feat(seed): "unpack" and "repack" scripts

add "npm run seed" as alias to "node seed"

unpack tests and solution into HTML file; add titles and help text; style unpacked file

enable running unpacked assert tests in browser

Using browserify, compile "tape", "lodash", jQuery into "unpacked-bundle.js" for use during in-browser unpacked tests

feat(seed): diff after repacking

feat(seed): unpacked tests use Browser TAP chrome dev tool if available

README.md

@@ -10,8 +10,17 @@ For each challenge section, there is a JSON file (fields documented below) conta
 |---|---|
 | `npm run test-challenges` | run all challenge tests (for each challenge JSON file, run all `tests` against all `solutions`) |
 | `npm run test` |  run all JS tests in the system, including client, server, lint and challenge tests |
-| `node seed` | parses all the challenge JSON files and saves them into MongoDB (code is inside [index.js](index.js)) |
+| `npm run seed` <br>&nbsp;&nbsp;(<small>or</small> `node seed`) | parses all the challenge JSON files and saves them into MongoDB (code is inside [index.js](index.js)) |
 | `npm run commit` | interactive tool to help you build a good commit message |
+| `npm run unpack` | extract challenges from `seed/challenges` into `unpacked` subdirectory, one HTML page per challenge |
+| `npm run repack` | repack challenges from `unpacked` subdirectory into `seed/challenges` |
+
+### unpack and repack
+
+`npm run unpack` extracts challenges into separate files for easier viewing and editing. The files are `.gitignore`d and will *not* be checked in, and all mongo seed importing will keep using the existing system; this is essentially a tool for editing `challenge.json` files. These HTML files are self-contained and run their own tests -- open a browser JS console to see the test results.
+
+`npm run repack` gathers up the unpacked/edited HTML files into challenge-block JSON files. Use `git diff` to see the changes
+
 
 ## Links
 
@@ -24,7 +33,7 @@ For each challenge section, there is a JSON file (fields documented below) conta
 
 ## Challenge Template
 
-```json
+```
 {
   "id": "unique identifier (alphanumerical, mongodb id)",
   "title": "Challenge Title",

addAssertsToTapTest.js

@@ -0,0 +1,52 @@
+let _ = require('lodash');
+
+function createIsAssert(tapTest, isThing) {
+  const { assert } = tapTest;
+  return function() {
+    const args = [...arguments];
+    args[0] = isThing(args[0]);
+    assert.apply(tapTest, args);
+  };
+}
+
+function addAssertsToTapTest(tapTest) {
+  const assert = tapTest.assert;
+
+  assert.isArray = createIsAssert(tapTest, _.isArray);
+  assert.isBoolean = createIsAssert(tapTest, _.isBoolean);
+  assert.isString = createIsAssert(tapTest, _.isString);
+  assert.isNumber = createIsAssert(tapTest, _.isNumber);
+  assert.isUndefined = createIsAssert(tapTest, _.isUndefined);
+
+  assert.deepEqual = tapTest.deepEqual;
+  assert.equal = tapTest.equal;
+  assert.strictEqual = tapTest.equal;
+  assert.sameMembers = function sameMembers() {
+    const [ first, second, ...args] = arguments;
+    assert.apply(
+      tapTest,
+      [
+        _.difference(first, second).length === 0 &&
+        _.difference(second, first).length === 0
+      ].concat(args)
+    );
+  };
+  assert.includeMembers = function includeMembers() {
+    const [ first, second, ...args] = arguments;
+    assert.apply(tapTest,
+      [
+        _.difference(second, first).length === 0
+      ].concat(args));
+  };
+  assert.match = function match() {
+    const [value, regex, ...args] = arguments;
+    assert.apply(tapTest,
+      [
+        regex.test(value)
+      ].concat(args));
+  };
+
+  return assert;
+}
+
+module.exports = addAssertsToTapTest;

getChallenges.js

@@ -4,64 +4,54 @@ const fs = require('fs');
 const path = require('path');
 
