Add option to configure management of trailing commas in ktfmt

CHANGES.md

@@ -16,6 +16,8 @@ We adhere to the [keepachangelog](https://keepachangelog.com/en/1.0.0/) format (
 * Renamed property `ktfmt` option `removeUnusedImport` -> `removeUnusedImports` to match `ktfmt`.  ([#2172](https://github.com/diffplug/spotless/pull/2172))
 ### Fixed
 * Fix compatibility issue introduced by `ktfmt` `0.51`. ([#2172](https://github.com/diffplug/spotless/issues/2172))
+### Added
+* Added option `manageTrailingCommas` to `ktfmt`.  ([#2177](https://github.com/diffplug/spotless/pull/2177))
 
 ## [3.0.0.BETA1] - 2024-06-04
 ### Added

lib/src/ktfmt/java/com/diffplug/spotless/glue/ktfmt/KtfmtFormatterFunc.java

@@ -75,8 +75,8 @@ private FormattingOptions createFormattingOptions() throws Exception {
 					ktfmtFormattingOptions.getMaxWidth().orElse(formattingOptions.getMaxWidth()),
 					ktfmtFormattingOptions.getBlockIndent().orElse(formattingOptions.getBlockIndent()),
 					ktfmtFormattingOptions.getContinuationIndent().orElse(formattingOptions.getContinuationIndent()),
-					formattingOptions.getManageTrailingCommas(),
-					ktfmtFormattingOptions.getRemoveUnusedImport().orElse(formattingOptions.getRemoveUnusedImports()),
+					ktfmtFormattingOptions.getManageTrailingCommas().orElse(formattingOptions.getManageTrailingCommas()),
+					ktfmtFormattingOptions.getRemoveUnusedImports().orElse(formattingOptions.getRemoveUnusedImports()),
 					formattingOptions.getDebuggingPrintOpsAfterFormatting());
 		}
 

lib/src/ktfmt/java/com/diffplug/spotless/glue/ktfmt/KtfmtFormattingOptions.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2022 DiffPlug
+ * Copyright 2022-2024 DiffPlug
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -32,17 +32,22 @@ public final class KtfmtFormattingOptions {
 	private Integer continuationIndent;
 
 	@Nullable
-	private Boolean removeUnusedImport;
+	private Boolean removeUnusedImports;
+
+	@Nullable
+	private Boolean manageTrailingCommas;
 
 	public KtfmtFormattingOptions(
 			@Nullable Integer maxWidth,
 			@Nullable Integer blockIndent,
 			@Nullable Integer continuationIndent,
-			@Nullable Boolean removeUnusedImport) {
+			@Nullable Boolean removeUnusedImports,
+			@Nullable Boolean manageTrailingCommas) {
 		this.maxWidth = maxWidth;
 		this.blockIndent = blockIndent;
 		this.continuationIndent = continuationIndent;
-		this.removeUnusedImport = removeUnusedImport;
+		this.removeUnusedImports = removeUnusedImports;
+		this.manageTrailingCommas = manageTrailingCommas;
 	}
 
 	@Nonnull
@@ -61,8 +66,13 @@ public Optional<Integer> getContinuationIndent() {
 	}
 
 	@Nonnull
-	public Optional<Boolean> getRemoveUnusedImport() {
-		return Optional.ofNullable(removeUnusedImport);
+	public Optional<Boolean> getRemoveUnusedImports() {
+		return Optional.ofNullable(removeUnusedImports);
+	}
+
+	@Nonnull
+	public Optional<Boolean> getManageTrailingCommas() {
+		return Optional.ofNullable(manageTrailingCommas);
 	}
 
 	public void setMaxWidth(int maxWidth) {
@@ -86,7 +96,11 @@ public void setContinuationIndent(int continuationIndent) {
 		this.continuationIndent = continuationIndent;
 	}
 
-	public void setRemoveUnusedImport(boolean removeUnusedImport) {
-		this.removeUnusedImport = removeUnusedImport;
+	public void setRemoveUnusedImports(boolean removeUnusedImports) {
+		this.removeUnusedImports = removeUnusedImports;
+	}
+
+	public void setManageTrailingCommas(boolean manageTrailingCommas) {
+		this.manageTrailingCommas = manageTrailingCommas;
 	}
 }

lib/src/main/java/com/diffplug/spotless/kotlin/KtfmtStep.java

@@ -126,17 +126,22 @@ public static class KtfmtFormattingOptions implements Serializable {
 		@Nullable
 		private Boolean removeUnusedImports = null;
 
