give proguard the right jar based on mapping type

buildSrc/src/main/java/baritone/gradle/task/ProguardTask.java

@@ -18,10 +18,17 @@
 package baritone.gradle.task;
 
 import baritone.gradle.util.Determinizer;
+import baritone.gradle.util.MappingType;
+import baritone.gradle.util.ReobfWrapper;
 import com.google.gson.*;
+import java.lang.reflect.Field;
+import java.nio.file.StandardCopyOption;
+import java.util.stream.Collectors;
 import org.apache.commons.io.IOUtils;
+import org.gradle.api.NamedDomainObjectContainer;
 import org.gradle.api.artifacts.Configuration;
 import org.gradle.api.artifacts.Dependency;
+import org.gradle.api.internal.plugins.DefaultConvention;
 import org.gradle.api.tasks.Input;
 import org.gradle.api.tasks.TaskAction;
 import org.gradle.internal.Pair;
@@ -163,15 +170,13 @@ public class ProguardTask extends BaritoneGradleTask {
 
         // Iterate the required libraries to copy them to tempLibraries
         for (String lib : this.requiredLibraries) {
-            // Download the version jar from the URL acquired from the version manifest
-            if (lib.startsWith("minecraft")) {
-                String version = lib.split("-")[1];
-                Path versionJar = getTemporaryFile("tempLibraries/" + lib + ".jar");
-                if (!Files.exists(versionJar)) {
-                    JsonObject versionJson = PARSER.parse(new InputStreamReader(new URL(this.versionDownloadMap.get(version)).openStream())).getAsJsonObject();
-                    String url = versionJson.getAsJsonObject("downloads").getAsJsonObject("client").getAsJsonPrimitive("url").getAsString();
-                    write(new URL(url).openStream(), versionJar);
-                }
+            // copy from the forgegradle cache
+            if (lib.equals("minecraft")) {
+                final Path cachedJar = getMinecraftJar();
+                final Path inTempDir = getTemporaryFile("tempLibraries/" + "minecraft.jar");
+                // TODO: maybe try not to copy every time
+                Files.copy(cachedJar, inTempDir, StandardCopyOption.REPLACE_EXISTING);
+
                 continue;
             }
 
@@ -195,6 +200,88 @@ public class ProguardTask extends BaritoneGradleTask {
         }
     }
 
