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feat: Implement --export-to-gradle-project feature
This commit introduces the new command-line option `--export-to-gradle-project <script> <output_dir>`, which allows you to generate a complete, standalone Gradle project from an existing kscript file. This "last mile toolkit" feature facilitates graduating a kscript into a more formal project structure, ready for further development, testing, and packaging using standard Gradle workflows. Key functionalities implemented in `ProjectGenerator.kt`: - Parses the input kscript for dependencies, Maven repositories, package name, and entry point using kscript's internal resolvers. - Creates the specified output directory. - Determines project properties (group, name, version), intelligently deriving the group and main class from script annotations or defaults. - Generates `settings.gradle.kts` with the project name. - Generates a comprehensive `build.gradle.kts` including: - Kotlin JVM and Application plugins (using kscript's own Kotlin version, e.g., 2.2.0-RC2, and targeting Java 21). - Project group and version. - Maven Central and any custom repositories from the script. - Kotlin standard library and all dependencies from the script. - Application main class configuration. - Standard Kotlin compiler options and Java toolchain settings. - Creates the standard Maven/Gradle directory structure: - `src/main/kotlin/[package_path]` - `src/main/resources` - `src/test/kotlin/[package_path]` - `src/test/resources` - Transforms the original kscript content by: - Removing the shebang and kscript-specific file-level annotations. - Adding an appropriate package declaration. - Saves the result as a `.kt` file within `src/main/kotlin/[package_path]`. - Generates a `.gitignore` file with common Kotlin/Gradle patterns. - Copies and configures the Gradle Wrapper (`gradlew`, `gradlew.bat`, `gradle/wrapper/*`) from kscript's own project, ensuring the generated project uses a consistent and recent Gradle version (e.g., 8.14.1). The command-line interface in `Kscript.kt` and option parsing in `OptionsUtils.kt` have been updated to support this new feature.
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‎src/main/kotlin/io/github/kscripting/kscript/Kscript.kt‎

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@@ -93,6 +93,46 @@ fun main(args: Array<String>) {
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return
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}
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// Handle --export-to-gradle-project
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if (parsedOptions.containsKey("export-to-gradle-project")) {
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val outputDirPathValue = parsedOptions["export-to-gradle-project"]
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val scriptPathValue = parsedOptions["script"] // Script path is taken from remaining args
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// Basic validation
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if (scriptPathValue == null || scriptPathValue.isBlank()) {
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errorMsg("The <script> argument is required for --export-to-gradle-project.")
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exitProcess(1)
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}
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if (outputDirPathValue == null || outputDirPathValue.isBlank()) {
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errorMsg("The <output_dir> argument for --export-to-gradle-project is required.")
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exitProcess(1)
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}
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val scriptFile = java.nio.file.Paths.get(scriptPathValue).toFile()
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if (!scriptFile.exists()) {
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errorMsg("Script file not found: $scriptPathValue")
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exitProcess(1)
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}
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// scriptPathValue is already validated to be non-null/blank
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// outputDirPathValue is also validated
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try {
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io.github.kscripting.kscript.generator.exportToGradleProject(
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scriptFilePathString = scriptPathValue!!, // scriptPathValue is a String
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outputDir = java.nio.file.Paths.get(outputDirPathValue!!),
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cliOptions = parsedOptions.toMap(),
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config = config // Pass the config object
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)
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info("Gradle project export process finished for '$scriptPathValue' to '$outputDirPathValue'.")
