feat: create task with advanced options (#157)

ui/flutter/lib/util/file_icon.dart

@@ -1,5 +1,5 @@
 findIcon(String filename) {
-  String res = 'doc';
+  String res = 'file';
   String ext = filename.substring(filename.lastIndexOf('.') + 1);
   for (var iconMap in iconMaps) {
     if (iconMap['extensions'].contains(ext)) {

ui/flutter/lib/util/icons.dart

@@ -28,6 +28,7 @@ class FaIcons {
 
   static const _kFontFam = 'FontAwesome';
   static const Map<String, IconData> allIcons = {
+    'file': file,
     'doc': doc,
     'file_image': file_image,
     'file_video': file_video,

ui/flutter/lib/util/input_formatter.dart

@@ -0,0 +1,30 @@
+import 'package:flutter/services.dart';
+
+/// A [TextInputFormatter] that restricts input to a numerical range between [min] and [max].
+class NumericalRangeFormatter extends TextInputFormatter {
+  final int min;
+  final int max;
+
+  NumericalRangeFormatter({required this.min, required this.max});
+
+  @override
+  TextEditingValue formatEditUpdate(
+    TextEditingValue oldValue,
+    TextEditingValue newValue,
+  ) {
+    if (newValue.text.isEmpty) {
+      return newValue;
+    }
+    var intVal = int.tryParse(newValue.text);
+    if (intVal == null) {
+      return oldValue;
+    }
+    if (intVal < min) {
+      return newValue.copyWith(text: min.toString());
+    } else if (intVal > max) {
+      return oldValue.copyWith(text: max.toString());
+    } else {
+      return newValue;
+    }
+  }
+}

ui/flutter/lib/util/util.dart

@@ -1,4 +1,5 @@
 import 'dart:async';
+import 'dart:convert';
 import 'dart:io';
 
 import 'package:flutter/foundation.dart';
@@ -12,7 +13,9 @@ class Util {
   }
 
   static String fmtByte(int byte) {
-    if (byte < 1024) {
+    if (byte < 0) {
+      return "0 B";
+    } else if (byte < 1024) {
       return "$byte B";
     } else if (byte < 1024 * 1024) {
       return "${(byte / 1024).toStringAsFixed(2)} KB";
@@ -61,6 +64,14 @@ class Util {
     return kIsWeb;
   }
 
+  static List<String> textToLines(String text) {
+    if (text.isEmpty) {
+      return [];
+    }
+    const ls = LineSplitter();
+    return ls.convert(text);
+  }
+
   // if one future complete, return the result, only all future error, return the last error
   static anyOk<T>(Iterable<Future<T>> futures) {
     final completer = Completer<T>();
@@ -74,9 +85,7 @@ class Util {
       }).catchError((e) {
         lastError = e;
         count--;
-        print(count);
         if (count == 0) {
-          print("completeError");
           completer.completeError(lastError);
         }
       });