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fix: preserve frontmatter when updating changelog (#108)
* chore: add failing test for retaining frontmatter Signed-off-by: Tim Knight <[email protected]> * fix: preserve frontmatter when updating changelog fixes #106 Signed-off-by: Tim Knight <[email protected]> * chore: add tests for upgrade path from standard-version Signed-off-by: Tim Knight <[email protected]> * fix: preserve front matter when swapping from standard-version - Matches based off # Changelog title position rather than new header position Signed-off-by: Tim Knight <[email protected]> * chore: run linting Signed-off-by: Tim Knight <[email protected]> * chore: refactoring, extract functions Signed-off-by: Tim Knight <[email protected]> * chore: front matter usually on separate lines to title Signed-off-by: Tim Knight <[email protected]> * chore: apply eslint . --fix Signed-off-by: Tim Knight <[email protected]> --------- Signed-off-by: Tim Knight <[email protected]>
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‎lib/lifecycles/changelog.js‎

Lines changed: 28 additions & 7 deletions
Original file line numberDiff line numberDiff line change
@@ -18,17 +18,38 @@ Changelog.START_OF_LAST_RELEASE_PATTERN = START_OF_LAST_RELEASE_PATTERN
1818

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module.exports = Changelog
2020

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/**
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* Front matter is only extracted and therefore retained in final output where Changelog "header" begins with #Changelog,
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* e.g. meets Standard-Version (last release) or commit-and-tag-version(current) format
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*/
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function extractFrontMatter (oldContent) {
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const headerStart = oldContent.indexOf('# Changelog')
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return headerStart !== -1 || headerStart !== 0
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? oldContent.substring(0, headerStart)
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: ''
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}
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/**
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* find the position of the last release and remove header
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*/
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function extractChangelogBody (oldContent) {
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const oldContentStart = oldContent.search(START_OF_LAST_RELEASE_PATTERN)
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return oldContentStart !== -1
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? oldContent.substring(oldContentStart)
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: oldContent
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}
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function outputChangelog (args, newVersion) {
2243
return new Promise((resolve, reject) => {
2344
createIfMissing(args)
2445
const header = args.header
2546

26-
let oldContent = args.dryRun || args.releaseCount === 0 ? '' : fs.readFileSync(args.infile, 'utf-8')
27-
const oldContentStart = oldContent.search(START_OF_LAST_RELEASE_PATTERN)
28-
// find the position of the last release and remove header:
29-
if (oldContentStart !== -1) {
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oldContent = oldContent.substring(oldContentStart)
31-
}
47+
const oldContent = args.dryRun || args.releaseCount === 0 ? '' : fs.readFileSync(args.infile, 'utf-8')
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const oldContentBody = extractChangelogBody(oldContent)
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const changelogFrontMatter = extractFrontMatter(oldContent)
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3253
let content = ''
3354
const context = { version: newVersion }
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const changelogStream = conventionalChangelog({
@@ -48,7 +69,7 @@ function outputChangelog (args, newVersion) {
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changelogStream.on('end', function () {
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checkpoint(args, 'outputting changes to %s', [args.infile])
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if (args.dryRun) console.info(`\n---\n${chalk.gray(content.trim())}\n---\n`)
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else writeFile(args, args.infile, header + '\n' + (content + oldContent).replace(/\n+$/, '\n'))
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else writeFile(args, args.infile, changelogFrontMatter + header + '\n' + (content + oldContentBody).replace(/\n+$/, '\n'))
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return resolve()
5374
})
5475
})

‎test/core.spec.js‎

Lines changed: 58 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -165,17 +165,73 @@ describe('cli', function () {
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})
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describe('CHANGELOG.md exists', function () {
168-
it('appends the new release above the last release, removing the old header (legacy format)', async function () {
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it('appends the new release above the last release, removing the old header (legacy format), and does not retain any front matter', async function () {
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const frontMatter =
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'---\nstatus: new\n---\n'
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mock({
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bump: 'patch',
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changelog: 'release 1.0.1\n',
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fs: { 'CHANGELOG.md': 'legacy header format<a name="1.0.0">\n' },
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fs: { 'CHANGELOG.md': frontMatter + 'legacy header format<a name="1.0.0">\n' },
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tags: ['v1.0.0']
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})
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await exec()
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const content = fs.readFileSync('CHANGELOG.md', 'utf-8')
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content.should.match(/1\.0\.1/)
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content.should.not.match(/legacy header format/)
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content.should.not.match(/---status: new---/)
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})
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it('appends the new release above the last release, replacing the old header (standard-version format) with header (new format), and retains any front matter', async function () {
185+
const { header } = require('../defaults')
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const standardVersionHeader =
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'# Changelog\n\nAll notable changes to this project will be documented in this file. See [standard-version](https://github.com/conventional-changelog/standard-version) for commit guidelines.'
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const frontMatter =
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'---\nstatus: new\n---\n'
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const changelog101 =
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'### [1.0.1](/compare/v1.0.0...v1.0.1) (YYYY-MM-DD)\n\n\n### Bug Fixes\n\n* patch release ABCDEFXY\n'
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const changelog100 =
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'### [1.0.0](/compare/v0.0.1...v1.0.0) (YYYY-MM-DD)\n\n\n### Features\n\n* Version one feature set\n'
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199+
const initialChangelog = frontMatter + '\n' + standardVersionHeader + '\n' + changelog100
200+
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mock({
202+
bump: 'patch',
203+
changelog: changelog101,
204+
fs: { 'CHANGELOG.md': initialChangelog },
205+
tags: ['v1.0.0']
206+
})
207+
await exec()
208+
const content = fs.readFileSync('CHANGELOG.md', 'utf-8')
209+
content.should.equal(frontMatter + '\n' + header + '\n' + changelog101 + changelog100)
210+
})
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212+
it('appends the new release above the last release, removing the old header (new format), and retains any front matter', async function () {
213+
const { header } = require('../defaults')
214+
const frontMatter =
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'---\nstatus: new\n---\n'
216+
217+
const changelog101 =
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'### [1.0.1](/compare/v1.0.0...v1.0.1) (YYYY-MM-DD)\n\n\n### Bug Fixes\n\n* patch release ABCDEFXY\n'
219+
220+
const changelog100 =
221+
'### [1.0.0](/compare/v0.0.1...v1.0.0) (YYYY-MM-DD)\n\n\n### Features\n\n* Version one feature set\n'
222+
223+
const initialChangelog = frontMatter + '\n' + header + '\n' + changelog100
224+
225+
mock({
226+
bump: 'patch',
227+
changelog: changelog101,
228+
fs: { 'CHANGELOG.md': initialChangelog },
229+
tags: ['v1.0.0']
230+
})
231+
await exec()
232+
233+
const content = fs.readFileSync('CHANGELOG.md', 'utf-8')
234+
content.should.equal(frontMatter + '\n' + header + '\n' + changelog101 + changelog100)
179235
})
180236

181237
it('appends the new release above the last release, removing the old header (new format)', async function () {

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