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# lillero
*don't do coremods*
# Lillero
> ### Don't do coremods
A simple and slim ASM patching framework, allowing to modify block game code.
Lillero is a lightweight and simple ASM patching framework, empowering you to easily modify block game (byte)code, dunking on all the naysayers who said you absolutely had to use Mixin
## How
This library provides the core interface: `IInjector`. All patches which implement this interface and are defined as services will be loaded and applied at startup.
This library provides the core interface, `IInjector`, as well as a small set of utils to make your life easier. All patches should implement `IInjector` and be declared as [services](https://docs.oracle.com/javase/8/docs/api/java/util/ServiceLoader.html).
The following `IInjector` methods *must* be implemented
Some methods must be implemented, specifying which class and method will be patched:
* `targetClass()` : returns full name of class to patch (such as `net.minecraft.client.Minecraft`)
* `methodName()` : returns name (Searge obfuscated) of method to patch
* `methodDesc()` : returns descriptor (arguments and return type) of method to patch
* `inject(ClassNode clazz, MethodNode method)` : will be invoked providing correct class and method. This is where the actual patching happens
Some extra methods should also be implemented to help identify your patch:
* `targetClass()`: returns the *fully qualified name* of the class to patch (example: `net.minecraft.client.Minecraft`).
* `methodName()`: returns the "Searge name" of the method to patch.
* `methodDesc()`: returns descriptor (arguments and return type) of method to patch.
* `inject(ClassNode clazz, MethodNode method)`: will be invoked providing you the ClassNode and MethodNode you requested. This is where the actual patching will happen.
There's some more optional methods you *don't have to* implement, but really should because they will make your life considerably easier when it's time to debug:
* `name()` : returns patch name
* `reason()` : returns patch description
To make your classes service providers, a simple text file should be defined under `src/main/resources/META-INF/services` in your mod project: `ftbsc.lll.IInjector`. Inside such file, put full class paths of your patches.
Finally, you should mark your classes as service providers, by creating a text file called `ftbsc.lll.IInjector` in `src/main/resources/META-INF/services` on your project. Inside, put the fully qualified names of your patches (example: `ftbsc.bscv.asm.patches.TestPatch$TickPatch`).
To load patches created with this library, a Launch Plugin loader is necessary (such as our [lillero-loader](https://git.fantabos.co/lillero-loader/))
If you use Gradle (you do) don't forget to add this library as a dependency in your `build.gradle`:
```groovy
repositories {
maven { url = 'https://maven.fantabos.co' }
}
dependencies {
implementation 'ftbsc:lll:0.0.3'
}
```
**You are going to need a loader to use patches created with this library**. You can use our [lillero-loader](https://git.fantabos.co/lillero-loader/) or write your own: as long as it uses `IInjector` as patch interface, it won't break compatibility.
### Example
The following is an example patch, located at `src/main/java/example/patches/SamplePatch.java`:
```java
// file src/main/java/example/patches/SamplePatch.java
package example.patches;
import ftbsc.lll.IInjector;
public class SamplePatch implements IInjector {
@ -35,7 +49,15 @@ To load patches created with this library, a Launch Plugin loader is necessary (
main.instructions.insert(insnList);
}
}
```
// file src/main/resources/META-INF/services/ftbsc.lll.IInjector
The patch will crash the game with a NegativeArraySizeException as soon as it's done loading - so you know it's working.
The following is the service registration file, located at `src/main/resources/META-INF/services/ftbsc.lll.IInjector`:
```
example.patches.SamplePatch
```
Happy patching!
(it won't be happy)