Added unlink suport

Author: johanneslumpe

FS.ios.js

@@ -8,9 +8,14 @@ var _readDir = Promise.promisify(RNFSManager.readDir);
 var _stat = Promise.promisify(RNFSManager.stat);
 var _readFile = Promise.promisify(RNFSManager.readFile);
 var _writeFile = Promise.promisify(RNFSManager.writeFile);
+var _unlink = Promise.promisify(RNFSManager.unlink);
 
 var convertError = (err) => {
-  var error = new Error(err.description);
+  if (err.isOperational) {
+    err = err.cause;
+  }
+
+  var error = new Error(err.description || err.message);
   error.code = err.code;
   throw error;
 };
@@ -57,6 +62,11 @@ var RNFS = {
       .catch(convertError);
   },
 
+  unlink(filepath) {
+    return _unlink(filepath)
+      .catch(convertError);
+  },
+
   MainBundle: RNFSManager.MainBundleDirectory,
   CachesDirectory: RNFSManager.NSCachesDirectory,
   DocumentDirectory: RNFSManager.NSDocumentDirectory,

RNFSManager.m

@@ -69,7 +69,6 @@ @implementation RNFSManager
 }
 
 RCT_EXPORT_METHOD(writeFile:(NSString*)filepath contents:(NSString*)base64Content attributes:(NSDictionary*)attributes callback:(RCTResponseSenderBlock)callback){
-
   NSData *data = [[NSData alloc] initWithBase64EncodedString:base64Content options:NSDataBase64DecodingIgnoreUnknownCharacters];
   BOOL success = [[NSFileManager defaultManager] createFileAtPath:filepath contents:data attributes:attributes];
 
@@ -80,10 +79,28 @@ @implementation RNFSManager
   callback(@[[NSNull null], [NSNumber numberWithBool:success]]);
 }
 
+RCT_EXPORT_METHOD(unlink:(NSString*)filepath callback:(RCTResponseSenderBlock)callback) {
+  NSFileManager *manager = [NSFileManager defaultManager];
+  BOOL exists = [manager fileExistsAtPath:filepath isDirectory:false];
+
+  if (!exists) {
+    return callback(@[[NSString stringWithFormat:@"File at path %@ does not exist", filepath]]);
+  }
+  NSError *error;
+  BOOL success = [manager removeItemAtPath:filepath error:&error];
+
+  if (!success) {
+    NSLog(@"%@", error);
+    return callback([self makeErrorPayload:error]);
+  }
+
+  callback(@[[NSNull null], [NSNumber numberWithBool:success], filepath]);
+}
+
 RCT_EXPORT_METHOD(readFile:(NSString*)filepath callback:(RCTResponseSenderBlock)callback){
   NSData *content = [[NSFileManager defaultManager] contentsAtPath:filepath];
   NSString *base64Content = [content base64EncodedStringWithOptions:NSDataBase64EncodingEndLineWithLineFeed];
-  NSLog(@"%@", base64Content);
+
   if (!base64Content) {
     return callback(@[[NSString stringWithFormat:@"Could not read file at path %@", filepath]]);
   }