 const hiddenFile = /(^(\.|\/\.))|(.md$)/g;
+
 function getFilesFor(dir) {
-  return fs.readdirSync(path.join(__dirname, '/' + dir))
+  let targetDir = path.join(__dirname, dir);
+  return fs.readdirSync(targetDir)
     .filter(file => !hiddenFile.test(file))
     .map(function(file) {
       let superBlock;
-      if (fs.statSync(path.join(__dirname, dir + '/' + file)).isFile()) {
-        return { file: file };
+      if (fs.statSync(path.join(targetDir, file)).isFile()) {
+        return {file: file};
       }
       superBlock = file;
-      return getFilesFor(dir + '/' + superBlock)
+      return getFilesFor(path.join(dir, superBlock))
         .map(function(data) {
           return {
-            file: superBlock + '/' + data.file,
+            file: path.join(superBlock, data.file),
             superBlock: superBlock
           };
         });
     })
-    .reduce(function(files, file) {
-      if (!Array.isArray(file)) {
-        files.push(file);
-        return files;
-      }
-      return files.concat(file);
+    .reduce(function(files, entry) {
+      return files.concat(entry);
     }, []);
 }
 
-function getSupOrder(filePath) {
-  const order = parseInt((filePath || '').split('-')[0], 10);
-  // check for NaN
-  if (order !== order) {
-    return 0;
+function superblockInfo(filePath) {
+  let parts = (filePath || '').split('-');
+  let order = parseInt(parts[0], 10);
+  if (isNaN(order)) {
+    return {order: 0, name: filePath};
+  } else {
+    return {
+      order: order,
+      name: parts.splice(1).join('-')
+    };
   }
-  return order;
 }
 
-function getSupName(filePath) {
-  const order = parseInt((filePath || '').split('-')[0], 10);
-  // check for NaN
-  if (order !== order) {
-    return filePath;
-  }
-
-  return (filePath || '').split('-').splice(1).join('-');
-}
-
-module.exports = function getChallenges() {
-  try {
-    return getFilesFor('challenges')
-      .map(function(data) {
-        const challengeSpec = require('./challenges/' + data.file);
-        challengeSpec.fileName = data.file;
-        challengeSpec.superBlock = getSupName(data.superBlock);
-        challengeSpec.superOrder = getSupOrder(data.superBlock);
-
-        return challengeSpec;
-      });
-  } catch (e) {
-    console.error('error: ', e);
-    return [];
+module.exports = function getChallenges(challengesDir) {
+  if (!challengesDir) {
+    challengesDir = 'challenges';
   }
+  return getFilesFor(challengesDir)
+    .map(function(data) {
+      const challengeSpec = require('./' + challengesDir + '/' + data.file);
+      let superInfo = superblockInfo(data.superBlock);
+      challengeSpec.fileName = data.file;
+      challengeSpec.superBlock = superInfo.name;
+      challengeSpec.superOrder = superInfo.order;
+      return challengeSpec;
+    });
 };

mongoIds.js

@@ -0,0 +1,24 @@
+import _ from 'lodash';
+import { isMongoId } from 'validator';
+
+class MongoIds {
+  constructor() {
+    this.knownIds = [];
+  }
+  check(id, title) {
+    if (!isMongoId(id)) {
+      throw new Error(`Expected a valid ObjectId for ${title}, but got ${id}`);
+    }
+    const idIndex = _.findIndex(this.knownIds, existing => id === existing);
+    if (idIndex !== -1) {
+      throw new Error(`
+    All challenges must have a unique id.
+
+    The id for ${title} is already assigned
+    `);
+    }
+    this.knownIds = [ ...this.knownIds, id ];
+  }
+}
+
+export default MongoIds;

normalize-seed-files.js

@@ -52,16 +52,16 @@ function createNewTranslations(challenge) {
         newTranslation = {};
         newTranslation[matches[1]] = challenge[oldKey];
         translations[tag] = translations[tag] ?
-          Object.assign({}, translations[tag], newTranslation) :
-          Object.assign({}, newTranslation);
+          ({...translations[tag], ...newTranslation}) :
+          ({...newTranslation});
         return translations;
       }
       matches = oldKey.match(oldNameRegex);
       tag = normalizeLangTag(matches[1]);
       newTranslation = { title: challenge[oldKey] };
       translations[tag] = translations[tag] ?
-        Object.assign({}, translations[tag], newTranslation) :
-        Object.assign({}, newTranslation);
+        ({...translations[tag], ...newTranslation}) :
+        ({...newTranslation});
       return translations;
     }, {});
 }
@@ -71,11 +71,10 @@ function normalizeChallenge(challenge) {
   challenge.translations = challenge.translations || {};
   var hasOldTranslations = keys.some(hasOldTranslation);
   if (hasOldTranslations) {
-    challenge.translations = Object.assign(
-      {},
-      challenge.translations,
-      createNewTranslations(challenge)
-    );
+    challenge.translations = ({
+      ...challenge.translations,
+      ...createNewTranslations(challenge)
+    });
   }
   challenge.translations = sortTranslationsKeys(challenge.translations);
   // remove old translations from the top level

