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@@ -1,27 +1,41 @@ -# 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`). + +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' +} +``` -To load patches created with this library, a Launch Plugin loader is necessary (such as our [lillero-loader](https://git.fantabos.co/lillero-loader/)) +**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); } } +``` + +The patch will crash the game with a NegativeArraySizeException as soon as it's done loading - so you know it's working. -// file src/main/resources/META-INF/services/ftbsc.lll.IInjector +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)
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