New build infra

Build/download-previous-build.js

@@ -0,0 +1,46 @@
+const { fetch } = require('undici');
+const tar = require('tar');
+const fs = require('fs');
+const fse = require('fs-extra');
+const { join, resolve } = require('path');
+const { tmpdir } = require('os');
+const { Stream, Readable } = require('stream');
+const { promisify } = require('util');
+const pipeline = promisify(Stream.pipeline);
+
+(async () => {
+  const filesList = (
+    await fs.promises.readFile(resolve(__dirname, '../.gitignore'), { encoding: 'utf-8' })
+  )
+    .split('\n')
+    .filter(p => p.startsWith('List/'));
+
+  const tempFile = join(tmpdir(), `sukka-surge-last-build-tar-${Date.now()}`);
+  const resp = await fetch('https://codeload.github.com/sukkaw/surge/tar.gz/gh-pages');
+  const readableNodeStream = Readable.fromWeb(resp.body);
+  await pipeline(
+    readableNodeStream,
+    fs.createWriteStream(tempFile)
+  );
+
+  const extractedPath = join(tmpdir(), `sukka-surge-last-build-extracted-${Date.now()}`);
+  await fse.ensureDir(extractedPath);
+  await tar.x({
+    file: tempFile,
+    cwd: extractedPath,
+    filter: (p) => {
+      return p.split('/')[1] === 'List'
+    }
+  });
+
+  await Promise.all(filesList.map(p => fse.copy(
+    join(extractedPath, 'Surge-gh-pages', p),
+    join(__dirname, '..', p),
+    {
+      overwrite: true
+    }
+  )))
+
+  await fs.promises.unlink(tempFile).catch(() => {});
+  await fs.promises.unlink(extractedPath).catch(() => {});
+})();