repack.js

@@ -0,0 +1,76 @@
+/* eslint-disable no-eval, no-process-exit */
+import fs from 'fs-extra';
+import path from 'path';
+import {UnpackedChallenge, ChallengeFile} from './unpackedChallenge';
+
+const jsdiff = require('diff');
+
+// Repack all challenges from all
+// seed/unpacked/00-foo/bar/000-id.html files
+// into
+// seed/challenges/00-foo/bar.json files
+
+let unpackedRoot = path.join(__dirname, 'unpacked');
+let seedChallengesRoot = path.join(__dirname, 'challenges');
+
+function directoriesIn(parentDir) {
+  return fs.readdirSync(parentDir)
+    .filter(entry => fs.statSync(path.join(parentDir, entry)).isDirectory());
+}
+
+let superBlocks = directoriesIn(unpackedRoot);
+console.log(superBlocks);
+
+function diffFiles(originalFilePath, changedFilePath) {
+  // todo: async
+  console.log(`diffing ${originalFilePath} and ${changedFilePath}`);
+  let original = fs.readFileSync(originalFilePath).toString();
+  let repacked = fs.readFileSync(changedFilePath).toString();
+
+  let changes = jsdiff.diffLines(original, repacked, { newlineIsToken: true });
+  changes.forEach((change) => {
+    if (change.added || change.removed) {
+      console.log(JSON.stringify(change, null, 2));
+    }
+  });
+  console.log('');
+}
+
+superBlocks.forEach(superBlock => {
+  let superBlockPath = path.join(unpackedRoot, superBlock);
+  let blocks = directoriesIn(superBlockPath);
+  blocks.forEach(blockName => {
+    let blockPath = path.join(superBlockPath, blockName);
+    let blockFilePath = path.join(blockPath, blockName + '.json');
+    let block = require(blockFilePath);
+    let index = 0;
+    block.challenges.forEach(challengeJson => {
+      let unpackedChallenge =
+        new UnpackedChallenge(blockPath, challengeJson, index);
+      let unpackedFile = unpackedChallenge.challengeFile();
+      let chunks = unpackedFile.readChunks();
+
+      Object.assign(block.challenges[ index ], chunks);
+
+      index += 1;
+    });
+
+    let outputFilePath =
+      path.join(seedChallengesRoot, superBlock, blockName + '.json');
+    // todo: async
+    fs.writeFileSync(outputFilePath, JSON.stringify(block, null, 2));
+
+    // todo: make this a command-line option instead
+    let doDiff = false;
+    if (doDiff) {
+      diffFiles(blockFilePath, outputFilePath);
+    }
+
+  });
+
+});
+
+// let challenges = getChallenges();
+// challenges.forEach(challengeBlock => {
+//   console.log()
+// });

test-challenges.js

@@ -1,76 +1,106 @@
-/* eslint-disable no-eval, no-process-exit */
-import _ from 'lodash';
-import { Observable } from 'rx';
+/* eslint-disable no-eval, no-process-exit, no-unused-vars */
+
+import {Observable} from 'rx';
 import tape from 'tape';
-import { isMongoId } from 'validator';
 
 import getChallenges from './getChallenges';
 import { modern } from '../common/app/utils/challengeTypes';
+import MongoIds from './mongoIds';
+import addAssertsToTapTest from './addAssertsToTapTest';
 
-const notMongoId = id => !isMongoId(id);
+let mongoIds = new MongoIds();
 
