Implement Brigadier Mojang API

This is the start of a new module for Paper to add support for API's
that interface Mojang API's directly.

This allows us to version properly by MC version incase Mojang makes any major breaking changes.

It also lets us separate Mojang API's from Paper-API so our downstream friends at Glowstone
will not have to worry about Mojang code.

Adds AsyncPlayerSendCommandsEvent
  - Allows modifying on a per command basis what command data they see.

Adds CommandRegisteredEvent
  - Allows manipulating the CommandNode to add more children/metadata for the client

Spigot-Server-Patches/Handle-plugin-prefixes-using-Log4J-configuration.patch

@@ -15,7 +15,7 @@ This may cause additional prefixes to be disabled for plugins bypassing
 the plugin logger.
 
 diff --git a/pom.xml b/pom.xml
-index 14c4ec25..5a230592 100644
+index 24cdeb6ff4..ab8c61ab53 100644
 --- a/pom.xml
 +++ b/pom.xml
 @@ -0,0 +0,0 @@
@@ -28,7 +28,7 @@ index 14c4ec25..5a230592 100644
          <dependency>
              <groupId>org.apache.logging.log4j</groupId>
 diff --git a/src/main/java/org/spigotmc/SpigotConfig.java b/src/main/java/org/spigotmc/SpigotConfig.java
-index fdca3434..6d77bbc5 100644
+index fdca34346a..6d77bbc5aa 100644
 --- a/src/main/java/org/spigotmc/SpigotConfig.java
 +++ b/src/main/java/org/spigotmc/SpigotConfig.java
 @@ -0,0 +0,0 @@ public class SpigotConfig
@@ -41,7 +41,7 @@ index fdca3434..6d77bbc5 100644
  
      public static int playerShuffle;
 diff --git a/src/main/resources/log4j2.xml b/src/main/resources/log4j2.xml
-index 620b9490..a8bdaaea 100644
+index 620b9490e5..a8bdaaeaa1 100644
 --- a/src/main/resources/log4j2.xml
 +++ b/src/main/resources/log4j2.xml
 @@ -0,0 +0,0 @@

