Enable buttons and the display.

Kind-of-sort-of usable-ish.

Task.h

@@ -29,8 +29,8 @@ namespace Common {
 namespace Schedule {
 
 enum class ScheduleType {
-  AT_TIME,
-  NEVER,
+  AT_TIME = 0,
+  NEVER = 1,
 };
 
 class NextTime {
@@ -63,8 +63,38 @@ public:
         return { ScheduleType::AT_TIME, time };
     }
 
-    inline ScheduleType get_type() { return m_type; }
-    inline time_t get_time() { return m_time; }
+    inline ScheduleType get_type() const { return m_type; }
+    inline time_t get_time() const { return m_time; }
+
+    inline bool operator<(const NextTime other) const {
+        if (m_type < other.m_type) {
+            return true;
+        } else if (m_type == other.m_type) {
+            switch(m_type){
+            case ScheduleType::AT_TIME:
+                return m_time < other.m_time;
+            case ScheduleType::NEVER:
+                return false;
+            }
+            return false;
+        } else {
+            return false;
+        }
+    }
+
+    inline bool operator==(const NextTime other) const {
+        if (m_type != other.m_type) {
+            return false;
+        } else {
+            switch(m_type){
+            case ScheduleType::AT_TIME:
+                return m_time == other.m_time;
+            case ScheduleType::NEVER:
+                return true;
+            }
+            return false;
+        }
+    }
 
 private:
     NextTime(ScheduleType type, time_t time) :