-let existingIds = [];
+function evaluateTest(solution, assert,
+  react, redux, reactRedux,
+  head, tail,
+  test, tapTest) {
+
+  let code = solution;
+
+  /* NOTE: Provide dependencies for React/Redux challenges
+               * and configure testing environment
+               */
+  let React,
+    ReactDOM,
+    Redux,
+    ReduxThunk,
+    ReactRedux,
+    Enzyme,
+    document;
+
+  // Fake Deep Equal dependency
+  const DeepEqual = (a, b) =>
+    JSON.stringify(a) === JSON.stringify(b);
+
+  // Hardcode Deep Freeze dependency
+  const DeepFreeze = (o) => {
+    Object.freeze(o);
+    Object.getOwnPropertyNames(o).forEach(function(prop) {
+      if (o.hasOwnProperty(prop)
+        && o[ prop ] !== null
+        && (
+          typeof o[ prop ] === 'object' ||
+          typeof o[ prop ] === 'function'
+        )
+        && !Object.isFrozen(o[ prop ])) {
+        DeepFreeze(o[ prop ]);
+      }
+    });
+    return o;
+  };
+
+  if (react || redux || reactRedux) {
+    // Provide dependencies, just provide all of them
+    React = require('react');
+    ReactDOM = require('react-dom');
+    Redux = require('redux');
+    ReduxThunk = require('redux-thunk');
+    ReactRedux = require('react-redux');
+    Enzyme = require('enzyme');
+    const Adapter15 = require('enzyme-adapter-react-15');
+    Enzyme.configure({ adapter: new Adapter15() });
+
+    /* Transpile ALL the code
+                 * (we may use JSX in head or tail or tests, too): */
+    const transform = require('babel-standalone').transform;
+    const options = { presets: [ 'es2015', 'react' ] };
+
+    head = transform(head, options).code;
+    solution = transform(solution, options).code;
+    tail = transform(tail, options).code;
+    test = transform(test, options).code;
+
+    const { JSDOM } = require('jsdom');
+    // Mock DOM document for ReactDOM.render method
+    const jsdom = new JSDOM(`<!doctype html>
+                  <html>
+                    <body>
+                      <div id="challenge-node"></div>
+                    </body>
+                  </html>
+                `);
+    const { window } = jsdom;
+
+    // Mock DOM for ReactDOM tests
+    document = window.document;
+    global.window = window;
+    global.document = window.document;
 
-function validateObjectId(id, title) {
-  if (notMongoId(id)) {
-    throw new Error(`Expected a vaild ObjectId for ${title}, got ${id}`);
   }
-  const idIndex = _.findIndex(existingIds, existing => id === existing);
-  if (idIndex !== -1) {
-    throw new Error(`
-    All challenges must have a unique id.
 
-    The id for ${title} is already assigned
-    `);
+  /* eslint-enable no-unused-vars */
+  try {
+    (() => {
+      return eval(
+        head + '\n;;' +
+        solution + '\n;;' +
+        tail + '\n;;' +
+        test
+      );
+    })();
+  } catch (e) {
+    tapTest.fail(e);
   }
-  existingIds = [ ...existingIds, id ];
-  return;
-}
-
-function createIsAssert(t, isThing) {
-  const { assert } = t;
-  return function() {
-    const args = [...arguments];
-    args[0] = isThing(args[0]);
-    assert.apply(t, args);
-  };
-}
-
-function fillAssert(t) {
-  const assert = t.assert;
-
-  assert.isArray = createIsAssert(t, _.isArray);
-  assert.isBoolean = createIsAssert(t, _.isBoolean);
-  assert.isString = createIsAssert(t, _.isString);
-  assert.isNumber = createIsAssert(t, _.isNumber);
-  assert.isUndefined = createIsAssert(t, _.isUndefined);
-
-  assert.deepEqual = t.deepEqual;
-  assert.equal = t.equal;
-  assert.strictEqual = t.equal;
-
-  assert.sameMembers = function sameMembers() {
-    const [ first, second, ...args] = arguments;
-    assert.apply(
-      t,
-      [
-        _.difference(first, second).length === 0 &&
-        _.difference(second, first).length === 0
-      ].concat(args)
-    );
-  };
-
-  assert.includeMembers = function includeMembers() {
-    const [ first, second, ...args] = arguments;
-    assert.apply(t, [_.difference(second, first).length === 0].concat(args));
-  };
-
-  assert.match = function match() {
-    const [value, regex, ...args] = arguments;
-    assert.apply(t, [regex.test(value)].concat(args));
-  };
-
-  return assert;
 }
 
 function createTest({
@@ -84,7 +114,8 @@ function createTest({
   redux = false,
   reactRedux = false
 }) {
-  validateObjectId(id, title);
+  mongoIds.check(id, title);
+
   solutions = solutions.filter(solution => !!solution);
   tests = tests.filter(test => !!test);
 
