Finish first version of WebUI

Close #10

src/webdavupload/Upload.go

@@ -93,3 +93,40 @@ func UploadMediaFiles(c *gowebdav.Client, w io.Writer, files []string) {
     uploadFiles(c, w, files, "IMPORT_IMG", "Uploading media files")
 
 }
+
+// Removes a list of files.
+func BatchUnlink(w io.Writer, files []string) {
+
+    _, wImplementsHttpFlusher := interface{}(w).(http.Flusher)
+
+    maxConcTasks := min(10, runtime.NumCPU())
+
+    // Set a semaphore to restrict the number of concurrent upload tasks.
+    semaphore := make(chan struct{}, maxConcTasks)
+    wg := &sync.WaitGroup{}
+
+    for _, f := range(files) {
+
+        semaphore <- struct{}{} // acquire
+        wg.Add(1)
+
+        go func() {
+
+            defer wg.Done()
+            err := os.Remove(f)
+            if err != nil {
+                panic("Failed to delete file " + f)
+            }
+            fmt.Fprintf(w, "Delete file %s\n", f)
+            <-semaphore // release
+
+        }()
+
+    }
+
+    wg.Wait()
+    if wImplementsHttpFlusher == true {
+        w.(http.Flusher).Flush()
+    }
+
+}