From 1ea4ad4e309f0d262c548e66852c3e8a428ffe2a Mon Sep 17 00:00:00 2001
From: Lucas Azzola <derflatulator@gmail.com>
Date: Sun, 14 May 2017 20:26:37 +1000
Subject: [PATCH] tools(typescript): add script to run all TypeScript tests
 (#1606)

---
 .gitignore                               |   3 +-
 bin/prettier.js                          |  19 +++--
 scripts/run-external-typescript-tests.js | 102 +++++++++++++++++++++++
 3 files changed, 114 insertions(+), 10 deletions(-)
 create mode 100644 scripts/run-external-typescript-tests.js

diff --git a/.gitignore b/.gitignore
index 2908a6b29..8a7c4c92a 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,4 +1,5 @@
 node_modules
 npm-debug.log
+/errors
 /test.js
-/.vscode
\ No newline at end of file
+/.vscode
diff --git a/bin/prettier.js b/bin/prettier.js
index 7dc0d7d46..28ccee97d 100755
--- a/bin/prettier.js
+++ b/bin/prettier.js
@@ -153,20 +153,21 @@ function format(input) {
     const pp = prettier.format(input, options);
     const pppp = prettier.format(pp, options);
     if (pp !== pppp) {
-      process.stdout.write("\n");
-      console.error('prettier(input) !== prettier(prettier(input))');
-      console.error(diff(pp, pppp));
-      process.exitCode = 2;
+      throw "prettier(input) !== prettier(prettier(input))\n" + diff(pp, pppp);
     } else {
       const ast = cleanAST(prettier.__debug.parse(input, options));
       const past = cleanAST(prettier.__debug.parse(pp, options));
 
       if (ast !== past) {
-        process.stdout.write("\n");
-        console.error('ast(input) !== ast(prettier(input))');
-        console.error(diff(ast, past));
-        console.error(diff(input, pp));
-        process.exitCode = 2;
+        const MAX_AST_SIZE = 2097152; // 2MB
+        const astDiff = (ast.length > MAX_AST_SIZE || past.length > MAX_AST_SIZE)
+          ? "AST diff too large to render"
+          : diff(ast, past);
+        throw (
+          "ast(input) !== ast(prettier(input))\n" +
+          astDiff + "\n" +
+          diff(input, pp)
+        );
       }
     }
     return;
diff --git a/scripts/run-external-typescript-tests.js b/scripts/run-external-typescript-tests.js
new file mode 100644
index 000000000..4a1d24804
--- /dev/null
+++ b/scripts/run-external-typescript-tests.js
@@ -0,0 +1,102 @@
+const fs = require("fs");
+const path = require("path");
+const spawn = require("child_process").spawn;
+const rimraf = require("rimraf");
+
+const tsRoot = path.resolve(__dirname, "../../TypeScript");
+const packageJson = path.resolve(tsRoot, "package.json");
+const testsDir = path.relative(process.cwd(), path.join(tsRoot, "tests"));
+const errorsPath = "./errors/";
+const fileGlob = path.join(testsDir, "**/*.ts");
+
+if (!fs.existsSync(tsRoot) || !fs.existsSync(testsDir)) {
+  console.error(`Error: TypeScript is not cloned at ../TypeScript`);
+  process.exit(1);
+}
+
+const badFiles = [];
+const errorTypes = {};
+let good = 0;
+
+const cp = spawn("node", [
+  "./bin/prettier.js",
+  "--parser",
+  "typescript",
+  "--debug-check",
+  fileGlob
+]);
+
+cp.stdout.on("data", out => {
+  good++;
+  printStatus();
+});
+cp.stderr.on("data", err => {
+  const error = err.toString();
+  const { file, errorType } = splitFileAndError(error);
+  badFiles.push({ file, errorType, error });
+  errorTypes[errorType] = (errorTypes[errorType] || 0) + 1;
+  printStatus();
+});
+
+cp.on("close", code => {
+  const total = badFiles.length + good;
+  console.log(`\n${good}/${total} files printed without errors.`);
+  console.log("");
+  Object.keys(errorTypes)
+    .sort((a, b) => errorTypes[b] - errorTypes[a])
+    .forEach(errorType => {
+      console.log(`${errorTypes[errorType]}\t${errorType}`);
+    });
+
+  console.log(`Writing errors to '${errorsPath}' directory`);
+  writeErrorsToFiles();
+});
+
+function printStatus() {
+  process.stdout.write(`\r${good} good, ${badFiles.length} bad`);
+}
+
+function splitFileAndError(err) {
+  const lines = err.split("\n");
+  const [file, ...rest] = lines[0].split(":");
+  if (rest.length) {
+    return {
+      file,
+      errorType: rest
+        .join(":")
+        .replace(/\(\d+:\d+\)/, "")
+        .replace(/(Comment )".*"/, '$1"<omitted>"')
+        .trim()
+    };
+  } else {
+    console.error("Could not process error:", err);
+    return {
+      file: "?",
+      errorType: err
+    };
+  }
+}
+
+function writeErrorsToFiles() {
+  const splitter = "@".repeat(80);
+  rimraf.sync(errorsPath);
+  fs.mkdirSync(errorsPath);
+  Object.keys(errorTypes).forEach(errorType => {
+    const files = badFiles.filter(f => f.errorType === errorType);
+    const contents = files.map(({ file, error }) => {
+      // Trim file name from error.
+      if (error.startsWith(file)) {
+        error = error.substring(file.length);
+      }
+      return `\n\n${file}\n${error}\n${splitter}\n`;
+    }).join("\n");
+    fs.writeFileSync(
+      path.join(errorsPath, sanitize(errorType) + ".log"),
+      contents
+    );
+  });
+}
+
+function sanitize(string) {
+  return string.replace(/[^A-Z0-9_.\-]/gi, "_");
+}