Merge pull request #116 from liferay/wincent/easier-dry-run

feat(changelog-generator): make --version optional when --dry-run is on

projects/npm-tools/packages/changelog-generator/src/index.js

@@ -510,7 +510,7 @@ async function normalizeVersion(version, {force}, versionTagPrefix) {
 	return version;
 }
 
-function parseArgs(args) {
+async function parseArgs(args) {
 	const options = {
 		dryRun: false,
 		outfile: './CHANGELOG.md',
@@ -595,9 +595,19 @@ function parseArgs(args) {
 	});
 
 	if (!options.version) {
-		error('Missing required option: --version; see --help for usage');
+		if (options.dryRun) {
+			const prefix = await getVersionTagPrefix();
 
-		return null;
+			const version = `${prefix}0.0.0-placeholder`;
+
+			info(`Using phony version ${version} during --dry-run`);
+
+			options.version = version;
+		} else {
+			error('Missing required option: --version; see --help for usage');
+
+			return null;
+		}
 	}
 
 	return options;
@@ -692,12 +702,6 @@ async function getVersionTagPrefix() {
 }
 
 async function main(_node, _script, ...args) {
-	const options = parseArgs(args);
-	if (!options) {
-		process.exit(1);
-	}
-	const {outfile, to, updateTags} = options;
-
 	printBanner(`
 		changelog.js
 		============
@@ -706,6 +710,14 @@ async function main(_node, _script, ...args) {
 		for duty!
 	`);
 
+	const options = await parseArgs(args);
+
+	if (!options) {
+		process.exit(1);
+	}
+
+	const {outfile, to, updateTags} = options;
+
 	if (updateTags) {
 		try {
 			info('Fetching remote tags: run with --no-update-tags to skip');