add IContentPack.WriteJsonFile method (#468)

docs/release-notes.md

@@ -1,6 +1,10 @@
 # Release notes
 ## 2.8 (upcoming)
-* Updated compatibility list.
+* For players:
+  * Updated compatibility list.
+
+* For modders:
+  * Added `IContentPack.WriteJsonFile` method.
 
 ## 2.7
 * For players:
@@ -14,6 +18,7 @@
   * Fixed `player_add` command not recognising return scepter.
   * Fixed `player_add` command showing fish twice.
   * Fixed some SMAPI logs not deleted when starting a new session.
+  * Updated compatibility list.
 
 * For modders:
   * Added support for `.json` data files in the content API (including Content Patcher).
@@ -25,7 +30,6 @@
   * All enums are now JSON-serialised by name instead of numeric value. (Previously only a few enums were serialised that way. JSON files which already have numeric enum values will still be parsed fine.)
   * Fixed false compatibility error when constructing multidimensional arrays.
   * Fixed `.ToSButton()` methods not being public.
-  * Updated compatibility list.
 
 * For SMAPI developers:
   * Dropped support for pre-SMAPI-2.6 update checks in the web API.  

src/SMAPI/Framework/ContentPack.cs

@@ -59,6 +59,16 @@ namespace StardewModdingAPI.Framework
                 : null;
         }
 
+        /// <summary>Save data to a JSON file in the content pack's folder.</summary>
+        /// <typeparam name="TModel">The model type. This should be a plain class that has public properties for the data you want. The properties can be complex types.</typeparam>
+        /// <param name="path">The file path relative to the mod folder.</param>
+        /// <param name="data">The arbitrary data to save.</param>
+        public void WriteJsonFile<TModel>(string path, TModel data) where TModel : class
+        {
+            path = Path.Combine(this.DirectoryPath, PathUtilities.NormalisePathSeparators(path));
+            this.JsonHelper.WriteJsonFile(path, data);
+        }
+
         /// <summary>Load content from the content pack folder (if not already cached), and return it. When loading a <c>.png</c> file, this must be called outside the game's draw loop.</summary>
         /// <typeparam name="T">The expected data type. The main supported types are <see cref="Map"/>, <see cref="Texture2D"/>, and dictionaries; other types may be supported by the game's content pipeline.</typeparam>
         /// <param name="key">The local path to a content file relative to the content pack folder.</param>

src/SMAPI/IContentPack.cs

@@ -22,11 +22,17 @@ namespace StardewModdingAPI
         ** Public methods
         *********/
         /// <summary>Read a JSON file from the content pack folder.</summary>
-        /// <typeparam name="TModel">The model type.</typeparam>
+        /// <typeparam name="TModel">The model type. This should be a plain class that has public properties for the data you want. The properties can be complex types.</typeparam>
         /// <param name="path">The file path relative to the content pack directory.</param>
         /// <returns>Returns the deserialised model, or <c>null</c> if the file doesn't exist or is empty.</returns>
         TModel ReadJsonFile<TModel>(string path) where TModel : class;
 
+        /// <summary>Save data to a JSON file in the content pack's folder.</summary>
+        /// <typeparam name="TModel">The model type. This should be a plain class that has public properties for the data you want. The properties can be complex types.</typeparam>
+        /// <param name="path">The file path relative to the mod folder.</param>
+        /// <param name="data">The arbitrary data to save.</param>
+        void WriteJsonFile<TModel>(string path, TModel data) where TModel : class;
+
         /// <summary>Load content from the content pack folder (if not already cached), and return it. When loading a <c>.png</c> file, this must be called outside the game's draw loop.</summary>
         /// <typeparam name="T">The expected data type. The main supported types are <see cref="Map"/>, <see cref="Texture2D"/>, and dictionaries; other types may be supported by the game's content pipeline.</typeparam>
         /// <param name="key">The local path to a content file relative to the content pack folder.</param>