Expand TILDE (~) in path inputs (#160)

Closes: #159

src/hash/hash-files.ts

@@ -0,0 +1,48 @@
+import * as crypto from "node:crypto";
+import * as core from "@actions/core";
+import * as fs from "node:fs";
+import * as stream from "node:stream";
+import * as util from "node:util";
+import { create } from "@actions/glob";
+
+/**
+ * Hashes files matching the given glob pattern.
+ *
+ * Copied from https://github.com/actions/toolkit/blob/20ed2908f19538e9dfb66d8083f1171c0a50a87c/packages/glob/src/internal-hash-files.ts#L9-L49
+ * But supports hashing files outside the GITHUB_WORKSPACE.
+ * @param pattern The glob pattern to match files.
+ * @param verbose Whether to log the files being hashed.
+ */
+export async function hashFiles(
+  pattern: string,
+  verbose = false,
+): Promise<string> {
+  const globber = await create(pattern);
+  let hasMatch = false;
+  const writeDelegate = verbose ? core.info : core.debug;
+  const result = crypto.createHash("sha256");
+  let count = 0;
+  for await (const file of globber.globGenerator()) {
+    writeDelegate(file);
+    if (fs.statSync(file).isDirectory()) {
+      writeDelegate(`Skip directory '${file}'.`);
+      continue;
+    }
+    const hash = crypto.createHash("sha256");
+    const pipeline = util.promisify(stream.pipeline);
+    await pipeline(fs.createReadStream(file), hash);
+    result.write(hash.digest());
+    count++;
+    if (!hasMatch) {
+      hasMatch = true;
+    }
+  }
+  result.end();
+
+  if (hasMatch) {
+    writeDelegate(`Found ${count} files to hash.`);
+    return result.digest("hex");
+  }
+  writeDelegate("No matches found for glob");
+  return "";
+}