feat: watch challenges (#34321)

client/plugins/fcc-source-challenges/gatsby-node.js

@@ -1,31 +1,70 @@
-const { createChallengeNodes } = require('./create-Challenge-nodes');
+const chokidar = require('chokidar');
+
+const { createChallengeNode } = require('./create-Challenge-nodes');
 
 exports.sourceNodes = function sourceChallengesSourceNodes(
   { actions, reporter },
   pluginOptions
 ) {
-  if (typeof pluginOptions.source !== 'function') {
+  const { source, onSourceChange, curriculumPath } = pluginOptions;
+  if (typeof source !== 'function') {
     reporter.panic(`
-"source" is a required option for fcc-source-challenges. It must be a function
-that delivers challenge files to the plugin
-      `);
+    "source" is a required option for fcc-source-challenges. It must be a
+    function that delivers challenge objects to the plugin
+    `);
+  }
+  if (typeof onSourceChange !== 'function') {
+    reporter.panic(`
+    "onSourceChange" is a required option for fcc-source-challenges. It must be
+    a function that delivers a new challenge object to the plugin
+    `);
+  }
+  if (typeof curriculumPath !== 'string') {
+    reporter.panic(`
+    "curriculumPath" is a required option for fcc-source-challenges. It must be
+    a path to a curriculum directory
+    `);
   }
-  // TODO: Add live seed updates
   const { createNode } = actions;
+  const watcher = chokidar.watch(curriculumPath, {
+    ignored: /(^|[\/\\])\../,
+    persistent: true
+  });
 
-  const { source } = pluginOptions;
-  return source()
-    .then(challenges =>
-      challenges
-        .filter(challenge => challenge.superBlock !== 'Certificates')
-        .map(challenge => createChallengeNodes(challenge, reporter))
-        .map(node => createNode(node))
-    )
-    .catch(e =>
-      reporter.panic(`fcc-source-challenges
+  watcher.on('ready', sourceAndCreateNodes).on(
+    'change',
+    filePath =>
+      (/\.md$/).test(filePath)
+        ? onSourceChange(filePath)
+            .then(challenge => {
+              reporter.info(
+                `File changed at ${filePath}, replacing challengeNode id ${
+                  challenge.id
+                }`
+              );
+              return createChallengeNode(challenge, reporter);
+            })
+            .then(createNode)
+        : null
+  );
+
+  function sourceAndCreateNodes() {
+    return source()
+      .then(challenges => Promise.all(challenges))
+      .then(challenges =>
+        challenges
+          .filter(
+            challenge => challenge.superBlock.toLowerCase() !== 'certificates'
+          )
+          .map(challenge => createChallengeNode(challenge, reporter))
+          .map(node => createNode(node))
+      )
+      .catch(e =>
+        reporter.panic(`fcc-source-challenges
 
   ${e.message}
 
   `)
-    );
+      );
+  }
 };