+		@Nullable
+		private Boolean manageTrailingCommas = null;
+
 		public KtfmtFormattingOptions() {}
 
 		public KtfmtFormattingOptions(
 				@Nullable Integer maxWidth,
 				@Nullable Integer blockIndent,
 				@Nullable Integer continuationIndent,
-				@Nullable Boolean removeUnusedImports) {
+				@Nullable Boolean removeUnusedImports,
+				@Nullable Boolean manageTrailingCommas) {
 			this.maxWidth = maxWidth;
 			this.blockIndent = blockIndent;
 			this.continuationIndent = continuationIndent;
 			this.removeUnusedImports = removeUnusedImports;
+			this.manageTrailingCommas = manageTrailingCommas;
 		}
 
 		public void setMaxWidth(int maxWidth) {
@@ -154,6 +159,10 @@ public void setContinuationIndent(int continuationIndent) {
 		public void setRemoveUnusedImports(boolean removeUnusedImports) {
 			this.removeUnusedImports = removeUnusedImports;
 		}
+
+		public void setManageTrailingCommas(boolean manageTrailingCommas) {
+			this.manageTrailingCommas = manageTrailingCommas;
+		}
 	}
 
 	/** Creates a step which formats everything - code, import order, and unused imports. */
@@ -228,9 +237,9 @@ FormatterFunc createFormat() throws Exception {
 			}
 
 			final Constructor<?> optionsConstructor = ktfmtFormattingOptionsClass.getConstructor(
-					Integer.class, Integer.class, Integer.class, Boolean.class);
+					Integer.class, Integer.class, Integer.class, Boolean.class, Boolean.class);
 			final Object ktfmtFormattingOptions = optionsConstructor.newInstance(
-					options.maxWidth, options.blockIndent, options.continuationIndent, options.removeUnusedImports);
+					options.maxWidth, options.blockIndent, options.continuationIndent, options.removeUnusedImports, options.manageTrailingCommas);
 			if (style == null) {
 				final Constructor<?> constructor = formatterFuncClass.getConstructor(ktfmtFormattingOptionsClass);
 				return (FormatterFunc) constructor.newInstance(ktfmtFormattingOptions);
@@ -365,7 +374,7 @@ private Object getCustomFormattingOptions(Class<?> formatterClass) throws Except
 							/* continuationIndent = */ Optional.ofNullable(options.continuationIndent).orElse((Integer) formattingOptionsClass.getMethod("getContinuationIndent").invoke(formattingOptions)),
 							/* removeUnusedImports = */ Optional.ofNullable(options.removeUnusedImports).orElse((Boolean) formattingOptionsClass.getMethod("getRemoveUnusedImports").invoke(formattingOptions)),
 							/* debuggingPrintOpsAfterFormatting = */ (Boolean) formattingOptionsClass.getMethod("getDebuggingPrintOpsAfterFormatting").invoke(formattingOptions),
-							/* manageTrailingCommas */ (Boolean) formattingOptionsClass.getMethod("getManageTrailingCommas").invoke(formattingOptions));
+							/* manageTrailingCommas */ Optional.ofNullable(options.manageTrailingCommas).orElse((Boolean) formattingOptionsClass.getMethod("getManageTrailingCommas").invoke(formattingOptions)));
 				}
 			}
 

plugin-gradle/CHANGES.md

@@ -9,6 +9,8 @@ We adhere to the [keepachangelog](https://keepachangelog.com/en/1.0.0/) format (
 * Renamed property `ktfmt` option `removeUnusedImport` -> `removeUnusedImports` to match `ktfmt`.  ([#2172](https://github.com/diffplug/spotless/pull/2172))
 ### Fixed
 * Fix compatibility issue introduced by `ktfmt` `0.51`. ([#2172](https://github.com/diffplug/spotless/issues/2172))
+### Added
+* Added option `manageTrailingCommas` to `ktfmt`.  ([#2177](https://github.com/diffplug/spotless/pull/2177))
 
 ## [7.0.0.BETA1] - 2024-06-04
 ### Added

plugin-gradle/README.md

@@ -399,6 +399,7 @@ spotless {
       it.setBlockIndent(4)
       it.setContinuationIndent(4)
       it.setRemoveUnusedImports(false)
+      it.setManageTrailingCommas(false)
     }
   }
 }

plugin-gradle/src/test/java/com/diffplug/gradle/spotless/KotlinExtensionTest.java

@@ -59,6 +59,7 @@ void integrationKtfmtDropboxStyleWithPublicApi() throws IOException {
 				"            it.setBlockIndent(4)",
 				"            it.setContinuationIndent(4)",
 				"            it.setRemoveUnusedImports(false)",
+				"            it.setManageTrailingCommas(false)",
 				"        }",
 				"    }",
 				"}");

plugin-maven/CHANGES.md

@@ -9,6 +9,8 @@ We adhere to the [keepachangelog](https://keepachangelog.com/en/1.0.0/) format (
 * Renamed property `ktfmt` option `removeUnusedImport` -> `removeUnusedImports` to match `ktfmt`.  ([#2172](https://github.com/diffplug/spotless/pull/2172))
 ### Fixed
 * Fix compatibility issue introduced by `ktfmt` `0.51`. ([#2172](https://github.com/diffplug/spotless/issues/2172))
+### Added
+* Added option `manageTrailingCommas` to `ktfmt`.  ([#2177](https://github.com/diffplug/spotless/pull/2177))
 
