Improving mouse buttons support

Adding support for middle, backward, and forward mouse buttons click events, adds config keys : "on-click-middle", "on-click-forward" and "on-click-backward"
Adding the key "format-alt-click" to choose what mouse clicks toggles the alternative format, when present. Possible values (in config): "click-right", "click-left", "click-middle", "click-forward", "click-backward". Other values have the same effect than "click-left". Previous behaviour was to toggle it whenever any click was registered and any click that was not handled by "on-click-right" or "on-click-left" occurred

src/ALabel.cpp

@@ -40,11 +40,19 @@ auto waybar::ALabel::update() -> void {
 bool waybar::ALabel::handleToggle(GdkEventButton* const& e) {
   if (config_["on-click"].isString() && e->button == 1) {
     waybar::util::command::forkExec(config_["on-click"].asString());
+  } else if (config_["on-click-middle"].isString() && e->button == 2) {
+    waybar::util::command::forkExec(config_["on-click-middle"].asString());
   } else if (config_["on-click-right"].isString() && e->button == 3) {
     waybar::util::command::forkExec(config_["on-click-right"].asString());
-  } else {
+  } else if (config_["on-click-forward"].isString() && e->button == 8) {
+    waybar::util::command::forkExec(config_["on-click-backward"].asString());
+  } else if (config_["on-click-backward"].isString() && e->button == 9) {
+    waybar::util::command::forkExec(config_["on-click-forward"].asString());
+
+
+  } else if (config_["format-alt-click"].isUInt() && e->button == config_["format-alt-click"].asUInt()) {
     alt_ = !alt_;
-    if (alt_) {
+    if (alt_ && config_["format-alt"].isString()) {
       format_ = config_["format-alt"].asString();
     } else {
       format_ = default_format_;

src/bar.cpp

@@ -196,6 +196,54 @@ auto waybar::Bar::setupConfig() -> void
     std::istreambuf_iterator<char>());
   util::JsonParser parser;
   config_ = parser.parse(str);
+
+  // Converting string to button code rn as to avoid doing it later
+  auto setupAltFormatKeyForModule = [this](const std::string& module_name){
+  	if (config_.isMember(module_name)) {
+      Json::Value& module = config_[module_name];
+      if (module.isMember("format-alt")) {
+        if (module.isMember("format-alt-click")) {
+          Json::Value& click = module["format-alt-click"];
+          if (click.isString()) {
+	        std::string str_click = click.asString();
+
+	        if (str_click == "click-right") {
+		      module["format-alt-click"] = 3u;
+	        } else if (str_click == "click-middle") {
+		      module["format-alt-click"] = 2u;
+	        } else if (str_click == "click-backward") {
+		      module["format-alt-click"] = 8u;
+	        } else if (str_click == "click-forward") {
+		      module["format-alt-click"] = 9u;
+	        } else {
+		      module["format-alt-click"] = 1u; // default click-left
+	        }
+          } else {
+            module["format-alt-click"] = 1u;
+          }
+        } else {
+	      module["format-alt-click"] = 1u;
+        }
+
+      }
+    }
+  };
+
+  auto setupAltFormatKeyForModuleList = [this, &setupAltFormatKeyForModule](const char* module_list_name) {
+  	if (config_.isMember(module_list_name)) {
+  		Json::Value& modules = config_[module_list_name];
+	    for (const Json::Value& module_name : modules) {
+		    if (module_name.isString()) {
+			    setupAltFormatKeyForModule(module_name.asString());
+		    }
+	    }
+  	}
+  };
+
+  // Convert to button code for every module that is used.
+  setupAltFormatKeyForModuleList("modules-left");
+  setupAltFormatKeyForModuleList("modules-right");
+  setupAltFormatKeyForModuleList("modules-center");
 }
 
 auto waybar::Bar::setupCss() -> void