Made utils for working with files

package-lock.json

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-      "integrity": "sha1-qIwCU1eR8C7TfHahueqXc8gz+MI=",
+      "integrity": "sha1-qIwCU1eR8C7TfHahueqXc8gz+MI="
-      "dev": true
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package.json

@@ -39,6 +39,7 @@
     "typescript": "^4.4.3"
   },
   "dependencies": {
-    "@actions/core": "^1.5.0"
+    "@actions/core": "^1.5.0",
+    "fast-glob": "^3.2.7"
   }
 }

src/utils/file-utils.ts

@@ -0,0 +1,76 @@
+import fs from "fs";
+import path from "path";
+import glob from "fast-glob";
+
+export class File {
+    public name: string;
+    public path: string;
+
+    public constructor(filePath: string) {
+        this.name = path.basename(filePath);
+        this.path = filePath;
+        Object.freeze(this);
+    }
+
+    public async getBuffer(): Promise<Buffer> {
+        return new Promise((resolve, reject) => {
+            fs.readFile(this.path, (error, data) => {
+                if (error) {
+                    reject(error);
+                } else {
+                    resolve(data);
+                }
+            })
+        });
+    }
+
+    public getStats(): Promise<fs.Stats> {
+        return new Promise((resolve, reject) => fs.stat(this.path, (error, stats) => {
+            if (error) {
+                reject(error);
+            } else {
+                resolve(stats);
+            }
+        }));
+    }
+
+    public equals(file: unknown): boolean {
+        return file instanceof File && file.path === this.path;
+    }
+}
+
+export async function getFiles(files: string | { primary?: string, secondary?: string }): Promise<File[]> {
+    if (!files || typeof files !== "string" && !files.primary && !files.secondary) {
+        return [];
+    }
+
+    if (typeof files === "string") {
+        return (await glob(files)).map(x => new File(x));
+    }
+
+    let results = [];
+    if (files.primary) {
+        results = (await glob(files.primary)).map(x => new File(x));
+    }
+    if (files.secondary) {
+        results = results.concat((await glob(files.secondary)).map(x => new File(x)));
+    }
+    return results.filter((x, i, self) => self.findIndex(y => x.equals(y)) === i);
+}
+
+export function parseVersionFromFilename(filename: string): string {
+    filename = path.parse(filename).name;
+    const match = filename.match(/[a-z]{0,2}\d+\.\d+.*/i);
+    return match ? match[0] : filename;
+}
+
+export function parseVersionTypeFromFilename(filename: string): "alpha" | "beta" | "release" {
+    filename = path.parse(filename).name;
+    if (filename.match(/[+-_]alpha/i)) {
+        return "alpha";
+    } else if (filename.match(/[+-_]beta/i)) {
+        return "beta";
+    } else {
+        return "release";
+    }
+}