Move execution-related code into subpackage

sources/src/execution/gradle.ts

@@ -0,0 +1,42 @@
+import * as core from '@actions/core'
+import * as exec from '@actions/exec'
+import * as path from 'path'
+
+import * as params from '../input-params'
+import * as provisioner from './provision'
+import * as gradlew from './gradlew'
+import {getWorkspaceDirectory} from '../input-params'
+
+export async function provisionAndMaybeExecute(args: string[]): Promise<void> {
+    // Download and install Gradle if required
+    const executable = await provisioner.provisionGradle()
+
+    // Only execute if arguments have been provided
+    if (args.length > 0) {
+        await executeGradleBuild(executable, buildRootDirectory(), args)
+    }
+}
+
+async function executeGradleBuild(executable: string | undefined, root: string, args: string[]): Promise<void> {
+    // Use the provided executable, or look for a Gradle wrapper script to run
+    const toExecute = executable ?? gradlew.gradleWrapperScript(root)
+
+    const status: number = await exec.exec(toExecute, args, {
+        cwd: root,
+        ignoreReturnCode: true
+    })
+
+    if (status !== 0) {
+        core.setFailed(`Gradle build failed: see console output for details`)
+    }
+}
+
+function buildRootDirectory(): string {
+    const baseDirectory = getWorkspaceDirectory()
+    const buildRootDirectoryInput = params.getBuildRootDirectory()
+    const resolvedBuildRootDirectory =
+        buildRootDirectoryInput === ''
+            ? path.resolve(baseDirectory)
+            : path.resolve(baseDirectory, buildRootDirectoryInput)
+    return resolvedBuildRootDirectory
+}