feat(Custom): handle continuous script

include/modules/custom.hpp

@@ -13,7 +13,8 @@ class Custom : public ALabel {
     Custom(const std::string, const Json::Value&);
     auto update() -> void;
   private:
-    void worker();
+    void delayWorker();
+    void continuousWorker();
 
     const std::string name_;
     waybar::util::SleeperThread thread_;

include/util/chrono.hpp

@@ -70,7 +70,7 @@ struct SleeperThread {
     condvar_.notify_all();
   }
 
-  ~SleeperThread()
+  auto stop()
   {
     do_run_ = false;
     condvar_.notify_all();
@@ -79,6 +79,11 @@ struct SleeperThread {
     }
   }
 
+  ~SleeperThread()
+  {
+    stop();
+  }
+
 private:
   std::thread thread_;
   std::condition_variable condvar_;

resources/config

@@ -62,6 +62,7 @@
     "custom/spotify": {
         "format": " {}",
         "max-length": 40,
+        "interval": 30, // Remove this if your script is endless and write in loop
         "exec": "$HOME/.config/waybar/mediaplayer.sh", // Script in resources folder
         "exec-if": "pgrep spotify"
     }

src/modules/custom.cpp

@@ -7,12 +7,16 @@ waybar::modules::Custom::Custom(const std::string name,
   if (!config_["exec"]) {
     throw std::runtime_error(name_ + " has no exec path.");
   }
-  worker();
+  if (config_["interval"]) {
+    delayWorker();
+  } else {
+    continuousWorker();
+  }
 }
 
-void waybar::modules::Custom::worker()
+void waybar::modules::Custom::delayWorker()
 {
-  uint32_t interval = config_["interval"] ? config_["inveral"].asUInt() : 30;
+  auto interval = config_["interval"].asUInt();
   thread_ = [this, interval] {
     bool can_update = true;
     if (config_["exec-if"]) {
@@ -31,6 +35,34 @@ void waybar::modules::Custom::worker()
   };
 }
 
+void waybar::modules::Custom::continuousWorker()
+{
+  auto cmd = config_["exec"].asString();
+  FILE* fp(popen(cmd.c_str(), "r"));
+  if (!fp) {
+    throw std::runtime_error("Unable to open " + cmd);
+  }
+  thread_ = [this, fp] {
+    char* buff = nullptr;
+    size_t len = 0;
+    if (getline(&buff, &len, fp) == -1) {
+      thread_.stop();
+      output_ = { 1, "" };
+      dp.emit();
+      return;
+    }
+
+    std::string output = buff;
+
+    // Remove last newline
+    if (!output.empty() && output[output.length()-1] == '\n') {
+      output.erase(output.length()-1);
+    }
+    output_ = { 0, output };
+    dp.emit();
+  };
+}
+
 auto waybar::modules::Custom::update() -> void
 {
   // Hide label if output is empty