1 files changed, 63 insertions, 0 deletions
diff --git a/symbols/src/main/kotlin/process/CompatMetaProcessor.kt b/symbols/src/main/kotlin/process/CompatMetaProcessor.kt
new file mode 100644
index 0000000..0753e4c
--- /dev/null
+++ b/symbols/src/main/kotlin/process/CompatMetaProcessor.kt
@@ -0,0 +1,63 @@
+package moe.nea.firmament.annotations.process
+
+import com.google.auto.service.AutoService
+import com.google.devtools.ksp.processing.CodeGenerator
+import com.google.devtools.ksp.processing.Dependencies
+import com.google.devtools.ksp.processing.KSPLogger
+import com.google.devtools.ksp.processing.Resolver
+import com.google.devtools.ksp.processing.SymbolProcessor
+import com.google.devtools.ksp.processing.SymbolProcessorEnvironment
+import com.google.devtools.ksp.processing.SymbolProcessorProvider
+import com.google.devtools.ksp.symbol.KSAnnotated
+import com.google.devtools.ksp.symbol.KSClassDeclaration
+import com.google.devtools.ksp.symbol.KSName
+
+class CompatMetaProcessor(val logger: KSPLogger, val codeGenerator: CodeGenerator, val sourceSetName: String) :
+	SymbolProcessor {
+	override fun process(resolver: Resolver): List<KSAnnotated> {
+		val files = resolver.getAllFiles().toList()
+		val packages = files.mapTo(mutableSetOf()) { it.packageName.asString() }
+		packages.add("moe.nea.firmament.annotations.generated.$sourceSetName")
+		val compatMeta = resolver.getSymbolsWithAnnotation("moe.nea.firmament.util.compatloader.CompatMeta")
+			.singleOrNull() as KSClassDeclaration? ?: return listOf()
+		val dependencies = Dependencies(aggregating = true, *files.toTypedArray())
+		val generatedFileName = "GeneratedCompat${sourceSetName.replaceFirstChar { it.uppercaseChar() }}"
+		val compatFile =
+			codeGenerator.createNewFile(dependencies, "moe.nea.firmament.annotations.generated.$sourceSetName", generatedFileName)
+				.bufferedWriter()
+		compatFile.appendLine("// This file is @generated by SubscribeAnnotationProcessor")
+		compatFile.appendLine("// Do not edit")
+		compatFile.appendLine("package moe.nea.firmament.annotations.generated.$sourceSetName")
+		compatFile.appendLine("class $generatedFileName : moe.nea.firmament.util.compatloader.ICompatMetaGen {")
+		compatFile.appendLine("""
+	override fun owns(className: String): Boolean {
+		return moe.nea.firmament.util.compatloader.CompatHelper.isOwnedByPackage(className, ${
+			packages.joinToString { "\"" + it + "\"" }
+		})
+	}
+
+	override val meta: moe.nea.firmament.util.compatloader.ICompatMeta
+		get() = ${compatMeta.qualifiedName!!.asString()}
+""")
+		compatFile.appendLine("}")
+		compatFile.close()
+		val metaInf = codeGenerator.createNewFileByPath(
+			dependencies,
+			"META-INF/services/moe.nea.firmament.util.compatloader.ICompatMetaGen", extensionName = "")
+			.bufferedWriter()
+		metaInf.append("moe.nea.firmament.annotations.generated.$sourceSetName.")
+		metaInf.appendLine(generatedFileName)
+		metaInf.close()
+		return listOf()
+	}
+
+
+	@AutoService(SymbolProcessorProvider::class)
+	class Provider : SymbolProcessorProvider {
+		override fun create(environment: SymbolProcessorEnvironment): SymbolProcessor {
+			return CompatMetaProcessor(environment.logger,
+			                           environment.codeGenerator,
+			                           environment.options["firmament.sourceset"] ?: "main")
+		}
+	}
+}