feat(workspace): add Gradle multi-project workspace discovery (#494)

Author: Strum355

src/index.js

@@ -8,6 +8,7 @@ import fs from 'node:fs'
 import { getCustom } from "./tools.js";
 import { resolveBatchMetadata, resolveContinueOnError } from './batch_opts.js'
 import { discoverMavenModules } from './providers/java_maven.js'
+import { discoverGradleSubprojects } from './providers/java_gradle.js'
 import {
 	discoverWorkspaceCrates,
 	discoverWorkspacePackages,
@@ -25,6 +26,7 @@ export { getProjectLicense, findLicenseFilePath, identifyLicense, getLicenseDeta
 export default { componentAnalysis, stackAnalysis, stackAnalysisBatch, imageAnalysis, validateToken, generateSbom }
 export {
 	discoverMavenModules,
+	discoverGradleSubprojects,
 	discoverWorkspacePackages,
 	discoverWorkspaceCrates,
 	validatePackageJson,
@@ -321,7 +323,7 @@ async function generateOneSbom(manifestPath, workspaceOpts) {
  *
  * @param {string} root - Resolved workspace root
  * @param {Options} opts
- * @returns {Promise<{ ecosystem: 'javascript' | 'cargo' | 'maven' | 'unknown', manifestPaths: string[] }>}
+ * @returns {Promise<{ ecosystem: 'javascript' | 'cargo' | 'maven' | 'gradle' | 'unknown', manifestPaths: string[] }>}
  * @private
  */
 async function detectWorkspaceManifests(root, opts) {
@@ -341,6 +343,15 @@ async function detectWorkspaceManifests(root, opts) {
 		}
 	}
 
+	const hasGradleSettings = fs.existsSync(path.join(root, 'settings.gradle'))
+		|| fs.existsSync(path.join(root, 'settings.gradle.kts'))
+	if (hasGradleSettings) {
+		const manifestPaths = await discoverGradleSubprojects(root, opts)
+		if (manifestPaths.length > 0) {
+			return { ecosystem: 'gradle', manifestPaths }
+		}
+	}
+
 	const hasJsLock = fs.existsSync(path.join(root, 'pnpm-lock.yaml'))
 		|| fs.existsSync(path.join(root, 'yarn.lock'))
 		|| fs.existsSync(path.join(root, 'package-lock.json'))

src/providers/java_gradle.js

@@ -1,11 +1,15 @@
+import crypto from 'node:crypto'
 import fs from 'node:fs'
+import os from 'node:os'
 import path from 'node:path'
 import { EOL } from 'os'
 
 import TOML from 'fast-toml'
 
 import { readLicenseFile } from '../license/license_utils.js'
 import Sbom from '../sbom.js'
+import { invokeCommand } from '../tools.js'
+import { filterManifestPathsByDiscoveryIgnore, resolveWorkspaceDiscoveryIgnore } from '../workspace.js'
 
 import Base_java, { ecosystem_gradle } from "./base_java.js";
 
