Implement basic say command

src/main/java/wtf/beatrice/hidekobot/utils/FormatUtil.java

@@ -0,0 +1,50 @@
+package wtf.beatrice.hidekobot.utils;
+
+import wtf.beatrice.hidekobot.Configuration;
+
+import java.time.Duration;
+import java.time.LocalDateTime;
+import java.time.temporal.ChronoUnit;
+
+public class FormatUtil
+{
+
+    /**
+     * Generate a nicely formatted uptime String that omits unnecessary data
+     * (e.g. 0 days, 0 hours, 4 minutes, 32 seconds -> 4m 32s)
+     *
+     * @return the formatter String
+     */
+    public static String getNiceUptime()
+    {
+        LocalDateTime now = LocalDateTime.now();
+        long uptimeSeconds = ChronoUnit.SECONDS.between(Configuration.getStartupTime(), now);
+        Duration uptime = Duration.ofSeconds(uptimeSeconds);
+        long seconds = uptime.toSecondsPart();
+        long minutes = uptime.toMinutesPart();
+        long hours = uptime.toHoursPart();
+        long days = uptime.toDays();
+
+        StringBuilder uptimeStringBuilder = new StringBuilder();
+        if(days == 0)
+        {
+            if(hours == 0)
+            {
+                if(minutes == 0)
+                {} else {
+                    uptimeStringBuilder.append(minutes).append("m ");
+                }
+            } else {
+                uptimeStringBuilder.append(hours).append("h ");
+                uptimeStringBuilder.append(minutes).append("m ");
+            }
+        } else {
+            uptimeStringBuilder.append(days).append("d ");
+            uptimeStringBuilder.append(hours).append("h ");
+            uptimeStringBuilder.append(minutes).append("m ");
+        }
+        uptimeStringBuilder.append(seconds).append("s ");
+
+        return uptimeStringBuilder.toString();
+    }
+}