thelounge/scripts/changelog.js

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/*
This (very The Lounge-custom) script is a helper to generate changelog entries.
Note that it is not meant to produce fully-automated changelogs like other tools
do, but merely prepare a changelog entry without risks of mistyping a URL or
missing a contribution: changelogs are meant for humans, and therefore must be
manually curated as such, with .
## Set up:
- Create a personal access token with `public_repo` at
https://github.com/settings/tokens. Make sure to write it down as you will not
be able to display it again.
- Use Node.js v8+:
```sh
nvm install 8
```
## Usage
npm v5 removes packages not listed in package.json when running `npm install` so
it is very likely you will have to run all those each time:
```sh
export CHANGELOG_TOKEN=<The personal access token created on GitHub above>
node scripts/changelog <version>
```
`<version>` must be either:
- A keyword among: major, minor, patch, prerelease, pre
- An explicit version of either format:
- `MAJOR.MINOR.PATCH` for a stable release, for example `2.5.0`
- `MAJOR.MINOR.PATCH-(pre|rc).N` for a pre-release, for example `2.5.0-rc.1`
## TODOs:
- Use better labels for better categorization
- Add some stats to the git commit (how many LOCs total / in this release, etc.)
- This script requires Node v8, but `npm version` currently fails with Node v8
as we gitignore package-lock.json (how is that even a thing?!).
*/
"use strict";
const _ = require("lodash");
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const colors = require("chalk");
const fs = require("fs");
const GraphQLClient = require("graphql-request").GraphQLClient;
const moment = require("moment");
const semver = require("semver");
const util = require("util");
const log = require("../src/log");
const packageJson = require("../package.json");
const token = process.env.CHANGELOG_TOKEN;
const readFile = util.promisify(fs.readFile);
const writeFile = util.promisify(fs.writeFile);
const changelogPath = "./CHANGELOG.md";
// CLI argument validations
if (token === undefined) {
log.error(`Environment variable ${colors.bold("CHANGELOG_TOKEN")} must be set.`);
process.exit(1);
}
if (process.argv[2] === undefined) {
log.error(`Argument ${colors.bold("version")} is missing`);
process.exit(1);
}
// If version is not a valid X.Y.Z, it may be something like "pre".
let version = semver.valid(process.argv[2]);
if (!version) {
version = semver.inc(packageJson.version, process.argv[2]);
}
function isValidVersion(str) {
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return /^[0-9]+\.[0-9]+\.[0-9]+(-(pre|rc)+\.[0-9]+)?$/.test(str);
}
if (!isValidVersion(version)) {
log.error(`Argument ${colors.bold("version")} is incorrect It must be either:`);
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log.error(
`- A keyword among: ${colors.green("major")}, ${colors.green("minor")}, ${colors.green(
"patch"
)}, ${colors.green("prerelease")}, ${colors.green("pre")}`
);
log.error(
`- An explicit version of format ${colors.green("x.y.z")} (stable) or ${colors.green(
"x.y.z-(pre|rc).n"
)} (pre-release).`
);
process.exit(1);
}
// Templates
function prereleaseTemplate(items) {
return `
## v${items.version} - ${items.date} [Pre-release]
[See the full changelog](${items.fullChangelogUrl})
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${
prereleaseType(items.version) === "rc"
? `This is a release candidate (RC) for v${stableVersion(
items.version
)} to ensure maximum stability for public release.
Bugs may be fixed, but no further features will be added until the next stable version.`
: `This is a pre-release for v${stableVersion(
items.version
)} to offer latest changes without having to wait for a stable release.
At this stage, features may still be added or modified until the first release candidate for this version gets released.`
}
Please refer to the commit list given above for a complete list of changes, or wait for the stable release to get a thoroughly prepared change log entry.
As with all pre-releases, this version requires explicit use of the \`next\` tag to be installed:
\`\`\`sh
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yarn global add thelounge@next
\`\`\`
`;
}
// Check if the object is empty, or if all array values within this object are
// empty
function isEmpty(list) {
const values = Object.values(list);
return values.length === 0 || values.every((entries) => entries.length === 0);
}
function stableTemplate(items) {
return `
## v${items.version} - ${items.date}
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For more details, [see the full changelog](${items.fullChangelogUrl}) and [milestone](${
items.milestone.url
}?closed=1).
