feat: promisify the "run" command

Author: NoamGaash

index.ts

@@ -310,19 +310,24 @@ export class PythonShell extends EventEmitter {
      * @param  {string}   scriptPath   The path to the script to execute
      * @param  {Options}   options  The execution options
      * @param  {Function} callback The callback function to invoke with the script results
-     * @return {PythonShell}       The PythonShell instance
+     * @return {Promise}  the output from the python script
      */
     static run(scriptPath: string, options?: Options, callback?: (err?: PythonShellError, output?: any[]) => any) {
         let pyshell = new PythonShell(scriptPath, options);
         let output = [];
 
-        return pyshell.on('message', function (message) {
-            output.push(message);
-        }).end(function (err) {
-            return callback(err ? err : null, output.length ? output : null);
+        return new Promise((resolve, reject) => {
+            return pyshell.on('message', function (message) {
+                output.push(message);
+            }).end(function (err) {
+                if(err) reject(err);
+                else resolve(output);
+                return callback(err ? err : null, output.length ? output : null);
+            });
         });
     };
 
+
     /**
      * Runs the inputted string of python code and returns collected messages. DO NOT ALLOW UNTRUSTED USER INPUT HERE!
      * @param  {string}   code   The python code to execute

test/test-python-shell.ts

@@ -250,8 +250,8 @@ describe('PythonShell', function () {
             };
         })
 
-        it('should run PythonShell normally without access to std streams', function (done) {
-            var pyshell = PythonShell.run('exit-code.py', {
+        it('should run PythonShell normally without access to std streams', async function (done) {
+            var pyshell = await PythonShell.run('exit-code.py', {
                 // 3 different ways of assigning values to the std streams in child_process.spawn()
                 // * ignore - pipe to /dev/null
                 // * inherit - inherit fd from parent process;
@@ -263,10 +263,7 @@ describe('PythonShell', function () {
                 args: "0"
             }, done);
 
-            should(pyshell.stdin).be.eql(null);
-            should(pyshell.stdout).be.eql(null);
-            should(pyshell.stderr).be.eql(null);
-            should.throws(() => { pyshell.send("asd") });
+            should(pyshell).be.eql([]);
         });
     });