#109 fix: path sep on win

lib/core/update.dart

@@ -6,7 +6,6 @@ import 'package:flutter_gen/gen_l10n/l10n.dart';
 import 'package:logging/logging.dart';
 import 'package:r_upgrade/r_upgrade.dart';
 import 'package:toolbox/core/extension/navigator.dart';
-import 'package:toolbox/core/utils/misc.dart';
 import 'package:toolbox/data/res/path.dart';
 
 import '../data/provider/app.dart';

lib/core/utils/misc.dart

@@ -73,16 +73,7 @@ String getTime(int? unixMill) {
       .replaceFirst('.000', '');
 }
 
+/// Join two path with `/`
 String pathJoin(String path1, String path2) {
   return path1 + (path1.endsWith('/') ? '' : '/') + path2;
 }
-
-String? getHomeDir() {
-  final envVars = Platform.environment;
-  if (isMacOS || isLinux) {
-    return envVars['HOME'];
-  } else if (isWindows) {
-    return envVars['UserProfile'];
-  }
-  return null;
-}

lib/core/utils/platform.dart

@@ -10,7 +10,7 @@ enum PlatformType {
   windows,
   web,
   fuchsia,
-  unknown,
+  unknown;
 }
 
 final _p = () {
@@ -38,7 +38,15 @@ final _p = () {
   return PlatformType.unknown;
 }();
 
+final _pathSep = () {
+  if (Platform.isWindows) {
+    return '\\';
+  }
+  return '/';
+}();
+
 PlatformType get platform => _p;
+String get pathSeparator => _pathSep;
 
 bool get isAndroid => _p == PlatformType.android;
 bool get isIOS => _p == PlatformType.ios;
@@ -51,3 +59,23 @@ bool get isDesktop =>
     _p == PlatformType.linux ||
     _p == PlatformType.macos ||
     _p == PlatformType.windows;
+
+/// Available only on desktop,
+/// return null on mobile
+String? getHomeDir() {
+  final envVars = Platform.environment;
+  if (isMacOS || isLinux) {
+    return envVars['HOME'];
+  } else if (isWindows) {
+    return envVars['UserProfile'];
+  }
+  return null;
+}
+
+/// Join two paths with platform specific separator
+String pathJoin(String path1, String path2) {
+  if (isWindows) {
+    return path1 + (path1.endsWith('\\') ? '' : '\\') + path2;
+  }
+  return path1 + (path1.endsWith('/') ? '' : '/') + path2;
+}