feat: add nullable option

close #5

Author: mob-sakai

Editor/CSharpProjectModifier.cs

@@ -28,6 +28,10 @@ private static string OnGeneratedCSProject(string path, string content)
             if (!setting.UseDefaultCompiler)
                 content = Regex.Replace(content, "<LangVersion>.*</LangVersion>", "<LangVersion>" + setting.LanguageVersion + "</LangVersion>", RegexOptions.Multiline);
 
+            // Enable nullable.
+            if (setting.EnableNullable)
+                content = Regex.Replace(content, "(\\s+)(<LangVersion>.*</LangVersion>)([\r\n]+)", "$1$2$3$1<Nullable>enable</Nullable>$3");
+
             return content;
         }
     }

Editor/CscSettingsProvider.cs

@@ -36,6 +36,7 @@ private static void OnGUI(string searchContext)
                 EditorGUILayout.PropertyField(serializedObject.FindProperty("m_PackageName"));
                 EditorGUILayout.PropertyField(serializedObject.FindProperty("m_PackageVersion"));
                 EditorGUILayout.PropertyField(serializedObject.FindProperty("m_LanguageVersion"));
+                EditorGUILayout.PropertyField(serializedObject.FindProperty("m_EnableNullable"));
                 EditorGUI.indentLevel--;
             }
 

Editor/InspectorGUI.cs

@@ -143,6 +143,7 @@ private static void OnPostHeaderGUI(Editor editor)
                     EditorGUILayout.PropertyField(_serializedObject.FindProperty("m_PackageName"));
                     EditorGUILayout.PropertyField(_serializedObject.FindProperty("m_PackageVersion"));
                     EditorGUILayout.PropertyField(_serializedObject.FindProperty("m_LanguageVersion"));
+                    EditorGUILayout.PropertyField(_serializedObject.FindProperty("m_EnableNullable"));
                     EditorGUI.indentLevel--;
                 }