Update --ignore for directories so it ignores all files within rather…

… than just those with .md or .markdown (case-sensitive) extensions (fixes #459).

markdownlint.js

@@ -91,7 +91,10 @@ function prepareFileList(files, fileExtensions, previousResults) {
     nodir: true
   };
   let extensionGlobPart = '*.';
-  if (fileExtensions.length === 1) {
+  if (!fileExtensions) {
+    // Match everything
+    extensionGlobPart = '';
+  } else if (fileExtensions.length === 1) {
     // Glob seems not to match patterns like 'foo.{js}'
     extensionGlobPart += fileExtensions[0];
   } else {
@@ -267,7 +270,7 @@ if (existsSync(ignorePath)) {
 }
 
 const files = prepareFileList(program.args, ['md', 'markdown']).filter(value => ignoreFilter(value));
-const ignores = prepareFileList(options.ignore, ['md', 'markdown'], files);
+const ignores = prepareFileList(options.ignore, null, files);
 const customRules = loadCustomRules(options.rules);
 const diff = files.filter(file => !ignores.some(ignore => ignore.absolute === file.absolute)).map(paths => paths.original);
 

test/subdir-incorrect/UPPER.MD

@@ -0,0 +1,26 @@
+## header 2
+# header
+
+```fence
+$ code
+```
+
+text
+
+```fence
+$ code
+```
+
+text
+
+```fence
+$ code
+```
+
+text
+
+```fence
+$ code
+```
+
+text

test/test.js

@@ -262,6 +262,13 @@ test('glob linting with failing files passes when ignored by multiple globs', as
   t.is(result.exitCode, 0);
 });
 
+test('glob linting with directory ignore applies to all files within', async t => {
+  const result = await execa('../markdownlint.js', ['subdir-incorrect/**', '--ignore', 'subdir-incorrect'], {stripFinalNewline: false});
+  t.is(result.stdout, '');
+  t.is(result.stderr, '');
+  t.is(result.exitCode, 0);
+});
+
 test('linting results are sorted by file/line/names/description', async t => {
   try {
     await execa('../markdownlint.js', ['--config', 'test-config.json', 'incorrect.md'], {stripFinalNewline: false});