Added UNSAFE_MigrationHelper to help with upgrades

LibationLauncher/UNSAFE_MigrationHelper.cs

@@ -0,0 +1,145 @@
+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+using Dinah.Core;
+using Newtonsoft.Json;
+using Newtonsoft.Json.Linq;
+
+namespace LibationLauncher
+{
+	/// <summary>for migrations only. directly manipulatings settings files without going through domain logic</summary>
+	internal static class UNSAFE_MigrationHelper
+	{
+		#region appsettings.json
+		public const string APPSETTINGS_JSON = "appsettings.json";
+
+		public static bool AppSettingsJson_Exists => File.Exists(APPSETTINGS_JSON);
+
+		public static string AppSettings_Get(string key)
+		{
+			bool success = false;
+			JToken val = null;
+
+			process_AppSettingsJson(jObj => success = jObj.TryGetValue(key, out val), false);
+
+			if (success)
+				return val.Value<string>();
+			return null;
+		}
+
+		/// <summary>only insert if not exists</summary>
+		public static void AppSettings_Insert(string key, string value)
+			=> process_AppSettingsJson(jObj => jObj.TryAdd(key, value));
+
+		/// <summary>only update if exists</summary>
+		public static void AppSettings_Update(string key, string value)
+			=> process_AppSettingsJson(jObj => {
+				if (jObj.ContainsKey(key))
+					jObj[key] = value;
+			});
+
+		/// <summary>only delete if exists</summary>
+		public static void AppSettings_Delete(string key)
+			=> process_AppSettingsJson(jObj => {
+				if (jObj.ContainsKey(key))
+					jObj.Remove(key);
+			});
+
+		/// <param name="save">True: save if contents changed. False: no not attempt save</param>
+		private static void process_AppSettingsJson(Action<JObject> action, bool save = true)
+		{
+			// only insert if not exists
+			if (!AppSettingsJson_Exists)
+				return;
+
+			var startingContents = File.ReadAllText(APPSETTINGS_JSON);
+			var jObj = JObject.Parse(startingContents);
+
+			action(jObj);
+
+			if (!save)
+				return;
+
+			// only save if different
+			var endingContents_indented = jObj.ToString(Formatting.Indented);
+			var endingContents_compact = jObj.ToString(Formatting.None);
+			if (startingContents.EqualsInsensitive(endingContents_indented) || startingContents.EqualsInsensitive(endingContents_compact))
+				return;
+
+			File.WriteAllText(APPSETTINGS_JSON, endingContents_indented);
+			System.Threading.Thread.Sleep(100);
+		}
+		#endregion
+
+		#region Settings.json
+		public const string LIBATION_FILES_KEY = "LibationFiles";
+		public const string SETTINGS_JSON = "Settings.json";
+
+		public static string SettingsJsonPath
+		{
+			get
+			{
+				var value = AppSettings_Get(LIBATION_FILES_KEY);
+				return value is null ? null : Path.Combine(value, SETTINGS_JSON);
+			}
+		}
+		public static bool SettingsJson_Exists => SettingsJsonPath is not null && File.Exists(SettingsJsonPath);
+
+		public static string Settings_Get(string key)
+		{
+			bool success = false;
+			JToken val = null;
+
+			process_SettingsJson(jObj => success = jObj.TryGetValue(key, out val), false);
+
+			if (success)
+				return val.Value<string>();
+			return null;
+		}
+
+		/// <summary>only insert if not exists</summary>
+		public static void Settings_Insert(string key, string value)
+			=> process_SettingsJson(jObj => jObj.TryAdd(key, value));
+
+		/// <summary>only update if exists</summary>
+		public static void Settings_Update(string key, string value)
+			=> process_SettingsJson(jObj => {
+				if (jObj.ContainsKey(key))
+					jObj[key] = value;
+			});
+
+		/// <summary>only delete if exists</summary>
+		public static void Settings_Delete(string key)
+			=> process_SettingsJson(jObj => {
+				if (jObj.ContainsKey(key))
+					jObj.Remove(key);
+			});
+
+		/// <param name="save">True: save if contents changed. False: no not attempt save</param>
+		private static void process_SettingsJson(Action<JObject> action, bool save = true)
+		{
+			// only insert if not exists
+			if (!SettingsJson_Exists)
+				return;
+
+			var startingContents = File.ReadAllText(SettingsJsonPath);
+			var jObj = JObject.Parse(startingContents);
+
+			action(jObj);
+
+			if (!save)
+				return;
+
+			// only save if different
+			var endingContents_indented = jObj.ToString(Formatting.Indented);
+			var endingContents_compact = jObj.ToString(Formatting.None);
+			if (startingContents.EqualsInsensitive(endingContents_indented) || startingContents.EqualsInsensitive(endingContents_compact))
+				return;
+
+			File.WriteAllText(SettingsJsonPath, endingContents_indented);
+			System.Threading.Thread.Sleep(100);
+		}
+		#endregion
+	}
+}