upgrade & opt

- flutter 3.0.1
- show snackbar when no server to ping
- server detail page replace nice to iowait
- make script show stdout when error

lib/data/model/server/cpu_2_status.dart

@@ -45,5 +45,12 @@ class Cpu2Status {
     return used.isNaN ? 0 : used * 100;
   }
 
+  double get iowait {
+    if (now.length != pre.length) return 0;
+    final delta = now[0].iowait - pre[0].iowait;
+    final used = delta / totalDelta;
+    return used.isNaN ? 0 : used * 100;
+  }
+
   double get idle => 100 - usedPercent();
 }

lib/data/res/build_data.dart

@@ -2,9 +2,9 @@
 
 class BuildData {
   static const String name = "ServerBox";
-  static const int build = 137;
+  static const int build = 138;
   static const String engine =
-      "Flutter 3.0.0 • channel stable • https://github.com/flutter/flutter.git\nFramework • revision ee4e09cce0 (11 days ago) • 2022-05-09 16:45:18 -0700\nEngine • revision d1b9a6938a\nTools • Dart 2.17.0 • DevTools 2.12.2\n";
-  static const String buildAt = "2022-05-20 19:48:33.039675";
-  static const int modifications = 7;
+      "Flutter 3.0.1 • channel stable • https://github.com/flutter/flutter.git\nFramework • revision fb57da5f94 (2 days ago) • 2022-05-19 15:50:29 -0700\nEngine • revision caaafc5604\nTools • Dart 2.17.1 • DevTools 2.12.2\n";
+  static const String buildAt = "2022-05-21 20:15:15.896932";
+  static const int modifications = 6;
 }

lib/generated/intl/messages_en.dart

@@ -148,6 +148,8 @@ class MessageLookup extends MessageLookupByLibrary {
         "pingAvg": MessageLookupByLibrary.simpleMessage("Avg:"),
         "pingInputIP": MessageLookupByLibrary.simpleMessage(
             "Please input a target IP/domain."),
+        "pingNoServer": MessageLookupByLibrary.simpleMessage(
+            "No server to ping.\nPlease add a server in server tab."),
         "platformNotSupportUpdate": MessageLookupByLibrary.simpleMessage(
             "Current platform does not support in app update.\nPlease build from source and install it."),
         "plzEnterHost":

lib/generated/intl/messages_zh.dart

@@ -130,6 +130,8 @@ class MessageLookup extends MessageLookupByLibrary {
         "ping": MessageLookupByLibrary.simpleMessage("Ping"),
         "pingAvg": MessageLookupByLibrary.simpleMessage("平均:"),
         "pingInputIP": MessageLookupByLibrary.simpleMessage("请输入目标IP或域名"),
+        "pingNoServer": MessageLookupByLibrary.simpleMessage(
+            "没有服务器可用于Ping\n请在服务器tab添加服务器后再试"),
         "platformNotSupportUpdate":
             MessageLookupByLibrary.simpleMessage("当前平台不支持更新，请编译最新源码后手动安装"),
         "plzEnterHost": MessageLookupByLibrary.simpleMessage("请输入主机"),

lib/generated/l10n.dart

@@ -1220,6 +1220,16 @@ class S {
       args: [],
     );
   }
+
+  /// `No server to ping.\nPlease add a server in server tab.`
+  String get pingNoServer {
+    return Intl.message(
+      'No server to ping.\nPlease add a server in server tab.',
+      name: 'pingNoServer',
+      desc: '',
+      args: [],
+    );
+  }
 }
 
 class AppLocalizationDelegate extends LocalizationsDelegate<S> {

lib/l10n/intl_en.arb

@@ -115,5 +115,6 @@
     "platformNotSupportUpdate": "Current platform does not support in app update.\nPlease build from source and install it.",
     "invalidVersionHelp": "Please make sure that docker is installed correctly, or that you are using a non-self-compiled version. If you don't have the above issues, please submit an issue on {url}.",
     "noInterface": "No interface",
-    "lastTry": "Last try!"
+    "lastTry": "Last try!",
+    "pingNoServer": "No server to ping.\nPlease add a server in server tab."
 }

lib/l10n/intl_zh.arb

@@ -115,5 +115,6 @@
     "platformNotSupportUpdate": "当前平台不支持更新，请编译最新源码后手动安装",
     "invalidVersionHelp": "请确保正确安装了docker，或者使用的非自编译版本。如果没有以上问题，请在 {url} 提交问题。",
     "noInterface": "没有可用的接口",
-    "lastTry": "最后尝试"
+    "lastTry": "最后尝试",
+    "pingNoServer": "没有服务器可用于Ping\n请在服务器tab添加服务器后再试"
 }

lib/view/page/ping.dart

@@ -21,6 +21,7 @@ class _PingPageState extends State<PingPage>
   late TextEditingController _textEditingController;
   late MediaQueryData _media;
   final List<PingResult> _results = [];
+  final _serverProvider = locator<ServerProvider>();
   late S s;
   static const summaryTextStyle = TextStyle(
     fontSize: 12,
@@ -106,7 +107,12 @@ class _PingPageState extends State<PingPage>
       return;
     }
 
-    await Future.wait(locator<ServerProvider>().servers.map((e) async {
+    if (_serverProvider.servers.isEmpty) {
+      showSnackBar(context, Text(s.pingNoServer));
+      return;
+    }
+
+    await Future.wait(_serverProvider.servers.map((e) async {
       if (e.client == null) {
         return;
       }

lib/view/page/server/detail.dart

@@ -100,7 +100,7 @@ class _ServerDetailPageState extends State<ServerDetailPage>
                     SizedBox(
                       width: _media.size.width * 0.03,
                     ),
-                    _buildCPUTimePercent(ss.cpu2Status.nice, 'nice'),
+                    _buildCPUTimePercent(ss.cpu2Status.iowait, 'io'),
                     SizedBox(
                       width: _media.size.width * 0.03,
                     ),