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
@@ DESCRIPTION, ANNOUNCEMENT, ETC. @@
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
### Added
### Changed
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${
isEmpty(items.dependencies)
? ""
: `- Update production dependencies to their latest versions:
${printDependencyList(items.dependencies)}`
}
### Deprecated
${printList(items.deprecations)}
### Removed
### Fixed
### Security
${printList(items.security)}
### Documentation
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${
items.documentation.length === 0
? ""
: `In the main repository:
${printList(items.documentation)}`
}
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${
items.websiteDocumentation.length === 0
? ""
: `On the [website repository](https://github.com/thelounge/thelounge.github.io):
${printList(items.websiteDocumentation)}`
}
### Internals
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${printList(items.internals)}${
isEmpty(items.devDependencies)
? ""
: `
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- Update development dependencies to their latest versions:
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${printDependencyList(items.devDependencies)}`
}
@@@@@@@@@@@@@@@@@@@
@@ UNCATEGORIZED @@
@@@@@@@@@@@@@@@@@@@
${printUncategorizedList(items.uncategorized)}`;
}
// Returns true if the given version is a pre-release (i.e. 2.0.0-pre.3,
// 2.5.0-rc.1, etc.), or false otherwise
function isPrerelease(v) {
return v.includes("-");
}
// Given a version of `x.y.z-abc.n`, returns `abc`, i.e. the type of pre-release
function prereleaseType(v) {
return semver.prerelease(v)[0];
}
// Returns the stable version that this pre-release version is targeting. For
// example, if new version is 2.5.0-rc.2, next stable version will be 2.5.0.
function stableVersion(prereleaseVersion) {
return prereleaseVersion.substr(0, prereleaseVersion.indexOf("-"));
}
// Generates a compare-view URL between 2 versions of The Lounge
function fullChangelogUrl(v1, v2) {
return `https://github.com/thelounge/thelounge/compare/v${v1}...v${v2}`;
}
// This class is a facade to fetching details about commits / PRs / tags / etc.
// for a given repository of our organization.
class RepositoryFetcher {
// Holds a GraphQLClient and the name of the repository within the
// organization https://github.com/thelounge.
constructor(graphqlClient, repositoryName) {
this.graphqlClient = graphqlClient;
this.repositoryName = repositoryName;
}
// Base function that actually makes the GraphQL API call
async fetch(query, variables = {}) {
return this.graphqlClient.request(
query,
Object.assign(variables, {repositoryName: this.repositoryName})
);
}
// Returns the git commit that is attached to a given tag
async fetchTaggedCommit(tag) {
const tagQuery = `query fetchTaggedCommit($repositoryName: String!, $tag: String!) {
repository(owner: "thelounge", name: $repositoryName) {
ref(qualifiedName: $tag) {
tag: target {
oid
... on Tag {
commit: target {
oid
}
}
}
}
}
}`;
const data = await this.fetch(tagQuery, {tag});
return data.repository.ref.tag.commit || data.repository.ref.tag;
}
// Returns an array of annotated commits that have been made on the master
// branch since a given version. Each commit is an object that can optionally
// have a `pullRequestId` if this is a merge-PR commit.
async fetchCommitsSince(stopCommit) {
const commitsQuery = `query fetchCommits($repositoryName: String!, $afterCursor: String) {
repository(owner: "thelounge", name: $repositoryName) {
ref(qualifiedName: "master") {
target {
... on Commit {
history(first: 100, after: $afterCursor) {
pageInfo {
hasNextPage
endCursor
}
commits: nodes {
__typename
oid
abbreviatedOid
messageHeadline
url
author {
user {
login
url
}
}
comments(first: 100) {
nodes {
body
authorAssociation
}
}
}
}
}
}
}
}
}`;
// Recursive function that retrieves commits page after page until the last
// page or a given commit are reached.