@@ -466,3 +470,117 @@ export default class Java_gradle extends Base_java {
 		return undefined
 	}
 }
+
+const DEFAULT_GRADLE_DISCOVERY_IGNORE = [
+	'**/build/**',
+	'**/.gradle/**',
+]
+
+/** Gradle init script that emits structured project listing. */
+const GRADLE_INIT_SCRIPT = `allprojects {
+    task daListProjects {
+        doLast {
+            println "::DA_PROJECT::\${project.path}::\${project.projectDir}"
+        }
+    }
+}
+`
+
+/**
+ * Discover all build.gradle[.kts] manifest paths in a Gradle multi-project build.
+ * Uses a custom init script to get structured project listing.
+ *
+ * @param {string} workspaceRoot - Absolute or relative path to workspace root (must contain settings.gradle[.kts])
+ * @param {import('../index.js').Options} [opts={}]
+ * @returns {Promise<string[]>} Paths to build.gradle[.kts] files (absolute)
+ */
+export async function discoverGradleSubprojects(workspaceRoot, opts = {}) {
+	const root = path.resolve(workspaceRoot)
+	const hasSettings = fs.existsSync(path.join(root, 'settings.gradle'))
+		|| fs.existsSync(path.join(root, 'settings.gradle.kts'))
+
+	if (!hasSettings) {
+		return []
+	}
+
+	const manifestPaths = []
+
+	const rootBuildKts = path.join(root, 'build.gradle.kts')
+	const rootBuild = path.join(root, 'build.gradle')
+	const rootManifest = fs.existsSync(rootBuildKts) ? rootBuildKts : fs.existsSync(rootBuild) ? rootBuild : null
+	if (rootManifest) {
+		manifestPaths.push(rootManifest)
+	}
+
+	let gradleBin
+	try {
+		gradleBin = new Java_gradle().selectToolBinary(rootManifest || rootBuild, opts)
+	} catch {
+		const ignorePatterns = [...resolveWorkspaceDiscoveryIgnore(opts), ...DEFAULT_GRADLE_DISCOVERY_IGNORE]
+		return filterManifestPathsByDiscoveryIgnore(manifestPaths, root, ignorePatterns)
+	}
+
+	const initScriptPath = path.join(os.tmpdir(), `da-list-projects-${crypto.randomUUID()}.gradle`)
+	try {
+		fs.writeFileSync(initScriptPath, GRADLE_INIT_SCRIPT)
+		let output
+		try {
+			output = invokeCommand(gradleBin, [
+				'-q', '--no-daemon',
+				'--init-script', initScriptPath,
+				'daListProjects',
+			], { cwd: root })
+		} catch {
+			const ignorePatterns = [...resolveWorkspaceDiscoveryIgnore(opts), ...DEFAULT_GRADLE_DISCOVERY_IGNORE]
+			return filterManifestPathsByDiscoveryIgnore(manifestPaths, root, ignorePatterns)
+		}
+
+		const projects = parseGradleInitScriptOutput(output.toString())
+		for (const proj of projects) {
+			if (proj.path === ':') {
+				continue
+			}
+			const projDir = path.resolve(proj.dir)
+			const buildKts = path.join(projDir, 'build.gradle.kts')
+			const buildGroovy = path.join(projDir, 'build.gradle')
+			if (fs.existsSync(buildKts)) {
+				manifestPaths.push(buildKts)
+			} else if (fs.existsSync(buildGroovy)) {
+				manifestPaths.push(buildGroovy)
+			}
+		}
+	} finally {
+		try { fs.unlinkSync(initScriptPath) } catch { /* ignore */ }
+	}
+
+	const ignorePatterns = [...resolveWorkspaceDiscoveryIgnore(opts), ...DEFAULT_GRADLE_DISCOVERY_IGNORE]
+	return filterManifestPathsByDiscoveryIgnore(manifestPaths, root, ignorePatterns)
+}
+
+/**
+ * Parse the structured output from the Gradle init script.
+ *
+ * @param {string} raw - Raw stdout from gradle
+ * @returns {{ path: string, dir: string }[]}
+ */
+export function parseGradleInitScriptOutput(raw) {
+	const projects = []
+	for (const rawLine of raw.split('\n')) {
+		const line = rawLine.trimEnd()
+		if (!line.startsWith('::DA_PROJECT::')) {
+			continue
+		}
+		const prefix = '::DA_PROJECT::'
+		const remainder = line.substring(prefix.length)
+		const lastSep = remainder.lastIndexOf('::')
+		if (lastSep < 0) {
+			continue
+		}
+		const projPath = remainder.substring(0, lastSep)
+		const dir = remainder.substring(lastSep + 2)
+		if (projPath && dir) {
+			projects.push({ path: projPath, dir })
+		}
+	}
+	return projects
+}

src/tools.js

@@ -178,6 +178,25 @@ export function traverseForWrapper(startDir, wrapperName, repoRoot = undefined)
 	}
 }
 
+/**
+ * Resolve a build-tool binary, preferring a wrapper when configured.
+ *
+ * @param {string} globalBinary - Global binary name (e.g. `mvn`, `gradle`)
+ * @param {string} localWrapper - Wrapper filename (e.g. `mvnw`, `gradlew.bat`)
+ * @param {string} startDir - Directory from which to start the wrapper search
+ * @param {import('./index.js').Options} [opts={}]
+ * @returns {string} Path to the resolved binary
+ */
+export function resolveBinary(globalBinary, localWrapper, startDir, opts = {}) {
+	if (getWrapperPreference(globalBinary, opts)) {
+		const wrapper = traverseForWrapper(startDir, localWrapper)
+		if (wrapper !== undefined) {
+			return wrapper
+		}
+	}
+	return getCustomPath(globalBinary, opts)
+}
+
 /** this method invokes command string in a process in a synchronous way.
  * @param {string} bin - the command to be invoked
  * @param {Array<string>} args - the args to pass to the binary

test/providers/tst_manifests/gradle/gradle_mixed_variants/app/build.gradle

@@ -0,0 +1 @@
+// app build groovy

test/providers/tst_manifests/gradle/gradle_mixed_variants/build.gradle.kts

@@ -0,0 +1 @@
+// root build kts

test/providers/tst_manifests/gradle/gradle_mixed_variants/lib/build.gradle.kts

@@ -0,0 +1 @@
+// lib build kts

test/providers/tst_manifests/gradle/gradle_mixed_variants/settings.gradle.kts

@@ -0,0 +1 @@
+include(":app", ":lib")

test/providers/tst_manifests/gradle/gradle_multi_project/app/build.gradle

@@ -0,0 +1 @@
+// app build

test/providers/tst_manifests/gradle/gradle_multi_project/build.gradle

@@ -0,0 +1 @@
+// root build

test/providers/tst_manifests/gradle/gradle_multi_project/lib/build.gradle

@@ -0,0 +1 @@
+// lib build