+    // a bunch of bullshit to get the path to the cached jar
+    private Path getMinecraftJar() throws Exception {
+        MappingType mappingType;
+        try {
+            mappingType = getMappingType();
+        } catch (Exception e) {
+            System.err.println("Failed to get mapping type, assuming NOTCH");
+            mappingType = MappingType.SEARGE;
+        }
+
+        String suffix;
+        switch (mappingType) {
+            case NOTCH:
+                suffix = "";
+                break;
+            case SEARGE:
+                suffix = "-srgBin";
+                break;
+            case CUSTOM:
+                throw new IllegalStateException("custom mappings not supported");
+            default:
+                throw new IllegalStateException("Unknown mapping type: " + mappingType);
+        }
+
+        DefaultConvention convention = (DefaultConvention)this.getProject().getConvention();
+        final Object extension = convention.getAsMap().get("minecraft");
+        Objects.requireNonNull(extension);
+
+        // for some reason cant use Class.forName
+        Class<?> class_baseExtension = extension.getClass().getSuperclass().getSuperclass().getSuperclass();
+        Field f_replacer = class_baseExtension.getDeclaredField("replacer");
+        f_replacer.setAccessible(true);
+        final Object replacer = f_replacer.get(extension);
+        Class<?> class_replacementProvider = replacer.getClass();
+        Field replacement_replaceMap = class_replacementProvider.getDeclaredField("replaceMap");
+        replacement_replaceMap.setAccessible(true);
+
+        final Map<String, Object> replacements = (Map)replacement_replaceMap.get(replacer);
+        final String cacheDir = replacements.get("CACHE_DIR").toString() + "/net/minecraft";
+        final String mcVersion = replacements.get("MC_VERSION").toString();
+        final String mcpInsert = replacements.get("MAPPING_CHANNEL").toString() + "/" + replacements.get("MAPPING_VERSION").toString();
+        final String fullJarName = "minecraft" + "-" + mcVersion + suffix + ".jar";
+
+        final String baseDir = String.format("%s/minecraft/%s/", cacheDir, mcVersion);
+
+        String jarPath;
+        if (mappingType == MappingType.SEARGE) {
+            jarPath = String.format("%s/%s/%s", baseDir, mcpInsert, fullJarName);
+
+        } else {
+            jarPath = baseDir + fullJarName;
+        }
+        jarPath = jarPath
+            .replace("/",  File.separator)
+            .replace("\\", File.separator);// fucking regex
+
+        return new File(jarPath).toPath();
+    }
+
+    // throws IllegalStateException if mapping type is ambiguous or it fails to find it
+    private MappingType getMappingType() {
+        // if it fails to find this then its probably a forgegradle version problem
+        final Set<Object> reobf = (NamedDomainObjectContainer<Object>) this.getProject().getExtensions().getByName("reobf");
+
+        final List<MappingType> mappingTypes = getUsedMappingTypes(reobf);
+        final long mappingTypesUsed = mappingTypes.size();
+        if (mappingTypesUsed == 0)
+            throw new IllegalStateException("Failed to find mapping type (no jar task?)");
+        if (mappingTypesUsed > 1)
+            throw new IllegalStateException("Ambiguous mapping type (multiple jars with different mapping types?)");
+
+        return mappingTypes.get(0);
+    }
+
+    private List<MappingType> getUsedMappingTypes(Set<Object> reobf) {
+        return reobf.stream()
+            .map(ReobfWrapper::new)
+            .map(ReobfWrapper::getMappingType)
+            .distinct()
+            .collect(Collectors.toList());
+    }
+
     private void proguardApi() throws Exception {
         runProguard(getTemporaryFile(PROGUARD_API_CONFIG));
         Determinizer.determinize(this.proguardOut.toString(), this.artifactApiPath.toString());

buildSrc/src/main/java/baritone/gradle/util/MappingType.java

@@ -0,0 +1,9 @@
+package baritone.gradle.util;
+
+// this should be the same as in ForgeGradle
+// credit 2 asmlibgradle (i made this btw)
+public enum MappingType {
+  SEARGE,
+  NOTCH,
+  CUSTOM // forgegradle
+}

buildSrc/src/main/java/baritone/gradle/util/ReobfWrapper.java

@@ -0,0 +1,40 @@
+package baritone.gradle.util;
+
+import java.lang.reflect.Field;
+import java.util.Objects;
+
+public class ReobfWrapper {
+
+  private final Object instance;
+  private final Class<?> type;
+
+  public ReobfWrapper(Object instance) {
+    this.instance = instance;
+    Objects.requireNonNull(instance);
+    this.type = instance.getClass();
+  }
+
+  public String getName() {
+    try {
+      Field nameField = type.getDeclaredField("name");
+      nameField.setAccessible(true);
+      return (String)nameField.get(this.instance);
+    } catch (ReflectiveOperationException ex) {
+      throw new Error(ex);
+    }
+  }
+
+  public MappingType getMappingType() {
+    try {
+      Field enumField = type.getDeclaredField("mappingType");
+      enumField.setAccessible(true);
+      Enum<?> meme = (Enum<?>) enumField.get(this.instance);
+      MappingType mappingType = MappingType.values()[meme.ordinal()];
+      if (!meme.name().equals(mappingType.name()))
+        throw new IllegalStateException("ForgeGradle ReobfMappingType is not equivalent to MappingType (version error?)");
+      return mappingType;
+    } catch (ReflectiveOperationException ex) {
+      throw new Error(ex);
+    }
+  }
+}

scripts/proguard.pro

@@ -31,7 +31,10 @@
 
 # copy all necessary libraries into tempLibraries to build
 
--libraryjars 'tempLibraries/minecraft-1.12.2.jar'
+-libraryjars 'tempLibraries/minecraft.jar'
+
+# The correct jar will be copied from the forgegradle cache based on the mapping type being compiled with
+#-libraryjars 'tempLibraries/minecraft.jar'
 
 -libraryjars 'tempLibraries/SimpleTweaker-1.2.jar'