Initial implementation, tests, readme

.eslintrc

@@ -0,0 +1,13 @@
+{
+	"root": true,
+
+	"extends": "@ljharb/eslint-config/node/20",
+
+	"rules": {
+		"complexity": "off",
+		"max-lines-per-function": "off",
+		"max-statements": "off",
+		"no-magic-numbers": "off",
+		"sort-keys": "off",
+	},
+}

.github/FUNDING.yml

@@ -0,0 +1,12 @@
+# These are supported funding model platforms
+
+github: [ljharb]
+patreon: # Replace with a single Patreon username
+open_collective: # Replace with a single Open Collective username
+ko_fi: # Replace with a single Ko-fi username
+tidelift: npm/@ljharb/coauthors
+community_bridge: # Replace with a single Community Bridge project-name e.g., cloud-foundry
+liberapay: # Replace with a single Liberapay username
+issuehunt: # Replace with a single IssueHunt username
+otechie: # Replace with a single Otechie username
+custom: # Replace with up to 4 custom sponsorship URLs e.g., ['link1', 'link2']

.github/workflows/node-pretest.yml

@@ -0,0 +1,7 @@
+name: 'Tests: pretest/posttest'
+
+on: [pull_request, push]
+
+jobs:
+  tests:
+    uses: ljharb/actions/.github/workflows/pretest.yml@main

.github/workflows/node.yml

@@ -0,0 +1,11 @@
+name: 'Tests: node.js >= 22.4'
+
+on: [pull_request, push]
+
+jobs:
+  tests:
+    uses: ljharb/actions/.github/workflows/node.yml@main
+    with:
+      range: '>= 22.4'
+      type: minors
+      command: npm run tests-only

.github/workflows/rebase.yml

@@ -0,0 +1,9 @@
+name: Automatic Rebase
+
+on: [pull_request_target]
+
+jobs:
+  _:
+    uses: ljharb/actions/.github/workflows/rebase.yml@main
+    secrets:
+      token: ${{ secrets.GITHUB_TOKEN }}

.github/workflows/require-allow-edits.yml

@@ -0,0 +1,12 @@
+name: Require “Allow Edits”
+
+on: [pull_request_target]
+
+jobs:
+  _:
+    name: "Require “Allow Edits”"
+
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: ljharb/require-allow-edits@main

.gitignore

@@ -133,3 +133,5 @@ dist
 npm-shrinkwrap.json
 package-lock.json
 yarn.lock
+
+.npmignore

README.md

@@ -1,2 +1,52 @@
-# coauthors
+# @ljharb/coauthors <sup>[![Version Badge][npm-version-svg]][package-url]</sup>
+
+[![github actions][actions-image]][actions-url]
+[![coverage][codecov-image]][codecov-url]
+[![License][license-image]][license-url]
+[![Downloads][downloads-image]][downloads-url]
+
+[![npm badge][npm-badge-png]][package-url]
+
 A cli to generate a complete git co-authors list, including existing co-authors, for use in a commit message.
+
+## Usage
+
+```sh
+npx @ljharb/coauthors # if not installed
+
+coauthors # if installed and in the PATH
+```
+
+```sh
+$ coauthors --help
+Usage:
+commit-to-co-authors <remote>
+
+`remote` defaults to `origin`.
+```
+
+## Install
+
+```
+npm install --save-dev @ljharb/coauthors
+```
+
+## License
+
+MIT
+
+[package-url]: https://npmjs.org/package/@ljharb/coauthors
+[npm-version-svg]: https://versionbadg.es/ljharb/coauthors.svg
+[deps-svg]: https://david-dm.org/ljharb/coauthors.svg
+[deps-url]: https://david-dm.org/ljharb/coauthors
+[dev-deps-svg]: https://david-dm.org/ljharb/coauthors/dev-status.svg
+[dev-deps-url]: https://david-dm.org/ljharb/coauthors#info=devDependencies
+[npm-badge-png]: https://nodei.co/npm/@ljharb/coauthors.png?downloads=true&stars=true
+[license-image]: https://img.shields.io/npm/l/@ljharb/coauthors.svg
+[license-url]: LICENSE
+[downloads-image]: https://img.shields.io/npm/dm/@ljharb/coauthors.svg
+[downloads-url]: https://npm-stat.com/charts.html?package=@ljharb/coauthors
+[codecov-image]: https://codecov.io/gh/ljharb/coauthors/branch/main/graphs/badge.svg
+[codecov-url]: https://app.codecov.io/gh/ljharb/coauthors/
+[actions-image]: https://img.shields.io/endpoint?url=https://github-actions-badge-u3jn4tfpocch.runkit.sh/ljharb/coauthors
+[actions-url]: https://github.com/ljharb/coauthors/actions

