feat: Initial implementation of tumblr importer

Fixes: #47

lib/import.js

@@ -3,7 +3,7 @@ const { safeDump } = require('js-yaml');
 
 const importers = require('./importers');
 
-const supportedTypes = ['wordpress', 'ghost'];
+const supportedTypes = ['wordpress', 'ghost', 'tumblr'];
 
 function ensureFolder(dir) {
   if (!existsSync(dir)){

lib/importers/tumblr.js

@@ -0,0 +1,60 @@
+const { promisify } = require("util");
+const { parseString } = require("xml2js");
+const _ = require("lodash");
+
+const parse = promisify(parseString);
+
+module.exports = async function tumblrImport(fileContents) {
+  const data = await parse(fileContents);
+
+  let channel = data.tumblr.posts[0];
+
+  let authors = [];
+  let tags = [];
+
+  let content = _.chain(channel.post)
+    .map(post => {
+      let postType = post.$.type;
+      let id = post.$.id;
+      let date = new Date(post.$.date);
+      let author = post.$.tumblelog;
+      let title, content;
+
+      switch (postType) {
+        case "regular":
+          title = post["regular-title"][0];
+          content = post["regular-body"][0];
+          break;
+        case "quote":
+          title = post["quote-text"][0];
+          content = post["quote-text"][0];
+          break;
+      }
+
+      if (!authors.find(existingAuthor => existingAuthor.id === author)) {
+        authors.push({
+          id: author,
+          name: author
+        });
+      }
+
+      let result = {
+        id,
+        title,
+        authors,
+        date,
+        tags,
+        content
+      };
+
+      return result;
+    })
+    .compact()
+    .value();
+
+  return {
+    tags,
+    authors,
+    content
+  };
+};