docs: add changelog

scripts/changelog.ts

@@ -0,0 +1,44 @@
+import fs from 'fs'
+import path from 'path'
+
+const currentVersion = require('../package.json').version
+if (!currentVersion) throw new Error('Cant\'t detect library version.')
+
+const changelogPath = path.resolve(__dirname, '../CHANGELOG.md')
+const changelog = fs.readFileSync(changelogPath, { encoding: 'utf-8' })
+if (changelog.includes(`## [${currentVersion}]`))
+  throw new Error('Current version has already been documented.')
+let futureChangelog = ''
+
+// Add version section
+let arr = changelog.split('## [Unreleased]')
+arr[1] = `
+
+## [${currentVersion}] - ${new Date().toISOString().slice(0, 10)}
+### Removed:
+- **[BREAKING]** ListName: description
+
+### Added:
+- 
+
+### Fixed:
+- ` + arr[1]
+futureChangelog = arr.join('## [Unreleased]')
+
+// Update footer
+arr = futureChangelog
+  .split('\n')
+  .map(line => line.startsWith('[Unreleased]')
+    ? `[Unreleased]: https://github.com/EndBug/add-and-commit/compare/v${currentVersion}...HEAD`
+    : line)
+
+// eslint-disable-next-line no-useless-escape
+const lastVersion = ([...arr].reverse()[1]?.match(/\[([^\][]*)]/) || [])[0].replace(/[\[\]']+/g, '')
+if (!lastVersion) throw new Error('Can\'t find last version in changelog.')
+
+const lastLine = `[${currentVersion}]: https://github.com/EndBug/add-and-commit/compare/v${lastVersion}...v${currentVersion}`
+if (arr[arr.length - 1] === '') arr[arr.length - 1] = lastLine
+else arr.push(lastLine)
+futureChangelog = arr.join('\n')
+
+fs.writeFileSync(changelogPath, futureChangelog)