Add a CHANGES entry. Log only if totalProcessed>0

Author: blacelle

plugin-maven/CHANGES.md

@@ -4,6 +4,7 @@ We adhere to the [keepachangelog](https://keepachangelog.com/en/1.0.0/) format (
 
 ## [Unreleased]
 ### Added
+* A synthesis log with the number of considered files is added after each formatter execution [#1507](https://github.com/diffplug/spotless/pull/1507)
 ### Fixed
 * The default list of type annotations used by `formatAnnotations` has had 8 more annotations from the Checker Framework added [#1494](https://github.com/diffplug/spotless/pull/1494)
 ### Changes

plugin-maven/src/main/java/com/diffplug/spotless/maven/SpotlessApplyMojo.java

@@ -66,7 +66,9 @@ protected void process(Iterable<File> files, Formatter formatter, UpToDateChecke
 		int checkedButAlreadyClean = impactedFilesTracker.getCheckedButAlreadyClean();
 		int cleaned = impactedFilesTracker.getCleaned();
 		int totalProcessed = skippedAsCleanCache + checkedButAlreadyClean + cleaned;
-		getLog().info(String.format("Spotless.%s is keeping %s files clean - %s were changed to be clean, %s were already clean, %s were skipped because caching determined they were already clean",
-				formatter.getName(), totalProcessed, cleaned, checkedButAlreadyClean, skippedAsCleanCache));
+		if (totalProcessed > 0) {
+			getLog().info(String.format("Spotless.%s is keeping %s files clean - %s were changed to be clean, %s were already clean, %s were skipped because caching determined they were already clean",
+					formatter.getName(), totalProcessed, cleaned, checkedButAlreadyClean, skippedAsCleanCache));
+		}
 	}
 }