reading from embedded resource instead of file

ICSharpCode.ILSpyX/MermaidDiagrammer/EmbeddedResource.cs

@@ -0,0 +1,56 @@
+// Copyright (c) 2024 Holger Schmidt
+// 
+// Permission is hereby granted, free of charge, to any person obtaining a copy of this
+// software and associated documentation files (the "Software"), to deal in the Software
+// without restriction, including without limitation the rights to use, copy, modify, merge,
+// publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons
+// to whom the Software is furnished to do so, subject to the following conditions:
+// 
+// The above copyright notice and this permission notice shall be included in all copies or
+// substantial portions of the Software.
+// 
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
+// INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
+// PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE
+// FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
+// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+// DEALINGS IN THE SOFTWARE.
+
+using System.IO;
+
+namespace ICSharpCode.ILSpyX.MermaidDiagrammer
+{
+	public partial class GenerateHtmlDiagrammer
+	{
+		/// <summary>A helper for loading resources embedded in the nested html folder.</summary>
+		private static class EmbeddedResource
+		{
+			internal static string ReadText(string resourceName)
+			{
+				Stream stream = GetStream(resourceName);
+				using StreamReader reader = new(stream);
+				return reader.ReadToEnd();
+			}
+
+			internal static void CopyTo(string outputFolder, string resourceName)
+			{
+				Stream resourceStream = GetStream(resourceName);
+				using FileStream output = new(Path.Combine(outputFolder, resourceName), FileMode.Create, FileAccess.Write);
+				resourceStream.CopyTo(output);
+			}
+
+			private static Stream GetStream(string resourceName)
+			{
+				var type = typeof(EmbeddedResource);
+				var assembly = type.Assembly;
+				var fullResourceName = $"{type.Namespace}.html.{resourceName}";
+				Stream? stream = assembly.GetManifestResourceStream(fullResourceName);
+
+				if (stream == null)
+					throw new FileNotFoundException("Resource not found.", fullResourceName);
+
+				return stream;
+			}
+		}
+	}
+}

ICSharpCode.ILSpyX/MermaidDiagrammer/Generator.Run.cs

@@ -90,14 +90,10 @@ namespace ICSharpCode.ILSpyX.MermaidDiagrammer
 
 		private void GenerateOutput(string assemblyPath, ClassDiagrammer model)
 		{
-			var htmlSourcePath = Path.Combine(AppDomain.CurrentDomain.BaseDirectory, "html");
 			string modelJson = SerializeModel(model);
 
-			var outputFolder = OutputFolder ??
+			// If no out folder is specified, default to a "netAmermaid" folder next to the input assembly.
-				/* If no out folder is specified and export mode is JsonOnly,
+			var outputFolder = OutputFolder ?? Path.Combine(Path.GetDirectoryName(assemblyPath) ?? string.Empty, "netAmermaid");
-                 * default to the HTML diagrammer source folder -  that's where it's most likely used.
-                 * Otherwise default to a "netAmermaid" folder next to the input assembly. */
-				(JsonOnly ? htmlSourcePath : Path.Combine(Path.GetDirectoryName(assemblyPath) ?? string.Empty, "netAmermaid"));
 
 			if (!Directory.Exists(outputFolder))
 				Directory.CreateDirectory(outputFolder);
@@ -109,7 +105,7 @@ namespace ICSharpCode.ILSpyX.MermaidDiagrammer
 			}
 			else
 			{
-				var htmlTemplate = File.ReadAllText(Path.Combine(htmlSourcePath, "template.html"));
+				var htmlTemplate = EmbeddedResource.ReadText("template.html");
 
 				var html = htmlTemplate
 					.Replace("{{SourceAssemblyName}}", model.SourceAssemblyName)
@@ -121,8 +117,8 @@ namespace ICSharpCode.ILSpyX.MermaidDiagrammer
 				File.WriteAllText(Path.Combine(outputFolder, "class-diagrammer.html"), html);
 
 				// copy required resources to output folder while flattening paths if required
-				foreach (var path in new[] { "styles.css", "netAmermaid.ico", "script.js" })
+				foreach (var resource in new[] { "styles.css", "netAmermaid.ico", "script.js" })
-					File.Copy(Path.Combine(htmlSourcePath, path), Path.Combine(outputFolder, Path.GetFileName(path)), overwrite: true);
+					EmbeddedResource.CopyTo(outputFolder, resource);
 
 				Console.WriteLine("Successfully generated HTML diagrammer.");
 			}