First attempt at find ruby action

src/find-ruby.ts

@@ -0,0 +1,53 @@
+import * as core from '@actions/core';
+import * as exec from '@actions/exec';
+import * as tc from '@actions/tool-cache';
+import * as os from 'os';
+import * as path from 'path';
+
+export enum Platform {
+  Windows,
+  MacOS,
+  Linux
+}
+
+export function getPlatform(): Platform {
+  switch (os.platform()) {
+    case 'win32':
+      return Platform.Windows;
+    case 'darwin':
+      return Platform.MacOS;
+    case 'linux':
+      return Platform.Linux;
+    default:
+      throw Error('Platform not recognized');
+  }
+}
+
+interface ActionInputs {
+  version: string;
+  addToPath: string;
+}
+
+export default async function(inputs: ActionInputs, platform: Platform) {
+  const installDir: string | null = tc.find('Ruby', inputs.version);
+
+  if (!installDir) {
+    throw new Error(`Version ${inputs.version} not found`);
+  }
+
+  const toolPath: string = path.join(installDir, 'bin');
+
+  if (platform !== Platform.Windows) {
+    // Ruby / Gem heavily use the '#!/usr/bin/ruby' to find ruby, so this task needs to
+    // replace that version of ruby so all the correct version of ruby gets selected
+    // replace the default
+    const dest: string = '/usr/bin/ruby';
+    exec.exec('sudo ln', ['-sf', path.join(toolPath, 'ruby'), dest]); // replace any existing
+  }
+
+  //core.setOutput('ruby-location', toolPath);
+
+  if (inputs.addToPath === 'true') {
+    core.addPath(toolPath);
+  }
+}

src/main.ts

@@ -1,8 +1,14 @@
 import * as core from '@actions/core';
+import findRubyVersion, {getPlatform} from './find-ruby';
 
 async function run() {
-  const myInput = core.getInput('myInput');
-  core.debug(`Hello ${myInput}`);
+  try {
+    const version = core.getInput('version');
+    const addToPath = core.getInput('add-to-path');
+    await findRubyVersion({version, addToPath}, getPlatform());
+  } catch (error) {
+    core.setFailed(error.message);
+  }
 }
 
 run();