Backend: Add unimined build system (#1456)

1 files changed, 50 insertions, 0 deletions

diff --git a/buildSrc/src/AutoMixinDiscovery.kt b/buildSrc/src/AutoMixinDiscovery.kt
new file mode 100644
index 000000000..f66229030
--- /dev/null
+++ b/buildSrc/src/AutoMixinDiscovery.kt
@@ -0,0 +1,50 @@
+import com.google.gson.GsonBuilder
+import com.google.gson.JsonArray
+import com.google.gson.JsonObject
+import com.google.gson.JsonPrimitive
+import org.apache.tools.ant.filters.BaseParamFilterReader
+import org.gradle.api.file.FileCopyDetails
+import org.gradle.api.tasks.SourceSet
+import java.io.File
+import java.io.Reader
+import java.io.StringReader
+
+class MixinFilterReader(reader: Reader) : BaseParamFilterReader() {
+    lateinit var sourceRoots: Collection<File>
+    val gson = GsonBuilder().setPrettyPrinting().create()
+    val betterReader: StringReader by lazy {
+        StringReader(run {
+            val json = gson.fromJson(reader.readText(), JsonObject::class.java)
+            val mixinPackage = (json["package"] as JsonPrimitive).asString
+            val allMixins = (json["mixins"] as JsonArray?)?.map { it.asString }?.toMutableSet() ?: mutableSetOf()
+            sourceRoots
+                .forEach { base ->
+                    base.walk()
+                        .filter { it.isFile }
+                        .forEach {
+                            val relativeString = it.toRelativeString(base).replace("\\", "/")
+                            if (relativeString.startsWith(mixinPackage.replace(".", "/") + "/")
+                                && relativeString.endsWith(".java")
+                                && it.readText().contains("@Mixin")
+                            )
+                                allMixins.add(
+                                    relativeString.replace("/", ".").dropLast(5).drop(mixinPackage.length + 1)
+                                )
+                        }
+                }
+            json.add("mixins", JsonArray().also { jsonAllMixins ->
+                allMixins.forEach { jsonAllMixins.add(it) }
+            })
+            gson.toJson(json)
+        })
+
+    }
+
+    override fun read(): Int {
+        return betterReader.read()
+    }
+}
+
+fun FileCopyDetails.autoDiscoverMixins(sourceSet: SourceSet) {
+    filter(mapOf("sourceRoots" to sourceSet.allSource.srcDirs), MixinFilterReader::class.java)
+}