Add support for Mandrel.

src/mandrel.ts

@@ -0,0 +1,57 @@
+import * as c from './constants'
+import {downloadAndExtractJDK, getLatestRelease} from './utils'
+
+const MANDREL_REPO = 'mandrel'
+const MANDREL_TAG_PREFIX = c.MANDREL_NAMESPACE
+const MANDREL_DL_BASE = 'https://github.com/graalvm/mandrel/releases/download'
+
+export async function setUpMandrel(
+  graalvmVersion: string,
+  javaVersion: string
+): Promise<string> {
+  const mandrelVersion = graalvmVersion.substring(
+    c.MANDREL_NAMESPACE.length,
+    graalvmVersion.length
+  )
+
+  let mandrelHome
+  switch (mandrelVersion) {
+    case 'latest':
+      mandrelHome = await setUpMandrelLatest(javaVersion)
+      break
+    default:
+      mandrelHome = await setUpMandrelRelease(mandrelVersion, javaVersion)
+      break
+  }
+
+  return mandrelHome
+}
+
+async function setUpMandrelLatest(javaVersion: string): Promise<string> {
+  const latestRelease = await getLatestRelease(MANDREL_REPO)
+  const tag_name = latestRelease.tag_name
+  if (tag_name.startsWith(MANDREL_TAG_PREFIX)) {
+    const latestVersion = tag_name.substring(
+      MANDREL_TAG_PREFIX.length,
+      tag_name.length
+    )
+    return setUpMandrelRelease(latestVersion, javaVersion)
+  }
+  throw new Error(`Could not find latest Mandrel release: ${tag_name}`)
+}
+
+async function setUpMandrelRelease(
+  version: string,
+  javaVersion: string
+): Promise<string> {
+  const identifier = determineMandrelIdentifier(version, javaVersion)
+  const downloadUrl = `${MANDREL_DL_BASE}/${MANDREL_TAG_PREFIX}${version}/${identifier}${c.GRAALVM_FILE_EXTENSION}`
+  return downloadAndExtractJDK(downloadUrl)
+}
+
+function determineMandrelIdentifier(
+  version: string,
+  javaVersion: string
+): string {
+  return `mandrel-java${javaVersion}-${c.GRAALVM_PLATFORM}-amd64-${version}`
+}