feat: apply .ignores to lintText

- add multimatch-powered short-circuit to `lintText`
- add supporting test cases
- closes #168

index.js

@@ -2,16 +2,35 @@
 const path = require('path');
 const eslint = require('eslint');
 const globby = require('globby');
+const multimatch = require('multimatch');
 const optionsManager = require('./options-manager');
 
 exports.lintText = (str, opts) => {
 	opts = optionsManager.preprocess(opts);
 
+	if (opts.cwd && opts.filename) {
+		const filename = path.relative(opts.cwd, opts.filename);
+
+		if (multimatch([filename], opts.ignores)) {
+			return {
+				errorCount: 0,
+				warningCount: 0,
+				results: [{
+					errorCount: 0,
+					filePath: filename,
+					messages: [],
+					warningCount: 0
+				}]
+			};
+		}
+	}
+
 	if (opts.overrides && opts.overrides.length > 0) {
 		const overrides = opts.overrides;
 		delete opts.overrides;
 
 		const filename = path.relative(opts.cwd, opts.filename);
+
 		const foundOverrides = optionsManager.findApplicableOverrides(filename, overrides);
 		opts = optionsManager.mergeApplicableOverrides(opts, foundOverrides.applicable);
 	}

test/api.js

@@ -20,6 +20,33 @@ test('.lintText() - `esnext` option', t => {
 	t.true(hasRule(results, 'no-var'));
 });
 
+test('.lintText() - `ignores` option', t => {
+	const result = fn.lintText(`'use strict'\nconsole.log('unicorn');\n`, {
+		cwd: process.cwd(),
+		filename: 'ignored/index.js',
+		ignores: ['ignored/**/*.js']
+	});
+	t.is(result.errorCount, 0);
+	t.is(result.warningCount, 0);
+});
+
+test('.lintText() - `ignores` option without cwd', t => {
+	const result = fn.lintText(`'use strict'\nconsole.log('unicorn');\n`, {
+		filename: 'ignored/index.js',
+		ignores: ['ignored/**/*.js']
+	});
+	t.is(result.errorCount, 0);
+	t.is(result.warningCount, 0);
+});
+
+test('.lintText() - `ignores` option without filename', t => {
+	const result = fn.lintText(`'use strict'\nconsole.log('unicorn');\n`, {
+		ignores: ['ignored/**/*.js']
+	});
+	t.is(result.errorCount, 1);
+	t.is(result.warningCount, 0);
+});
+
 test('.lintText() - JSX support', t => {
 	const results = fn.lintText('var app = <div className="appClass">Hello, React!</div>;\n', {esnext: false}).results;
 	t.true(hasRule(results, 'no-unused-vars'));