@@ -92,7 +123,10 @@ function createTest({
   const isAsync = s => s.includes('(async () => ');
   if (isAsync(tests.join(''))) {
     console.log(`Replacing Async Tests for Challenge ${title}`);
-    tests = tests.map(t => isAsync(t) ? "assert(true, 'message: great');" : t);
+    tests = tests.map(challengeTestSource =>
+      isAsync(challengeTestSource) ?
+        "assert(true, 'message: great');" :
+        challengeTestSource);
   }
 
   head = head.join('\n');
@@ -106,116 +140,26 @@ function createTest({
   }
 
   return Observable.fromCallback(tape)(title)
-    .doOnNext(t => solutions.length ? t.plan(plan) : t.end())
-    .flatMap(t => {
+    .doOnNext(tapTest =>
+      solutions.length ? tapTest.plan(plan) : tapTest.end())
+    .flatMap(tapTest => {
       if (solutions.length <= 0) {
-        t.comment('No solutions for ' + title);
+        tapTest.comment('No solutions for ' + title);
         return Observable.just({
           title,
           type: 'missing'
         });
       }
 
-      return Observable.just(t)
-        .map(fillAssert)
+      return Observable.just(tapTest)
+        .map(addAssertsToTapTest)
         /* eslint-disable no-unused-vars */
         // assert and code used within the eval
         .doOnNext(assert => {
           solutions.forEach(solution => {
-            // Original code string
-            const originalCode = solution;
             tests.forEach(test => {
-              let code = solution;
-
-              /* NOTE: Provide dependencies for React/Redux challenges
-               * and configure testing environment
-               */
-
-              let React,
-                  ReactDOM,
-                  Redux,
-                  ReduxThunk,
-                  ReactRedux,
-                  Enzyme,
-                  document;
-
-              // Fake Deep Equal dependency
-              const DeepEqual = (a, b) =>
-                JSON.stringify(a) === JSON.stringify(b);
-
-              // Hardcode Deep Freeze dependency
-              const DeepFreeze = (o) => {
-                Object.freeze(o);
-                Object.getOwnPropertyNames(o).forEach(function(prop) {
-                  if (o.hasOwnProperty(prop)
-                  && o[prop] !== null
-                  && (
-                    typeof o[prop] === 'object' ||
-                    typeof o[prop] === 'function'
-                  )
-                  && !Object.isFrozen(o[prop])) {
-                    DeepFreeze(o[prop]);
-                  }
-                });
-                return o;
-              };
-
-              if (react || redux || reactRedux) {
-                // Provide dependencies, just provide all of them
-                React = require('react');
-                ReactDOM = require('react-dom');
-                Redux = require('redux');
-                ReduxThunk = require('redux-thunk');
-                ReactRedux = require('react-redux');
-                Enzyme = require('enzyme');
-                const Adapter15 = require('enzyme-adapter-react-15');
-                Enzyme.configure({ adapter: new Adapter15() });
-
-                /* Transpile ALL the code
-                 * (we may use JSX in head or tail or tests, too): */
-                const transform = require('babel-standalone').transform;
-                const options = { presets: [ 'es2015', 'react' ] };
-
-                head = transform(head, options).code;
-                solution = transform(solution, options).code;
-                tail = transform(tail, options).code;
-                test = transform(test, options).code;
-
-                const { JSDOM } = require('jsdom');
-                // Mock DOM document for ReactDOM.render method
-                const jsdom = new JSDOM(`<!doctype html>
-                  <html>
-                    <body>
-                      <div id="challenge-node"></div>
-                    </body>
-                  </html>
-                `);
-                const { window } = jsdom;
-
-                // Mock DOM for ReactDOM tests
-                document = window.document;
-                global.window = window;
-                global.document = window.document;
-
-              }
-
-              const editor = {
-                getValue() { return code; },
-                getOriginalCode() { return originalCode; }
-              };
-              /* eslint-enable no-unused-vars */
-              try {
-                (() => {
-                  return eval(
-                    head + '\n;;' +
-                    solution + '\n;;' +
-                    tail + '\n;;' +
-                    test
-                  );
-                })();
-              } catch (e) {
-                t.fail(e);
-              }
+              evaluateTest(solution, assert, react, redux, reactRedux,
+                head, tail, test, tapTest);
             });
           });
         })
@@ -244,10 +188,12 @@ Observable.from(getChallenges())
       if (noSolutions) {
         console.log(
           '# These challenges have no solutions\n- [ ] ' +
-            noSolutions.join('\n- [ ] ')
+          noSolutions.join('\n- [ ] ')
         );
       }
     },
-    err => { throw err; },
+    err => {
+      throw err;
+    },
     () => process.exit(0)
   );

