Add input from STDIN

Add option for input encoding

package.json

@@ -1,6 +1,6 @@
 {
   "name": "yaml-sort",
-  "version": "1.1.1",
+  "version": "1.2.0",
   "description": "CLI tool to sort YAML files alphabetically",
   "main": "yaml-sort.js",
   "scripts": {

test/test.js

@@ -6,10 +6,21 @@ const test = require('tape')
 const spawn = require('tape-spawn')
 const opts = { cwd: __dirname }
 
-test('CLI w/o arg', (t) => {
-  const proc = spawn(t, '../yaml-sort.js', opts)
-  proc.exitCode(1)
-  proc.stderr.match(/Missing required argument: input/)
+test('CLI help', (t) => {
+  const proc = spawn(t, '../yaml-sort.js -h', opts)
+  proc.exitCode(0)
+  proc.end()
+})
+
+test('CLI w/o arg (STDIN)', (t) => {
+  const proc = spawn(t, 'cat test.yml | ../yaml-sort.js', opts)
+  proc.exitCode(0)
+  proc.stdout.match('a: Lorem ipsum dolor sit amet, consectetur adipiscing elit...\n' +
+      'b:\n' +
+      '  b: 35\n' +
+      '  c:\n' +
+      '    d: false\n' +
+      '\n')
   proc.end()
 })
 
@@ -82,6 +93,20 @@ test('CLI --check SUCCESS', (t) => {
   proc.end()
 })
 
+test('CLI --encoding FAIL', (t) => {
+  const proc = spawn(t,
+    '../yaml-sort.js --input test-utf16le.yml --stdout', opts)
+  proc.exitCode(1)
+  proc.end()
+})
+
+test('CLI --encoding SUCCESS', (t) => {
+  const proc = spawn(t,
+    '../yaml-sort.js --input test-utf16le.yml --stdout --encoding utf16le', opts)
+  proc.exitCode(0)
+  proc.end()
+})
+
 test('CLI --lineWidth SUCCESS', (t) => {
   const proc = spawn(t,
     '../yaml-sort.js --input test.yml --output output.yml' +

yaml-sort.js

@@ -16,10 +16,14 @@ const argv = require('yargs')
     '$0 --input config.yml --indent 4 --output sorted.yml',
     'Indents with 4 spaces and outputs result to file sorted.yml'
   )
+  .example(
+    'cat config.yml | $0',
+    'Sorts alphabetically from STDIN'
+  )
   .option('input', {
     alias: 'i',
     describe: 'The YAML file(s) which needs to be sorted',
-    demandOption: 'Please provide an input file',
+    default: '-',
     string: true,
     array: true
   })
@@ -46,13 +50,18 @@ const argv = require('yargs')
     describe: 'Indentation width to use (in spaces)',
     number: true
   })
+  .option('encoding', {
+    alias: 'e',
+    default: 'utf8',
+    describe: 'Input encoding',
+    choices: ['ascii', 'utf8', 'utf16le']
+  })
   .option('lineWidth', {
     alias: 'w',
     default: 80,
     describe: 'Wrap line width',
     number: true
   })
-  .demandOption(['input'])
   .help('h')
   .alias('h', 'help')
   .version()
@@ -66,7 +75,8 @@ let success = true
 
 argv.input.forEach((file) => {
   try {
-    const content = fs.readFileSync(file, 'utf8')
+    const stdin_input = file === '-'
+    const content = fs.readFileSync(stdin_input ? process.stdin.fd : file, argv.encoding)
 
     const sorted = yaml.dump(yaml.load(content), {
       sortKeys: true,
@@ -79,7 +89,7 @@ argv.input.forEach((file) => {
         success = false
         console.warn(`'${file}' is not sorted and/or formatted (indent, line width).`)
       }
-    } else if (argv.stdout) {
+    } else if (argv.stdout || stdin_input) {
       console.log(sorted)
     } else {
       fs.writeFile(