statustime: Only update when the minute changes.

statustime.cpp

@@ -13,6 +13,8 @@ int main()
 {
     using fmt::format;
     using std::cout;
+    using clock = std::chrono::system_clock;
+    using std::chrono::minutes;
     using namespace std::chrono_literals;
 
     // Set explicitly, because LC_TIME is en_DK.UTF-8.
@@ -22,12 +24,15 @@ int main()
     {
         while (true)
         {
+            const auto now{clock::now()};
             cout << format(R"(<b><span color="orange">{0:%A}</span></b>, )"
                            R"({0:%Y-%m-%d} )"
                            R"(<span color="lightcyan">{0:%H:%M}</span>)",
-                           std::chrono::system_clock::now())
+                           now)
                  << std::endl; // NOTE: Don't forget that we need to flush! 😊
-            std::this_thread::sleep_for(1s);
+
+            const auto next_minute{std::chrono::floor<minutes>(now + 1min)};
+            std::this_thread::sleep_until(next_minute);
         }
     }
     catch (const std::exception &e)