2 files changed, 102 insertions, 0 deletions
diff --git a/src/main/java/moe/nea/zwirn/RenameTask.java b/src/main/java/moe/nea/zwirn/RenameTask.java
new file mode 100644
index 0000000..89c15c4
--- /dev/null
+++ b/src/main/java/moe/nea/zwirn/RenameTask.java
@@ -0,0 +1,84 @@
+package moe.nea.zwirn;
+
+import net.fabricmc.stitch.commands.tinyv2.*;
+import org.jetbrains.annotations.NotNull;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.stream.Collectors;
+
+public class RenameTask {
+    private final TinyFile tinyFile;
+    private final List<Zwirn.RenameCommand> newNamespaceOrder;
+    private final int[] namespaceRemapOrder;
+
+    public RenameTask(@NotNull TinyFile tinyFile, @NotNull List<Zwirn.RenameCommand> newNamespaceOrder) {
+        this.tinyFile = tinyFile;
+        this.newNamespaceOrder = newNamespaceOrder;
+        namespaceRemapOrder = newNamespaceOrder.stream().mapToInt(
+                it -> tinyFile.getHeader().getNamespaces().indexOf(it.oldNamespaceName())
+        ).toArray();
+    }
+
+
+    private List<String> rename(List<String> strings) {
+        List<String> newNames = new ArrayList<>(namespaceRemapOrder.length);
+        for (int j : namespaceRemapOrder) {
+            newNames.add(strings.get(j));
+        }
+        return newNames;
+    }
+
+    public TinyFile rename() {
+        return new TinyFile(
+                new TinyHeader(newNamespaceOrder.stream().map(it -> it.newNamespaceName()).collect(Collectors.toList()), 2, 0, tinyFile.getHeader().getProperties()),
+                tinyFile.getClassEntries().stream().map(this::renameClass).collect(Collectors.toList())
+        );
+    }
+
+    private TinyClass renameClass(TinyClass tinyClass) {
+        return new TinyClass(
+                rename(tinyClass.getClassNames()),
+                tinyClass.getMethods().stream().map(this::renameMethod).collect(Collectors.toList()),
+                tinyClass.getFields().stream().map(this::renameField).collect(Collectors.toList()),
+                tinyClass.getComments()
+        );
+    }
+
+    private TinyField renameField(TinyField tinyField) {
+        var names = rename(tinyField.getFieldNames());
+        return new TinyField(
+                names.get(0),
+                names,
+                tinyField.getComments()
+        );
+    }
+
+    private TinyMethod renameMethod(TinyMethod tinyMethod) {
+        var names = rename(tinyMethod.getMethodNames());
+        return new TinyMethod(
+                names.get(0),
+                names,
+                tinyMethod.getParameters().stream().map(this::renameMethodParameter).collect(Collectors.toList()),
+                tinyMethod.getLocalVariables().stream().map(this::renameVariable).collect(Collectors.toList()),
+                tinyMethod.getComments()
+        );
+    }
+
+    private TinyMethodParameter renameMethodParameter(TinyMethodParameter tinyMethodParameter) {
+        return new TinyMethodParameter(
+                tinyMethodParameter.getLvIndex(),
+                rename(tinyMethodParameter.getParameterNames()),
+                tinyMethodParameter.getComments()
+        );
+    }
+
+    private TinyLocalVariable renameVariable(TinyLocalVariable tinyLocalVariable) {
+        return new TinyLocalVariable(
+                tinyLocalVariable.getLvIndex(), tinyLocalVariable.getLvStartOffset(),
+                tinyLocalVariable.getLvTableIndex(),
+                rename(tinyLocalVariable.getLocalVariableNames()),
+                tinyLocalVariable.getComments()
+        );
+    }
+}
diff --git a/src/main/java/moe/nea/zwirn/Zwirn.java b/src/main/java/moe/nea/zwirn/Zwirn.java
index 3612007..b3a4956 100644
--- a/src/main/java/moe/nea/zwirn/Zwirn.java
+++ b/src/main/java/moe/nea/zwirn/Zwirn.java
@@ -21,6 +21,24 @@ public class Zwirn {
         return new TinyMerger(base, overlay, sharedNamespace).merge();
     }
 
+
+    public record RenameCommand(
+            String oldNamespaceName,
+            String newNamespaceName
+    ) {
+    }
+
+    public static @NotNull TinyFile renameNamespaces(
+            @NotNull TinyFile tinyFile,
+            @NotNull List<@NotNull RenameCommand> newNamespaceOrder
+    ) {
+        for (var renameCommand : newNamespaceOrder) {
+            if (!tinyFile.getHeader().getNamespaces().contains(renameCommand.oldNamespaceName()))
+                throw new IllegalArgumentException("Old namespace " + renameCommand.oldNamespaceName() + " not found");
+        }
+        return new RenameTask(tinyFile, newNamespaceOrder).rename();
+    }
+
     public static @NotNull TinyFile enrichSeargeWithMCP(@NotNull TinyFile searge, @NotNull Path mcpArchiveRoot) throws IOException {
         if (!searge.getHeader().getNamespaces().equals(Arrays.asList("left", "right")))
             throw new IllegalArgumentException("Searge namespaces need to be left and right");