Move cpu usage from screen setup to tmux setup.

tmux-mem-cpu-load.cpp

@@ -1,10 +1,4 @@
-/** 
- * @file cpuusage.cpp
- * @brief print out the percent cpu usage at a given interval
- * @author Matthew McCormick (thewtex)
- * @version 
- * @date 2009-08-12
- */
+
 #include <fstream>
 #include <iostream>
 #include <sstream>
@@ -13,125 +7,96 @@ using namespace std;
 
 #include <unistd.h> // sleep
 
-// in seconds
-const static unsigned int INTERVAL=1;
-
-class CPUPercentage
+float cpu_percentage()
 {
-public:
-  CPUPercentage();
-  ~CPUPercentage();
+  string stat_line;
+  size_t line_start_pos;
+  size_t line_end_pos;
+  unsigned long long current_user;
+  unsigned long long current_system;
+  unsigned long long current_nice;
+  unsigned long long current_idle;
+  unsigned long long next_user;
+  unsigned long long next_system;
+  unsigned long long next_nice;
+  unsigned long long next_idle;
+  unsigned long long diff_user;
+  unsigned long long diff_system;
+  unsigned long long diff_nice;
+  unsigned long long diff_idle;
 
-  const float& get_percentage();
-
-private:
-  ifstream m_stat_file;
-  unsigned long long m_current_user;
-  unsigned long long m_current_system;
-  unsigned long long m_current_nice;
-  unsigned long long m_current_idle;
-  unsigned long long m_next_user;
-  unsigned long long m_next_system;
-  unsigned long long m_next_nice;
-  unsigned long long m_next_idle;
-  unsigned long long m_diff_user;
-  unsigned long long m_diff_system;
-  unsigned long long m_diff_nice;
-  unsigned long long m_diff_idle;
-
-  string m_stat_line;
-  size_t m_line_start_pos;
-  size_t m_line_end_pos;
-  istringstream m_iss;
-
-  float m_percentage;
-};
-
-CPUPercentage::CPUPercentage():
-  m_current_user(0),
-  m_current_system(0),
-  m_current_nice(0),
-  m_current_idle(0),
-  m_next_user(0),
-  m_next_system(0),
-  m_next_nice(0),
-  m_next_idle(0),
-  m_diff_user(0),
-  m_diff_system(0),
-  m_diff_nice(0),
-  m_diff_idle(0)
-{
-  m_stat_file.exceptions(ifstream::eofbit|ifstream::failbit|ifstream::badbit);
-}
-
-CPUPercentage::~CPUPercentage()
-{
-  if(m_stat_file.is_open())
-    m_stat_file.close();
-}
-
-const float& CPUPercentage::get_percentage()
-{
-  m_stat_file.open("/proc/stat");
-  getline(m_stat_file, m_stat_line);
-  m_stat_file.close();
+  ifstream stat_file("/proc/stat");
+  getline(stat_file, stat_line);
+  stat_file.close();
 
   // skip "cpu"
-  m_line_start_pos = m_stat_line.find_first_not_of(" ", 3);
-  m_line_end_pos = m_stat_line.find_first_of(' ', m_line_start_pos);
-  m_line_end_pos = m_stat_line.find_first_of(' ', m_line_end_pos + 1);
-  m_line_end_pos = m_stat_line.find_first_of(' ', m_line_end_pos + 1);
-  m_line_end_pos = m_stat_line.find_first_of(' ', m_line_end_pos + 1);
-  m_iss.str(m_stat_line.substr(m_line_start_pos, m_line_end_pos - m_line_start_pos));
-  m_iss >> m_next_user >> m_next_nice >> m_next_system >> m_next_idle;
-  m_iss.clear();
+  line_start_pos = stat_line.find_first_not_of(" ", 3);
+  line_end_pos = stat_line.find_first_of(' ', line_start_pos);
+  line_end_pos = stat_line.find_first_of(' ', line_end_pos + 1);
+  line_end_pos = stat_line.find_first_of(' ', line_end_pos + 1);
+  line_end_pos = stat_line.find_first_of(' ', line_end_pos + 1);
 
-  m_diff_user   = m_next_user - m_current_user;
-  m_diff_system = m_next_system - m_current_system;
-  m_diff_nice   = m_next_nice - m_current_nice;
-  m_diff_idle   = m_next_idle - m_current_idle;
-  m_percentage = static_cast<float>(m_diff_user + m_diff_system + m_diff_nice)/static_cast<float>(m_diff_user + m_diff_system + m_diff_nice + m_diff_idle)*100.0;
+  istringstream iss;
+  iss.str( stat_line.substr( line_start_pos, line_end_pos - line_start_pos ) );
+  iss >> current_user >> current_nice >> current_system >> current_idle;
+  iss.clear();
 
-  m_current_user = m_next_user;
-  m_current_system = m_next_system;
-  m_current_nice = m_next_nice;
-  m_current_idle = m_next_idle;
+  sleep(1);
 
-  return m_percentage;
+  stat_file.open("/proc/stat");
+  getline(stat_file, stat_line);
+  stat_file.close();
+
+  // skip "cpu"
+  line_start_pos = stat_line.find_first_not_of(" ", 3);
+  line_end_pos = stat_line.find_first_of(' ', line_start_pos);
+  line_end_pos = stat_line.find_first_of(' ', line_end_pos + 1);
+  line_end_pos = stat_line.find_first_of(' ', line_end_pos + 1);
+  line_end_pos = stat_line.find_first_of(' ', line_end_pos + 1);
+
+  iss.str( stat_line.substr( line_start_pos, line_end_pos - line_start_pos ) );
+  iss >> next_user >> next_nice >> next_system >> next_idle;
+  iss.clear();
+
+  diff_user   = next_user - current_user;
+  diff_system = next_system - current_system;
+  diff_nice   = next_nice - current_nice;
+  diff_idle   = next_idle - current_idle;
+
+  return static_cast<float>(diff_user + diff_system + diff_nice)/static_cast<float>(diff_user + diff_system + diff_nice + diff_idle)*100.0;
 }
 
-
-int main(int argc, char** argv)
+string cpu_string()
 {
   string meter = "[          ]";
   int meter_count = 0;
-  float percentage = 0.0;
-  CPUPercentage cpu_per;
-  cout.precision(1);
-  cout.setf(ios::fixed | ios::right);
-  cout.width(5);
-  try
-  {
-  while(true)
-    {
-    percentage = cpu_per.get_percentage();
+  float percentage;
+  ostringstream oss;
+  oss.precision( 1 );
+  oss.setf( ios::fixed | ios::right );
 
+  percentage = cpu_percentage();
   meter_count = 1;
   while(meter_count*9.99 < percentage)
     {
     meter[meter_count] = '|';
     meter_count++;
     }
-    while(meter_count <= 10)
+
+  oss << "CPU:";
+  oss << meter;
+  oss.width( 5 );
+  oss << percentage;
+  oss << "%";
+
+  return oss.str();
+}
+
+int main(int argc, char** argv)
+{
+  try
   {
-      meter[meter_count] = ' ';
-      meter_count++;
-      }
-    cout << meter << ' ';
-    cout.width(5);
-    cout << percentage << endl; 
-    sleep(1);
-    }
+  std::cout << cpu_string();
   }
   catch(const exception &e)
   {