add --quiet feature (#131)

cli.js

@@ -42,6 +42,7 @@ var cli = meow({
 		'  --plugin        Include third-party plugins  [Can be set multiple times]',
 		'  --extend        Extend defaults with a custom config  [Can be set multiple times]',
 		'  --open          Open files with issues in your editor',
+		'  --quiet         Show only errors and no warnings',
 		'',
 		'Examples',
 		'  $ xo',

index.js

@@ -9,8 +9,9 @@ exports.lintText = function (str, opts) {
 	opts = optionsManager.buildConfig(opts);
 
 	var engine = new eslint.CLIEngine(opts);
+	var report = engine.executeOnText(str, opts.filename);
 
-	return engine.executeOnText(str, opts.filename);
+	return processReport(report, opts);
 };
 
 exports.lintFiles = function (patterns, opts) {
@@ -64,7 +65,14 @@ function mergeReports(reports) {
 function runEslint(paths, opts) {
 	var config = optionsManager.buildConfig(opts);
 	var engine = new eslint.CLIEngine(config);
-	return engine.executeOnFiles(paths, config);
+	var report = engine.executeOnFiles(paths, config);
+
+	return processReport(report, opts);
+}
+
+function processReport(report, opts) {
+	report.results = opts.quiet ? eslint.CLIEngine.getErrorResults(report.results) : report.results;
+	return report;
 }
 
 exports.getFormatter = eslint.CLIEngine.getFormatter;

readme.md

@@ -48,6 +48,7 @@ $ xo --help
     --plugin        Include third-party plugins  [Can be set multiple times]
     --extend        Extend defaults with a custom config  [Can be set multiple times]
     --open          Open files with issues in your editor
+    --quiet         Show only errors and no warnings
 
   Examples
     $ xo

test/cli.js

@@ -37,3 +37,9 @@ test('supports being extended with a shareable config', async () => {
 	const cwd = path.join(__dirname, 'fixtures/project');
 	await execa('../../../cli.js', ['--no-local'], {cwd});
 });
+
+test('quiet option', async t => {
+	const filepath = await tempWrite('// TODO: quiet\nconsole.log()\n', 'x.js');
+	const err = await t.throws(execa('../cli.js', ['--no-local', '--quiet', '--reporter=compact', filepath]));
+	t.is(err.stdout.indexOf('warning'), -1);
+});