Extract temp dir function

Author: fwal

src/core/index.ts

@@ -2,3 +2,4 @@ export * from "./cmd";
 export * from "./gpg";
 export * from "./os";
 export * from "./compare-versions";
+export * from "./temp-dir";

src/core/temp-dir.ts

@@ -0,0 +1,12 @@
+import { mkdtempSync } from "fs";
+import { tmpdir } from "os";
+import { join } from "path";
+
+/**
+ * Crates a new temporary directory
+ * @param suffix Suffix to use for the temporary directory
+ * @returns Temporary directory
+ */
+export function tempDir(suffix: string = "swiftly-") {
+  return mkdtempSync(join(tmpdir(), suffix));
+}

src/swiftly/swiftly.ts

@@ -1,15 +1,14 @@
 import { addPath, debug, exportVariable, info } from "@actions/core";
-import { cmd } from "../core";
-import { existsSync, mkdtempSync } from "fs";
+import { cmd, tempDir } from "../core";
+import { existsSync } from "fs";
 import { join } from "path";
-import { tmpdir } from "os";
 
 async function swiftly(...args: string[]) {
   return await cmd("swiftly", ...args);
 }
 
 function setupPaths() {
-  const tmpPath = mkdtempSync(join(tmpdir(), "swiftly-"));
+  const tmpPath = tempDir();
 
   const homeDir = process.env.SWIFTLY_HOME_DIR || join(tmpPath, "home");
   const binDir = process.env.SWIFTLY_BIN_DIR || join(tmpPath, "bin");