Group unpublished files in folders

source/ui.js

@@ -93,7 +93,7 @@ const checkNewFilesAndDependencies = async (pkg, rootDir) => {
 
 	const messages = [];
 	if (newFiles.unpublished.length > 0) {
-		messages.push(`The following new files will not be part of your published package:\n${util.joinList(newFiles.unpublished)}\n\nIf you intended to publish them, add them to the \`files\` field in package.json.`);
+		messages.push(`The following new files will not be part of your published package:\n${util.groupFilesInFolders(newFiles.unpublished)}\n\nIf you intended to publish them, add them to the \`files\` field in package.json.`);
 	}
 
 	if (newFiles.firstTime.length > 0) {

source/util.js

@@ -76,6 +76,28 @@ export const getTagVersionPrefix = pMemoize(async options => {
 
 export const joinList = list => chalk.reset(list.map(item => `- ${item}`).join('\n'));
 
+export const groupFilesInFolders = (files, groupingMinimumDepth = 1, groupingThresholdCount = 5) => {
+	const groups = {};
+	for (const file of files) {
+		const groupKey = path.join(...file.split(path.sep).slice(0, groupingMinimumDepth));
+		groups[groupKey] = [...groups[groupKey] ?? [], file];
+	}
+
+	const lines = [];
+	for (const [folder, filesInFolder] of Object.entries(groups)) {
+		if (filesInFolder.length > groupingThresholdCount) {
+			lines.push(`- ${folder}/* ${chalk.bold.white(`(${filesInFolder.length} files)`)}`);
+			continue;
+		}
+
+		for (const file of filesInFolder) {
+			lines.push(`- ${file}`);
+		}
+	}
+
+	return chalk.reset(lines.join('\n'));
+};
+
 export const getNewFiles = async rootDir => {
 	const listNewFiles = await git.newFilesSinceLastRelease(rootDir);
 	const listPkgFiles = await npm.getFilesToBePacked(rootDir);

test/util/auto-group-list.js

@@ -0,0 +1,33 @@
+import test from 'ava';
+import stripAnsi from 'strip-ansi';
+import {groupFilesInFolders} from '../../source/util.js';
+
+const testJoinList = test.macro((t, {list, expected}) => {
+	const output = groupFilesInFolders(list);
+	t.is(stripAnsi(output), expected);
+});
+
+test('one item', testJoinList, {
+	list: [
+		'scripts/a.sh',
+	],
+	expected: '- scripts/a.sh',
+});
+
+test('mix of collapsed and expanded folders', testJoinList, {
+	list: [
+		'scripts/a.sh',
+		'scripts/b.sh',
+		'scripts/c.sh',
+		'test/_utils-1.js',
+		'test/_utils-2.js',
+		'test/_utils-3.js',
+		'test/_utils-4.js',
+		'test/_utils-5.js',
+		'test/_utils-6.js',
+	],
+	expected: `- scripts/a.sh
+- scripts/b.sh
+- scripts/c.sh
+- test/* (6 files)`,
+});