Add release update checker and finish wiki docs

README.md

@@ -45,6 +45,12 @@ startup and logs the result to the console.
 Optional integration with DiscordSRV. Placeholder `%discord_online%` shows number of connected
 Discord users.
 
+## Updates
+
+On startup the plugin contacts GitHub to see if a newer release is available. If one is found a
+message with the version number and download link is printed to the console. Releases are
+published at [github.com/Locon213/LiveMotdManager/releases](https://github.com/Locon213/LiveMotdManager/releases).
+
 Additional documentation is available in the [wiki](wiki/Home.md).
 
 ## License

bungee/src/main/java/com/livemotdmanager/bungee/LiveMotdBungee.java

@@ -37,6 +37,7 @@ public void onEnable() {
         ProxyServer.getInstance().getPluginManager().registerListener(this, this);
         ProxyServer.getInstance().getPluginManager().registerCommand(this, new MotdCommand());
         setupLogger();
+        UpdateChecker.checkAsync(getDescription().getVersion(), getLogger());
     }
 
     @Override

core/src/main/java/com/livemotdmanager/core/UpdateChecker.java

@@ -0,0 +1,62 @@
+package com.livemotdmanager.core;
+
+import java.net.URI;
+import java.net.http.HttpClient;
+import java.net.http.HttpRequest;
+import java.net.http.HttpResponse;
+import java.util.logging.Logger;
+
+/**
+ * Simple GitHub release update checker.
+ */
+public final class UpdateChecker {
+    private static final String API_URL = "https://api.github.com/repos/Locon213/LiveMotdManager/releases/latest";
+    private static final String DOWNLOAD_URL = "https://github.com/Locon213/LiveMotdManager/releases";
+
+    private UpdateChecker() {}
+
+    public static void checkAsync(String currentVersion, Logger logger) {
+        new Thread(() -> check(currentVersion, logger)).start();
+    }
+
+    private static void check(String currentVersion, Logger logger) {
+        try {
+            HttpClient client = HttpClient.newHttpClient();
+            HttpRequest request = HttpRequest.newBuilder(URI.create(API_URL))
+                    .header("Accept", "application/vnd.github+json")
+                    .build();
+            HttpResponse<String> response = client.send(request, HttpResponse.BodyHandlers.ofString());
+            String latest = parseLatest(response.body());
+            if (latest != null && isNewer(latest, currentVersion)) {
+                logger.info("A new version of LiveMotdManager is available: " + latest + ". Download at " + DOWNLOAD_URL);
+            }
+        } catch (Exception e) {
+            logger.fine("Update check failed: " + e.getMessage());
+        }
+    }
+
+    private static String parseLatest(String json) {
+        int idx = json.indexOf("\"tag_name\"");
+        if (idx == -1) return null;
+        int start = json.indexOf('"', idx + 10) + 1;
+        int end = json.indexOf('"', start);
+        if (start == 0 || end == -1) return null;
+        String tag = json.substring(start, end);
+        return tag.startsWith("v") ? tag.substring(1) : tag;
+    }
+
+    private static boolean isNewer(String latest, String current) {
+        try {
+            String[] l = latest.split("\\.");
+            String[] c = current.split("\\.");
+            int max = Math.max(l.length, c.length);
+            for (int i = 0; i < max; i++) {
+                int li = i < l.length ? Integer.parseInt(l[i]) : 0;
+                int ci = i < c.length ? Integer.parseInt(c[i]) : 0;
+                if (li > ci) return true;
+                if (li < ci) return false;
+            }
+        } catch (NumberFormatException ignored) { }
+        return false;
+    }
+}

spigot/src/main/java/com/livemotdmanager/spigot/LiveMotdSpigot.java

@@ -40,6 +40,7 @@ public void onEnable() {
         getServer().getPluginManager().registerEvents(this, this);
         getCommand("motd").setExecutor(this);
         setupLogger();
+        UpdateChecker.checkAsync(getDescription().getVersion(), getLogger());
     }
 
     @Override

velocity/src/main/java/com/livemotdmanager/velocity/LiveMotdVelocity.java

@@ -40,6 +40,7 @@ public void init() {
         loadConfig();
         setupLogger();
         server.getCommandManager().register(server.getCommandManager().metaBuilder("motd").build(), new MotdCommand());
+        UpdateChecker.checkAsync(LiveMotdVelocity.class.getAnnotation(Plugin.class).version(), Logger.getLogger("LiveMotdManager"));
     }
 
     private void setupLogger() {

wiki/Home.md

@@ -18,8 +18,8 @@ and the MiniMessage formatted `text` to display.
 
 Set `weather.enable` to `true` and specify `city`. Use `%weather_motd%` or `%weather_city%`
 placeholders in your templates. The `weather.update-interval-minutes` option controls how often
-new data is fetched (default 10 minutes).NEED API KEY.
-
+new data is fetched (default 10 minutes). An API key from OpenWeather is required and must be
+placed in `weather.api-key`.
 
 ### Discord
 
@@ -34,6 +34,12 @@ Run `/motd help` in game for the complete list.
 - `/motd info` – show debug information
 - `/motd force <template|off>` – force a configured template
 
+## Updates
+
+The plugin checks for new releases on GitHub when it starts. If a newer version is available you
+will see a console message with a download link. Releases are available at
+[github.com/Locon213/LiveMotdManager/releases](https://github.com/Locon213/LiveMotdManager/releases).
+
 ## Building
 
 Run `mvn package` to build. Jars are created in each module's `target` directory with names like