Improve diagnostics

Flow.Launcher.Localization.SourceGenerators/Localize/LocalizeSourceGenerator.cs

@@ -465,8 +465,9 @@ private static PluginClassInfo GetValidPluginInfo(
             ImmutableArray<PluginClassInfo> pluginClasses,
             SourceProductionContext context)
         {
-            var nonNullExistClasses = pluginClasses.Where(p => p != null && p.PropertyName != null).ToArray();
-            if (nonNullExistClasses.Length == 0)
+            // If p is null, this class does not implement IPluginI18n
+            var iPluginI18nClasses = pluginClasses.Where(p => p != null).ToArray();
+            if (iPluginI18nClasses.Length == 0)
             {
                 context.ReportDiagnostic(Diagnostic.Create(
                     SourceGeneratorDiagnostics.CouldNotFindPluginEntryClass,
@@ -475,7 +476,24 @@ private static PluginClassInfo GetValidPluginInfo(
                 return null;
             }
 
-            foreach (var pluginClass in nonNullExistClasses)
+            // If p.PropertyName is null, this class does not have PluginInitContext property
+            var iPluginI18nClassesWithContext = iPluginI18nClasses.Where(p => p.PropertyName != null).ToArray();
+            if (iPluginI18nClassesWithContext.Length == 0)
+            {
+                foreach (var pluginClass in iPluginI18nClasses)
+                {
+                    context.ReportDiagnostic(Diagnostic.Create(
+                        SourceGeneratorDiagnostics.CouldNotFindContextProperty,
+                        pluginClass.Location,
+                        pluginClass.ClassName
+                    ));
+                }
+                return null;
+            }
+
+            // Rest classes have implemented IPluginI18n and have PluginInitContext property
+            // Check if the property is valid
+            foreach (var pluginClass in iPluginI18nClassesWithContext)
             {
                 if (pluginClass.IsValid == true)
                 {

Flow.Launcher.Localization.SourceGenerators/SourceGeneratorDiagnostics.cs

@@ -8,7 +8,7 @@ public static class SourceGeneratorDiagnostics
         public static readonly DiagnosticDescriptor CouldNotFindResourceDictionaries = new DiagnosticDescriptor(
             "FLSG0001",
             "Could not find resource dictionaries",
-            "Could not find resource dictionaries. There must be a file named [LANG].xaml file (for example, en.xaml), and it must be specified in <AdditionalFiles /> in your .csproj file.",
+            "Could not find resource dictionaries. There must be a `en.xaml` file under `Language` folder.",
             "Localization",
             DiagnosticSeverity.Warning,
             isEnabledByDefault: true
@@ -17,7 +17,7 @@ public static class SourceGeneratorDiagnostics
         public static readonly DiagnosticDescriptor CouldNotFindPluginEntryClass = new DiagnosticDescriptor(
             "FLSG0002",
             "Could not find the main class of plugin",
-            $"Could not find the main class of your plugin. It must implement {Constants.PluginInterfaceName}.",
+            $"Could not find the main class of your plugin. It must implement `{Constants.PluginInterfaceName}`.",
             "Localization",
             DiagnosticSeverity.Warning,
             isEnabledByDefault: true
@@ -26,7 +26,7 @@ public static class SourceGeneratorDiagnostics
         public static readonly DiagnosticDescriptor CouldNotFindContextProperty = new DiagnosticDescriptor(
             "FLSG0003",
             "Could not find plugin context property",
-            $"Could not find a property of type {Constants.PluginContextTypeName} in {{0}}. It must be a public static or internal static property of the main class of your plugin.",
+            $"Could not find a property of type `{Constants.PluginContextTypeName}` in `{{0}}`. It must be a public static or internal static property of the main class of your plugin.",
             "Localization",
             DiagnosticSeverity.Warning,
             isEnabledByDefault: true
@@ -35,7 +35,7 @@ public static class SourceGeneratorDiagnostics
         public static readonly DiagnosticDescriptor ContextPropertyNotStatic = new DiagnosticDescriptor(
             "FLSG0004",
             "Plugin context property is not static",
-            "Context property {0} is not static. It must be static.",
+            "Context property `{0}` is not static. It must be static.",
             "Localization",
             DiagnosticSeverity.Warning,
             isEnabledByDefault: true
@@ -44,7 +44,7 @@ public static class SourceGeneratorDiagnostics
         public static readonly DiagnosticDescriptor ContextPropertyIsPrivate = new DiagnosticDescriptor(
             "FLSG0005",
             "Plugin context property is private",
-            "Context property {0} is private. It must be either internal or public.",
+            "Context property `{0}` is private. It must be either internal or public.",
             "Localization",
             DiagnosticSeverity.Warning,
             isEnabledByDefault: true
@@ -53,7 +53,7 @@ public static class SourceGeneratorDiagnostics
         public static readonly DiagnosticDescriptor ContextPropertyIsProtected = new DiagnosticDescriptor(
             "FLSG0006",
             "Plugin context property is protected",
-            "Context property {0} is protected. It must be either internal or public.",
+            "Context property `{0}` is protected. It must be either internal or public.",
             "Localization",
             DiagnosticSeverity.Warning,
             isEnabledByDefault: true
@@ -62,7 +62,7 @@ public static class SourceGeneratorDiagnostics
         public static readonly DiagnosticDescriptor LocalizationKeyUnused = new DiagnosticDescriptor(
             "FLSG0007",
             "Localization key is unused",
-            $"Method '{Constants.ClassName}.{{0}}' is never used",
+            $"Method `{Constants.ClassName}.{{0}}` is never used",
             "Localization",
             DiagnosticSeverity.Warning,
             isEnabledByDefault: true