Make builds reproducible allowing for verifying builds

[no changelog]

3 files changed, 114 insertions, 3 deletions

diff --git a/symbols/build.gradle.kts b/symbols/build.gradle.kts
index fad3221..c02f1d5 100644
--- a/symbols/build.gradle.kts
+++ b/symbols/build.gradle.kts
@@ -16,4 +16,5 @@ dependencies {
     ksp("dev.zacsweers.autoservice:auto-service-ksp:1.1.0")
     implementation("com.google.auto.service:auto-service-annotations:1.1.1")
     implementation("com.google.devtools.ksp:symbol-processing-api:1.9.23-1.0.20")
+    implementation("com.google.code.gson:gson:2.11.0")
 }
diff --git a/symbols/src/main/kotlin/process/MixinAnnotationProcessor.kt b/symbols/src/main/kotlin/process/MixinAnnotationProcessor.kt
new file mode 100644
index 0000000..ccfbdd7
--- /dev/null
+++ b/symbols/src/main/kotlin/process/MixinAnnotationProcessor.kt
@@ -0,0 +1,99 @@
+/*
+ * SPDX-FileCopyrightText: 2024 Linnea Gräf <nea@nea.moe>
+ *
+ * SPDX-License-Identifier: GPL-3.0-or-later
+ */
+
+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.Origin
+import com.google.gson.Gson
+import com.google.gson.JsonArray
+import com.google.gson.JsonObject
+
+
+class MixinAnnotationProcessor(
+    val codeGenerator: CodeGenerator,
+    val logger: KSPLogger
+) : SymbolProcessor {
+    @AutoService(SymbolProcessorProvider::class)
+    class Provider : SymbolProcessorProvider {
+        override fun create(environment: SymbolProcessorEnvironment): SymbolProcessor {
+            return MixinAnnotationProcessor(environment.codeGenerator, environment.logger)
+        }
+    }
+
+    val mixinPackage = "moe.nea.firmament.mixins"
+    val refmapName = "Firmament-refmap.json"
+    val mixinPlugin = "moe.nea.firmament.init.MixinPlugin"
+    val scaffold = """
+{
+    "required": true,
+    "plugin": "moe.nea.firmament.init.MixinPlugin",
+    "package": "{mixinPackage}",
+    "compatibilityLevel": "JAVA_17",
+    "injectors": {
+        "defaultRequire": 1
+    },
+    "refmap": "{refmapName}",
+    "client": {mixins}
+}
+"""
+    var rounds = mutableListOf<KSClassDeclaration>()
+
+    override fun process(resolver: Resolver): List<KSAnnotated> {
+        return resolver.getSymbolsWithAnnotation("org.spongepowered.asm.mixin.Mixin")
+            .filter { processElement(it, resolver) }.toList()
+    }
+
+    override fun finish() {
+        val output = codeGenerator.createNewFile(
+            Dependencies(
+                aggregating = true,
+                *rounds.map { it.containingFile!! }.toTypedArray()),
+            "", "firmament.mixins",
+            extensionName = "json")
+        val writer = output.writer()
+        val gson = Gson()
+        val mixinJson = JsonObject()
+        mixinJson.addProperty("required", true)
+        mixinJson.addProperty("plugin", mixinPlugin)
+        mixinJson.addProperty("package", mixinPackage)
+        mixinJson.addProperty("compatibilityLevel", "JAVA_21")
+        mixinJson.addProperty("refmap", refmapName)
+        val mixinArray = JsonArray()
+        rounds.map { it.qualifiedName!!.asString().removePrefix("$mixinPackage.") }
+            .sorted()
+            .forEach(mixinArray::add)
+        mixinJson.add("client", mixinArray)
+        gson.toJson(mixinJson, writer)
+        writer.close()
+        rounds
+    }
+
+    private fun processElement(decl: KSAnnotated, resolver: Resolver): Boolean {
+        if (decl !is KSClassDeclaration) {
+            logger.error("@Mixin only allowed on class declarations", decl)
+            return true
+        }
+        decl.qualifiedName ?: logger.error("@Mixin only allowed on classes with a proper name")
+        if (decl.origin != Origin.JAVA) logger.error("@Mixin only allowed in java code")
+        val packageName = decl.packageName.asString()
+        if (packageName != mixinPackage && !packageName.startsWith("$mixinPackage."))
+            logger.error("@Mixin outside of mixin package", decl)
+        rounds.add(decl)
+        return true
+    }
+
+
+}
diff --git a/symbols/src/main/kotlin/process/SubscribeAnnotationProcessor.kt b/symbols/src/main/kotlin/process/SubscribeAnnotationProcessor.kt
index 0999878..6d88b69 100644
--- a/symbols/src/main/kotlin/process/SubscribeAnnotationProcessor.kt
+++ b/symbols/src/main/kotlin/process/SubscribeAnnotationProcessor.kt
@@ -30,6 +30,7 @@ class SubscribeAnnotationProcessor(
     val codeGenerator: CodeGenerator,
 ) : SymbolProcessor {
     override fun finish() {
+        subscriptions.sort()
         val subscriptionSet = subscriptions.mapTo(mutableSetOf()) { it.parent.containingFile!! }
         val dependencies = Dependencies(
             aggregating = true,
@@ -39,8 +40,7 @@ class SubscribeAnnotationProcessor(
                 .createNewFile(dependencies, "moe.nea.firmament.annotations.generated", "AllSubscriptions")
                 .bufferedWriter()
         subscriptionsFile.apply {
-            appendLine("// This file is @generated by SubscribeAnnotationProcessor at ${SimpleDateFormat("yyyy-MM-dd HH:mm:ss z").format(
-                Date())}")
+            appendLine("// This file is @generated by SubscribeAnnotationProcessor")
             appendLine("// Do not edit")
             for (file in subscriptionSet) {
                 appendLine("// Dependency: ${file.filePath}")
@@ -70,7 +70,18 @@ class SubscribeAnnotationProcessor(
         val parent: KSClassDeclaration,
         val child: KSFunctionDeclaration,
         val type: KSType,
-    )
+    ) : Comparable<Subscription> {
+        override fun compareTo(other: Subscription): Int {
+            var compare = parent.qualifiedName!!.asString().compareTo(other.parent.qualifiedName!!.asString())
+            if (compare != 0) return compare
+            compare = other.child.simpleName.asString().compareTo(child.simpleName.asString())
+            if (compare != 0) return compare
+            compare = other.type.declaration.qualifiedName!!.asString()
+                .compareTo(type.declaration.qualifiedName!!.asString())
+            if (compare != 0) return compare
+            return 0
+        }
+    }
 
     val subscriptions = mutableListOf<Subscription>()