From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Jason Penilla <11360596+jpenilla@users.noreply.github.com>
Date: Tue, 18 May 2021 14:39:44 -0700
Subject: [PATCH] Add command line option to load extra plugin jars not in the
 plugins folder

ex: java -jar paperclip.jar nogui -add-plugin=/path/to/plugin.jar -add-plugin=/path/to/another/plugin_jar.jar

diff --git a/src/main/java/org/bukkit/craftbukkit/CraftServer.java b/src/main/java/org/bukkit/craftbukkit/CraftServer.java
index fe5454f9e2507824c78cab3e31428608bf229ce1..d2c5221f7d0ed3cb04f160a9e77d9aba6ec206a4 100644
--- a/src/main/java/org/bukkit/craftbukkit/CraftServer.java
+++ b/src/main/java/org/bukkit/craftbukkit/CraftServer.java
@@ -398,10 +398,15 @@ public final class CraftServer implements Server {
     public void loadPlugins() {
         this.pluginManager.registerInterface(JavaPluginLoader.class);
 
-        File pluginFolder = (File) console.options.valueOf("plugins");
+        File pluginFolder = this.getPluginsFolder(); // Paper
 
-        if (pluginFolder.exists()) {
-            Plugin[] plugins = this.pluginManager.loadPlugins(pluginFolder);
+        // Paper start
+        if (true || pluginFolder.exists()) {
+            if (!pluginFolder.exists()) {
+                pluginFolder.mkdirs();
+            }
+            Plugin[] plugins = this.pluginManager.loadPlugins(pluginFolder, this.extraPluginJars());
+            // Paper end
             for (Plugin plugin : plugins) {
                 try {
                     String message = String.format("Loading %s", plugin.getDescription().getFullName());
@@ -416,6 +421,35 @@ public final class CraftServer implements Server {
         }
     }
 
+    // Paper start
+    @Override
+    public File getPluginsFolder() {
+        return (File) this.console.options.valueOf("plugins");
+    }
+
+    private List<File> extraPluginJars() {
+        @SuppressWarnings("unchecked")
+        final List<File> jars = (List<File>) this.console.options.valuesOf("add-plugin");
+        final List<File> list = new ArrayList<>();
+        for (final File file : jars) {
+            if (!file.exists()) {
+                net.minecraft.server.MinecraftServer.LOGGER.warn("File '{}' specified through 'add-plugin' argument does not exist, cannot load a plugin from it!", file.getAbsolutePath());
+                continue;
+            }
+            if (!file.isFile()) {
+                net.minecraft.server.MinecraftServer.LOGGER.warn("File '{}' specified through 'add-plugin' argument is not a file, cannot load a plugin from it!", file.getAbsolutePath());
+                continue;
+            }
+            if (!file.getName().endsWith(".jar")) {
+                net.minecraft.server.MinecraftServer.LOGGER.warn("File '{}' specified through 'add-plugin' argument is not a jar file, cannot load a plugin from it!", file.getAbsolutePath());
+                continue;
+            }
+            list.add(file);
+        }
+        return list;
+    }
+    // Paper end
+
     public void enablePlugins(PluginLoadOrder type) {
         if (type == PluginLoadOrder.STARTUP) {
             this.helpMap.clear();
diff --git a/src/main/java/org/bukkit/craftbukkit/Main.java b/src/main/java/org/bukkit/craftbukkit/Main.java
index aff3116c77277dcb4d3825d33f40a0b17258a0ba..ae4dc96da9e50ce8645e1b5da13e29085e916e98 100644
--- a/src/main/java/org/bukkit/craftbukkit/Main.java
+++ b/src/main/java/org/bukkit/craftbukkit/Main.java
@@ -142,6 +142,12 @@ public class Main {
                         .ofType(File.class)
                         .defaultsTo(new File("paper.yml"))
                         .describedAs("Yml file");
+
+                acceptsAll(asList("add-plugin", "add-extra-plugin-jar"), "Specify paths to extra plugin jars to be loaded in addition to those in the plugins folder. This argument can be specified multiple times, once for each extra plugin jar path.")
+                        .withRequiredArg()
+                        .ofType(File.class)
+                        .defaultsTo(new File[] {})
+                        .describedAs("Jar file");
                 // Paper end
             }
         };