update document contents even if postprocess command returns error

needed for standardjs which changes file on disk and return error if there are unfixed issues

plugins/c9.ide.collab/server/collab-server.js

@@ -1941,6 +1941,9 @@ function syncDocument(docId, doc, client, forceSync, callback) {
     
     function doSyncDocument() {
         Fs.readFile(file, "utf8", function (err, contents) {
+            if (typeof doc.contents != "string" && doc.contents)
+                doc.contents = doc.contents.toString(); // because it can be a buffer
+
             if (err)
                 return callback(err);
 
@@ -2201,7 +2204,7 @@ function handleSaveFile(userIds, client, data) {
                             type: "POST_PROCESSOR_ERROR",
                             data: {
                                 code: err.code,
-                                stderr: result && result.stderr,		
+                                stderr: err.stderr,
                                 docId: docId,
                             }
                         });
@@ -2223,40 +2226,27 @@ function handleSaveFile(userIds, client, data) {
 
 function execPostProcessor(absPath, docId, doc, fileContents, client, postProcessor, callback) {
     localfsAPI.writeToWatchedFile(absPath, function(afterWrite) {
-        localfsAPI.execFile(
+        localfsAPI.execFile(postProcessor.command, {
-            postProcessor.command,
+            args: postProcessor.args.map(function(a) { return a.replace(/\$file/g, absPath); }),
-            { args: postProcessor.args.map(function(a) { return a.replace(/\$file/g, absPath); }) },
+            cwd: Path.dirname(absPath),
+        },
         function(err, result) {
-                if (err) return done(err);
-                
-                afterWrite(function() {
-                    Fs.readFile(absPath, "utf8", done);
-                });
-            }
-        );
-    });
-    
-    function done(err, result) {
-        var newFileContents = result && result.toString().replace(/\n/g, doc.newLineChar || DEFAULT_NL_CHAR_FILE);
-        if (!newFileContents || newFileContents === fileContents) {
             if (err) {
                 client.send({
                     type: "POST_PROCESSOR_ERROR",
                     data: {
                         code: err.code,
-                        stderr: result && result.stderr,
+                        stderr: err.stderr,
                         docId: docId,
                     }
                 });
-                return callback();
-            }
-            return callback();
             }
             
-        doc.contents = fileContents;
+            syncDocument(docId, doc, null, true, function() {
-        
+                afterWrite(callback)
-        syncDocument(docId, doc, null, false, callback);
+            });
-    }
+        });
+    });
 }
 
 /**