refactor(multi) move preparation into curriculum

curriculum/getChallenges.js

@@ -1,5 +1,5 @@
 const path = require('path');
-const { findIndex } = require('lodash');
+const { findIndex, reduce, toString } = require('lodash');
 const readDirP = require('readdirp-walk');
 const { parseMarkdown } = require('../tools/challenge-md-parser');
 const fs = require('fs');
@@ -11,8 +11,10 @@ const {
 /* eslint-enable max-len*/
 const { COMMENT_TRANSLATIONS } = require('./comment-dictionary');
 
-const { dasherize } = require('../utils/slugs');
 const { isAuditedCert } = require('../utils/is-audited');
+const { dasherize, nameify } = require('../utils/slugs');
+const { createPoly } = require('../utils/polyvinyl');
+const { blockNameify } = require('../utils/block-nameify');
 
 const challengesDir = path.resolve(__dirname, './challenges');
 const metaDir = path.resolve(challengesDir, '_meta');
@@ -180,6 +182,43 @@ Trying to parse ${fullPath}`);
   challenge.template = template;
   challenge.time = time;
 
+  return prepareChallenge(challenge);
+}
+
+// gets the challenge ready for sourcing into Gatsby
+function prepareChallenge(challenge) {
+  challenge.name = nameify(challenge.title);
+  if (challenge.files) {
+    challenge.files = reduce(
+      challenge.files,
+      (map, file) => {
+        map[file.key] = {
+          ...file,
+          head: arrToString(file.head),
+          contents: arrToString(file.contents),
+          tail: arrToString(file.tail)
+        };
+        return map;
+      },
+      {}
+    );
+    // TODO: This should be something that can be folded into the above reduce
+    challenge.files = Object.keys(challenge.files)
+      .filter(key => challenge.files[key])
+      .map(key => challenge.files[key])
+      .reduce(
+        (files, file) => ({
+          ...files,
+          [file.key]: {
+            ...createPoly(file),
+            seed: file.contents.slice(0)
+          }
+        }),
+        {}
+      );
+  }
+  challenge.block = dasherize(challenge.block);
+  challenge.superBlock = blockNameify(challenge.superBlock);
   return challenge;
 }
 
@@ -255,3 +294,7 @@ function getBlockNameFromFullPath(fullFilePath) {
   const [, block] = fullFilePath.split(path.sep).reverse();
   return block;
 }
+
+function arrToString(arr) {
+  return Array.isArray(arr) ? arr.join('\n') : toString(arr);
+}