Implement "fetch-medium" function

No processing yet, but at least we get the post and metadata in
a standard format

functions.js

@@ -1,13 +1,62 @@
 const r2 = require('r2')
+const path = require('path')
+const fs = require('fs')
 const getPost = require('mediumexporter').getPost
 
 /**
  * function [fetchFromMedium]
  * @returns [string] status
 */
+
 const fetchFromMedium = async (mediumUrl) => {
-  console.debug('Fetching: ' + mediumUrl);
-  return await getPost(mediumUrl, { returnObject: true })
+  console.info(`Fetching: ${mediumUrl}`);
+  output = path.join(process.env.PWD, 'content')
+
+  // use mediumexporter's getPost function to fetch a Medium post
+  const post = await getPost(mediumUrl, {
+      returnObject: true,
+      output: output,
+    }).catch((err) => {
+      return {
+        error: err,
+      }
+    })
+
+  // set output folder path
+  // this is based on what mediumexporter chooses as the output folder
+  outputFolder = path.join(output, post.slug)
+
+  console.info(`Saving to: ${outputFolder}`)
+
+  if (!fs.existsSync(path.join(outputFolder, post.slug))) {
+    fs.mkdirSync(outputFolder, { recursive: true })
+  }
+
+  // mediumexporter writes a plain .md file if the post has no media
+  // if that is the case, we should create the subfolder manually
+  // and copy the data there.
+  if (fs.existsSync(path.join(output, post.slug + '.md'))) {
+    fs.renameSync(
+      path.join(output, post.slug + '.md'),
+      path.join(outputFolder, 'index.md')
+    )
+  }
+
+  // generate metadata
+  const metadata = JSON.stringify({
+    title: post.title,
+    subtitle: post.subtitle,
+    date: new Date(post.date),
+    tags: post.tags,
+    url: post.url,
+    slug: post.slug,
+    images: post.images,
+    featuredImage: post.featuredImage,
+  })
+
+  // write metadata to output folder
+  fs.writeFileSync(path.join(outputFolder, 'metadata.json'))
+  return post
 };
 
 /**

index.js

@@ -19,8 +19,7 @@ program.command('fetch-medium <post_url>')
   .action((post_url) => {
     fetchFromMedium(post_url)
       .then((post) => {
-        console.info(`"${post.title}" fetched successfully`)
-        console.debug(post)
+        console.info(`"${post.title}" fetched successfully.`)
       })
   });
 
@@ -41,7 +40,11 @@ program.command('medium-to-ghost <mediumUrl>')
 program.command('create-user <username> <email>')
   .description('create ghost-import.json to import Medium user to Ghost')
   .action(async (username, email) => {
-    const jsonOut = await generateUserData(username, email);
+    const jsonOut = await generateUserData(username, email)
+      .catch((err) => {
+        console.log(`Error: ${err.error}`)
+        return
+      })
     console.log(await jsonOut);
   });