set_rect(window_rect);
+    auto& widget = window->set_main_widget<GUI::Widget>();
+    widget.set_fill_with_background_color(true);
+    widget.set_layout<GUI::VerticalBoxLayout>();
+
+    auto& timer_label = widget.add<GUI::Label>("...");
+    Core::ElapsedTimer clock;
+    clock.start();
+    auto update_timer = Core::Timer::construct(100, [&] {
+        timer_label.set_text(String::format("%.1f seconds", (float)clock.elapsed() / 1000.0f));
+    });
+
+    auto& stop_button = widget.add<GUI::Button>("Stop");
+    stop_button.on_click = [&](auto) {
+        GUI::Application::the().quit();
+    };
+
+    window->show();
+    return GUI::Application::the().exec() == 0;
+}
+
+bool generate_profile()
+{
+    if (!prompt_for_process_to_profile())
+        return false;
+
+    if (!prompt_to_stop_profiling())
+        return false;
+
+    return true;
+}