Add stdin support

package.json

@@ -50,6 +50,8 @@
     "eslint-config-lukechilds": "^1.5.1"
   },
   "dependencies": {
-    "commander": "^2.9.0"
+    "commander": "^2.9.0",
+    "fs-promise": "^0.5.0",
+    "get-stdin": "^5.0.1"
   }
 }

src/cli.js

@@ -1,7 +1,8 @@
 #!/usr/bin/env node
 
 import program from 'commander';
-import { readFileSync } from 'fs';
+import { readFile } from 'fs-promise';
+import getStdin from 'get-stdin';
 import { version } from '../package.json';
 import htconvert from './htconvert';
 
@@ -10,6 +11,6 @@ program
   .option('-f, --file [.htaccess]', 'File containing .htaccess redirects')
   .parse(process.argv);
 
-const htaccessRules = readFileSync(program.file, 'utf-8');
-const nginxRules = htconvert(htaccessRules);
-console.log(nginxRules);
+const readHtaccess = program.file ? readFile(program.file, 'utf-8') : getStdin();
+
+readHtaccess.then(htconvert).then(console.log);