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exitProcess(0)
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} catch (e: Exception) {
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errorMsg("Error during --export-to-gradle-project for script '$scriptPathValue': ${e.message}")
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e.printStackTrace() // For detailed debugging during development
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exitProcess(1)
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}
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}
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KscriptHandler(executor, config, parsedOptions).handle(userArgs)
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} catch (e: Exception) {
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errorMsg(e)

‎src/main/kotlin/io/github/kscripting/kscript/generator/ProjectGenerator.kt‎

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package io.github.kscripting.kscript.generator
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import io.github.kscripting.kscript.util.Logger.errorMsg
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import io.github.kscripting.kscript.util.Logger.infoMsg
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package io.github.kscripting.kscript.generator
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import io.github.kscripting.kscript.cache.Cache
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import io.github.kscripting.kscript.model.Config
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import io.github.kscripting.kscript.model.Script
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import io.github.kscripting.kscript.parser.Parser
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import io.github.kscripting.kscript.resolver.InputOutputResolver
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import io.github.kscripting.kscript.resolver.ScriptResolver
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import io.github.kscripting.kscript.resolver.SectionResolver
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import io.github.kscripting.kscript.util.Logger.errorMsg
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import io.github.kscripting.kscript.util.Logger.infoMsg
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import java.io.File // Keep this for scriptFile parameter if needed by Kscript.kt, but internally use scriptFilePath
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import java.nio.file.Files
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import java.nio.file.Path
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import java.nio.file.Paths // Added for Paths.get()
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import java.util.Locale // Added for titlecase
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// Changed signature: scriptFile: File -> scriptFilePath: String, added config: Config
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fun exportToGradleProject(scriptFilePathString: String, outputDir: Path, cliOptions: Map<String, String?>, config: Config) {
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// Remove duplicate package declaration that might have been introduced by previous edits
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// package io.github.kscripting.kscript.generator // This line is effectively a comment if it was duplicated
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val scriptFile = File(scriptFilePathString) // Create File object for name and extension access
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infoMsg("Attempting to export script '$scriptFilePathString' to new Gradle project at '$outputDir'...")
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infoMsg("Output directory: ${outputDir.toAbsolutePath()}")
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try {
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// Instantiate Script object
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val cache = Cache(config.osConfig.cacheDir)
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val inputOutputResolver = InputOutputResolver(config.osConfig, cache)
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val sectionResolver = SectionResolver(inputOutputResolver, Parser(), config.scriptingConfig)
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val scriptResolver = ScriptResolver(inputOutputResolver, sectionResolver, config.scriptingConfig)
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// Resolve the script (this reads content, parses annotations, etc.)
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// For project generation, we typically don't want to include external preambles like text mode.
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val script = scriptResolver.resolve(scriptFilePathString, preambles = emptyList())
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infoMsg("Successfully parsed script: ${script.scriptLocation.scriptName}")
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// Ensure output directory exists
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if (Files.exists(outputDir)) {
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infoMsg("Output directory '$outputDir' already exists. Files may be overwritten.")
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} else {
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Files.createDirectories(outputDir)
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infoMsg("Successfully created directory: $outputDir")
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}
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// 1. Determine Project Properties
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val projectName = outputDir.fileName.toString()
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// Try to use script package name for group, fallback to default
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val projectGroup = if (script.packageName.value.isNotBlank()) script.packageName.value else "com.example"
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val projectVersion = "1.0-SNAPSHOT" // Default version
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infoMsg("Project Name: $projectName")
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infoMsg("Project Group: $projectGroup")
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infoMsg("Project Version: $projectVersion")
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// 2. Create standard project directories
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val srcMainKotlinPath = projectGroup.replace(".", "/")
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val srcMainKotlinDir = outputDir.resolve("src/main/kotlin").resolve(srcMainKotlinPath)
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val srcMainResourcesDir = outputDir.resolve("src/main/resources")
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val srcTestKotlinDir = outputDir.resolve("src/test/kotlin").resolve(srcMainKotlinPath)
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val srcTestResourcesDir = outputDir.resolve("src/test/resources")
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Files.createDirectories(srcMainKotlinDir)
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infoMsg("Successfully created directory: $srcMainKotlinDir")
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Files.createDirectories(srcMainResourcesDir)
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infoMsg("Successfully created directory: $srcMainResourcesDir")
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Files.createDirectories(srcTestKotlinDir)
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infoMsg("Successfully created directory: $srcTestKotlinDir")
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Files.createDirectories(srcTestResourcesDir)
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infoMsg("Successfully created directory: $srcTestResourcesDir")
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// 3. Generate settings.gradle.kts
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val settingsFile = outputDir.resolve("settings.gradle.kts")
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val settingsContent = """
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|rootProject.name = "$projectName"
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|""".trimMargin()
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Files.writeString(settingsFile, settingsContent)
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infoMsg("Successfully generated: $settingsFile")
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// 4. Construct build.gradle.kts Content
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val dependenciesString = script.dependencies.joinToString("\n ") { "implementation(\"${it.value}\")" }
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val customReposString = script.repositories.joinToString("\n ") { "maven { url = uri(\"${it.value}\") }" }
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// Determine main class name
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val scriptBaseName = scriptFile.nameWithoutExtension.replaceFirstChar { if (it.isLowerCase()) it.titlecase() else it.toString() }
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val mainClassName = script.entryPoint?.value ?: "${projectGroup}.${scriptBaseName}Kt"
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// Kotlin options and compiler options (basic for now)
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// More complex mapping can be done later. For now, just ensure jvmTarget.
