F!! #301 added ability to create custom comparator

Author: LarsEckart

approvaltests-tests/src/test/java/org/approvaltests/OptionsTest.java

@@ -6,6 +6,7 @@
 import org.approvaltests.core.ApprovalFailureReporter;
 import org.approvaltests.core.ApprovalWriter;
 import org.approvaltests.core.Options;
+import org.approvaltests.core.VerifyResult;
 import org.approvaltests.reporters.FirstWorkingReporter;
 import org.approvaltests.reporters.UseReporter;
 import org.approvaltests.reporters.UseReporterTest;
@@ -183,4 +184,9 @@ public String getFileExtensionWithDot()
       return null;
     }
   }
+  @Test
+  void verifyCustomComparator()
+  {
+    Approvals.verify("The approval file is empty", new Options().withComparator((a, b) -> VerifyResult.SUCCESS));
+  }
 }

approvaltests/src/main/java/org/approvaltests/Approvals.java

@@ -172,7 +172,7 @@ public static void verify(ApprovalWriter writer, ApprovalNamer namer)
   }
   public static void verify(ApprovalWriter writer, ApprovalNamer namer, Options options)
   {
-    verify(new FileApprover(writer, namer), options);
+    verify(new FileApprover(writer, namer, options.getComparator()), options);
   }
   public static void verify(ApprovalWriter writer)
   {

approvaltests/src/main/java/org/approvaltests/core/Options.java

@@ -3,20 +3,23 @@
 import com.spun.util.ArrayUtils;
 import org.approvaltests.Approvals;
 import org.approvaltests.ReporterFactory;
+import org.approvaltests.approvers.FileApprover;
 import org.approvaltests.namer.ApprovalNamer;
 import org.approvaltests.namer.NamerWrapper;
 import org.approvaltests.scrubbers.NoOpScrubber;
 import org.approvaltests.writers.ApprovalWriterFactory;
 import org.approvaltests.writers.DefaultApprovalWriterFactory;
 import org.lambda.functions.Function1;
+import org.lambda.functions.Function2;
 
+import java.io.File;
 import java.util.HashMap;
 import java.util.Map;
 
 public class Options
 {
   private enum Fields {
-                       SCRUBBER, REPORTER, FILE_OPTIONS_FILE_EXTENSION, FILE_OPTIONS_NAMER, WRITER;
+                       SCRUBBER, REPORTER, FILE_OPTIONS_FILE_EXTENSION, FILE_OPTIONS_NAMER, WRITER, COMPARATOR;
   }
   private final Map<Fields, Object> fields = new HashMap<>();
   public Options()
@@ -47,6 +50,14 @@ public Options withReporter(ApprovalFailureReporter reporter)
   {
     return new Options(fields, Fields.REPORTER, reporter);
   }
+  public Function2<File, File, VerifyResult> getComparator()
+  {
+    return ArrayUtils.getOrElse(fields, Fields.COMPARATOR, () -> FileApprover::approveTextFile);
+  }
+  public Options withComparator(Function2<File, File, VerifyResult> comparator)
+  {
+    return new Options(fields, Fields.COMPARATOR, comparator);
+  }
   public Options withScrubber(Scrubber scrubber)
   {
     return new Options(fields, Fields.SCRUBBER, scrubber);