Fix windows bug in ratchetFrom

.circleci/config.yml

@@ -1,17 +1,23 @@
+version: 2.1
+orbs:
+  win: circleci/windows@2.4.0
+
 anchors:
   env_gradle: &env_gradle
     environment:
       # java doesn't play nice with containers, it tries to hog the entire machine
       # https://circleci.com/blog/how-to-handle-java-oom-errors/
       # try the experimental JVM option
       _JAVA_OPTIONS: "-XX:+UnlockExperimentalVMOptions -XX:+UseCGroupMemoryLimitForHeap"
-      GRADLE_OPTS: "-Dorg.gradle.workers.max=2" # and we're only allowed to use 2 vCPUs
+       # and we're only allowed to use 2 vCPUs
+      GRADLE_OPTS: "-Dorg.gradle.workers.max=2"
     docker:
       - image: cimg/openjdk:8.0
   env_gradle_large: &env_gradle_large
     << : *env_gradle
     resource_class: large # https://circleci.com/docs/2.0/configuration-reference/#resource_class
-    GRADLE_OPTS: "-Dorg.gradle.workers.max=4"
+    environment:
+      GRADLE_OPTS: "-Dorg.gradle.workers.max=4"
 
   restore_cache_wrapper: &restore_cache_wrapper
     restore_cache:
@@ -40,8 +46,6 @@ anchors:
           path: lib-extra/build/test-results/test
       - store_test_results:
           path: plugin-gradle/build/test-results/test
-
-version: 2
 jobs:
   # gradlew spotlessCheck assemble testClasses
   assemble_testClasses: 
@@ -105,6 +109,45 @@ jobs:
           path: plugin-maven/build/test-results/npm
       - store_test_results:
           path: plugin-gradle/build/test-results/npm
+  test_windows:
+    executor:
+      name: win/default
+      shell: cmd.exe
+    steps:
+      - checkout
+      # install openjdk8
+      - restore_cache:
+          key: choco2-ojdkbuild8
+      - run:
+          name: install 
+          command: choco install ojdkbuild8
+      - save_cache:
+          key: choco2-ojdkbuild8
+          paths:
+            - ~\AppData\Local\Temp\chocolatey\ojdkbuild8
+      # do the test
+      - restore_cache:
+          keys:
+          - gradle-deps-win-{{ checksum "build.gradle" }}-{{ checksum "gradle.properties" }}
+          - gradle-deps-win-
+      - run:
+          name: gradlew check
+          command: gradlew check --build-cache
+      - store_test_results:
+          path: testlib/build/test-results/test
+      - store_test_results:
+          path: lib-extra/build/test-results/test
+      - store_test_results:
+          path: plugin-gradle/build/test-results/test
+      - store_test_results:
+          path: plugin-maven/build/test-results/test
+      - save_cache:
+          paths:
+            - ~/.gradle/caches
+            - ~/.gradle/wrapper
+            - ~/.m2
+            - ~/project/plugin-maven/build/localMavenRepository
+          key: gradle-deps-win-{{ checksum "build.gradle" }}-{{ checksum "gradle.properties" }}
   changelog_print:
     << : *env_gradle
     steps:
@@ -158,6 +201,7 @@ workflows:
   version: 2
   assemble_and_test:
     jobs:
+      - test_windows
       - assemble_testClasses
       - test_justmaven_8:
           requires:

CHANGES.md

@@ -10,6 +10,7 @@ This document is intended for Spotless developers.
 We adhere to the [keepachangelog](https://keepachangelog.com/en/1.0.0/) format (starting after version `1.27.0`).
 
 ## [Unreleased]
+* We are now running CI on windows. ([#596](https://github.com/diffplug/spotless/pull/596))
 * We are now dogfooding `ratchetFrom` and `licenseHeader` with a `$YEAR` token to ensure that Spotless copyright headers stay up-to-date without adding noise to file history. ([#595](https://github.com/diffplug/spotless/pull/595))
 * Added `LineEnding.nativeIsWin()`, `FileSignature.pathNativeToUnix()`, and `FileSignature.pathUnixToNative()`, along with many API-invisible fixes and cleanup. ([#592](https://github.com/diffplug/spotless/pull/592))
 

lib/src/main/java/com/diffplug/spotless/FileSignature.java

@@ -112,7 +112,7 @@ public File getOnlyFile() {
 
 	/** Transforms a native path to a unix one. */
 	public static String pathNativeToUnix(String pathNative) {
-		return LineEnding.nativeIsWin() ? pathNative : pathNative.replace('\\', '/');
+		return LineEnding.nativeIsWin() ? pathNative.replace('\\', '/') : pathNative;
 	}
 
 	/** Transforms a unix path to a native one. */

plugin-gradle/CHANGES.md

@@ -4,6 +4,7 @@ We adhere to the [keepachangelog](https://keepachangelog.com/en/1.0.0/) format (
 
 ## [Unreleased]
 ### Fixed
+* `ratchetFrom` incorrectly marked every file as though it were clean on Windows.
 * Improved the warning message for `paddedCell` deprecation, along with many API-invisible fixes and cleanup. ([#592](https://github.com/diffplug/spotless/pull/592))
 
 ## [4.2.0] - 2020-06-03

plugin-gradle/src/main/java/com/diffplug/gradle/spotless/GitRatchet.java

@@ -44,6 +44,7 @@
 import com.diffplug.common.base.Errors;
 import com.diffplug.common.collect.HashBasedTable;
 import com.diffplug.common.collect.Table;
+import com.diffplug.spotless.FileSignature;
 
 class GitRatchet implements AutoCloseable {
 	/**
@@ -54,7 +55,7 @@ class GitRatchet implements AutoCloseable {
 	 */
 	public boolean isClean(Project project, ObjectId treeSha, File file) throws IOException {
 		Repository repo = repositoryFor(project);
-		String path = repo.getWorkTree().toPath().relativize(file.toPath()).toString();
+		String path = FileSignature.pathNativeToUnix(repo.getWorkTree().toPath().relativize(file.toPath()).toString());
 
 		// TODO: should be cached-per-repo if it is thread-safe, or per-repo-per-thread if it is not
 		DirCache dirCache = repo.readDirCache();

testlib/src/main/java/com/diffplug/spotless/JreVersion.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2016 DiffPlug
+ * Copyright 2016-2020 DiffPlug
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -27,7 +27,10 @@ public static JreVersion thisVm() {
 		} else if (jvmVersion.startsWith("11.")) {
 			return _11;
 		} else {
-			throw new IllegalStateException("Spotless build is only supported on Java 8 and Java 11");
+			int version = Integer.parseInt(jvmVersion.substring(0, jvmVersion.indexOf('.')));
+			JreVersion result = version > 11 ? _11 : _8;
+			System.err.println("WARNING: Only JRE 8 and 11 are officially supported, pretending unsupported version " + jvmVersion + " is JDK" + result.name());
+			return result;
 		}
 	}
 }