Add new file and path utilities

lib/utils/file_utils.dart

@@ -0,0 +1,48 @@
+import 'dart:io';
+import 'dart:typed_data';
+import 'package:path/path.dart' as p;
+import 'package:mime_dart/mime_dart.dart';
+import 'package:uuid/uuid.dart';
+import 'package:path_provider/path_provider.dart';
+
+const uuid = Uuid();
+
+String? getFileExtension(String? mimeType) {
+  if (mimeType == null) {
+    return null;
+  }
+  return Mime.getExtensionsFromType(mimeType)?[0];
+}
+
+Future<String?> getFileDownloadpath(String? name, String? ext) async {
+  final Directory? downloadsDir = await getDownloadsDirectory();
+  if (downloadsDir != null) {
+    name = name ?? getTempFileName();
+    ext = (ext != null) ? ".$ext" : "";
+    String path = '${downloadsDir.path}/$name$ext';
+    int num = 1;
+    while (await File(path).exists()) {
+      path = '${downloadsDir.path}/$name (${num++})$ext';
+    }
+    return path;
+  }
+  return null;
+}
+
+Future<void> saveFile(String path, Uint8List content) async {
+  final file = File(path);
+  await file.writeAsBytes(content);
+}
+
+String getShortPath(String path) {
+  var f = p.split(path);
+  if (f.length > 2) {
+    f = f.sublist(f.length - 2);
+    return ".../${p.joinAll(f)}";
+  }
+  return path;
+}
+
+String getTempFileName() {
+  return uuid.v1();
+}

lib/utils/utils.dart

@@ -1,3 +1,4 @@
 export 'ui_utils.dart';
 export 'convert_utils.dart';
 export 'http_utils.dart';
+export 'file_utils.dart';