Fix streaming: add --stdin flag

Closes GH-189.

cli.js

@@ -51,19 +51,21 @@ var cli = meow(
     '  -q, --quiet  output only warnings and errors',
     '  -t, --text   treat input as plain-text (not markdown)',
     '  -d, --diff   ignore unchanged lines (affects Travis only)',
+    '  --stdin      read from stdin',
     '',
     'When no input files are given, searches for markdown and text',
     'files in the current directory, `doc`, and `docs`.',
     '',
     'Examples',
-    '  $ echo "His network looks good" | alex',
+    '  $ echo "His network looks good" | alex --stdin',
     '  $ alex *.md !example.md',
     '  $ alex'
   ].join('\n'),
   {
     flags: {
       version: {type: 'boolean', alias: 'v'},
       help: {type: 'boolean', alias: 'h'},
+      stdin: {type: 'boolean'},
       text: {type: 'boolean', alias: 't'},
       diff: {type: 'boolean', alias: 'd'},
       quiet: {type: 'boolean', alias: 'q'},
@@ -73,10 +75,16 @@ var cli = meow(
 )
 
 /* Set-up. */
-var globs = ['{docs/**/,doc/**/,}*.{' + extensions.join(',') + '}']
+var defaultGlobs = ['{docs/**/,doc/**/,}*.{' + extensions.join(',') + '}']
+var globs
 
-/* istanbul ignore else - Bug in tests. Something hangs, at least. */
-if (cli.input.length !== 0) {
+if (cli.flags.stdin) {
+  if (cli.input.length !== 0) {
+    throw new Error('Do not pass globs with `--stdin`')
+  }
+} else if (cli.input.length === 0) {
+  globs = defaultGlobs
+} else {
   globs = cli.input
 }
 

test/cli.js

@@ -25,6 +25,33 @@ test('help', function(t) {
   })
 })
 
+test('stdin', function(t) {
+  return execa
+    .stderr('./cli.js', ['--stdin'], {input: 'His'})
+    .catch(function(err) {
+      t.is(
+        err.stderr,
+        [
+          '<stdin>',
+          '  1:1-1:4  warning  `His` may be insensitive, use `Their`, `Theirs`, `Them` instead  her-him  retext-equality',
+          '',
+          '⚠ 1 warning',
+          ''
+        ].join('\n')
+      )
+    })
+})
+
+test('stdin and globs', function(t) {
+  var rp = path.join('test', 'fixtures', 'one.md')
+
+  return execa
+    .stderr('./cli.js', ['--stdin', rp], {input: 'His'})
+    .catch(function(err) {
+      t.regex(err.stderr, /Do not pass globs with `--stdin`/)
+    })
+})
+
 test('markdown by default', function(t) {
   var rp = path.join('test', 'fixtures', 'one.md')
 
@@ -107,3 +134,23 @@ test('non-binary (optional)', function(t) {
     t.is(err.stderr, expected)
   })
 })
+
+test('default globs', function(t) {
+  return execa.stderr('./cli.js').catch(function(err) {
+    var expected = [
+      'code-of-conduct.md',
+      '  1:1  error  Cannot process specified file: it’s ignored',
+      '',
+      'contributing.md: no issues found',
+      'example.md',
+      '  1:1  error  Cannot process specified file: it’s ignored',
+      '',
+      'readme.md: no issues found',
+      '',
+      '✖ 2 errors',
+      ''
+    ].join('\n')
+
+    t.is(err.stderr, expected)
+  })
+})