Shading the CommandAPI in your plugins

Developer's note:

Shading the CommandAPI is not recommended. The CommandAPI is designed to run as a standalone plugin (similar to Vault or ProtocolLib) because it has to hook into events (which requires a plugin instance), it creates files (config.yml, command_registration.json) and has much better performance (uses one singular cache, only registers an event once etc. etc.). There are reports that multiple plugins with a shaded copy of the CommandAPI can result in plugin conflicts - this is not something that the CommandAPI plans to work on.

The CommandAPI does not offer the extensive level of support for issues with regards to using the shaded version of the CommandAPI, so consider using the plugin version instead!

Developer's Note:

I don't know very much about shading and dealing with shading conflicts. If you decide to use shading, you're on your own!

After 2 years, this most requested feature is finally here...

The CommandAPI can now be shaded into your own plugins! "Shading" is the process of including the CommandAPI inside your plugin, rather than requiring the CommandAPI as an external plugin. In other words, if you shade the CommandAPI into your plugin, you don't need to include the CommandAPI.jar in your server's plugins folder.

Shading vs CommandAPI plugin

The CommandAPI plugin has a few slight differences with the shaded CommandAPI jar file. The CommandAPI plugin has the following extra features that are not present in the shaded version:

Command conversion via a config.yml file
Creation of the command_registration.json file to show the Brigadier command graph

Shading requirements

For the CommandAPI to function as normal, you must call the CommandAPI's initializers in the onLoad() and onEnable() methods of your plugin:

CommandAPI.onLoad(CommandAPIConfig config);
CommandAPI.onEnable(Plugin plugin);

Loading

The onLoad(CommandAPIConfig) method initializes the CommandAPI's loading sequence. This must be called before you start to access the CommandAPI and must be placed in your plugin's onLoad() method. The argument CommandAPIConfig is used to configure how the CommandAPI. The CommandAPIConfig class has the following methods which let you set how the CommandAPI works similar to the config.yml, which is described here

class CommandAPIConfig {
    public CommandAPIConfig();
    
	public boolean isVerboseOutput();
	public CommandAPIConfig setVerboseOutput(boolean verboseOutput);
}

Enabling

The onEnable(Plugin) method initializes the CommandAPI's enabling sequence. As with the onLoad(boolean) method, this one must be placed in your plugin's onEnable() method. This isn't as strict as the onLoad(boolean) method, and can be placed anywhere in your onEnable() method. The argument plugin is your current plugin instance.

Example - Setting up the CommandAPI in your plugin

public class MyPlugin extends JavaPlugin {

    @Override
    public void onLoad() {
        CommandAPI.onLoad(true); //Load with verbose output
        
        new CommandAPICommand("ping")
            .executes((sender, args) -> {
                sender.sendMessage("pong!");
            })
            .register();
    }
    
    @Override
    public void onEnable() {
        CommandAPI.onEnable(this);
        
        //Register commands, listeners etc.
    }

}

Shading with Maven

To shade the CommandAPI into a maven project, you'll need to use the commandapi-shade dependency, which is optimized for shading and doesn't include plugin-specific files (such as plugin.yml):

<dependencies>
	<dependency>
		<groupId>dev.jorel</groupId>
        <artifactId>commandapi-shade</artifactId>
        <version>5.10</version>
    </dependency>
</dependencies>

Once you've added this this, you can shade the CommandAPI easily by adding the maven-shade-plugin to your build sequence:

<build>
    <plugins>
        <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-shade-plugin</artifactId>
            <version>3.2.4</version>
            <executions>
                <execution>
                    <id>shade</id>
                    <phase>package</phase>
                    <goals>
                        <goal>shade</goal>
                    </goals>
                </execution>
            </executions>
            <configuration>
                <relocations>
                    <relocation>
                        <pattern>dev.jorel.commandapi-shade</pattern>
                    </relocation>
                </relocations>
            </configuration>
        </plugin>
    </plugins>
</build>

Of course, if you shade the CommandAPI into your plugin, you don't need to add depend: [CommandAPI] to your plugin.yml file.

Shading with Gradle

To shade the CommandAPI into a Gradle project, we'll use the Gradle Shadow Plugin. Add this to your list of plugins:

plugins {
    id 'java'
    id 'com.github.johnrengelman.shadow' version '6.0.0'
}

Next, we declare our dependencies:

dependencies {
    compile "dev.jorel:commandapi-shade:5.10"   
}

Then we add it to the shadowJar task configuration:

shadowJar {
	dependencies {
		include dependency("dev.jorel:commandapi-shade:5.10")
	}
}

Finally, we can build the shaded jar using the following command:

gradlew build shadowJar

Again, as we're shading the CommandAPI into your plugin, we don't need to add depend: [CommandAPI] to your plugin.yml file.

CommandAPI Documentation v5.10