Add confirmation message when no previous commits are found - fixes #242

 (#245)

lib/ui.js

@@ -31,6 +31,10 @@ function printCommitLog(repositoryUrl) {
 	return execa.stdout('git', ['rev-list', `--tags`, '--max-count=1'])
 		.then(latestHash => execa.stdout('git', ['log', '--format=%s %h', `${latestHash}..HEAD`]))
 		.then(result => {
+			if (!result) {
+				return false;
+			}
+
 			const history = result.split('\n')
 				.map(commit => {
 					const commitParts = commit.match(/^(.+)\s([a-f\d]{7})$/);
@@ -43,6 +47,8 @@ function printCommitLog(repositoryUrl) {
 				.join('\n');
 
 			console.log(`${chalk.bold('Commits:')}\n${history}\n`);
+
+			return true;
 		});
 }
 
@@ -145,6 +151,22 @@ module.exports = options => {
 	];
 
 	return printCommitLog(repositoryUrl)
-		.then(() => inquirer.prompt(prompts))
+		.then(hasCommits => {
+			if (!hasCommits) {
+				return inquirer.prompt([{
+					type: 'confirm',
+					name: 'confirm',
+					message: 'No commits found since previous release, continue?',
+					default: false
+				}]);
+			}
+		})
+		.then(answers => {
+			if (answers && !answers.confirm) {
+				return answers;
+			}
+
+			return inquirer.prompt(prompts);
+		})
 		.then(answers => Object.assign({}, options, answers));
 };