refactor: simpler memory code

include/modules/memory.hpp

@@ -12,6 +12,7 @@ class Memory : public ALabel {
     Memory(const Json::Value&);
     auto update() -> void;
   private:
+    static inline const std::string data_dir_ = "/proc/meminfo";
     unsigned long memtotal_;
     unsigned long memfree_;
     void parseMeminfo();

src/modules/memory.cpp

@@ -3,7 +3,6 @@
 waybar::modules::Memory::Memory(const Json::Value& config)
   : ALabel(config, "{}%")
 {
-  label_.set_name("memory");
   uint32_t interval = config_["interval"].isUInt() ? config_["interval"].asUInt() : 30;
   thread_ = [this, interval] {
     dp.emit();
@@ -19,51 +18,45 @@ auto waybar::modules::Memory::update() -> void
     label_.set_text(fmt::format(format_, used_ram_percentage));
     auto used_ram_gigabytes = (memtotal_ - memfree_) / std::pow(1024, 2);
     label_.set_tooltip_text(fmt::format("{:.{}f}Gb used", used_ram_gigabytes, 1));
+    label_.set_name("memory");
     label_.show();
   } else {
+    label_.set_name("");
     label_.hide();
   }
 }
 
 void waybar::modules::Memory::parseMeminfo()
 {
-  long memtotal = -1, memfree = -1, membuffer = -1, memcache = -1, memavail = -1;
-  int count = 0;
+  long memfree = -1, membuffer = -1, memcache = -1, memavail = -1;
+  std::ifstream info(data_dir_);
+  if (!info.is_open()) {
+    throw std::runtime_error("Can't open " + data_dir_);
+  }
   std::string line;
-  std::ifstream info("/proc/meminfo");
-  if(info.is_open()) {
   while (getline(info, line)) {
     auto posDelim = line.find(":");
+    if (posDelim == std::string::npos) {
+      continue;
+    }
     std::string name = line.substr(0, posDelim);
     long value = std::stol(line.substr(posDelim + 1));
 
     if (name.compare("MemTotal") == 0) {
-        memtotal = value;
-        count++;
+      memtotal_ = value;
     } else if (name.compare("MemAvailable") == 0) {
       memavail = value;
-        count++;
     } else if (name.compare("MemFree") == 0) {
       memfree = value;
-        count++;
     } else if (name.compare("Buffers") == 0) {
       membuffer = value;
-        count++;
     } else if (name.compare("Cached") == 0) {
       memcache = value;
-        count++;
     }
-      if (count >= 5 || (count >= 4 && memavail >= -1)) {
-        info.close();
+    if (memtotal_ > 0 &&
+      (memavail >= 0 || (memfree > -1  && membuffer > -1 && memcache > -1))) {
+      break;
     }
   }
-  } else {
-    throw std::runtime_error("Can't open /proc/meminfo");
-  }
-  memtotal_ = memtotal;
-  if(memavail >= 0) {
-    memfree_ = memavail;
-  } else {
-    memfree_ = memfree + (membuffer + memcache);
-  }
+  memfree_ = memavail >= 0 ? memavail : memfree + membuffer + memcache;
 }