Add compiler option to control code formatting

compiler/src/main/java/dagger/internal/codegen/CompilerOptions.java

@@ -37,6 +37,7 @@ abstract class CompilerOptions {
   abstract Diagnostic.Kind staticMemberValidationKind();
   abstract boolean ignorePrivateAndStaticInjectionForComponent();
   abstract ValidationType scopeCycleValidationType();
+  abstract boolean useFormattingFiler();
 
   static Builder builder() {
     return new AutoValue_CompilerOptions.Builder();
@@ -56,6 +57,7 @@ static CompilerOptions create(ProcessingEnvironment processingEnv, Elements elem
             ignorePrivateAndStaticInjectionForComponent(processingEnv)
                 .equals(FeatureStatus.DISABLED))
         .scopeCycleValidationType(scopeValidationType(processingEnv))
+        .useFormattingFiler(useFormattingFiler(processingEnv).equals(FeatureStatus.ENABLED))
         .build();
   }
 
@@ -69,11 +71,19 @@ interface Builder {
     Builder ignorePrivateAndStaticInjectionForComponent(
         boolean ignorePrivateAndStaticInjectionForComponent);
     Builder scopeCycleValidationType(ValidationType type);
+    Builder useFormattingFiler(boolean useFormattingFiler);
     CompilerOptions build();
   }
 
   static final String WRITE_PRODUCER_NAME_IN_TOKEN_KEY = "dagger.writeProducerNameInToken";
 
+  /**
+   * If true, Dagger will format generated code using a FormattingFiler.
+   *
+   * <p>This defaults to true, but can be useful for reducing compile times.
+   */
+  static final String USE_FORMATTING_FILER = "dagger.useFormattingFiler";
+
   static final String DISABLE_INTER_COMPONENT_SCOPE_VALIDATION_KEY =
       "dagger.disableInterComponentScopeValidation";
 
@@ -99,7 +109,8 @@ Builder ignorePrivateAndStaticInjectionForComponent(
         NULLABLE_VALIDATION_KEY,
         PRIVATE_MEMBER_VALIDATION_TYPE_KEY,
         STATIC_MEMBER_VALIDATION_TYPE_KEY,
-        IGNORE_PRIVATE_AND_STATIC_INJECTION_FOR_COMPONENT);
+        IGNORE_PRIVATE_AND_STATIC_INJECTION_FOR_COMPONENT,
+        USE_FORMATTING_FILER);
 
   private static FeatureStatus writeProducerNameInToken(ProcessingEnvironment processingEnv) {
     return valueOf(
@@ -117,6 +128,14 @@ private static ValidationType scopeValidationType(ProcessingEnvironment processi
         EnumSet.allOf(ValidationType.class));
   }
 
+  private static FeatureStatus useFormattingFiler(ProcessingEnvironment processingEnv) {
+    return valueOf(
+        processingEnv,
+        USE_FORMATTING_FILER,
+        FeatureStatus.ENABLED,
+        EnumSet.allOf(FeatureStatus.class));
+  }
+
   private static ValidationType nullableValidationType(ProcessingEnvironment processingEnv) {
     return valueOf(
         processingEnv,

compiler/src/main/java/dagger/internal/codegen/ComponentProcessor.java

@@ -63,7 +63,10 @@ protected Iterable<? extends ProcessingStep> initSteps() {
     Types types = processingEnv.getTypeUtils();
     Elements elements = processingEnv.getElementUtils();
     CompilerOptions compilerOptions = CompilerOptions.create(processingEnv, elements);
-    Filer filer =  new FormattingFiler(processingEnv.getFiler());
+
+    Filer filer = compilerOptions.useFormattingFiler()
+        ? new FormattingFiler(processingEnv.getFiler())
+        : processingEnv.getFiler();
 
     KeyFormatter keyFormatter = new KeyFormatter();
     MethodSignatureFormatter methodSignatureFormatter = new MethodSignatureFormatter(types);