Spigot-Server-Patches/Implement-Brigadier-Mojang-API.patch

@@ -0,0 +1,108 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: Aikar <aikar@aikar.co>
+Date: Sun, 19 Apr 2020 18:15:29 -0400
+Subject: [PATCH] Implement Brigadier Mojang API
+
+Adds AsyncPlayerSendCommandsEvent
+  - Allows modifying on a per command basis what command data they see.
+
+Adds CommandRegisteredEvent
+  - Allows manipulating the CommandNode to add more children/metadata for the client
+
+diff --git a/src/main/java/net/minecraft/server/CommandDispatcher.java b/src/main/java/net/minecraft/server/CommandDispatcher.java
+index 2414b0a552..2d512aa4f9 100644
+--- a/src/main/java/net/minecraft/server/CommandDispatcher.java
++++ b/src/main/java/net/minecraft/server/CommandDispatcher.java
+@@ -0,0 +0,0 @@ public class CommandDispatcher {
+             bukkit.add(node.getName());
+         }
+         // Paper start - Async command map building
++        new com.destroystokyo.paper.event.brigadier.AsyncPlayerSendCommandsEvent<CommandListenerWrapper>(entityplayer.getBukkitEntity(), (RootCommandNode) rootcommandnode, false).callEvent(); // Paper
+         MinecraftServer.getServer().execute(() -> {
+            runSync(entityplayer, bukkit, rootcommandnode);
+         });
+@@ -0,0 +0,0 @@ public class CommandDispatcher {
+ 
+     private void runSync(EntityPlayer entityplayer, Collection<String> bukkit, RootCommandNode<ICompletionProvider> rootcommandnode) {
+         // Paper end - Async command map building
++        new com.destroystokyo.paper.event.brigadier.AsyncPlayerSendCommandsEvent<CommandListenerWrapper>(entityplayer.getBukkitEntity(), (RootCommandNode) rootcommandnode, false).callEvent(); // Paper
+         PlayerCommandSendEvent event = new PlayerCommandSendEvent(entityplayer.getBukkitEntity(), new LinkedHashSet<>(bukkit));
+         event.getPlayer().getServer().getPluginManager().callEvent(event);
+ 
+diff --git a/src/main/java/net/minecraft/server/CommandListenerWrapper.java b/src/main/java/net/minecraft/server/CommandListenerWrapper.java
+index 0b23a0548d..c988c929f1 100644
+--- a/src/main/java/net/minecraft/server/CommandListenerWrapper.java
++++ b/src/main/java/net/minecraft/server/CommandListenerWrapper.java
+@@ -0,0 +0,0 @@ import java.util.function.BinaryOperator;
+ import java.util.stream.Stream;
+ import javax.annotation.Nullable;
+ 
+-public class CommandListenerWrapper implements ICompletionProvider {
++public class CommandListenerWrapper implements ICompletionProvider, com.destroystokyo.paper.brigadier.BukkitBrigadierCommandSource { // Paper
+ 
+     public static final SimpleCommandExceptionType a = new SimpleCommandExceptionType(new ChatMessage("permissions.requires.player", new Object[0]));
+     public static final SimpleCommandExceptionType b = new SimpleCommandExceptionType(new ChatMessage("permissions.requires.entity", new Object[0]));
+@@ -0,0 +0,0 @@ public class CommandListenerWrapper implements ICompletionProvider {
+         return this.g;
+     }
+ 
++    // Paper start
++    @Override
++    public org.bukkit.entity.Entity getBukkitEntity() {
++        return getEntity() != null ? getEntity().getBukkitEntity() : null;
++    }
++
++    @Override
++    public org.bukkit.World getBukkitWorld() {
++        return getWorld() != null ? getWorld().getWorld() : null;
++    }
++
++    @Override
++    public org.bukkit.Location getBukkitLocation() {
++        Vec3D pos = getPosition();
++        org.bukkit.World world = getBukkitWorld();
++        return world != null && pos != null ? new org.bukkit.Location(world, pos.x, pos.y, pos.z) : null;
++    }
++    // Paper end
++
+     @Override
+     public boolean hasPermission(int i) {
+         // CraftBukkit start
+diff --git a/src/main/java/org/bukkit/craftbukkit/command/BukkitCommandWrapper.java b/src/main/java/org/bukkit/craftbukkit/command/BukkitCommandWrapper.java
+index 5f33c9e52a..e16ecdea7d 100644
+--- a/src/main/java/org/bukkit/craftbukkit/command/BukkitCommandWrapper.java
++++ b/src/main/java/org/bukkit/craftbukkit/command/BukkitCommandWrapper.java
+@@ -0,0 +0,0 @@ import net.minecraft.server.CommandListenerWrapper;
+ import org.bukkit.command.Command;
+ import org.bukkit.craftbukkit.CraftServer;
+ 
+-public class BukkitCommandWrapper implements com.mojang.brigadier.Command<CommandListenerWrapper>, Predicate<CommandListenerWrapper>, SuggestionProvider<CommandListenerWrapper> {
++public class BukkitCommandWrapper implements com.mojang.brigadier.Command<CommandListenerWrapper>, Predicate<CommandListenerWrapper>, SuggestionProvider<CommandListenerWrapper>, com.destroystokyo.paper.brigadier.BukkitBrigadierCommand<CommandListenerWrapper> { // Paper
+ 
+     private final CraftServer server;
+     private final Command command;
+@@ -0,0 +0,0 @@ public class BukkitCommandWrapper implements com.mojang.brigadier.Command<Comman
+     }
+ 
+     public LiteralCommandNode<CommandListenerWrapper> register(CommandDispatcher<CommandListenerWrapper> dispatcher, String label) {
+-        return dispatcher.register(
+-                LiteralArgumentBuilder.<CommandListenerWrapper>literal(label).requires(this).executes(this)
+-                .then(RequiredArgumentBuilder.<CommandListenerWrapper, String>argument("args", StringArgumentType.greedyString()).suggests(this).executes(this))
+-        );
++        // Paper start - Expose Brigadier to Paper-MojangAPI
++        com.mojang.brigadier.tree.RootCommandNode<CommandListenerWrapper> root = dispatcher.getRoot();
++        LiteralCommandNode<CommandListenerWrapper> literal = LiteralArgumentBuilder.<CommandListenerWrapper>literal(label).requires(this).executes(this).build();
++        com.mojang.brigadier.tree.ArgumentCommandNode<CommandListenerWrapper, String> defaultArgs = RequiredArgumentBuilder.<CommandListenerWrapper, String>argument("args", StringArgumentType.greedyString()).suggests(this).executes(this).build();
++        literal.addChild(defaultArgs);
++        com.destroystokyo.paper.event.brigadier.CommandRegisteredEvent<CommandListenerWrapper> event = new com.destroystokyo.paper.event.brigadier.CommandRegisteredEvent<>(label, this, this.command, root, literal, defaultArgs);
++        if (!event.callEvent()) {
++            return null;
++        }
++        literal = event.getLiteral();
++        root.addChild(literal);
++        return literal;
++        // Paper end
+     }
+ 
+     @Override
+--

