refacto: use promises (breaking)

* use Promises rather than function/callback
* drop pify as a dependency
* v4.0.0

Author: t1st3

index.js

@@ -1,20 +1,21 @@
 'use strict';
 
 const {exec} = require('child_process');
-const pify = require('pify');
 
-const f = function (cb) {
+module.exports = new Promise((resolve, reject) => {
 	exec('ps -e | grep -E \'unity-panel\'', (error, stdout) => {
 		if (error) {
-			cb(null, false);
+			if (error.killed === false && error.signal === null) {
+				resolve(false);
+			}
+
+			reject(error);
 		}
 
 		if ((stdout).length > 0) {
-			cb(null, true);
+			resolve(true);
 		}
 
-		cb(null, false);
+		resolve(false);
 	});
-};
-
-module.exports = pify(f);
+});

package.json

@@ -1,6 +1,6 @@
 {
   "name": "is-unity",
-  "version": "3.0.0",
+  "version": "4.0.0",
   "description": "Check if the current session runs Unity desktop",
   "license": "MIT",
   "repository": "t1st3/is-unity",
@@ -26,9 +26,7 @@
     "detect",
     "check"
   ],
-  "dependencies": {
-    "pify": "^4.0.0"
-  },
+  "dependencies": {},
   "devDependencies": {
     "ava": "^2.3.0",
     "nyc": "^14.1.1",

readme.md

@@ -15,7 +15,7 @@ $ npm install --save is-unity
 ```js
 const isUnity = require('is-unity');
 
-isUnity().then(data => {
+isUnity.then(data => {
   console.log(data);
   //=> true or false
 });

test.js

@@ -2,5 +2,5 @@ import test from 'ava';
 import isUnity from '.';
 
 test('is-unity', async t => {
-	t.is(await isUnity(), false);
+	t.is(await isUnity, false);
 });