Fix proguard rule gen not capturing non-sealed subtypes.

CHANGELOG.md

@@ -7,6 +7,8 @@ Changelog
 - Improve moshi-sealed KSP error messages.
 - Fix fallback adapter support in IR code gen not recognizing Moshi parameters to primary constructors.
 - Check for same subtypes before erroring on duplicate labels in moshi-sealed IR.
+- Fix proguard rule gen not capturing non-sealed subtypes.
+- Don't write empty proguard rule files if not rules were necessary.
 
 0.27.0
 ------

moshi-proguard-rule-gen/src/main/kotlin/dev/zacsweers/moshix/proguardgen/MoshiProguardGenSymbolProcessor.kt

@@ -98,6 +98,11 @@ public class MoshiProguardGenSymbolProcessor(private val environment: SymbolProc
               targetConstructorHasDefaults = false,
               targetConstructorParams = emptyList(),
             )
+
+          if (!enableMoshi && nestedSealedClassNames.isEmpty()) {
+            return emptyList()
+          }
+
           environment.logger.info(
             "MOSHI: Writing proguard rules for ${targetType.canonicalName}: $config",
             clazz,
@@ -163,6 +168,8 @@ public class MoshiProguardGenSymbolProcessor(private val environment: SymbolProc
       for (nested in getSealedSubclasses()) {
         nested.walkSealedSubtypes(elements, skipAnnotationCheck = false)
       }
+    } else {
+      elements += toClassName()
     }
   }
 

moshi-proguard-rule-gen/src/test/kotlin/dev/zacsweers/moshix/proguardgen/MoshiProguardGenSymbolProcessorTest.kt

@@ -80,14 +80,85 @@ class MoshiProguardGenSymbolProcessorTest(private val useKSP2: Boolean) {
       generatedFile.assertInCorrectPath()
       when (generatedFile.nameWithoutExtension) {
         "moshi-test.BaseType" ->
-          assertThat(generatedFile.readText())
-            .contains(
+          assertThat(generatedFile.readText().trimIndent())
+            .isEqualTo(
               """
                   # Conditionally keep this adapter for every possible nested subtype that uses it.
+                  -if class test.BaseType.TypeA
+                  -keep class test.BaseTypeJsonAdapter {
+                      public <init>(com.squareup.moshi.Moshi);
+                  }
+                  -if class test.BaseType.TypeB
+                  -keep class test.BaseTypeJsonAdapter {
+                      public <init>(com.squareup.moshi.Moshi);
+                  }
                   -if class test.BaseType.TypeC
                   -keep class test.BaseTypeJsonAdapter {
                       public <init>(com.squareup.moshi.Moshi);
                   }
+                  -if class test.BaseType.TypeC.TypeCImpl
+                  -keep class test.BaseTypeJsonAdapter {
+                      public <init>(com.squareup.moshi.Moshi);
+                  }
+                """
+                .trimIndent()
+            )
+        else -> error("Unrecognized proguard file: $generatedFile")
+      }
+    }
+  }
+
+  @Test
+  fun ensureNestedSealedClassesAreAdded() {
+    val source =
+      kotlin(
+        "BaseType.kt",
+        """
+      package test
+      import com.squareup.moshi.Json
+      import com.squareup.moshi.JsonClass
+      import dev.zacsweers.moshix.sealed.annotations.TypeLabel
+      import dev.zacsweers.moshix.sealed.annotations.NestedSealed
+      import dev.zacsweers.moshix.sealed.annotations.DefaultObject
+
+      @JsonClass(generateAdapter = true, generator = "sealed:type")
+        sealed class Message {
+
+            @TypeLabel("success")
+            @JsonClass(generateAdapter = true)
+            data class Success(
+                @Json(name = "value")
+                val value: String
+            ) : Message()
+
+            @DefaultObject
+            object Unknown : Message()
+        }
+    """,
+      )
+
+    val compilation = prepareCompilation(source)
+    val result = compilation.compile()
+    assertThat(result.exitCode).isEqualTo(ExitCode.OK)
+    val generatedSourcesDir = compilation.kspSourcesDir
+    val proguardFiles = generatedSourcesDir.walkTopDown().filter { it.extension == "pro" }.toList()
+    check(proguardFiles.isNotEmpty())
+    for (generatedFile in proguardFiles) {
+      generatedFile.assertInCorrectPath()
+      when (generatedFile.nameWithoutExtension) {
+        "moshi-test.Message" ->
+          assertThat(generatedFile.readText().trimIndent())
+            .isEqualTo(
+              """
+                  # Conditionally keep this adapter for every possible nested subtype that uses it.
+                  -if class test.Message.Success
+                  -keep class test.MessageJsonAdapter {
+                      public <init>(com.squareup.moshi.Moshi);
+                  }
+                  -if class test.Message.Unknown
+                  -keep class test.MessageJsonAdapter {
+                      public <init>(com.squareup.moshi.Moshi);
+                  }
                 """
                 .trimIndent()
             )
@@ -163,8 +234,8 @@ sealed class BaseType {
       generatedFile.assertInCorrectPath()
       when (generatedFile.nameWithoutExtension) {
         "moshi-test.BaseType" ->
-          assertThat(generatedFile.readText())
-            .contains(
+          assertThat(generatedFile.readText().trimIndent())
+            .isEqualTo(
               """
                   -if class test.BaseType
                   -keepnames class test.BaseType
@@ -174,10 +245,22 @@ sealed class BaseType {
                   }
 
                   # Conditionally keep this adapter for every possible nested subtype that uses it.
+                  -if class test.BaseType.TypeA
+                  -keep class test.BaseTypeJsonAdapter {
+                      public <init>(com.squareup.moshi.Moshi);
+                  }
+                  -if class test.BaseType.TypeB
+                  -keep class test.BaseTypeJsonAdapter {
+                      public <init>(com.squareup.moshi.Moshi);
+                  }
                   -if class test.BaseType.TypeC
                   -keep class test.BaseTypeJsonAdapter {
                       public <init>(com.squareup.moshi.Moshi);
                   }
+                  -if class test.BaseType.TypeC.TypeCImpl
+                  -keep class test.BaseTypeJsonAdapter {
+                      public <init>(com.squareup.moshi.Moshi);
+                  }
                 """
                 .trimIndent()
             )