unpack.js

@@ -0,0 +1,87 @@
+/* eslint-disable no-eval, no-process-exit */
+import fs from 'fs-extra';
+import path from 'path';
+import browserify from 'browserify';
+import getChallenges from './getChallenges';
+import {UnpackedChallenge, ChallengeFile} from './unpackedChallenge';
+
+// Unpack all challenges
+// from all seed/challenges/00-foo/bar.json files
+// into seed/unpacked/00-foo/bar/000-id.html files
+//
+// todo: unpack translations too
+// todo: use common/app/routes/Challenges/utils/index.js:15 maps
+// to determine format/style for non-JS tests
+// todo: figure out embedded images etc. served from elsewhere in the project
+// todo: prettier/clearer CSS
+
+// bundle up the test-running JS
+function createUnpackedBundle() {
+  let unpackedFile = path.join(__dirname, 'unpacked.js');
+  let b = browserify(unpackedFile).bundle();
+  b.on('error', console.error);
+  let unpackedBundleFile =
+    path.join(__dirname, 'unpacked', 'unpacked-bundle.js');
+  const bundleFileStream = fs.createWriteStream(unpackedBundleFile);
+  bundleFileStream.on('finish', () => {
+    console.log('Wrote bundled JS into ' + unpackedBundleFile);
+  });
+  bundleFileStream.on('pipe', () => {
+    console.log('Writing bundled JS...');
+  });
+  bundleFileStream.on('error', console.error);
+  b.pipe(bundleFileStream);
+  // bundleFileStream.end();  // do not do this prematurely!
+}
+
+let currentlyUnpackingDir = null;
+
+function unpackChallengeBlock(challengeBlock) {
+  let challengeBlockPath = path.parse(challengeBlock.fileName);
+  let unpackedChallengeBlockDir = path.join(
+    __dirname,
+    'unpacked',
+    challengeBlockPath.dir,
+    challengeBlockPath.name
+  );
+  fs.mkdirp(unpackedChallengeBlockDir, (err) => {
+    if (err && err.code !== 'EEXIST') {
+      console.log(err);
+      throw err;
+    }
+
+    if (currentlyUnpackingDir !== challengeBlockPath.dir) {
+      currentlyUnpackingDir = challengeBlockPath.dir;
+      console.log(`Unpacking into ${currentlyUnpackingDir}:`);
+    }
+    console.log(`  ${challengeBlock.name}`);
+
+    // write a copy of the challenge block into unpacked dir
+    delete challengeBlock.fileName;
+    delete challengeBlock.superBlock;
+    delete challengeBlock.superOrder;
+    let challengeBlockCopy =
+      new ChallengeFile(
+        unpackedChallengeBlockDir,
+        challengeBlockPath.name,
+        '.json');
+    challengeBlockCopy.write(JSON.stringify(challengeBlock, null, 2));
+
+    // unpack each challenge into an HTML file
+    let index = 0;
+    challengeBlock.challenges.forEach(challenge => {
+      new UnpackedChallenge(
+        unpackedChallengeBlockDir,
+        challenge,
+        index
+      ).unpack();
+      index += 1;
+    });
+  });
+}
+
+createUnpackedBundle();
+let challenges = getChallenges();
+challenges.forEach(challengeBlock => {
+  unpackChallengeBlock(challengeBlock);
+});

unpacked.css

@@ -0,0 +1,22 @@
+body {
+    font-family: sans-serif;
+}
+
+script.unpacked, pre.unpacked {
+    display: block;
+    font-family: monospace;
+    font-size: 14px;
+    white-space: pre;
+    border: 1px solid blue;
+    background: #EFEFEF;
+    padding: .5em 1em;
+    margin: 1em;
+    overflow: auto;
+}
+
+div.unpacked {
+    border: 1px solid black;
+    padding: .5em 1em;
+    margin: 1em;
+    overflow: auto;
+}

unpacked.js

@@ -0,0 +1,18 @@
+/* eslint-disable no-unused-vars,max-len */
+window._ = require('lodash');
+window.test = require('tape').test;
+
+// check for Browser TAP chrome extension, available here:
+// https://chrome.google.com/webstore/detail/browser-tap/ncfblaiipckncgeipgmpdioedcdmofei?hl=en
+if (window.tapExtension) {
+  window.test = window.tapExtension(window.test);
+}
+
+window.addAssertsToTapTest = require('./addAssertsToTapTest');
+window.$ = require('jquery');
+
+test('framework', function(t) {
+  t.plan(1);
+  t.equal(1, 1, 'one equals one');
+});
+

