fix: export maven/gradle, install runtime wrappers

src/main/java/dev/jbang/cli/App.java

@@ -6,7 +6,6 @@
 import java.nio.file.Paths;
 import java.nio.file.StandardCopyOption;
 import java.nio.file.StandardOpenOption;
-import java.nio.file.attribute.PosixFilePermission;
 import java.util.*;
 import java.util.concurrent.ConcurrentHashMap;
 import java.util.function.Function;
@@ -185,19 +184,7 @@ private static void installShellScript(Path file, String scriptRef, List<String>
 		List<String> lines = Arrays.asList("#!/bin/sh", cb.asCommandLine(Util.Shell.bash) + " \"$@\"");
 		Files.write(file, lines, StandardOpenOption.TRUNCATE_EXISTING, StandardOpenOption.CREATE);
 		if (!Util.isWindows()) {
-			setExecutable(file);
-		}
-	}
-
-	private static void setExecutable(Path file) {
-		final Set<PosixFilePermission> permissions;
-		try {
-			permissions = Files.getPosixFilePermissions(file);
-			permissions.add(PosixFilePermission.OWNER_EXECUTE);
-			permissions.add(PosixFilePermission.GROUP_EXECUTE);
-			Files.setPosixFilePermissions(file, permissions);
-		} catch (UnsupportedOperationException | IOException e) {
-			throw new ExitException(EXIT_GENERIC_ERROR, "Couldn't mark script as executable: " + file, e);
+			Util.setExecutable(file);
 		}
 	}
 

src/main/java/dev/jbang/cli/Export.java

@@ -5,6 +5,7 @@
 import java.io.File;
 import java.io.FileOutputStream;
 import java.io.IOException;
+import java.io.InputStream;
 import java.nio.channels.Channels;
 import java.nio.channels.ReadableByteChannel;
 import java.nio.file.*;
@@ -584,6 +585,9 @@ private void createProjectForExport(BuildContext ctx, Path projectDir) throws IO
 
 		// Build file
 		renderBuildFile(ctx, projectDir);
+
+		// Wrapper files
+		installWrapperFiles(ctx, projectDir);
 	}
 
 	private Path copySource(ResourceRef sourceRef, Path srcJavaDir)
@@ -609,6 +613,8 @@ private Path copySource(ResourceRef sourceRef, Path srcJavaDir)
 
 	abstract void renderBuildFile(BuildContext ctx, Path projectDir) throws IOException;
 
+	abstract void installWrapperFiles(BuildContext ctx, Path projectDir) throws IOException;
+
 	String getJavaVersion(Project prj, boolean minorVersionFor8) {
 		if (prj.getJavaVersion() == null) {
 			return null;
@@ -619,6 +625,24 @@ String getJavaVersion(Project prj, boolean minorVersionFor8) {
 		}
 		return javaVersion >= 9 ? Integer.toString(javaVersion) : "1." + javaVersion;
 	}
+
+	void copyWrapperFile(String srcPath, String dstPath, boolean execFlag) throws IOException {
+		File dstFile = new File(dstPath);
+		File dstDir = new File(dstFile.getParent());
+
+		dstDir.mkdirs();
+		InputStream ifs = this.getClass().getResourceAsStream(srcPath);
+		Files.copy(ifs, Paths.get(dstPath), StandardCopyOption.REPLACE_EXISTING);
+
+		if (Util.isWindows())
+			return;
+
+		if (execFlag) {
+			Util.setExecutable(dstFile.toPath());
+		}
+
+	}
+
 }
 
 @Command(name = "gradle", description = "Exports a Gradle project")
@@ -683,6 +707,17 @@ void renderBuildFile(BuildContext ctx, Path projectDir) throws IOException {
 		Util.writeString(projectDir.resolve("gradle.properties"), "org.gradle.configuration-cache=true\n");
 	}
 
+	@Override
+	void installWrapperFiles(BuildContext ctx, Path projectDir) throws IOException {
+		String dir = projectDir.getFileName().toString();
+		copyWrapperFile("/dist/gradle/gradlew", Paths.get(dir, "gradlew").toString(), true);
+		copyWrapperFile("/dist/gradle/gradlew.bat", Paths.get(dir, "gradlew.bat").toString(), false);
+		copyWrapperFile("/dist/gradle/gradle/wrapper/gradle-wrapper.properties",
+				Paths.get(dir, "gradle", "wrapper", "gradle-wrapper.properties").toString(), false);
+		copyWrapperFile("/dist/gradle/gradle/wrapper/gradle-wrapper-jar",
+				Paths.get(dir, "gradle", "wrapper", "gradle-wrapper.jar").toString(), false);
+	}
+
 	private List<String> gradleify(List<String> collectDependencies) {
 		return collectDependencies.stream().map(item -> {
 			if (item.endsWith("@pom")) {
@@ -772,4 +807,14 @@ void renderBuildFile(BuildContext ctx, Path projectDir) throws IOException {
 								.render();
 		Util.writeString(destination, result);
 	}
+
+	@Override
+	void installWrapperFiles(BuildContext ctx, Path projectDir) throws IOException {
+		String dir = projectDir.getFileName().toString();
+		copyWrapperFile("/dist/maven/mvnw", Paths.get(dir, "mvnw").toString(), true);
+		copyWrapperFile("/dist/maven/mvnw.cmd", Paths.get(dir, "mvnw.cmd").toString(), false);
+		copyWrapperFile("/dist/maven/.mvn/wrapper/maven-wrapper.properties",
+				Paths.get(dir, ".mvn", "wrapper", "maven-wrapper.properties").toString(), false);
+	}
+
 }

src/main/java/dev/jbang/util/Util.java

@@ -22,6 +22,7 @@
 import java.nio.file.*;
 import java.nio.file.attribute.BasicFileAttributes;
 import java.nio.file.attribute.FileTime;
+import java.nio.file.attribute.PosixFilePermission;
 import java.security.MessageDigest;
 import java.security.NoSuchAlgorithmException;
 import java.time.Duration;
@@ -1688,6 +1689,18 @@ private static boolean isExecutable(Path file) {
 		return false;
 	}
 
+	public static void setExecutable(Path file) {
+		final Set<PosixFilePermission> permissions;
+		try {
+			permissions = Files.getPosixFilePermissions(file);
+			permissions.add(PosixFilePermission.OWNER_EXECUTE);
+			permissions.add(PosixFilePermission.GROUP_EXECUTE);
+			Files.setPosixFilePermissions(file, permissions);
+		} catch (UnsupportedOperationException | IOException e) {
+			throw new ExitException(BaseCommand.EXIT_GENERIC_ERROR, "Couldn't mark script as executable: " + file, e);
+		}
+	}
+
 	/**
 	 * Converts a Path to a String. This is normally a trivial operation, but this
 	 * method handles the special case when running in a Bash shell on Windows,

src/main/resources/dist/gradle/gradle/wrapper/gradle-wrapper.properties

@@ -0,0 +1,7 @@
+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-8.9-bin.zip
+networkTimeout=10000
+validateDistributionUrl=true
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists