add util to open files / urls on every OS (#83)

src/main/java/com/gtnewhorizon/gtnhlib/util/FilesUtil.java

@@ -0,0 +1,58 @@
+package com.gtnewhorizon.gtnhlib.util;
+
+import java.io.IOException;
+import java.net.URI;
+
+import org.lwjgl.Sys;
+
+import com.gtnewhorizon.gtnhlib.GTNHLib;
+
+public class FilesUtil {
+
+    public static void openUri(URI uri) {
+        switch (net.minecraft.util.Util.getOSType()) {
+            case OSX -> {
+                try {
+                    Runtime.getRuntime().exec(new String[] { "/usr/bin/open", uri.toString() });
+                    return;
+                } catch (IOException e) {
+                    e.printStackTrace();
+                }
+            }
+            case WINDOWS -> {
+                try {
+                    Runtime.getRuntime()
+                            .exec(new String[] { "rundll32", "url.dll,FileProtocolHandler", uri.toString() });
+                    return;
+                } catch (IOException e) {
+                    e.printStackTrace();
+                }
+            }
+            case LINUX -> {
+                try {
+                    Runtime.getRuntime().exec(new String[] { "xdg-open", uri.toString() });
+                    return;
+                } catch (IOException e) {
+                    e.printStackTrace();
+                }
+            }
+            default -> {}
+        }
+        boolean openViaSystemClass = false;
+
+        try {
+            final Class<?> aClass = Class.forName("java.awt.Desktop");
+            final Object getDesktop = aClass.getMethod("getDesktop").invoke(null);
+            aClass.getMethod("browse", URI.class).invoke(getDesktop, uri);
+        } catch (Exception e) {
+            e.printStackTrace();
+            openViaSystemClass = true;
+        }
+
+        if (openViaSystemClass) {
+            GTNHLib.LOG.debug("Opening via system class!");
+            Sys.openURL("file://" + uri);
+        }
+    }
+
+}