From f29cef440f74a63fbab6566628aa2162f31d9e56 Mon Sep 17 00:00:00 2001
From: "Lillith Rose (Device: Lucia)" <lillithrosepup@gmail.com>
Date: Sat, 28 Jun 2025 14:44:05 -0400
Subject: [PATCH] initial commit

---
 action.yml   |  15 ++++++++
 index.js     | 103 +++++++++++++++++++++++++++++++++++++++++++++++++++
 package.json |  10 +++++
 3 files changed, 128 insertions(+)
 create mode 100644 action.yml
 create mode 100644 index.js
 create mode 100644 package.json

diff --git a/action.yml b/action.yml
new file mode 100644
index 0000000..75c4a56
--- /dev/null
+++ b/action.yml
@@ -0,0 +1,15 @@
+name: Create UnityPackage
+description: Create a .unitypackage from Unity project files with .meta files
+inputs:
+  projectDir:
+    description: Path to the root of your Unity project
+    required: true
+  filesDir:
+    description: Subfolder to pack (relative to projectDir)
+    required: true
+  output:
+    description: Output path for the .unitypackage file
+    required: true
+runs:
+  using: "node20"
+  main: "index.js"
diff --git a/index.js b/index.js
new file mode 100644
index 0000000..70b75f6
--- /dev/null
+++ b/index.js
@@ -0,0 +1,103 @@
+import {
+  mkdirSync,
+  mkdtempSync,
+  readdirSync,
+  createReadStream,
+  createWriteStream,
+  existsSync,
+} from "fs";
+import { copyFile, readFile, writeFile, rm } from "fs/promises";
+import { tmpdir } from "os";
+import { join } from "path";
+import * as tar from "tar-stream";
+import { createGzip } from "zlib";
+import { parse as yamlParse } from "yaml";
+
+const projectDir = process.env["INPUT_PROJECTDIR"];
+const filesDir = process.env["INPUT_FILESDIR"];
+const output = process.env["INPUT_OUTPUT"];
+
+if (!projectDir || !filesDir || !output) {
+  console.error("Missing required input(s).");
+  process.exit(1);
+}
+
+const tempdir = (name) => {
+  const dir = mkdtempSync(join(tmpdir(), name));
+  return dir;
+};
+
+const mkdir = (dir, recursive = false) => {
+  mkdirSync(dir, { recursive });
+  return dir;
+};
+
+const getMetaFiles = (root) => {
+  const recurse = (dir) => {
+    const entries = readdirSync(join(root, dir), { withFileTypes: true });
+    let files = [];
+    for (const entry of entries) {
+      const fullPath = join(dir, entry.name);
+      if (entry.isDirectory()) {
+        files = files.concat(recurse(fullPath));
+      } else if (entry.name.endsWith(".meta")) {
+        files.push(fullPath);
+      }
+    }
+    return files;
+  };
+  return recurse(".");
+};
+
+const createUnityPackage = async () => {
+  const metaFiles = getMetaFiles(join(projectDir, filesDir));
+  const tempDir = tempdir("unitypackage-create-");
+
+  for await (const metaFile of metaFiles) {
+    const assetPath = metaFile.replace(/\.meta$/, "");
+    const metaPath = join(projectDir, filesDir, metaFile);
+
+    const meta = yamlParse(await readFile(metaPath, "utf8"));
+    const guid = meta.guid;
+    if (!guid) continue;
+
+    const dir = mkdir(join(tempDir, guid), true);
+
+    const assetFullPath = join(projectDir, filesDir, assetPath);
+    if (!meta.folderAsset && existsSync(assetFullPath)) {
+      await copyFile(assetFullPath, join(dir, "asset"));
+    }
+    await copyFile(metaPath, join(dir, "asset.meta"));
+    await writeFile(join(dir, "pathname"), join(filesDir, assetPath));
+  }
+
+  const pack = tar.pack();
+  for (const guidDir of readdirSync(tempDir)) {
+    const entryDir = join(tempDir, guidDir);
+    for (const entry of readdirSync(entryDir)) {
+      const filePath = join(entryDir, entry);
+      const stream = createReadStream(filePath);
+      const buffer = await new Promise((resolve) => {
+        const chunks = [];
+        stream.on("data", (chunk) => chunks.push(chunk));
+        stream.on("end", () => resolve(Buffer.concat(chunks)));
+      });
+      pack.entry({ name: join(guidDir, entry), type: "file" }, buffer);
+    }
+  }
+
+  pack.finalize();
+
+  const writeStream = createWriteStream(output);
+  pack.pipe(createGzip()).pipe(writeStream);
+
+  await new Promise((resolve, reject) => {
+    writeStream.on("finish", resolve);
+    writeStream.on("error", reject);
+  });
+
+  await rm(tempDir, { recursive: true, force: true });
+  console.log(`UnityPackage created: ${output}`);
+};
+
+createUnityPackage();
diff --git a/package.json b/package.json
new file mode 100644
index 0000000..4fbf29e
--- /dev/null
+++ b/package.json
@@ -0,0 +1,10 @@
+{
+    "name": "create-unitypackage-action",
+    "type": "module",
+    "main": "index.js",
+    "dependencies": {
+      "tar-stream": "^3.1.7",
+      "yaml": "^2.3.4"
+    }
+  }
+  
\ No newline at end of file