Limit the amount of changelog lines printed to 100. (#5352)

* Limit the amount of changelog lines printed to 100.

* Prevent double checks

* Set index at first new version

* Fix up changelog to only display newer versions than the last run
version, make messages more accurate, colour.

Co-authored-by: Llm Dl <LlmDlio@gmail.com>

src/com/palmergames/bukkit/towny/Towny.java

@@ -51,6 +51,7 @@
 import com.palmergames.bukkit.towny.utils.SpawnUtil;
 import com.palmergames.bukkit.towny.war.common.WarZoneListener;
 import com.palmergames.bukkit.util.BukkitTools;
+import com.palmergames.bukkit.util.Colors;
 import com.palmergames.bukkit.util.Version;
 import com.palmergames.util.FileMgmt;
 import com.palmergames.util.JavaUtil;
@@ -652,22 +653,46 @@ private void printChangelogToConsole() {
 
 		try {
 			List<String> changeLog = JavaUtil.readTextFromJar("/ChangeLog.txt");
-			boolean display = false;
-			plugin.getLogger().info("------------------------------------");
-			plugin.getLogger().info("ChangeLog up until v" + getVersion());
+			int startingIndex = 0;
+			int linesDisplayed = 0;
 			String lastVersion = Version.fromString(TownySettings.getLastRunVersion()).toString(); // Parse out any trailing text after the *.*.*.* version, ie "-for-1.12.2".
-			for (String line : changeLog) { // TODO: crawl from the bottom, then
-											// past from that index.
-				if (line.startsWith(lastVersion)) {
-					display = true;
+			plugin.getLogger().info("------------------------------------");
+			plugin.getLogger().info("ChangeLog since v" + lastVersion + ":");
+
+			// Go backwards through the changelog to get to the last run version.
+			for (int i = changeLog.size() - 1; i >= 0; i--) {
+				if (changeLog.get(i).startsWith(lastVersion)) {
+					// Go forwards through the changelog to find the next version after the last run version.
+					for (int j = i + 1; j < changeLog.size(); j++) {
+						if (!changeLog.get(j).trim().startsWith("-")) {
+							startingIndex = j;
+							break;
+						}
+					}
+					break;
 				}
-				if (display && line.replaceAll(" ", "").replaceAll("\t", "").length() > 0) {
-					Bukkit.getLogger().info(line);
+			}
+
+			if (startingIndex != 0) {
+				for (int i = startingIndex; i < changeLog.size(); i++) {
+					if (linesDisplayed > 100) {
+						plugin.getLogger().info(Colors.Yellow + "<snip>");
+						plugin.getLogger().info(Colors.Yellow + "Changelog continues for another " + (changeLog.size() - (startingIndex + 99)) + " lines.");
+						plugin.getLogger().info(Colors.Yellow + "To read the full changelog since " + lastVersion + ", go to https://github.com/TownyAdvanced/Towny/blob/master/resources/ChangeLog.txt#L" + ++startingIndex);
+						break;
+					} 
+					String line = changeLog.get(i);
+					if (line.replaceAll(" ", "").replaceAll("\t", "").length() > 0) {
+						Bukkit.getLogger().info(line.trim().startsWith("-") ? line : Colors.Yellow + line);
+						++linesDisplayed;
+					}
 				}
+			} else {
+				plugin.getLogger().warning("Could not find starting index for the changelog.");	
 			}
 			plugin.getLogger().info("------------------------------------");
 		} catch (IOException e) {
-			TownyMessaging.sendErrorMsg("Could not read ChangeLog.txt");
+			plugin.getLogger().warning("Could not read ChangeLog.txt");
 		}
 	}