Split single markdown file (list of sprints) to several (one for each sprint)

split-sprints.js

const fs = require('fs');

const MATCH_SPRINT = /^## Sprint (\d+):[\S\s]+?demo<\/a>/ugm;
const HEADER_LEVEL = /^##/ugm;
const SUFFIX = /\.md$/;

const original = fs.readFileSync('sprints-2018.md', 'utf8');

console.log(`Original file has ${original.length} lines`);

const index = [];
let list;

while ((list = MATCH_SPRINT.exec(original)) !== null) {
  console.log(list[1]);

  const filename = `sprints/sprint-${String(list[1]).trim()}.md`;
  const data = list[0].replace(HEADER_LEVEL, '#');
  fs.writeFileSync(filename, data, 'utf8');

  index.push(`* [Sprint ${list[1]}](${filename.replace(SUFFIX, '')})`);
}

const content = `# Sprints

${index.join('\n')}

`;

fs.writeFileSync('sprints.md', content, 'utf8');