feat: basic line graph component and cpu graph module

src/AGraph.cpp

@@ -0,0 +1,197 @@
+#include "AGraph.hpp"
+
+#include <cairomm/context.h>
+#include <fmt/format.h>
+
+#include <fstream>
+#include <iostream>
+#include <util/command.hpp>
+
+#include "config.hpp"
+
+namespace waybar {
+
+AGraph::AGraph(const Json::Value& config, const std::string& name, const std::string& id,
+               uint16_t interval, bool enable_click, bool enable_scroll)
+    : AModule(config, name, id,
+              config["format-alt"].isString() || config["menu"].isString() || enable_click,
+              enable_scroll),
+      interval_(config_["interval"] == "once"
+                    ? std::chrono::seconds::max()
+                    : std::chrono::seconds(
+                          config_["interval"].isUInt() ? config_["interval"].asUInt() : interval)) {
+  graph_.signal_draw().connect(sigc::mem_fun(*this, &AGraph::onDraw));
+  graph_.set_name(name);
+  if (!id.empty()) {
+    graph_.get_style_context()->add_class(id);
+  }
+  graph_.get_style_context()->add_class(MODULE_CLASS);
+  if (config_["width"].isUInt()) {
+    graph_.set_size_request(config_["width"].asUInt(), -1);
+  } else {
+    graph_.set_size_request(100, -1);
+  }
+
+  event_box_.add(graph_);
+
+  if (config_["datapoints"].isUInt()) {
+    datapoints_ = config_["datapoints_"].asUInt();
+  }
+
+  if (config_["y_offset"].isUInt()) {
+    y_offset_ = config_["y_offset"].asUInt();
+  }
+
+  // If a GTKMenu is requested in the config
+  if (config_["menu"].isString()) {
+    // Create the GTKMenu widget
+    try {
+      // Check that the file exists
+      std::string menuFile = config_["menu-file"].asString();
+
+      // there might be "~" or "$HOME" in original path, try to expand it.
+      auto result = Config::tryExpandPath(menuFile, "");
+      if (result.empty()) {
+        throw std::runtime_error("Failed to expand file: " + menuFile);
+      }
+
+      menuFile = result.front();
+      // Read the menu descriptor file
+      std::ifstream file(menuFile);
+      if (!file.is_open()) {
+        throw std::runtime_error("Failed to open file: " + menuFile);
+      }
+      std::stringstream fileContent;
+      fileContent << file.rdbuf();
+      GtkBuilder* builder = gtk_builder_new();
+
+      // Make the GtkBuilder and check for errors in his parsing
+      if (gtk_builder_add_from_string(builder, fileContent.str().c_str(), -1, nullptr) == 0U) {
+        throw std::runtime_error("Error found in the file " + menuFile);
+      }
+
+      menu_ = gtk_builder_get_object(builder, "menu");
+      if (menu_ == nullptr) {
+        throw std::runtime_error("Failed to get 'menu' object from GtkBuilder");
+      }
+      submenus_ = std::map<std::string, GtkMenuItem*>();
+      menuActionsMap_ = std::map<std::string, std::string>();
+
+      // Linking actions to the GTKMenu based on
+      for (Json::Value::const_iterator it = config_["menu-actions"].begin();
+           it != config_["menu-actions"].end(); ++it) {
+        std::string key = it.key().asString();
+        submenus_[key] = GTK_MENU_ITEM(gtk_builder_get_object(builder, key.c_str()));
+        menuActionsMap_[key] = it->asString();
+        g_signal_connect(submenus_[key], "activate", G_CALLBACK(handleGtkMenuEvent),
+                         (gpointer)menuActionsMap_[key].c_str());
+      }
+    } catch (std::runtime_error& e) {
+      spdlog::warn("Error while creating the menu : {}. Menu popup not activated.", e.what());
+    }
+  }
+}
+
+auto AGraph::update() -> void {
+  graph_.queue_draw();
+  AModule::update();
+}
+
+void AGraph::handleGtkMenuEvent(GtkMenuItem* /*menuitem*/, gpointer data) {
+  waybar::util::command::res res = waybar::util::command::exec((char*)data, "GtkMenu");
+}
+
+void AGraph::addValue(const int n) {
+  if (values_.size() >= datapoints_) {
+    values_.pop_front();
+  }
+  values_.push_back(n);
+}
+
+bool AGraph::onDraw(const Cairo::RefPtr<Cairo::Context>& cr) {
+  const int width = graph_.get_allocated_width();
+  const int height = graph_.get_allocated_height() - 1 - y_offset_;
+
+  if (values_.empty() || width <= 0 || height <= 0) {
+    return false;
+  }
+
+  auto style_context = graph_.get_style_context();
+  Gdk::RGBA fg_color = style_context->get_color(Gtk::STATE_FLAG_NORMAL);
+  Gdk::RGBA bg_color = fg_color;
+  bg_color.set_alpha(0.3);
+
+  cr->set_line_width(1.0);
+
+  const double step_width = static_cast<double>(width) / datapoints_;
+  const int values_count = values_.size();
+  const int empty_space = datapoints_ - values_count;
+
+  std::vector<std::pair<double, double>> points;
+  points.reserve(values_count);
+
+  for (int i = empty_space; i < datapoints_; ++i) {
+    double x = i * step_width;
+    int value_index = i - empty_space;
+    int value = values_[value_index];
+    double y = height - (static_cast<double>(value) / 100.0 * height);
+    points.emplace_back(x, y);
+  }
+
+  if (!points.empty()) {
+
+    drawFilledArea(cr, points, height, bg_color);
+
+    drawLine(cr, points, fg_color);
+  }
+
+  return false;
+}
+void AGraph::drawFilledArea(const Cairo::RefPtr<Cairo::Context>& cr,
+                            const std::vector<std::pair<double, double>>& points,
+                            double height, const Gdk::RGBA& bg_color) {
+  if (points.empty()) return;
+
+  double first_x = points.front().first;
+  double last_x = points.back().first;
+
+  drawPath(cr, points);
+
+  cr->line_to(last_x, height);
+  cr->line_to(first_x, height);
+  cr->close_path();
+
+  cr->set_source_rgba(bg_color.get_red(), bg_color.get_green(), bg_color.get_blue(),
+                      bg_color.get_alpha());
+  cr->fill();
+}
+
+void AGraph::drawLine(const Cairo::RefPtr<Cairo::Context>& cr,
+                      const std::vector<std::pair<double, double>>& points,
+                      const Gdk::RGBA& fg_color) {
+  if (points.empty()) return;
+
+  cr->begin_new_path();
+  drawPath(cr, points);
+
+  cr->set_source_rgba(fg_color.get_red(), fg_color.get_green(), fg_color.get_blue(),
+                      fg_color.get_alpha());
+  cr->stroke();
+}
+
+void AGraph::drawPath(const Cairo::RefPtr<Cairo::Context>& cr,
+                      const std::vector<std::pair<double, double>>& points) {
+  if (points.empty()) return;
+
+  bool first_point = true;
+  for (const auto& point : points) {
+    if (first_point) {
+      cr->move_to(point.first, point.second);
+      first_point = false;
+    } else {
+      cr->line_to(point.first, point.second);
+    }
+  }
+}
+
+}  // namespace waybar