const fetchPaginatedCommits = async (afterCursor = null) => {
const data = await this.fetch(commitsQuery, {afterCursor});
const {commits, pageInfo} = data.repository.ref.target.history;
if (commits.map(({oid}) => oid).includes(stopCommit.oid)) {
return _.takeWhile(commits, ({oid}) => oid !== stopCommit.oid);
} else if (pageInfo.hasNextPage) {
return commits.concat(await fetchPaginatedCommits(pageInfo.endCursor));
}
return commits;
};
const commits = await fetchPaginatedCommits();
commits.forEach((commit) => {
const resultPR = /^Merge pull request #([0-9]+) .+/.exec(commit.messageHeadline);
if (resultPR) {
commit.pullRequestId = parseInt(resultPR[1], 10);
}
});
return commits.reverse();
}
// Returns the last version prior to this new one. If new version is stable,
// the previous one will be stable as well (all pre-release versions will be
// skipped).
async fetchPreviousVersion(newVersion) {
const lastTagsQuery = `query fetchPreviousVersion($repositoryName: String!) {
repository(owner: "thelounge", name: $repositoryName) {
refs(refPrefix: "refs/tags/", first: 20, direction: DESC) {
tags: nodes {
name
}
}
}
}`;
const data = await this.fetch(lastTagsQuery);
const tags = data.repository.refs.tags;
let tag;
if (isPrerelease(newVersion)) {
tag = tags[0];
} else {
tag = tags.find(({name}) => !isPrerelease(name));
}
return tag.name.substr(1);
}
// Returns information on a milestone associated to a version (i.e. not a
// tag!) of the repository
async fetchMilestone(targetVersion) {
const milestonesQuery = `query fetchMilestone($repositoryName: String!) {
repository(owner: "thelounge", name: $repositoryName) {
milestones(last: 20) {
nodes {
title
url
}
}
}
}`;
const data = await this.fetch(milestonesQuery);
return data.repository.milestones.nodes.find(({title}) => title === targetVersion);
}
async fetchChunkedPullRequests(numbers) {
const chunks = _.chunk(numbers, 100);
let result = {};
for (const chunk of chunks) {
const data = await this.fetchPullRequests(chunk);
result = _.merge(result, data);
}
return result;
}
// Given a list of PR numbers, retrieve information for all those PRs. They
// are returned as a hash whose keys are `PR<number>`.
// This is a bit wonky (generating a dynamic GraphQL query) but the GitHub API
// does not have a way to retrieve multiple PRs given a list of IDs.
async fetchPullRequests(numbers) {
if (numbers.length === 0) {
return {};
}
const prQuery = `query fetchPullRequests($repositoryName: String!) {
repository(owner: "thelounge", name: $repositoryName) {
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${numbers
.map(
(number) => `
PR${number}: pullRequest(number: ${number}) {
__typename
title
url
author {
__typename
login
url
}
labels(first: 20) {
nodes {
name
}
}
commits(first: 100) {
nodes {
commit {
oid
}
}
}
}
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`
)
.join("")}
}
}`;
const data = await this.fetch(prQuery);
return data.repository;
}
// Chain several of the functions above together. Essentially, returns an
// array composed of PRs, and commits that belong to no PRs, existing between
// a given tag and master.
async fetchCommitsAndPullRequestsSince(tag) {
const taggedCommit = await this.fetchTaggedCommit(tag);
const commits = await this.fetchCommitsSince(taggedCommit);
const pullRequestIds = pullRequestNumbersInCommits(commits);
const pullRequests = await this.fetchChunkedPullRequests(pullRequestIds);
return combine(commits, pullRequests);
}
}
// Given an array of annotated commits, returns an array of PR numbers, integers
function pullRequestNumbersInCommits(commits) {
return commits.reduce((array, {pullRequestId}) => {
if (pullRequestId) {
array.push(pullRequestId);
}
return array;
}, []);
}
// Given 2 arrays of annotated commits and pull requests, replace merge commits
// with the pull request information, and remove commits that are already part
// of a pull request.
