Refactor action to typescript (#226)

* Refactor to typescript (config part)

* Refactor to typescript (convert extensions, minor fixes)

* Refactor to typescript (move from `action` to `dist`)

* Re-enable integrity-check for dist index.js

* Fix all tests and lints

* fix parsing major versions

* Test patch level to be digits only

* debug

* debug

* uncache

* manual compile

* debug

* debug

* Debug

* Build lib - doh

* remove diff check

* Make kubernetes workflow manual

* Properly generate 3 digit for simple major tags

* Remove ts-ignore

* re-enable cache

src/model/unity-versioning.ts

@@ -0,0 +1,33 @@
+import * as core from '@actions/core';
+import * as fs from 'fs';
+import path from 'path';
+
+export default class UnityVersioning {
+  static get versionPattern() {
+    return /20\d{2}\.\d\.\w{3,4}|3/;
+  }
+
+  static determineUnityVersion(projectPath, unityVersion) {
+    if (unityVersion === 'auto') {
+      return UnityVersioning.read(projectPath);
+    }
+    return unityVersion;
+  }
+
+  static read(projectPath) {
+    const filePath = path.join(projectPath, 'ProjectSettings', 'ProjectVersion.txt');
+    if (!fs.existsSync(filePath)) {
+      core.warning(`Could not find "${filePath}", keeping unityVersion as "auto"`);
+      return 'auto';
+    }
+    return UnityVersioning.parse(fs.readFileSync(filePath, 'utf8'));
+  }
+
+  static parse(projectVersionTxt) {
+    const matches = projectVersionTxt.match(UnityVersioning.versionPattern);
+    if (!matches || matches.length === 0) {
+      throw new Error(`Failed to parse version from "${projectVersionTxt}".`);
+    }
+    return matches[0];
+  }
+}