Adds call to progress bar function

README.md

@@ -138,6 +138,7 @@ The input's file paths and directory structure will be preserved in the [`dag-pb
 - `dirBuilder` (object): the options for the directory builder
   - `hamt` (object): the options for the HAMT sharded directory builder
     - bits (positive integer, defaults to `8`): the number of bits at each bucket of the HAMT
+- `progress` (function): a function that will be called with the byte length of chunks as a file is added to ipfs.
 
 ### Exporter
 

src/builder/builder.js

@@ -93,7 +93,12 @@ module.exports = function (createChunker, ipldResolver, createReducer, _options)
     pull(
       file.content,
       createChunker(options.chunkerOptions),
-      pull.map(chunk => new Buffer(chunk)),
+      pull.map(chunk => {
+        if (options.progress && typeof options.progress === 'function') {
+          options.progress(chunk.byteLength)
+        }
+        return new Buffer(chunk)
+      }),
       pull.map(buffer => new UnixFS('file', buffer)),
       pull.asyncMap((fileNode, callback) => {
         DAGNode.create(fileNode.marshal(), (err, node) => {