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const fs = require('fs');

const yaml = require('yaml');

const path = require('path');

const async = require('async');

const dedent = require('dedent');

const blogAuthorsFile = fs.readFileSync(

path.join(__dirname, '../src/data/blog/authors.yaml'),

{ encoding: 'utf-8' }

);

const blogAuthors = yaml.parse(blogAuthorsFile);

const applyBlogAuthors = metadataAuthors =>

metadataAuthors

.split(' and ')

.map(authorName => {

const foundAuthor = blogAuthors.find(

author => author.name === authorName

);

return foundAuthor ? `'${foundAuthor.id}'` : authorName;

})

.join(', ');

// eslint-disable-next-line import/no-extraneous-dependencies

const metadataParser = require('markdown-yaml-metadata-parser');

const commandLineArgs = process.argv.slice(2);

const getMarkdownFilesPath = args => (args.length ? args[0] : '.');

const markdownPath = path.join(getMarkdownFilesPath(commandLineArgs));

const processMarkdownFile = (originalSlug, source) => {

const { content, metadata } = metadataParser(source);

const dateFromMetadata = new Date(metadata.date);

const dateString = dateFromMetadata.toISOString().split('T')[0];

const newFileName = `${dateString}-${originalSlug}.md`;

const metadataAuthors = metadata.author

? `[${applyBlogAuthors(metadata.author)}]`

: `['node-js-website']`;

const newContent = dedent`

---

title: ${metadata.title}

blogAuthors: ${metadataAuthors}

category: '${metadata.category.toLowerCase()}'

---

return { content: `${newContent}\n${content}`, filename: newFileName };

};

if (fs.existsSync(markdownPath)) {

const filenames = fs.readdirSync(path.join(markdownPath));

const markdownFilesFromDirectory = filenames.filter(

filename =>

filename.toLowerCase().includes('.md') &&

!filename.toLowerCase().includes('index.md')

);

const blogQueue = async.queue((filename, callback) => {

const markdownFile = path.join(markdownPath, filename);

fs.readFile(markdownFile, { encoding: 'utf-8' }, (_, data) => {

const originalSlug = filename.toLowerCase().replace('.md', '');

const { content, filename: newFileName } = processMarkdownFile(

originalSlug,

data

);

const newMarkdownFile = path.join(markdownPath, newFileName);

fs.unlink(markdownFile, () => {});

fs.writeFile(newMarkdownFile, content, () => callback());

});

blogQueue.push([...markdownFilesFromDirectory]);

// eslint-disable-next-line no-console

blogQueue.drain(() => console.log('Finished Processing'));

}