// The goal of this function is to return an array consisting only of pull
// requests + commits that have been made to `master` directly.
function combine(allCommits, allPullRequests) {
const commitsFromPRs = _.flatMap(allPullRequests, ({commits}) =>
commits.nodes.map(({commit}) => commit.oid)
);
return allCommits.reduce((array, commit) => {
if (commit.pullRequestId) {
const pullRequest = allPullRequests[`PR${commit.pullRequestId}`];
pullRequest.number = commit.pullRequestId;
array.push(pullRequest);
} else if (!commitsFromPRs.includes(commit.oid)) {
array.push(commit);
}
return array;
}, []);
}
// Builds a Markdown link for a given author object
function printAuthorLink({login, url}) {
return `by [@${login}](${url})`;
}
// Builds a Markdown link for a given pull request or commit object
function printEntryLink(entry) {
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const label =
entry.__typename === "PullRequest" ? `#${entry.number}` : `\`${entry.abbreviatedOid}\``;
return `[${label}](${entry.url})`;
}
// Builds a Markdown entry list item depending on its type
function printLine(entry) {
if (entry.__typename === "PullRequest") {
return printPullRequest(entry);
}
return printCommit(entry);
}
// Builds a Markdown list item for a given pull request
function printPullRequest(pullRequest) {
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return `- ${pullRequest.title} (${printEntryLink(pullRequest)} ${printAuthorLink(
pullRequest.author
)})`;
}
// Builds a Markdown list item for a commit made directly in `master`
function printCommit(commit) {
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return `- ${commit.messageHeadline} (${printEntryLink(commit)} ${printAuthorLink(
commit.author.user
)})`;
}
// Builds a Markdown list of all given items
function printList(items) {
return items.map((item) => printLine(item)).join("\n");
}
// Given a "dependencies object" (i.e. keys are package names, values are arrays
// of pull request numbers), builds a Markdown list of URLs
function printDependencyList(dependencies) {
const list = [];
Object.entries(dependencies).forEach(([name, entries]) => {
if (entries.length > 0) {
list.push(` - \`${name}\` (${entries.map(printEntryLink).join(", ")})`);
}
});
return list.join("\n");
}
function printUncategorizedList(uncategorized) {
return Object.entries(uncategorized).reduce((memo, [label, items]) => {
if (items.length === 0) {
return memo;
}
memo += `
@@@@@ ${label.toUpperCase()}
${printList(items)}
`;
return memo;
}, "");
}
const dependencies = Object.keys(packageJson.dependencies);
const devDependencies = Object.keys(packageJson.devDependencies);
const optionalDependencies = Object.keys(packageJson.optionalDependencies);
// Returns the package.json section in which that package exists, or undefined
// if that package is not listed there.
function whichDependencyType(packageName) {
if (dependencies.includes(packageName) || optionalDependencies.includes(packageName)) {
return "dependencies";
} else if (devDependencies.includes(packageName)) {
return "devDependencies";
}
}
function hasLabelOrAnnotatedComment({labels, comments}, expected) {
return hasLabel(labels, expected) || hasAnnotatedComment(comments, expected);
}
// Returns true if a label exists amongst a list of labels
function hasLabel(labels, expected) {
return labels && labels.nodes.some(({name}) => name === expected);
}
function hasAnnotatedComment(comments, expected) {
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return (
comments &&
comments.nodes.some(
({authorAssociation, body}) =>
["OWNER", "MEMBER"].includes(authorAssociation) &&
body.split("\r\n").includes(`[${expected}]`)
)
);
}
function isSkipped(entry) {
return (
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(entry.__typename === "Commit" &&
// Version bump commits created by `yarn version`
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(isValidVersion(entry.messageHeadline) ||
// Commit message suggested by this script
entry.messageHeadline.startsWith("Add changelog entry for v"))) ||
hasLabelOrAnnotatedComment(entry, "Meta: Skip Changelog")
);
}
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// Dependency update PRs are listed in a special, more concise way in the changelog.
function isDependency({labels}) {
return hasLabel(labels, "Type: Dependencies");
}
function isDocumentation({labels}) {
return hasLabel(labels, "Type: Documentation");
}
function isSecurity({labels}) {
return hasLabel(labels, "Type: Security");
}
function isDeprecation({labels}) {
return hasLabel(labels, "Type: Deprecation");
}
function isInternal(entry) {
return hasLabelOrAnnotatedComment(entry, "Meta: Internal");
}
function isBug({labels}) {
return hasLabel(labels, "Type: Bug");
}
function isFeature({labels}) {
return hasLabel(labels, "Type: Feature");
}
// Examples:
// Update webpack to the latest version
// Update `stylelint` to v1.2.3
// Update `express` and `ua-parser-js` to latest versions
// Update `express`, `chai`, and `ua-parser-js` to ...