bin.mjs

@@ -0,0 +1,52 @@
+#! /usr/bin/env node
+
+import { readFile } from 'fs/promises';
+import path from 'path';
+
+import validateRemote from './validateRemote.mjs';
+import getResults from './results.mjs';
+
+import pargs from './pargs.mjs';
+
+async function getHelpText() {
+	return `${await readFile(path.join(import.meta.dirname, './help.txt'), 'utf-8')}`;
+}
+
+const {
+	values: { help },
+	positionals,
+	errors,
+} = await pargs(
+	import.meta.filename,
+	{
+		options: {
+			help: { type: 'boolean' },
+		},
+		allowPositionals: 1,
+	},
+);
+
+const remote = validateRemote(positionals[0] ?? 'origin');
+
+if (typeof remote !== 'string') {
+	errors.push(remote.error);
+}
+
+if (help || errors.length > 0) {
+	const helpText = await getHelpText();
+	if (errors.length === 0) {
+		console.log(helpText);
+	} else {
+		console.error(`${helpText}${errors.length === 0 ? '' : '\n'}`);
+
+		process.exitCode ||= parseInt('1'.repeat(errors.length), 2);
+		errors.forEach((error) => console.error(error));
+	}
+
+	process.exit();
+}
+
+// eslint-disable-next-line no-extra-parens
+const results = Array.from(getResults(/** @type {string} */ (remote)), (x) => `Co-authored-by: ${x}`);
+
+console.log(results.join('\n'));

getDefaultBranch.mjs

@@ -0,0 +1,10 @@
+import { execSync } from 'child_process';
+
+/** @type {(remote: string) => string} */
+export default function getDefaultBranch(remote) {
+	const gitResult = `${execSync(`git rev-parse --abbrev-ref ${remote}/HEAD`)}`.trim();
+
+	const match = (/\/(?<defaultBranch>\S+)$/).exec(gitResult);
+
+	return match?.groups?.defaultBranch ?? 'main';
+}

help.txt

@@ -0,0 +1,4 @@
+Usage:
+commit-to-co-authors <remote>
+
+`remote` defaults to `origin`.

package.json

@@ -2,8 +2,23 @@
 	"name": "@ljharb/coauthors",
 	"version": "0.0.0",
 	"description": "A cli to generate a complete git co-authors list, including existing co-authors, for use in a commit message.",
+	"bin": "./bin.mjs",
+	"exports": {
+		"./package.json": "./package.json"
+	},
+	"sideEffects": false,
 	"scripts": {
-		"test": "echo \"Error: no test specified\" && exit 1"
+		"prepack": "npmignore --auto --commentLines=autogenerated",
+		"prepublish": "not-in-publish || npm run prepublishOnly",
+		"prepublishOnly": "safe-publish-latest",
+		"lint": "eslint --ext=js,mjs .",
+		"postlint": "tsc",
+		"pretest": "npm run lint",
+		"tests-only": "c8 tape 'test/**/*.*js'",
+		"test": "npm run tests-only",
+		"posttest": "aud --production",
+		"version": "auto-changelog && git add CHANGELOG.md",
+		"postversion": "auto-changelog && git add CHANGELOG.md && git commit --no-edit --amend && git tag -f \"v$(node -e \"console.log(require('./package.json').version)\")\""
 	},
 	"repository": {
 		"type": "git",
@@ -21,5 +36,54 @@
 	"bugs": {
 		"url": "https://github.com/ljharb/coauthors/issues"
 	},
-	"homepage": "https://github.com/ljharb/coauthors#readme"
+	"homepage": "https://github.com/ljharb/coauthors#readme",
+	"dependencies": {
+		"commit-to-co-authors": "^0.1.0"
+	},
+	"engines": {
+		"node": ">= 22.4"
+	},
+	"devDependencies": {
+		"@ljharb/eslint-config": "^21.1.1",
+		"@ljharb/tsconfig": "^0.2.0",
+		"@types/node": "^20.14.10",
+		"@types/tape": "^5.6.4",
+		"aud": "^2.0.4",
+		"auto-changelog": "^2.4.0",
+		"c8": "^10.1.2",
+		"eslint": "^8.8.0",
+		"esmock": "^2.6.6",
+		"in-publish": "^2.0.1",
+		"npmignore": "^0.3.1",
+		"safe-publish-latest": "^2.0.0",
+		"tape": "^5.8.1",
+		"typescript": "next"
+	},
+	"c8": {
+		"all": true,
+		"reporters": [
+			"html",
+			"text",
+			"lcov"
+		],
+		"exclude": [
+			"coverage",
+			"./pargs.mjs"
+		]
+	},
+	"auto-changelog": {
+		"output": "CHANGELOG.md",
+		"template": "keepachangelog",
+		"unreleased": false,
+		"commitLimit": false,
+		"backfillLimit": false,
+		"hideCredit": true
+	},
+	"publishConfig": {
+		"ignore": [
+			".github/workflows",
+			".eslintrc",
+			"test"
+		]
+	}
 }