src/factory.cpp

@@ -51,6 +51,7 @@
 #endif
 #if defined(HAVE_CPU_LINUX) || defined(HAVE_CPU_BSD)
 #include "modules/cpu.hpp"
+#include "modules/cpu_graph.hpp"
 #include "modules/cpu_frequency.hpp"
 #include "modules/cpu_usage.hpp"
 #include "modules/load.hpp"
@@ -251,6 +252,9 @@ waybar::AModule* waybar::Factory::makeModule(const std::string& name,
     if (ref == "cpu") {
       return new waybar::modules::Cpu(id, config_[name]);
     }
+    if (ref == "cpu_graph") {
+      return new waybar::modules::CpuGraph(id, config_[name]);
+    }
 #if defined(HAVE_CPU_LINUX)
     if (ref == "cpu_frequency") {
       return new waybar::modules::CpuFrequency(id, config_[name]);

src/modules/cpu_graph.cpp

@@ -0,0 +1,47 @@
+#include "modules/cpu_graph.hpp"
+
+#include "modules/cpu_frequency.hpp"
+#include "modules/cpu_usage.hpp"
+#include "modules/load.hpp"
+
+// In the 80000 version of fmt library authors decided to optimize imports
+// and moved declarations required for fmt::dynamic_format_arg_store in new
+// header fmt/args.h
+#if (FMT_VERSION >= 80000)
+#include <fmt/args.h>
+#else
+#include <fmt/core.h>
+#endif
+
+waybar::modules::CpuGraph::CpuGraph(const std::string& id, const Json::Value& config)
+    : AGraph(config, "cpu_graph", id, 5) {
+  thread_ = [this] {
+    dp.emit();
+    thread_.sleep_for(interval_);
+  };
+}
+
+auto waybar::modules::CpuGraph::update() -> void {
+  // TODO: as creating dynamic fmt::arg arrays is buggy we have to calc both
+  auto [cpu_usage, tooltip] = CpuUsage::getCpuUsage(prev_times_);
+  if (tooltipEnabled()) {
+    graph_.set_tooltip_text(tooltip);
+  }
+  auto total_usage = cpu_usage.empty() ? 0 : cpu_usage[0];
+  addValue(total_usage);
+
+  graph_.get_style_context()->remove_class(MODERATE_CLASS);
+  graph_.get_style_context()->remove_class(HIGH_CLASS);
+  graph_.get_style_context()->remove_class(INTENSIVE_CLASS);
+
+  if (total_usage > 90) {
+    graph_.get_style_context()->add_class(INTENSIVE_CLASS);
+  } else if (total_usage > 70) {
+    graph_.get_style_context()->add_class(HIGH_CLASS);
+  } else if (total_usage > 30) {
+    graph_.get_style_context()->add_class(MODERATE_CLASS);
+  }
+
+  // Call parent update
+  AGraph::update();
+}