some time refactors

no more weird totalTicks name
code looks better

src/timeutils.h

@@ -27,6 +27,23 @@
 
 #include "ta-utils.h"
 
+enum TATimeFormats: unsigned char {
+  TA_TIME_FORMAT_SECONDS=0, // seconds only
+  TA_TIME_FORMAT_MS, // m:ss
+  TA_TIME_FORMAT_HMS, // h:mm:ss
+
+  TA_TIME_FORMAT_MS_ZERO, // mm:ss
+  TA_TIME_FORMAT_HMS_ZERO, // hh:mm:ss
+
+  TA_TIME_FORMAT_DAYS_HMS, // years, months, days, h:mm:ss
+  TA_TIME_FORMAT_DAYS_HMS_ZERO, // years, months, days, hh:mm:ss
+
+  TA_TIME_FORMAT_AUTO, // automatic
+  TA_TIME_FORMAT_AUTO_ZERO, // automatic (zero)
+  TA_TIME_FORMAT_AUTO_MS, // automatic (from minutes)
+  TA_TIME_FORMAT_AUTO_MS_ZERO, // automatic (from minutes; zero)
+};
+
 struct TimeMicros {
   int seconds, micros;
 
@@ -37,13 +54,62 @@ struct TimeMicros {
     return seconds+(double)micros/1000000.0;
   }
 
+  // operators
+  inline TimeMicros& operator+(TimeMicros& other) {
+    seconds+=other.seconds;
+    micros+=other.micros;
+    while (micros>=1000000) {
+      micros-=1000000;
+      seconds++;
+    }
+    return *this;
+  }
+  inline TimeMicros& operator+(int other) {
+    seconds+=other;
+    return *this;
+  }
+  inline TimeMicros& operator-(TimeMicros& other) {
+    seconds-=other.seconds;
+    micros-=other.micros;
+    while (micros<0) {
+      micros+=1000000;
+      seconds--;
+    }
+    return *this;
+  }
+  inline TimeMicros& operator-(int other) {
+    seconds-=other;
+    return *this;
+  }
+
+  // comparison operators
+  inline bool operator==(TimeMicros& other) {
+    return (seconds==other.seconds && micros==other.micros);
+  }
+  inline bool operator>(TimeMicros& other) {
+    return (seconds>other.seconds || (seconds==other.seconds && micros>other.micros));
+  }
+  inline bool operator>=(TimeMicros& other) {
+    return (seconds>other.seconds || (seconds==other.seconds && micros>=other.micros));
+  }
+
+  inline bool operator!=(TimeMicros& other) {
+    return !(*this==other);
+  }
+  inline bool operator<(TimeMicros& other) {
+    return !(*this>=other);
+  }
+  inline bool operator<=(TimeMicros& other) {
+    return !(*this>other);
+  }
+
   /**
    * convert this TimeMicros to a String.
    * @param prec maximum digit precision (0-6). use -1 for automatic precision.
    * @param hms how many denominations to include (0: seconds, 1: minutes, 2: hours).
    * @return formatted TimeMicros.
    */
-  String toString(signed char prec=-1, unsigned char hms=0);
+  String toString(signed char prec=6, TATimeFormats hms=TA_TIME_FORMAT_SECONDS);
   static TimeMicros fromString(String s);
 
   TimeMicros(int s, int u):