fix: compiler warning "Potential resource leak"

org.eclipse.tm4e.core/src/test/java/org/eclipse/tm4e/core/internal/theme/raw/RawThemeReaderTest.java

@@ -31,27 +31,29 @@ class RawThemeReaderTest {
 	@NonNullByDefault({})
 	void testLoadingThemes() throws IOException {
 		final var count = new AtomicInteger();
-		Files.list(Paths.get("../org.eclipse.tm4e.core.tests/src/main/resources/test-cases/themes")).forEach(file -> {
-			final var fileName = file.getFileName().toString();
-			if (fileName.endsWith(".json") && (fileName.contains("light") || fileName.contains("dark") || fileName.contains("black"))
-					|| fileName.endsWith(".tmTheme")) {
-				System.out.println("Parsing [" + file + "]...");
-				try {
-					final IRawTheme rawTheme = RawThemeReader.readTheme(IThemeSource.fromFile(file));
-					count.incrementAndGet();
-					assertFalse(castNonNull(rawTheme.getName()).isEmpty());
-					assertFalse(castNonNull(rawTheme.getSettings()).isEmpty());
-					for (final var setting : castNonNull(rawTheme.getSettings())) {
-						assertNotNull(setting.getSetting());
+		try (final var files = Files.list(Paths.get("../org.eclipse.tm4e.core.tests/src/main/resources/test-cases/themes"))) {
+			files.forEach(file -> {
+				final var fileName = file.getFileName().toString();
+				if (fileName.endsWith(".json") && (fileName.contains("light") || fileName.contains("dark") || fileName.contains("black"))
+						|| fileName.endsWith(".tmTheme")) {
+					System.out.println("Parsing [" + file + "]...");
+					try {
+						final IRawTheme rawTheme = RawThemeReader.readTheme(IThemeSource.fromFile(file));
+						count.incrementAndGet();
+						assertFalse(castNonNull(rawTheme.getName()).isEmpty());
+						assertFalse(castNonNull(rawTheme.getSettings()).isEmpty());
+						for (final var setting : castNonNull(rawTheme.getSettings())) {
+							assertNotNull(setting.getSetting());
+						}
+						final var theme = Theme.createFromRawTheme(rawTheme, null);
+						assertFalse(theme.getColorMap().isEmpty());
+						assertNotNull(theme.getDefaults());
+					} catch (final Exception ex) {
+						throw new RuntimeException(ex);
 					}
-					final var theme = Theme.createFromRawTheme(rawTheme, null);
-					assertFalse(theme.getColorMap().isEmpty());
-					assertNotNull(theme.getDefaults());
-				} catch (final Exception ex) {
-					throw new RuntimeException(ex);
 				}
-			}
-		});
+			});
+		}
 		System.out.println("Successfully parsed " + count.intValue() + " themes.");
 		assertTrue(count.intValue() > 10, "Only " + count.intValue() + " themes found, expected more than 10!");
 	}

org.eclipse.tm4e.language_pack/updater/src/main/java/updater/VSCodeMultiExtensionsSourceHandler.java

@@ -51,8 +51,8 @@ void handle() throws IOException {
 		logInfo("Locating valid VSCode grammar extensions...");
 		final Map<String, VsCodeExtensionPackageJson> pkgJsonByExtId = new HashMap<>();
 		final Map<String, Path> pkgJsonPathByExtId = new HashMap<>();
-		try (var l = withLogIndented()) {
-			for (final var dir : Files.list(sourceExtensionDir).filter(Files::isDirectory).toList()) {
+		try (var l = withLogIndented(); var files = Files.list(sourceExtensionDir)) {
+			for (final var dir : files.filter(Files::isDirectory).toList()) {
 				final var pkgJSONPath = dir.resolve("package.json");
 				if (!Files.exists(pkgJSONPath)) {
 					logInfo("Ignoring extension directory [" + dir.getFileName() + "] - no package.json found");

org.eclipse.tm4e.language_pack/updater/src/main/java/updater/utils/Git.java

@@ -21,6 +21,7 @@
 import java.util.ArrayList;
 import java.util.Comparator;
 import java.util.regex.Pattern;
+import java.util.stream.Stream;
 
 import com.fasterxml.jackson.annotation.JsonProperty;
 
@@ -114,10 +115,11 @@ public static GitCheckoutState gitSparseCheckout(final Path localPath, final Git
 				}
 
 				// delete local git repo if not in desired state
-				Files.walk(localPath) //
-						.sorted(Comparator.reverseOrder()) //
-						.map(Path::toFile) //
-						.forEach(File::delete);
+				try (Stream<Path> files = Files.walk(localPath)) {
+					files.sorted(Comparator.reverseOrder()) //
+							.map(Path::toFile) //
+							.forEach(File::delete);
+				}
 			}
 
 			Files.createDirectories(localPath);

org.eclipse.tm4e.language_pack/updater/src/main/java/updater/utils/Sys.java

@@ -149,9 +149,11 @@ public static void execVerbose(final Path workDir, final String cmd, final Strin
 	}
 
 	public static Optional<Path> findFirstFile(final Path path, final Predicate<String> nameFilter) throws IOException {
-		return Files.list(path) //
-				.filter(Files::isRegularFile) //
-				.filter(file -> nameFilter.test(file.getFileName().toString())).findFirst();
+		try (Stream<Path> files = Files.walk(path)) {
+			return files //
+					.filter(Files::isRegularFile) //
+					.filter(file -> nameFilter.test(file.getFileName().toString())).findFirst();
+		}
 	}
 
 	public static String getFileExtension(final Path path) {
@@ -165,10 +167,11 @@ public static String getFileExtension(final String path) {
 
 	public static void rmDir(final Path dir) throws IOException {
 		if (Files.exists(dir)) {
-			Files.walk(dir) //
-					.sorted(Comparator.reverseOrder()) //
-					.map(Path::toFile) //
-					.forEach(File::delete);
+			try (Stream<Path> files = Files.walk(dir)) {
+				files.sorted(Comparator.reverseOrder()) //
+						.map(Path::toFile) //
+						.forEach(File::delete);
+			}
 		}
 	}