Generate identity mappings in srg file only for legacy forge

Cause modern versions of Forge do not need them.

2 files changed, 6 insertions, 4 deletions

diff --git a/src/main/java/net/fabricmc/loom/configuration/providers/mappings/MappingsProviderImpl.java b/src/main/java/net/fabricmc/loom/configuration/providers/mappings/MappingsProviderImpl.java
index 1d5ebb69..51cc4ef4 100644
--- a/src/main/java/net/fabricmc/loom/configuration/providers/mappings/MappingsProviderImpl.java
+++ b/src/main/java/net/fabricmc/loom/configuration/providers/mappings/MappingsProviderImpl.java
@@ -202,7 +202,7 @@ public class MappingsProviderImpl extends DependencyProvider implements Mappings
 			}
 
 			if (Files.notExists(srgToNamedSrg) || isRefreshDeps()) {
-				SrgNamedWriter.writeTo(getProject().getLogger(), srgToNamedSrg, getMappingsWithSrg(), "srg", "named");
+				SrgNamedWriter.writeTo(srgToNamedSrg, getMappingsWithSrg(), "srg", "named", getExtension().isLegacyForge());
 			}
 		}
 
diff --git a/src/main/java/net/fabricmc/loom/util/srg/SrgNamedWriter.java b/src/main/java/net/fabricmc/loom/util/srg/SrgNamedWriter.java
index f999f936..d7653297 100644
--- a/src/main/java/net/fabricmc/loom/util/srg/SrgNamedWriter.java
+++ b/src/main/java/net/fabricmc/loom/util/srg/SrgNamedWriter.java
@@ -36,18 +36,20 @@ import org.cadixdev.lorenz.io.srg.SrgWriter;
 import org.cadixdev.lorenz.model.ClassMapping;
 import org.cadixdev.lorenz.model.InnerClassMapping;
 import org.cadixdev.lorenz.model.TopLevelClassMapping;
-import org.gradle.api.logging.Logger;
 
 import net.fabricmc.lorenztiny.TinyMappingsReader;
 import net.fabricmc.mappingio.tree.MappingTree;
 
 public class SrgNamedWriter {
-	public static void writeTo(Logger logger, Path srgFile, MappingTree mappings, String from, String to) throws IOException {
+	public static void writeTo(Path srgFile, MappingTree mappings, String from, String to, boolean includeIdentityMappings) throws IOException {
 		Files.deleteIfExists(srgFile);
 
 		try (SrgWriter writer = new SrgWriter(Files.newBufferedWriter(srgFile))) {
 			try (TinyMappingsReader reader = new TinyMappingsReader(mappings, from, to)) {
-				writer.write(reader.read(MappingSet.create(new ClassesAlwaysHaveDeobfNameFactory())));
+				MappingSet mappingSet = includeIdentityMappings
+						? MappingSet.create(new ClassesAlwaysHaveDeobfNameFactory())
+						: MappingSet.create();
+				writer.write(reader.read(mappingSet));
 			}
 		}
 	}