// Update @fortawesome/fontawesome-free-webfonts to the latest version
// Update dependency request to v2.87.0
// chore(deps): update dependency mini-css-extract-plugin to v0.4.3
// fix(deps): update dependency web-push to v3.3.3
// chore(deps): update babel monorepo to v7.1.0
function extractPackages({title, url}) {
const extracted = /(?:U|u)pdate(?: dependency)? ([\w-,` ./@]+?) (?:monorepo )?to /.exec(title);
if (!extracted) {
log.warn(`Failed to extract package from: ${title} ${colors.gray(url)}`);
return [];
}
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return extracted[1].replace(/`/g, "").split(/, and |, | and /);
}
// Given an array of entries (PRs or commits), separates them into sections,
// based on different information that describes them.
function parse(entries) {
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return entries.reduce(
(result, entry) => {
let deps;
if (isSkipped(entry)) {
result.skipped.push(entry);
} else if (isDependency(entry) && (deps = extractPackages(entry))) {
deps.forEach((packageName) => {
const dependencyType = whichDependencyType(packageName);
if (dependencyType) {
if (!result[dependencyType][packageName]) {
result[dependencyType][packageName] = [];
}
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result[dependencyType][packageName].push(entry);
} else {
log.info(
`${colors.bold(packageName)} was updated in ${colors.green(
"#" + entry.number
)} then removed since last release. Skipping. ${colors.gray(
entry.url
)}`
);
}
});
} else if (isDocumentation(entry)) {
result.documentation.push(entry);
} else if (isDeprecation(entry)) {
result.deprecations.push(entry);
} else if (isSecurity(entry)) {
result.security.push(entry);
} else if (isInternal(entry)) {
result.internals.push(entry);
} else {
if (isFeature(entry)) {
result.uncategorized.feature.push(entry);
} else if (isBug(entry)) {
result.uncategorized.bug.push(entry);
} else {
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result.uncategorized.other.push(entry);
}
}
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return result;
},
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{
skipped: [],
dependencies: {},
devDependencies: {},
deprecations: [],
documentation: [],
internals: [],
security: [],
uncategorized: {
feature: [],
bug: [],
other: [],
},
unknownDependencies: new Set(),
}
);
}
function dedupeEntries(changelog, items) {
const dedupe = (entries) =>
entries.filter((entry) => !changelog.includes(printEntryLink(entry)));
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["deprecations", "documentation", "websiteDocumentation", "internals", "security"].forEach(
(type) => {
items[type] = dedupe(items[type]);
}
);
["dependencies", "devDependencies", "uncategorized"].forEach((type) => {
Object.entries(items[type]).forEach(([name, entries]) => {
items[type][name] = dedupe(entries);
});
});
}
// Given a list of entries (pull requests, commits), retrieves GitHub usernames
// (with format `@username`) of everyone who contributed to this version.
function extractContributors(entries) {
const set = Object.values(entries).reduce((memo, {__typename, author}) => {
if (__typename === "PullRequest" && author.__typename !== "Bot") {
memo.add("@" + author.login);
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// Commit authors are *always* of type "User", so have to discriminate some
// other way. Making the assumption of a suffix for now, see how that goes.
} else if (__typename === "Commit" && !author.user.login.endsWith("-bot")) {
memo.add("@" + author.user.login);
}
return memo;
}, new Set());
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return Array.from(set).sort((a, b) => a.localeCompare(b, "en", {sensitivity: "base"}));
}
const client = new GraphQLClient("https://api.github.com/graphql", {
headers: {
Authorization: `bearer ${token}`,
},
});
// Main function. Given a version string (i.e. not a tag!), returns a changelog
// entry and the list of contributors, for both pre-releases and stable
// releases. Templates are located at the top of this file.
