github-publish-release/src/lib/commit-analyzer.ts

import _ from 'lodash';
import { getCommitHistory } from './get-commit-history';
import { getLastTag } from './get-last-tag';

/**
 * Analyses all commits after last git tag and calls cb with one of
 * "major", "minor", "patch" as a second parameter or ERROR_NO_CHANGES by default as first parameter.
 * Looks for [major], [minor] in commit history.
 *
 */
export default async function getVersionType() {
  const lastTag = await getLastTag();

  // Take the whole log when no tags found
  const commitRange = lastTag === '' ? '' : `${lastTag}..HEAD`;

  const commitHistory = await getCommitHistory(commitRange);
  if (commitHistory === '') {
    throw new Error('No changes in git');
  }

  // find the first item from the commit history matching the release type
  const versionType = _.find(
    ['dev', 'major', 'minor', 'patch', 'premajor', 'preminor', 'prepatch', 'prerelease'],
    (item) => _.includes(commitHistory, `[${item}]`),
  );
  if (!versionType) {
    throw new Error("Can't recognise the release type! Please make sure the repo follows the commit message standard.");
  }

  return versionType;
}