Adding seek-property to write-method

README.md

@@ -364,13 +364,14 @@ write()
 *Writes content to a file.*
 
 `write()` takes a `string` (path or filesystem URL) or `FileEntry` as it's first argument.
-This is the file to write data to. If the does not exist, it is created. Otherwise,
-the file's contents are overwritten if it already exists.
+This is the file to write data to. If the does not exist, it is created. The file's contents are overwritten
+if it already exists, unless the seek-property is defined in the second argument.
 
-The second argument is an object with three properties:
+The second argument is an object with four properties:
 - `data`: the content to write into the file.
 - `type`: optional mimetype of the content.
 - `append`: optional true if data should be appended to the file.
+- `seek`: optional integer indicating the position to start writing.
 
 The success callback for this method is passed the `FileEntry` for the file that
 was written to and the `FileWriter` object used to do the writing.

component.json

@@ -1,5 +1,5 @@
 {
   "name": "filer.js",
-  "version": "0.4.5",
+  "version": "0.4.6",
   "main": "./dist/filer.min.js"
 }

package.json

@@ -1,6 +1,6 @@
 {
   "name": "filer.js",
-  "version": "0.4.5",
+  "version": "0.4.6",
   "description": "A wrapper library for the HTML5 Filesystem API what reuses UNIX commands (cp, mv, ls) for its API.",
   "main": "src/filer.js",
   "directories": {

src/filer.js

@@ -766,12 +766,15 @@ var Filer = new function() {
 
         fileWriter.onerror = opt_errorHandler;
 
-        if (dataObj.append) {
+        if (dataObj.append || dataObj.seek) {
           fileWriter.onwriteend = function(e) {
             if (opt_successCallback) opt_successCallback(fileEntry, this);
           };
 
-          fileWriter.seek(fileWriter.length); // Start write position at EOF.
+          // Start write position at EOF or supplied seek-position
+          var seekPosition = (dataObj.append && fileWriter.length) || dataObj.seek;
+
+          fileWriter.seek(seekPosition);
         } else {
           var truncated = false;
           fileWriter.onwriteend = function(e) {