Add versioning and error handling

mobile-app/lib/github_reader.dart

@@ -41,17 +41,37 @@ class GitHubAdapter {
               "+filename:mordheim.yml+path:\"" +
               path +
               "\"");
+
+      // GitHub is not reachable
+      if (response.statusCode != 200) {
+        syncErrors.add('Could not find any warband roaster files');
+        yield {};
+        return;
+      }
+
+      // No valid response from GitHub
+      dynamic searchResults;
+      try {
+        searchResults = jsonDecode(response.body);
+      } on FormatException catch (e) {
+        syncErrors.add('Could not parse GitHub response.');
+        yield {};
+        return;
+      }
+
+      // Find suitable files for examination
       RegExp fileRegex = new RegExp(r"[a-zA-Z]+\.mordheim\.ya?ml");
-      var resp = jsonDecode(response.body);
-
-      for (var searchResult in resp['items']) {
+      for (dynamic searchResult in searchResults['items']) {
         if (fileRegex.hasMatch(searchResult['name'])) {
+          // We try to get the name of the player from the name of the folder
+          // in which the file resists
           String completePath = searchResult['path'];
-          String playerName =
-              completePath.substring(path.length + 1).split('/').first;
+          List<String> pathParts =
+              completePath.substring(path.length + 1).split('/');
 
-          if (playerName == '') {
-            playerName = 'Lonely Recluse';
+          String playerName;
+          if (pathParts.length >= 2) {
+            playerName = pathParts.first;
           }
 
           // Fetch last change and some metainformation of the file
@@ -60,18 +80,34 @@ class GitHubAdapter {
                   repository +
                   "/commits?path=" +
                   completePath);
-          var resp = jsonDecode(response.body);
-          var lastCommit = resp.first;
 
-          // TODO: Add some error handling
+          if (response.statusCode != 200) {
+            syncErrors.add('Could not load the warband metadata from GitHub.');
+            continue;
+          }
 
+          // No valid response from GitHub
+          dynamic commits;
+          try {
+            commits = jsonDecode(response.body);
+          } on FormatException catch (e) {
+            syncErrors.add('Could not parse GitHub response.');
+            continue;
+          }
+
+          // No commits available
+          if (commits.length == 0) {
+            continue;
+          }
+
+          dynamic latestCommit = commits.first;
           yield {
             'filePath': completePath.toString(),
-            'shaHash': lastCommit['sha'],
+            'shaHash': latestCommit['sha'],
             'player': playerName.toString(),
-            'author': lastCommit['commit']['author']['name'],
-            'date': lastCommit['commit']['committer']['date'],
-            'message': lastCommit['commit']['message']
+            'author': latestCommit['commit']['author']['name'],
+            'date': latestCommit['commit']['committer']['date'],
+            'message': latestCommit['commit']['message']
           };
         }
       }
@@ -89,11 +125,16 @@ class GitHubAdapter {
       try {
         YamlMap yamlObject = loadYaml(response.body);
         WarbandRoaster roaster = WarbandRoaster.fromJson(yamlObject);
+        if (player['player'] != '') {
           roaster.playerName = player['player'];
-        roaster.author = player['author'];
-        roaster.commitDate = player['date'];
-        roaster.commitMessage = player['message'];
-        roaster.commitHash = player['shaHash']
+        }
+
+        roaster.currentVersion = new Version(player['shaHash'], player['date'],
+            player['author'], player['message']);
+
+        // On a search, we drop all previous information about the warbands,
+        // Sp, lastSyncVersion is equal to the currentVersion.
+        roaster.lastSyncVersion = roaster.currentVersion;
 
         roasters.add(roaster);
       } catch (e) {

mobile-app/lib/main.dart

@@ -56,8 +56,8 @@ class _RoasterWidgetState extends State<RoasterWidget> {
 
     roasters.forEach((roaster) {
       tiles.add(ListTile(
-          title: Text(roaster.name + '(' + roaster.playerName + ')'),
-          subtitle: Text(roaster.commitMessage),
+          title: Text(roaster.name + ' (' + roaster.playerName + ')'),
+          subtitle: Text(roaster.currentVersion.message),
           isThreeLine: true,
           trailing: Chip(
               label: Text(
@@ -83,6 +83,10 @@ class _RoasterWidgetState extends State<RoasterWidget> {
             case ConnectionState.done:
               List<WarbandRoaster> roasters = snapshot.data;
 
+              if (roasters.length == 0) {
+                return Text('No warbands found');
+              }
+
               // TODO: Replace with router
               WarbandRoaster warband = roasters.first;
 

mobile-app/lib/warband_roaster.dart

@@ -153,6 +153,16 @@ class Stats {
       this.save);
 }
 
+class Version {
+  String gitHash;
+  String date;
+
+  String author;
+  String message;
+
+  Version(this.gitHash, this.date, this.author, this.message);
+}
+
 @JsonSerializable(nullable: true, anyMap: true, createToJson: false)
 class WarbandRoaster {
   /// Store the complete string of name and race. This will split up into the
@@ -180,11 +190,10 @@ class WarbandRoaster {
 
   /// The players name is not defined in the yml file. This will be added later
   /// from the GitHubAdapter.
-  String playerName = '';
-  String author = '';
-  String commitDate = '';
-  String commitMessage = '';
-  String commitHash = '';
+  String playerName = 'Lonely Recluse';
+
+  Version lastSyncVersion;
+  Version currentVersion;
 
   WarbandRoaster(
       this.nameAndRace,