Spigot-Server-Patches/Include-Log4J2-SLF4J-implementation.patch

@@ -5,7 +5,7 @@ Subject: [PATCH] Include Log4J2 SLF4J implementation
 
 
 diff --git a/pom.xml b/pom.xml
-index 5a230592..6f2fe9c2 100644
+index ab8c61ab53..76ce7f4486 100644
 --- a/pom.xml
 +++ b/pom.xml
 @@ -0,0 +0,0 @@

Spigot-Server-Patches/POM-Changes.patch

@@ -5,7 +5,7 @@ Subject: [PATCH] POM Changes
 
 
 diff --git a/pom.xml b/pom.xml
-index def28b3bec..3dc6c2a3f5 100644
+index def28b3bec..23f33d0477 100644
 --- a/pom.xml
 +++ b/pom.xml
 @@ -0,0 +0,0 @@
@@ -46,6 +46,12 @@ index def28b3bec..3dc6c2a3f5 100644
 -            <artifactId>spigot-api</artifactId>
 +            <groupId>com.destroystokyo.paper</groupId>
 +            <artifactId>paper-api</artifactId>
++            <version>${project.version}</version>
++            <scope>compile</scope>
++        </dependency>
++        <dependency>
++            <groupId>com.destroystokyo.paper</groupId>
++            <artifactId>paper-mojangapi</artifactId>
              <version>${project.version}</version>
              <scope>compile</scope>
          </dependency>

Spigot-Server-Patches/Use-Log4j-IOStreams-to-redirect-System.out-err-to-lo.patch

@@ -12,7 +12,7 @@ results in a separate line, even though it should not result in
 a line break. Log4j's implementation handles it correctly.
 
 diff --git a/pom.xml b/pom.xml
-index b1f00873..14c4ec25 100644
+index dea7bc2619..24cdeb6ff4 100644
 --- a/pom.xml
 +++ b/pom.xml
 @@ -0,0 +0,0 @@
@@ -28,7 +28,7 @@ index b1f00873..14c4ec25 100644
              <groupId>org.ow2.asm</groupId>
              <artifactId>asm</artifactId>
 diff --git a/src/main/java/net/minecraft/server/DedicatedServer.java b/src/main/java/net/minecraft/server/DedicatedServer.java
-index d34f772f..ec257ba3 100644
+index d34f772fae..ec257ba31f 100644
 --- a/src/main/java/net/minecraft/server/DedicatedServer.java
 +++ b/src/main/java/net/minecraft/server/DedicatedServer.java
 @@ -0,0 +0,0 @@ public class DedicatedServer extends MinecraftServer implements IMinecraftServer

Spigot-Server-Patches/Use-TerminalConsoleAppender-for-console-improvements.patch

@@ -19,7 +19,7 @@ Other changes:
     configuration
 
 diff --git a/pom.xml b/pom.xml
-index 3dc6c2a3f5..b1f008738b 100644
+index 23f33d0477..dea7bc2619 100644
 --- a/pom.xml
 +++ b/pom.xml
 @@ -0,0 +0,0 @@

Spigot-Server-Patches/Use-asynchronous-Log4j-2-loggers.patch

@@ -5,7 +5,7 @@ Subject: [PATCH] Use asynchronous Log4j 2 loggers
 
 
 diff --git a/pom.xml b/pom.xml
-index 6f2fe9c2..55679af9 100644
+index 76ce7f4486..28ff064c19 100644
 --- a/pom.xml
 +++ b/pom.xml
 @@ -0,0 +0,0 @@
@@ -24,7 +24,7 @@ index 6f2fe9c2..55679af9 100644
              <artifactId>asm</artifactId>
 diff --git a/src/main/java/com/destroystokyo/paper/log/LogFullPolicy.java b/src/main/java/com/destroystokyo/paper/log/LogFullPolicy.java
 new file mode 100644
-index 00000000..db652a1f
+index 0000000000..db652a1f7a
 --- /dev/null
 +++ b/src/main/java/com/destroystokyo/paper/log/LogFullPolicy.java
 @@ -0,0 +0,0 @@
@@ -46,7 +46,7 @@ index 00000000..db652a1f
 +    }
 +}
 diff --git a/src/main/resources/log4j2.component.properties b/src/main/resources/log4j2.component.properties
-index 0694b214..30efeb5f 100644
+index 0694b21465..30efeb5faf 100644
 --- a/src/main/resources/log4j2.component.properties
 +++ b/src/main/resources/log4j2.component.properties
 @@ -1 +1,3 @@