storybook/scripts/release/get-changelog-from-file.ts

/* eslint-disable no-console */
import { setOutput } from '@actions/core';
import chalk from 'chalk';
import { program } from 'commander';
import { readFile } from 'fs-extra';
import path from 'path';
import semver from 'semver';
import dedent from 'ts-dedent';
import { getCurrentVersion } from './get-current-version';

program
  .name('get-changelog-from-file')
  .description(
    'get changelog entry for specific version. If not version argument specified it will use the current version in code/package.json'
  )
  .arguments('[version]')
  .option('-V, --verbose', 'Enable verbose logging', false);

export const getChangelogFromFile = async (args: { version?: string; verbose?: boolean }) => {
  const version = args.version || (await getCurrentVersion());
  const isPrerelease = semver.prerelease(version) !== null;
  const changelogFilename = isPrerelease ? 'CHANGELOG.prerelease.md' : 'CHANGELOG.md';
  const changelogPath = path.join(__dirname, '..', '..', changelogFilename);

  console.log(`📝 Getting changelog from ${chalk.blue(changelogPath)}`);

  const fullChangelog = await readFile(changelogPath, 'utf-8');
  const changelogForVersion = fullChangelog.split(/(^|\n)## /).find((v) => v.startsWith(version));
  if (!changelogForVersion) {
    throw new Error(
      `Could not find changelog entry for version ${chalk.blue(version)} in ${chalk.green(
        changelogPath
      )}`
    );
  }
  const result = `## ${changelogForVersion}`;

  console.log(dedent`📝 Changelog entry found:
      ${result}`);
  if (process.env.GITHUB_ACTIONS === 'true') {
    setOutput('changelog', result);
  }
  return result;
};

if (require.main === module) {
  const parsed = program.parse();
  getChangelogFromFile({ version: parsed.args[0], verbose: parsed.opts().verbose }).catch((err) => {
    console.error(err);
    process.exit(1);
  });
}