unpackedChallenge.js

@@ -0,0 +1,258 @@
+/* eslint-disable no-inline-comments */
+import fs from 'fs-extra';
+import path from 'path';
+import _ from 'lodash';
+
+const jsonLinePrefix = '//--JSON:';
+
+class ChallengeFile {
+  constructor(dir, name, suffix) {
+    this.dir = dir;
+    this.name = name;
+    this.suffix = suffix;
+  }
+
+  filePath() {
+    return path.join(this.dir, this.name + this.suffix);
+  }
+
+  write(contents) {
+    if (_.isArray(contents)) {
+      contents = contents.join('\n');
+    }
+    fs.writeFile(this.filePath(), contents, err => {
+      if (err) {
+        throw err;
+      }
+    });
+  }
+
+  readChunks() {
+    // todo: make this work async
+    // todo: make sure it works with encodings
+    let data = fs.readFileSync(this.filePath());
+    let lines = data.toString().split(/(?:\r\n|\r|\n)/g);
+    let chunks = {};
+    let readingChunk = null;
+    lines.forEach(line => {
+      let chunkEnd = /(<!|\/\*)--end--/;
+      let chunkStart = /(<!|\/\*)--(\w+)--/;
+
+      line = line.toString();
+
+      if (chunkEnd.test(line)) {
+        if (!readingChunk) {
+          throw 'Encountered --end-- without being in a chunk';
+        }
+        readingChunk = null;
+      } else if (chunkStart.test(line)) {
+        let chunkName = line.match(chunkStart)[ 2 ];
+        if (readingChunk) {
+          throw `Encountered chunk ${chunkName} start `
+          + `while already reading ${readingChunk}:
+           ${line}`;
+        }
+        readingChunk = chunkName;
+      } else if (readingChunk) {
+        if (line.startsWith(jsonLinePrefix)) {
+          line = JSON.parse(line.slice(jsonLinePrefix.length));
+        }
+        if (!chunks[readingChunk]) {
+          chunks[readingChunk] = [];
+        }
+        // don't push empty top lines
+        if (!(!line && chunks[readingChunk].length === 0)) {
+          chunks[ readingChunk ].push(line);
+        }
+      }
+    });
+
+    // hack to deal with solutions field being an array of a single string
+    // instead of an array of lines like other fields
+    if (chunks.solutions) {
+      chunks.solutions = [chunks.solutions.join('\n')];
+    }
+
+    // console.log(JSON.stringify(chunks, null, 2));
+    return chunks;
+  }
+}
+
+export {ChallengeFile};
+
+class UnpackedChallenge {
+  constructor(targetDir, challengeJson, index) {
+    this.targetDir = targetDir;
+    this.index = index;
+
+    // todo: merge challengeJson properties into this object?
+    this.challenge = challengeJson;
+
+    // extract names of block and superblock from path
+    // note: this is a bit redundant with the
+    // fileName,superBlock,superOrder fields
+    // that getChallenges() adds to the challenge JSON
+    let targetDirPath = path.parse(targetDir);
+    let parentDirPath = path.parse(targetDirPath.dir);
+    // superBlockName e.g. "03-front-end-libraries"
+    this.superBlockName = parentDirPath.base;
+    // challengeBlockName e.g. "bootstrap"
+    this.challengeBlockName = targetDirPath.base;
+  }
+
+  unpack() {
+    this.challengeFile()
+      .write(this.unpackedHTML());
+  }
+
+  challengeFile() {
+    return new ChallengeFile(this.targetDir, this.baseName(), '.html');
+  }
+
+  baseName() {
+    // eslint-disable-next-line no-nested-ternary
+    let prefix = ((this.index < 10) ? '00' : (this.index < 100) ? '0' : '')
+      + this.index;
+    return `${prefix}-${this.challenge.id}`;
+  }
+
+  expandedDescription(description) {
+    let out = [];
+    description.forEach(part => {
+      if (_.isString(part)) {
+        out.push(part.toString());
+      } else {
+        // Descriptions are weird since sometimes they're text and sometimes
+        // they're "steps" which appear one at a time with optional pix and
+        // captions and links, or "questions" with choices and expanations...
+        // For now we preserve non-string descriptions via JSON but this is
+        // not a great solution.
+        // It would be better if "steps" and "description" were separate fields.
+        // For the record, the (unnamed) fields in step are:
