Implement newsgroup list loading in sidebar

lib/main.dart

@@ -1,4 +1,5 @@
 import 'package:flutter/material.dart';
+import 'package:wind/newsgroup_list_view.dart';
 import 'package:wind/nntp_client.dart';
 
 void main() {
@@ -12,15 +13,6 @@ class MyApp extends StatelessWidget {
     return MaterialApp(
       title: 'Wind',
       theme: ThemeData(
-        // This is the theme of your application.
-        //
-        // Try running your application with "flutter run". You'll see the
-        // application has a blue toolbar. Then, without quitting the app, try
-        // changing the primarySwatch below to Colors.green and then invoke
-        // "hot reload" (press "r" in the console where you ran "flutter run",
-        // or simply save your changes to "hot reload" in a Flutter IDE).
-        // Notice that the counter didn't reset back to zero; the application
-        // is not restarted.
         primarySwatch: Colors.indigo,
       ),
       home: MyHomePage(title: 'Wind'),
@@ -31,15 +23,6 @@ class MyApp extends StatelessWidget {
 class MyHomePage extends StatefulWidget {
   MyHomePage({Key? key, required this.title}) : super(key: key);
 
-  // This widget is the home page of your application. It is stateful, meaning
-  // that it has a State object (defined below) that contains fields that affect
-  // how it looks.
-
-  // This class is the configuration for the state. It holds the values (in this
-  // case the title) provided by the parent (in this case the App widget) and
-  // used by the build method of the State. Fields in a Widget subclass are
-  // always marked "final".
-
   final String title;
 
   @override
@@ -47,11 +30,13 @@ class MyHomePage extends StatefulWidget {
 }
 
 class _MyHomePageState extends State<MyHomePage> {
+  late NNTPClient nntpClient;
+
   @override
   void initState() {
     super.initState();
 
-    var client = NNTPClient("localhost:1120");
+    nntpClient = NNTPClient("localhost:1120");
   }
 
   @override
@@ -85,16 +70,9 @@ class _MyHomePageState extends State<MyHomePage> {
                                 fontWeight: FontWeight.bold, fontSize: 20),
                           )),
                       Expanded(
-                        child: ListView(children: [
-                          ListTile(
-                            title: Text(
-                              "test.group",
-                            ),
-                            subtitle: Text("Description of the group"),
-                            onTap: () => {},
-                          )
-                        ]),
-                      )
+                          child: Builder(
+                              builder: (context) =>
+                                  NewsgroupListView(nntpClient))),
                     ],
                   ),
                 ),
@@ -112,18 +90,22 @@ class _MyHomePageState extends State<MyHomePage> {
 
 class ThreadsListView extends StatefulWidget {
   @override
-  State<StatefulWidget> createState() => _ThreadsListViewState();
+  State<StatefulWidget> createState() => ThreadsListViewState();
 }
 
-class _ThreadsListViewState extends State<ThreadsListView> {
+class ThreadsListViewState extends State<ThreadsListView> {
+  String currentGroup = "no group selected";
+
   @override
-  Widget build(Object context) {
-    return Container(
-        width: 640,
-        child: ListView(
-          children: [
-            SizedBox(height: 10),
-            Card(
+  Widget build(BuildContext context) {
+    return Container(width: 640, child: Center(child: Text(currentGroup)));
+  }
+}
+
+class ThreadListItemView extends StatelessWidget {
+  @override
+  Widget build(BuildContext context) {
+    return Card(
         elevation: 5,
         child: InkWell(
           splashColor: Colors.indigo.withAlpha(30),
@@ -135,8 +117,7 @@ class _ThreadsListViewState extends State<ThreadsListView> {
               Container(
                 child: Text(
                   "A question for those who watched The Matrix in 1999.",
-                          style: TextStyle(
-                              fontWeight: FontWeight.bold, fontSize: 21),
+                  style: TextStyle(fontWeight: FontWeight.bold, fontSize: 21),
                 ),
                 margin: EdgeInsets.only(top: 16, left: 16, right: 16),
               ),
@@ -157,8 +138,7 @@ class _ThreadsListViewState extends State<ThreadsListView> {
                     ),
                   ],
                 ),
-                        margin: EdgeInsets.only(
-                            top: 5, bottom: 2, left: 16, right: 16),
+                margin: EdgeInsets.only(top: 5, bottom: 2, left: 16, right: 16),
               ),
               Container(
                 child: Text(
@@ -168,8 +148,6 @@ class _ThreadsListViewState extends State<ThreadsListView> {
               )
             ],
           ),
-                )),
-          ],
         ));
   }
 }

