download rtx

src/main.ts

@@ -1,16 +1,55 @@
 import * as core from '@actions/core'
 import * as exec from '@actions/exec'
 import * as fs from 'fs'
+import * as os from 'os'
+import * as path from 'path'
 
 async function run(): Promise<void> {
   await setupRTX()
   await setToolVersions()
   await exec.exec('rtx', ['--version'])
   await exec.exec('rtx', ['install'])
+  await setPaths()
+}
+
+interface GHAsset {
+  name: string
+  url: string
+  browser_download_url: string
+}
+
+interface GHAssets {
+  assets: GHAsset[]
+}
+
+async function getLatestRTXAssetURL(): Promise<string> {
+  const output = await exec.getExecOutput(
+    'curl',
+    ['-sSf', 'https://api.github.com/repos/jdxcode/rtx/releases/latest'],
+    {silent: true}
+  )
+  const json: GHAssets = JSON.parse(output.stdout)
+  const platform = `${getOS()}-${os.arch()}`
+  const asset = json.assets.find(a => a.name.endsWith(platform))
+  if (!asset) {
+    const assets = json.assets.map(a => a.name).join(', ')
+    throw new Error(`No asset for ${platform}, got: ${assets}`)
+  }
+  return asset.browser_download_url
 }
 
 async function setupRTX(): Promise<void> {
-  core.debug('Not implemented')
+  const rtxBinDir = path.join(os.homedir(), '.local/share/rtx/bin')
+  await fs.promises.mkdir(rtxBinDir, {recursive: true})
+  await exec.exec('curl', [
+    '-sSfL',
+    '--compressed',
+    '--output',
+    path.join(rtxBinDir, 'rtx'),
+    await getLatestRTXAssetURL()
+  ])
+  await exec.exec('chmod', ['+x', path.join(rtxBinDir, 'rtx')])
+  core.addPath(rtxBinDir)
 }
 
 async function setToolVersions(): Promise<void> {
@@ -22,6 +61,26 @@ async function setToolVersions(): Promise<void> {
   }
 }
 
+function getOS(): string {
+  switch (process.platform) {
+    case 'darwin':
+      return 'macos'
+    default:
+      return process.platform
+  }
+}
+
+async function setPaths(): Promise<void> {
+  for (const binPath of await getBinPaths()) {
+    core.addPath(binPath)
+  }
+}
+
+async function getBinPaths(): Promise<string[]> {
+  const output = await exec.getExecOutput('rtx', ['bin-paths'])
+  return output.stdout.split('\n')
+}
+
 if (require.main === module) {
   try {
     run()