 ## [2.44.0.BETA1] - 2024-06-04
 ### Added

plugin-maven/README.md

@@ -402,6 +402,7 @@ Groovy-Eclipse formatting errors/warnings lead per default to a build failure. T
   <blockIndent>4</blockIndent> <!-- optional -->
   <continuationIndent>8</continuationIndent> <!-- optional -->
   <removeUnusedImports>false</removeUnusedImports> <!-- optional -->
+  <manageTrailingCommas>true</manageTrailingCommas> <!-- optional -->
 </ktfmt>
 ```
 

plugin-maven/src/main/java/com/diffplug/spotless/maven/kotlin/Ktfmt.java

@@ -44,11 +44,14 @@ public class Ktfmt implements FormatterStepFactory {
 	@Parameter
 	private Boolean removeUnusedImports;
 
+	@Parameter
+	private Boolean manageTrailingCommas;
+
 	@Override
 	public FormatterStep newFormatterStep(FormatterStepConfig config) {
 		String version = this.version != null ? this.version : KtfmtStep.defaultVersion();
 		Style style = this.style != null ? Style.valueOf(this.style) : null;
-		KtfmtFormattingOptions options = new KtfmtFormattingOptions(maxWidth, blockIndent, continuationIndent, removeUnusedImports);
+		KtfmtFormattingOptions options = new KtfmtFormattingOptions(maxWidth, blockIndent, continuationIndent, removeUnusedImports, manageTrailingCommas);
 		return KtfmtStep.create(version, config.getProvisioner(), style, options);
 	}
 }

plugin-maven/src/test/java/com/diffplug/spotless/maven/kotlin/KtfmtTest.java

@@ -71,4 +71,13 @@ void testKtfmtStyleWithMaxWidthOption() throws Exception {
 		mavenRunner().withArguments("spotless:apply").runNoError();
 		assertFile("src/main/kotlin/main.kt").sameAsResource("kotlin/ktfmt/max-width-dropbox.clean");
 	}
+
+	@Test
+	void testKtfmtWithManageTrailingCommasOption() throws Exception {
+		writePomWithKotlinSteps("<ktfmt><version>0.49</version><style>DROPBOX</style><manageTrailingCommas>true</manageTrailingCommas></ktfmt>");
+
+		setFile("src/main/kotlin/main.kt").toResource("kotlin/ktfmt/trailing-commas.dirty");
+		mavenRunner().withArguments("spotless:apply").runNoError();
+		assertFile("src/main/kotlin/main.kt").sameAsResource("kotlin/ktfmt/trailing-commas.clean");
+	}
 }

testlib/src/main/resources/kotlin/ktfmt/trailing-commas.clean

@@ -0,0 +1,11 @@
+import a.*
+
+fun foo(
+    paramA: String,
+    paramB: Int,
+    anotherParamIsHere: Float,
+    myLongParamNameIsHere: CustomType,
+    lastParam: Boolean,
+) = Unit
+
+fun bar(myLongParamNameIsHereButDoesNotWrap: Int) = Unit

testlib/src/main/resources/kotlin/ktfmt/trailing-commas.dirty

@@ -0,0 +1,8 @@
+import a.*
+
+fun foo(paramA: String,paramB : Int , anotherParamIsHere: Float ,myLongParamNameIsHere: CustomType
+,lastParam: Boolean ) = Unit
+
+fun bar(
+    myLongParamNameIsHereButDoesNotWrap: Int,
+) = Unit

testlib/src/test/java/com/diffplug/spotless/kotlin/KtfmtStepTest.java

@@ -62,6 +62,14 @@ void dropboxStyle_0_50() throws Exception {
 		StepHarness.forStep(step).testResource("kotlin/ktfmt/basic.dirty", "kotlin/ktfmt/basic-dropboxstyle.clean");
 	}
 
+	@Test
+	void behaviorWithTrailingCommas() throws Exception {
+		KtfmtStep.KtfmtFormattingOptions options = new KtfmtStep.KtfmtFormattingOptions();
+		options.setManageTrailingCommas(true);
+		FormatterStep step = KtfmtStep.create("0.49", TestProvisioner.mavenCentral(), KtfmtStep.Style.DROPBOX, options);
+		StepHarness.forStep(step).testResource("kotlin/ktfmt/trailing-commas.dirty", "kotlin/ktfmt/trailing-commas.clean");
+	}
+
 	@Test
 	void equality() throws Exception {
 		new SerializableEqualityTester() {