lib/newsgroup_list_view.dart

@@ -0,0 +1,41 @@
+import 'package:flutter/material.dart';
+import 'package:wind/nntp_client.dart';
+
+class NewsgroupListView extends StatelessWidget {
+  final NNTPClient client;
+
+  NewsgroupListView(this.client);
+
+  @override
+  Widget build(BuildContext context) {
+    return FutureBuilder<List<GroupInfo>>(
+      future: _fetchList(),
+      builder: (context, snapshot) {
+        if (snapshot.hasData) {
+          List<GroupInfo> data = snapshot.data!;
+          return _newgroupListView(data);
+        } else if (snapshot.hasError) {
+          return Text("${snapshot.error}");
+        }
+        return Center(child: CircularProgressIndicator());
+      },
+    );
+  }
+
+  Future<List<GroupInfo>> _fetchList() async {
+    return await client.getNewsGroupList();
+  }
+
+  ListView _newgroupListView(List<GroupInfo> data) {
+    return ListView.builder(
+      itemCount: data.length,
+      itemBuilder: (context, index) {
+        return ListTile(
+            style: ListTileStyle.drawer,
+            title: Text(data[index].name),
+            subtitle: Text(data[index].description),
+            onTap: () => {});
+      },
+    );
+  }
+}

lib/nntp_client.dart

@@ -17,7 +17,7 @@ class NNTPClient {
         return;
       }
       var command = commandQueue.removeFirst();
-      var resp = data as String;
+      var resp = data.toString();
       var respLines = resp.split("\r\n");
       respLines.removeWhere((element) => element == "");
       var respCode = int.parse(respLines[0].split(" ")[0]);
@@ -38,6 +38,44 @@ class NNTPClient {
     var result = await cmd.response;
     return result;
   }
+
+  Future<List<GroupInfo>> getNewsGroupList() async {
+    List<GroupInfo> l = [];
+
+    var groupMap = {};
+
+    await _sendCommand("LIST", ["NEWSGROUPS"]).then((value) {
+      value.lines.removeAt(0);
+      value.lines.removeLast();
+      value.lines.forEach((element) {
+        var firstSpace = element.indexOf(" ");
+        var name = element.substring(0, firstSpace);
+        groupMap.addAll({
+          name: {"desc": element.substring(firstSpace + 1)}
+        });
+      });
+    });
+
+    await _sendCommand("LIST", ["ACTIVE"]).then((value) {
+      value.lines.removeAt(0);
+      value.lines.removeLast();
+      value.lines.forEach((element) {
+        var splitted = element.split(" ");
+        var name = splitted[0];
+        var high = splitted[1];
+        var low = splitted[2];
+        groupMap[name]["high"] = high;
+        groupMap[name]["low"] = low;
+      });
+    });
+
+    groupMap.forEach((key, value) {
+      l.add(GroupInfo(key, value["desc"], int.parse(value["low"]),
+          int.parse(value["high"])));
+    });
+
+    return l;
+  }
 }
 
 class _NNTPCommand {
@@ -65,3 +103,12 @@ class _CommandResponse {
 
   _CommandResponse(this.responseCode, this.lines);
 }
+
+class GroupInfo {
+  final String name;
+  final String description;
+  final int lowWater;
+  final int highWater;
+
+  GroupInfo(this.name, this.description, this.lowWater, this.highWater);
+}