async function generateChangelogEntry(changelog, targetVersion) {
let items = {};
let template;
let contributors = [];
const codeRepo = new RepositoryFetcher(client, "thelounge");
const previousVersion = await codeRepo.fetchPreviousVersion(targetVersion);
if (isPrerelease(targetVersion)) {
template = prereleaseTemplate;
} else {
template = stableTemplate;
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const codeCommitsAndPullRequests = await codeRepo.fetchCommitsAndPullRequestsSince(
"v" + previousVersion
);
items = parse(codeCommitsAndPullRequests);
items.milestone = await codeRepo.fetchMilestone(targetVersion);
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const websiteRepo = new RepositoryFetcher(client, "thelounge.github.io");
const previousWebsiteVersion = await websiteRepo.fetchPreviousVersion(targetVersion);
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const websiteCommitsAndPullRequests = await websiteRepo.fetchCommitsAndPullRequestsSince(
"v" + previousWebsiteVersion
);
items.websiteDocumentation = websiteCommitsAndPullRequests;
contributors = extractContributors([
...codeCommitsAndPullRequests,
...websiteCommitsAndPullRequests,
]);
dedupeEntries(changelog, items);
}
items.version = targetVersion;
items.date = moment().format("YYYY-MM-DD");
items.fullChangelogUrl = fullChangelogUrl(previousVersion, targetVersion);
return {
changelogEntry: template(items),
skipped: items.skipped || [],
contributors,
};
}
// Write a changelog entry into the CHANGELOG.md file, right after a marker that
// indicates where entries are listed.
function addToChangelog(changelog, newEntry) {
const changelogMarker = "<!-- New entries go after this line -->\n\n";
const markerPosition = changelog.indexOf(changelogMarker) + changelogMarker.length;
const newChangelog =
changelog.substring(0, markerPosition) +
newEntry +
changelog.substring(markerPosition, changelog.length);
writeFile(changelogPath, newChangelog);
}
// Wrapping this in an Async IIFE because async/await is only supported within
// functions. ¯\_(ツ)_/¯
(async () => {
log.info(`Generating a changelog entry for ${colors.bold("v" + version)}, please wait...`);
const startTime = Date.now();
let changelogEntry, skipped, contributors;
// Step 1: Generate a changelog entry
const changelog = await readFile(changelogPath, "utf8");
try {
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({changelogEntry, skipped, contributors} = await generateChangelogEntry(
changelog,
version
));
} catch (error) {
if (error.response && error.response.status === 401) {
log.error(`GitHub returned an error: ${colors.red(error.response.message)}`);
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log.error(
`Make sure your personal access token is set with ${colors.bold(
"public_repo"
)} scope.`
);
} else {
log.error(error);
}
process.exit(1);
}
// Step 2: Write that changelog entry into the CHANGELOG.md file
try {
await addToChangelog(changelog, `${changelogEntry.trim()}\n\n`);
} catch (error) {
log.error(error);
process.exit(1);
}
log.info(`The generated entry was added at the top of ${colors.bold("CHANGELOG.md")}.`);
// Step 3 (optional): Print a list of skipped entries if there are any
if (skipped.length > 0) {
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const pad = Math.max(
...skipped.map((entry) => (entry.title || entry.messageHeadline).length)
);
log.warn(`${skipped.length} ${skipped.length > 1 ? "entries were" : "entry was"} skipped:`);
skipped.forEach((entry) => {
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log.warn(
`- ${(entry.title || entry.messageHeadline).padEnd(pad)} ${colors.gray(entry.url)}`
);
});
}
// Step 4: Print out some information about what just happened to the console
const commitCommand = `git commit -m 'Add changelog entry for v${version}' CHANGELOG.md`;
if (isPrerelease(version)) {
log.info(`You can now run: ${colors.bold(commitCommand)}`);
} else {
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log.info(
`Please edit ${colors.bold("CHANGELOG.md")} to your liking then run: ${colors.bold(
commitCommand
)}`
);
}
log.info(`Finished in ${colors.bold(Date.now() - startTime)}ms.`);
// Step 5 (optional): Print contributors shout out if it exists
if (contributors.length > 0) {
log.info(`🎉 Thanks to our ${contributors.length} contributors for this release:`);
log.info(contributors.map((contributor) => colors.green(contributor)).join(", "));
}
})();