pargs.mjs

@@ -0,0 +1,119 @@
+import { parseArgs } from 'util';
+import { realpathSync } from 'fs';
+
+/** @typedef {import('util').ParseArgsConfig} ParseArgsConfig */
+
+/** @typedef {(Error | TypeError) & { code: 'ERR_PARSE_ARGS_UNKNOWN_OPTION' | 'ERR_PARSE_ARGS_INVALID_OPTION_VALUE' | 'ERR_INVALID_ARG_TYPE' | 'ERR_INVALID_ARG_VALUE' | 'ERR_PARSE_ARGS_UNEXPECTED_POSITIONAL'}} ParseArgsError */
+
+/** @type {(e: unknown) => e is ParseArgsError} */
+function isParseArgsError(e) {
+	return !!e
+		&& typeof e === 'object'
+		&& 'code' in e
+		&& (
+			e.code === 'ERR_PARSE_ARGS_UNKNOWN_OPTION'
+			|| e.code === 'ERR_PARSE_ARGS_INVALID_OPTION_VALUE'
+			|| e.code === 'ERR_INVALID_ARG_TYPE'
+			|| e.code === 'ERR_INVALID_ARG_VALUE'
+			|| e.code === 'ERR_PARSE_ARGS_UNEXPECTED_POSITIONAL'
+		);
+}
+/** @typedef {Omit<ParseArgsConfig, 'args' | 'strict' | 'allowPositionals'> & { allowPositionals?: boolean | number }} PargsConfig */
+
+/** @type {(entrypointPath: ImportMeta['filename'], obj: PargsConfig) => Promise<{ errors: string[] } & ReturnType<typeof parseArgs>>} */
+export default async function pargs(entrypointPath, obj) {
+	const argv = process.argv.flatMap((arg) => {
+		try {
+			const realpathedArg = realpathSync(arg);
+			if (
+				realpathedArg === process.execPath
+				|| realpathedArg === entrypointPath
+			) {
+				return [];
+			}
+		} catch (e) { /**/ }
+		return arg;
+	});
+
+	if ('help' in obj) {
+		throw new TypeError('The "help" option is reserved');
+	}
+
+	/** @type {ParseArgsConfig & { tokens: true }} */
+	const newObj = {
+		args: argv,
+		...obj,
+		options: {
+			...obj.options,
+			help: {
+				default: false,
+				type: 'boolean',
+			},
+		},
+		tokens: true,
+		// @ts-expect-error blocked on @types/node v22
+		allowNegative: true,
+		allowPositionals: typeof obj.allowPositionals !== 'undefined',
+		strict: true,
+	};
+
+	const errors = [];
+
+	try {
+		const { tokens, ...results } = parseArgs(newObj);
+
+		const posCount = typeof obj.allowPositionals === 'number' ? obj.allowPositionals : obj.allowPositionals ? Infinity : 0;
+		if (results.positionals.length > posCount) {
+			errors.push(`Only ${posCount} positional arguments allowed; got ${results.positionals.length}`);
+		}
+
+		/** @typedef {Extract<typeof tokens[number], { kind: 'option' }>} OptionToken */
+		const optionTokens = tokens.filter(/** @type {(token: typeof tokens[number]) => token is OptionToken} */ (token) => token.kind === 'option');
+
+		const bools = obj.options ? Object.entries(obj.options).filter(([, { type }]) => type === 'boolean') : [];
+		const boolMap = new Map(bools);
+		for (let i = 0; i < optionTokens.length; i += 1) {
+			const { name, value } = optionTokens[i];
+			if (boolMap.has(name) && typeof value !== 'boolean' && typeof value !== 'undefined') {
+				errors.push(`Error: Argument --${name} must be a boolean`);
+			}
+		}
+
+		const passedArgs = new Set(optionTokens.map(({ name, rawName }) => (rawName === '--no-help' ? rawName : name)));
+
+		const groups = Object.groupBy(passedArgs, (x) => x.replace(/^no-/, ''));
+		for (let i = 0; i < bools.length; i++) {
+			const [key] = bools[i];
+			if ((groups[key]?.length ?? 0) > 1) {
+				errors.push(`Error: Arguments \`--${key}\` and \`--no-${key}\` are mutually exclusive`);
+			}
+			if (passedArgs.has(`no-${key}`)) {
+				// @ts-expect-error
+				results.values[key] = !results.values[`no-${key}`];
+			}
+			// @ts-expect-error
+			delete results.values[`no-${key}`];
+		}
+
+		const knownOptions = obj.options ? Object.keys(obj.options) : [];
+		const unknownArgs = knownOptions.length > 0 ? passedArgs.difference(new Set(knownOptions)) : passedArgs;
+		if (unknownArgs.size > 0) {
+			errors.push(`Error: Unknown option(s): ${Array.from(unknownArgs, (x) => `\`${x}\``).join(', ')}`);
+		}
+
+		return {
+			errors,
+			...results,
+			...obj.tokens && { tokens },
+		};
+	} catch (e) {
+		if (isParseArgsError(e)) {
+			return {
+				values: {},
+				positionals: [],
+				errors: [`Error: ${e.message}`],
+			};
+		}
+		throw e;
+	}
+}