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// val joinedCompilerOpts = script.compilerOpts.joinToString(", ") { "\"${it.value}\"" } // Example if needed
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val buildGradleKtsContent = """
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|plugins {
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| kotlin("jvm") version "${config.scriptingConfig.kotlinVersion}" // Use kscript's current Kotlin version
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| application
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|}
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|
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|group = "$projectGroup"
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|version = "$projectVersion"
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|
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|repositories {
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| mavenCentral()
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| $customReposString
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|}
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|
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|dependencies {
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| implementation(kotlin("stdlib")) // Or kotlin("stdlib-jdk8") depending on preference
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| $dependenciesString
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|}
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|
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|application {
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| mainClass.set("$mainClassName")
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| // applicationDefaultJvmArgs = listOf(${script.kotlinOpts.joinToString(", ") { "\"${it.value}\"" }}) // Example
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|}
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|
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|tasks.withType<org.jetbrains.kotlin.gradle.tasks.KotlinCompile> {
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| compilerOptions {
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| jvmTarget.set(org.jetbrains.kotlin.gradle.dsl.JvmTarget.JVM_21) // Match kscript's build
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| // if (listOf($joinedCompilerOpts).isNotEmpty()) {
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| // freeCompilerArgs.addAll(listOf($joinedCompilerOpts))
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| // }
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| }
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|}
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|
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|java {
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| toolchain {
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| languageVersion.set(JavaLanguageVersion.of(21)) // Match kscript's build
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| }
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|}
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|""".trimMargin()
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// 5. Write build.gradle.kts File
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val buildGradleKtsFile = outputDir.resolve("build.gradle.kts")
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Files.writeString(buildGradleKtsFile, buildGradleKtsContent)
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infoMsg("Successfully generated: $buildGradleKtsFile")
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// TODO (remaining from original list):
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// 7. Generate .gitignore
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// 8. Add Gradle Wrapper (./gradlew files)
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// 6. Place and Transform Script Content
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val targetKtFile = srcMainKotlinDir.resolve("${scriptBaseName}.kt")
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val originalLines = script.resolvedCode.lines()
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val contentLines = mutableListOf<String>()
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// Add package declaration
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if (projectGroup.isNotBlank()) {
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contentLines.add("package $projectGroup")
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contentLines.add("") // Add a blank line after package
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}
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var firstLineSkipped = false
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for (line in originalLines) {
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if (!firstLineSkipped && line.trim().startsWith("#!/")) {
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firstLineSkipped = true
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continue // Skip shebang
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}
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val trimmedLine = line.trim()
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if (trimmedLine.startsWith("@file:DependsOn") ||
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trimmedLine.startsWith("@file:Repository") || // Matches Script.kt model
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trimmedLine.startsWith("@file:KotlinOptions") ||
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trimmedLine.startsWith("@file:CompilerOptions") ||
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trimmedLine.startsWith("@file:EntryPoint")) {
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// Skip kscript-specific file-level annotations
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continue
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}
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contentLines.add(line)
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}
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Files.writeString(targetKtFile, contentLines.joinToString("\n"))
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infoMsg("Successfully transformed and placed script content at: $targetKtFile")
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// 7. Generate .gitignore
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val gitignoreFile = outputDir.resolve(".gitignore")
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// Simplified .gitignore content to avoid issues with complex multiline strings in the tool
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// In a real scenario, this would be more comprehensive.