+        // 0: image URL
+        // 1: caption
+        // 2: text
+        // 3: link URL
+        out.push(jsonLinePrefix + JSON.stringify(part));
+      }
+    });
+    // indent by 2
+    return out;
+  }
+
+  expandedTests(tests) {
+    if (!tests) {
+      return [];
+    }
+    let out = [];
+    tests.forEach(test => {
+      if (_.isString(test)) {
+        out.push(test);
+      } else {
+        // todo: figure out what to do about these id-title challenge links
+        out.push(jsonLinePrefix + JSON.stringify(test));
+      }
+    });
+    return out;
+  }
+
+  unpackedHTML() {
+    let text = [];
+    text.push('<html>');
+    text.push('<head>');
+    text.push('<link rel="stylesheet" href="../../../unpacked.css">');
+    text.push('<!-- shim to enable running the tests in-browser -->');
+    text.push('<script src="../../unpacked-bundle.js"></script>');
+    text.push('</head>');
+    text.push('<body>');
+    text.push(`<h1>${this.challenge.title}</h1>`);
+    text.push(`<p>This is the <b>unpacked</b> version of 
+        <code>${this.superBlockName}/${this.challengeBlockName}</code> 
+        (challenge id <code>${this.challenge.id}</code>).</p>`);
+    text.push('<p>Open the JavaScript console to see test results.</p>');
+
+    // text.push(`<p>Edit this HTML file (between &lt;!--s only!)
+    //    and run <code>npm repack ???</code>
+    //    to incorporate your changes into the challenge database.</p>`);
+
+    text.push('');
+    text.push('<h2>Description</h2>');
+    text.push('<div class="unpacked description">');
+    text.push('<!--description-->');
+    text.push(this.expandedDescription(this.challenge.description).join('\n'));
+    text.push('<!--end-->');
+    text.push('</div>');
+
+    text.push('');
+    text.push('<h2>Seed</h2>');
+    text.push('<!--seed--><pre class="unpacked">');
+    if (this.challenge.seed) {
+      text.push(text, this.challenge.seed.join('\n'));
+    }
+    text.push('<!--end-->');
+    text.push('</pre>');
+
+    // Q: What is the difference between 'seed' and 'challengeSeed' ?
+    text.push('');
+    text.push('<h2>Challenge Seed</h2>');
+    text.push('<!--challengeSeed--><pre class="unpacked">');
+    if (this.challenge.challengeSeed) {
+      text.push(text, this.challenge.challengeSeed.join('\n'));
+    }
+    text.push('<!--end-->');
+    text.push('</pre>');
+
+    text.push('');
+    text.push('<h2>Head</h2>');
+    text.push('<!--head--><script class="unpacked head">');
+    if (this.challenge.head) {
+      text.push(text, this.challenge.head.join('\n'));
+    }
+    text.push('</script><!--end-->');
+
+    text.push('');
+    text.push('<h2>Solution</h2>');
+    text.push(
+      '<!--solutions--><script class="unpacked solution" id="solution">'
+    );
+    // Note: none of the challenges have more than one solution
+    // todo: should we deal with multiple solutions or not?
+    if (this.challenge.solutions && this.challenge.solutions.length > 0) {
+      let solution = this.challenge.solutions[0];
+      text.push(solution);
+    }
+    text.push('</script><!--end-->');
+
+    text.push('');
+    text.push('<h2>Tail</h2>');
+    text.push('<!--tail--><script class="unpacked tail">');
+    if (this.challenge.tail) {
+      text.push(text, this.challenge.tail.join('\n'));
+    }
+    text.push('</script><!--end-->');
+
+    text.push('');
+    text.push('<h2>Tests</h2>');
+    text.push('<script class="unpacked tests">');
+    text.push(`test(\'${this.challenge.title} challenge tests\', ` +
+      'function(t) {');
+    text.push('let assert = addAssertsToTapTest(t);');
+    text.push('let code = document.getElementById(\'solution\').innerText;');
+    text.push('t.plan(' +
+      (this.challenge.tests ? this.challenge.tests.length : 0) +
+      ');');
+    text.push('/*--tests--*/');
+    text.push(this.expandedTests(this.challenge.tests).join('\n'));
+    text.push('/*--end--*/');
+    text.push('});')
+    text.push('</script>');
+
+    text.push('');
+    text.push('</body>');
+    text.push('</html>');
+    return text;
+  }
+}
+
+export {UnpackedChallenge};
+