feat: a script to update baselines

package.json

@@ -39,6 +39,7 @@
     "@types/fs-extra": "^8.0.1",
     "@types/get-stdin": "^5.0.1",
     "@types/mocha": "^5.2.5",
+    "@types/ncp": "^2.0.3",
     "@types/node": "^11.13.22",
     "@types/nunjucks": "^3.1.0",
     "@types/object-hash": "^1.3.0",
@@ -51,6 +52,7 @@
     "gts": "^1.0.0",
     "intelli-espower-loader": "^1.0.1",
     "mocha": "^6.2.1",
+    "ncp": "^2.0.0",
     "power-assert": "^1.6.0",
     "rimraf": "^3.0.0",
     "typescript": "~3.6.0"

typescript/tools/update-baselines.ts

@@ -0,0 +1,100 @@
+#!/usr/bin/env node
+
+// Copyright 2019 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// Updates baselines. Useful if many templates were changed and the changes
+// needs to be propagated to all baselines.
+// Usage: node build/tools/update-baselines.js
+
+import { exec } from 'child_process';
+import * as path from 'path';
+import * as rimraf from 'rimraf';
+import { promisify } from 'util';
+import { readdir, stat, mkdir, existsSync } from 'fs';
+import * as ncp from 'ncp';
+
+const rmrf = promisify(rimraf);
+const readdirp = promisify(readdir);
+const statp = promisify(stat);
+const mkdirp = promisify(mkdir);
+const execp = promisify(exec);
+const ncpp = promisify(ncp);
+
+const root = path.resolve(__dirname, '..', '..');
+const resultPrefix = /^\.test-out-(.*)$/;
+
+function getBaselineDirectory(library: string): string {
+  return path.join(root, 'typescript', 'test', 'testdata', library);
+}
+
+function getBaselineFilename(library: string, filename: string): string {
+  return path.join(getBaselineDirectory(library), `${filename}.baseline`);
+}
+
+async function copyBaseline(library: string, root: string, directory = '.') {
+  const start = path.join(root, directory);
+  const targetDirectory = path.join(getBaselineDirectory(library), directory);
+  if (!existsSync(targetDirectory)) {
+    await mkdirp(targetDirectory);
+  }
+  const files = await readdirp(start);
+  for (const file of files) {
+    const relativePath = `${directory}${path.sep}${file}`;
+    const absolutePath = path.join(start, file);
+    const stat = await statp(absolutePath);
+    if (stat.isDirectory()) {
+      await copyBaseline(library, root, relativePath);
+    } else if (stat.isFile()) {
+      const baseline = getBaselineFilename(library, relativePath);
+      await ncpp(absolutePath, baseline);
+      console.log(`    - ${relativePath}`);
+    }
+  }
+}
+
+async function main() {
+  // generate test output
+  try {
+    console.log(`Running npm test...`);
+    await execp('npm test');
+    console.log('Tests passed! No need to update baselines.');
+    return;
+  } catch (err) {
+    console.log(`Tests failed - that's OK, will update baselines.`);
+  }
+
+  // get a list of baselines
+  const files = await readdirp(root);
+  const outDirs = files.filter(file => file.match(resultPrefix));
+
+  // update baselines for all libraries
+  for (const dir of outDirs) {
+    const match = dir.match(resultPrefix);
+    if (!match) {
+      throw new Error(`Cannot extract library name from ${dir}`);
+    }
+    const library = match[1];
+    const baselineDir = getBaselineDirectory(library);
+
+    console.log(`Updating baseline for ${library}...`);
+    console.log(`  - rm -rf "${baselineDir}"...`);
+    await rmrf(baselineDir);
+    console.log(`  - copying files from ${dir}...`);
+    await copyBaseline(library, path.join(root, dir));
+    console.log('done!');
+  }
+}
+
+main().catch(console.error);