Changeup: consilidate code, drop cache, change download

This changes up way too much:
- Moving most (all) of the code to main.ts instead of the numerous
  files
- Dropping the caching functionality, since it should be optional
- now we will only download the android sdk tools if they are not
  already present, including if ANDROID_SDK_ROOT is already set

src/main.ts

@@ -1,14 +1,71 @@
 import * as core from '@actions/core'
+import * as tc from '@actions/tool-cache'
+import * as exec from '@actions/exec'
 import * as path from 'path'
-import {ANDROID_SDK_ROOT, ANNOTATION_MATCHERS} from './constants'
-import {preGradleCache, preAndroidCache, preGradleWrapper} from './cache'
-import {install} from './install'
+import * as fs from 'fs'
+import * as os from 'os'
+
+const COMMANDLINE_TOOLS_VERSION = '6609375'
+const COMMANDLINE_TOOLS_WIN_URL = `https://dl.google.com/android/repository/commandlinetools-win-${COMMANDLINE_TOOLS_VERSION}_latest.zip`
+const COMMANDLINE_TOOLS_MAC_URL = `https://dl.google.com/android/repository/commandlinetools-mac-${COMMANDLINE_TOOLS_VERSION}_latest.zip`
+const COMMANDLINE_TOOLS_LIN_URL = `https://dl.google.com/android/repository/commandlinetools-linux-${COMMANDLINE_TOOLS_VERSION}_latest.zip`
+
+const HOME = os.homedir()
+const ANDROID_HOME_DIR = path.join(HOME, '.android')
+const ANDROID_HOME_SDK_DIR = path.join(ANDROID_HOME_DIR, 'sdk')
+const ANDROID_REPOSITORIES_CFG = path.join(ANDROID_HOME_DIR, 'repositories.cfg')
+
+async function install(): Promise<string> {
+  const ANDROID_SDK_ROOT =
+    process.env['ANDROID_SDK_ROOT'] || ANDROID_HOME_SDK_DIR
+  const licenseDir = path.join(ANDROID_SDK_ROOT, 'licenses')
+
+  // If the licences exist, the rest does too
+  if (fs.existsSync(licenseDir) && fs.existsSync(ANDROID_REPOSITORIES_CFG)) {
+    core.debug(`Skipping install, licenseDir found: ${licenseDir}`)
+    return ANDROID_SDK_ROOT
+  }
+
+  // create ~/.android/repositories.cfg
+  fs.mkdirSync(ANDROID_HOME_SDK_DIR, {recursive: true})
+  fs.closeSync(fs.openSync(ANDROID_REPOSITORIES_CFG, 'w'))
+
+  const acceptBuffer = Buffer.from(Array(10).fill('y').join('\n'), 'utf8')
+  let sdkManager = ''
+
+  if (process.platform === 'linux') {
+    const cmdlineToolsZip = await tc.downloadTool(COMMANDLINE_TOOLS_LIN_URL)
+    const cmdlineTools = await tc.extractZip(cmdlineToolsZip)
+    sdkManager = path.join(cmdlineTools, 'tools', 'bin', 'sdkmanager')
+  } else if (process.platform === 'darwin') {
+    const cmdlineToolsZip = await tc.downloadTool(COMMANDLINE_TOOLS_MAC_URL)
+    const cmdlineTools = await tc.extractZip(cmdlineToolsZip)
+    sdkManager = path.join(cmdlineTools, 'tools', 'bin', 'sdkmanager')
+  } else if (process.platform === 'win32') {
+    const cmdlineToolsZip = await tc.downloadTool(COMMANDLINE_TOOLS_WIN_URL)
+    const cmdlineTools = await tc.extractZip(cmdlineToolsZip)
+    sdkManager = path.join(cmdlineTools, 'tools', 'bin', 'sdkmanager.bat')
+  } else {
+    core.error(`Unsupported platform: ${process.platform}`)
+  }
+
+  await exec.exec(
+    sdkManager,
+    ['--licenses', `--sdk_root=${ANDROID_SDK_ROOT}`],
+    {input: acceptBuffer}
+  )
+
+  await exec.exec(
+    sdkManager,
+    ['--include_obsolete', `--sdk_root=${ANDROID_SDK_ROOT}`, 'tools'],
+    {input: acceptBuffer}
+  )
+
+  return ANDROID_SDK_ROOT
+}
 
 async function run(): Promise<void> {
-  // process all caching but wait for them to all complete
-  await Promise.all([preGradleWrapper(), preGradleCache(), preAndroidCache()])
-
-  await install()
+  const ANDROID_SDK_ROOT = await install()
 
   core.exportVariable('ANDROID_HOME', ANDROID_SDK_ROOT)
   core.exportVariable('ANDROID_SDK_ROOT', ANDROID_SDK_ROOT)
@@ -17,11 +74,8 @@ async function run(): Promise<void> {
   core.addPath(path.join(ANDROID_SDK_ROOT, 'platform-tools'))
 
   core.debug('add matchers')
-  const matchersPath = path.join(__dirname, '..', '..', '.github')
-  for (const matcher of ANNOTATION_MATCHERS) {
-    // eslint-disable-next-line no-console
-    console.log(`##[add-matcher]${path.join(matchersPath, matcher)}`)
-  }
+  // eslint-disable-next-line no-console
+  console.log(`##[add-matcher]${path.join(__dirname, '..', 'matchers.json')}`)
 }
 
 run()