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val gitignoreContent = """
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|/build/
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|/.gradle/
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|*.iml
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|.idea/
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|*~
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|out/
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""".trimMargin()
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Files.writeString(gitignoreFile, gitignoreContent)
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infoMsg("Successfully generated: $gitignoreFile")
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// 8. Add Gradle Wrapper
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val kscriptProjectRoot = Paths.get(".").toAbsolutePath().normalize()
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val gradlewFileInKscript = kscriptProjectRoot.resolve("gradlew")
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val gradlewBatFileInKscript = kscriptProjectRoot.resolve("gradlew.bat")
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val gradleWrapperDirInKscript = kscriptProjectRoot.resolve("gradle/wrapper")
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val gradlewFileInProject = outputDir.resolve("gradlew")
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val gradlewBatFileInProject = outputDir.resolve("gradlew.bat")
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val gradleWrapperDirInProject = outputDir.resolve("gradle/wrapper")
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if (Files.exists(gradlewFileInKscript)) {
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Files.copy(gradlewFileInKscript, gradlewFileInProject)
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gradlewFileInProject.toFile().setExecutable(true, false) // ownerOnly = false
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infoMsg("Copied gradlew and set executable.")
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} else {
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warnMsg("gradlew script not found in kscript project root, skipping copy.")
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}
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if (Files.exists(gradlewBatFileInKscript)) {
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Files.copy(gradlewBatFileInKscript, gradlewBatFileInProject)
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infoMsg("Copied gradlew.bat.")
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} else {
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warnMsg("gradlew.bat script not found in kscript project root, skipping copy.")
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}
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Files.createDirectories(gradleWrapperDirInProject)
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val wrapperJarInKscript = gradleWrapperDirInKscript.resolve("gradle-wrapper.jar")
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val wrapperPropsInKscript = gradleWrapperDirInKscript.resolve("gradle-wrapper.properties")
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if (Files.exists(wrapperJarInKscript)) {
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Files.copy(wrapperJarInKscript, gradleWrapperDirInProject.resolve("gradle-wrapper.jar"))
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infoMsg("Copied gradle-wrapper.jar.")
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} else {
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warnMsg("gradle-wrapper.jar not found in kscript project, skipping copy. Project will need 'gradle wrapper' task run manually.")
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}
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if (Files.exists(wrapperPropsInKscript)) {
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Files.copy(wrapperPropsInKscript, gradleWrapperDirInProject.resolve("gradle-wrapper.properties"))
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infoMsg("Copied gradle-wrapper.properties.")
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} else {
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warnMsg("gradle-wrapper.properties not found in kscript project, skipping copy. Project will need 'gradle wrapper' task run manually.")
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}
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infoMsg("Project generation for '$projectName' is complete.")
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} catch (e: Exception) {
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errorMsg("Error during project generation for $scriptFilePathString: ${e.message}")
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e.printStackTrace() // For more detailed debugging during development
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// Consider rethrowing or using a specific return type to indicate failure to the caller
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}
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}

‎src/main/kotlin/io/github/kscripting/kscript/util/OptionsUtils.kt‎

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.addOption("h", "help", false, "Prints help information")
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.addOption("v", "version", false, "Prints version information")
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.addOption("c", "clear-cache", false, "Wipes out cached script jars and urls")
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.addOption(null, "export-to-gradle-project", true, "Generate a Gradle project from <script> into <output_dir>.")
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}
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fun createHelpText(selfName: String, options: Options): String {

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