make unzip-progress status available as callback

- remove progress console log.

README.md

@@ -73,7 +73,7 @@ If `selectedPage` is larger than the number of pages the last page will be selec
 If set a legend explaining the waterfall colours is rendered in the `legendHolder` DOM element.
 
 ## `*.zhar` - zipped HAR files
-By loading `/perf-cascade-file-reader.min.js` as in [this example](https://github.com/micmro/PerfCascade/blob/master/src/index.html#L78-L84) you can use `perfCascadeFileReader.readFile` to read a zip file and convert it to a JSON HAR object.
+By loading `/perf-cascade-file-reader.min.js` as in [this example](https://github.com/micmro/PerfCascade/blob/master/src/index.html#L78-L86) you can use `perfCascadeFileReader.readFile` to read a zip file and convert it to a JSON HAR object.
 
 ```javascript
 perfCascadeFileReader.readFile(fileFromTheFileInput, fileName, function(error, data){
@@ -87,6 +87,10 @@ perfCascadeFileReader.readFile(fileFromTheFileInput, fileName, function(error, d
 })
 ```
 
+Optionally `perfCascadeFileReader.readFile` also takes a callback (`(progress:number) => void`) as a forth argument
+that gets called whenever a new unzip progress status is available.
+
+
 ## Dev
 - Start live-reload server and Typescript compiler with watch: `npm run watch`
 - Create uglified version: `npm run build` (not tracked ITM)

src/index.html

@@ -81,6 +81,8 @@ <h1>WPT HAR</h1>
                         } else {
                             renderPerfCascadeChart(data)
                         }
+                    }, function(progress) {
+                        console.log("unzip progress: ", progress / 100, "%");
                     })
                 }
 

src/ts/file-reader.ts

@@ -6,7 +6,10 @@ declare const zip: any;
 zip.useWebWorkers = false;
 
 /** handle client side file upload */
-export function readFile(file: File, fileName: string, callback: (e: Error, har?: Har) => void) {
+export function readFile(file: File,
+                         fileName: string,
+                         callback: (e: Error, har?: Har) => void,
+                         onProgress?: (progress: number) => void) {
   if (!file) {
     return callback(new Error("Failed to load HAR file"));
   }
@@ -30,9 +33,7 @@ export function readFile(file: File, fileName: string, callback: (e: Error, har?
           parseJson(txt);
           // close the zip reader
           zipReader.close();
-        }, (progress: number) => {
-          console.log(`unzip progress: ${progress / 100}%`);
-        });
+        }, onProgress);
       });
     });
   } else {