Refactor logging

src/Pretzel.Logic/Extensions/Logger.cs

@@ -5,30 +5,36 @@ namespace Pretzel.Logic.Extensions
 {
     public class Logger
     {
-        private readonly List<string> categories;
+        private readonly List<Tracing.Category> categories;
         private TextWriter writer;
 
         public Logger()
         {
-            categories = new List<string>();
+            categories = new List<Tracing.Category>();
         }
 
         public void SetWriter(TextWriter textWriter)
         {
             writer = textWriter;
         }
 
-        public void AddCategory(string category)
+        public void AddCategory(Tracing.Category category)
         {
             categories.Add(category);
         }
 
-        public void Write(string message, string category)
+        public void Write(string message, Tracing.Category category)
         {
             if (writer == null) return;
 
             if (categories.Contains(category))
+            {
                 writer.WriteLine(message);
+                if (category == Tracing.Category.Error) 
+                {
+                    writer.Flush();
+                }
+            }
         }
     }
 }

src/Pretzel.Logic/Extensions/Tracing.cs

@@ -4,6 +4,12 @@ namespace Pretzel.Logic.Extensions
 {
     public static class Tracing
     {
+        public enum Category {
+            Debug,
+            Info,
+            Error
+        }
+
         static Tracing()
         {
             Logger = new Logger();
@@ -13,17 +19,17 @@ static Tracing()
 
         public static void Debug(string message)
         {
-            Logger.Write(message, "debug");
+            Logger.Write(message, Category.Debug);
         }
 
         public static void Info(string message)
         {
-            Logger.Write(message, "info");
+            Logger.Write(message, Category.Info);
         }
 
         public static void Error(string message)
         {
-            Logger.Write(message, "error");
+            Logger.Write(message, Category.Error);
         }
     }
 }

src/Pretzel.Logic/Templating/Razor/RazorSiteEngine.cs

@@ -7,6 +7,7 @@
 using System.ComponentModel.Composition;
 using System.IO;
 using System.Text.RegularExpressions;
+using Pretzel.Logic.Extensions;
 
 namespace Pretzel.Logic.Templating.Razor
 {
@@ -48,10 +49,11 @@ protected override string RenderTemplate(string content, PageContext pageData)
             {
                 return Engine.Razor.RunCompile(content, pageData.Page.File, typeof(PageContext), pageData);
             }
-            catch (Exception ex)
+            catch (Exception e)
             {
-                Tracing.Debug(ex.Message + Environment.NewLine + ex.StackTrace);
-                Console.WriteLine(@"Failed to render template, falling back to direct content");
+                Tracing.Error(@"Failed to render template, falling back to direct content");
+                Tracing.Debug(e.Message);
+                Tracing.Debug(e.StackTrace);
                 return content;
             }
         }

src/Pretzel.Tests/Import/BloggerImportTests.cs

@@ -116,8 +116,8 @@ public void Error_on_write_is_traced()
             StringBuilder sb = new StringBuilder();
             TextWriter writer = new StringWriter(sb);
             Tracing.Logger.SetWriter(writer);
-            Tracing.Logger.AddCategory("info");
-            Tracing.Logger.AddCategory("debug");
+            Tracing.Logger.AddCategory(Tracing.Category.Info);
+            Tracing.Logger.AddCategory(Tracing.Category.Debug);
 
             var fileSubstitute = Substitute.For<FileBase>();
             fileSubstitute.ReadAllText(ImportFile).Returns(ImportContent);

src/Pretzel.Tests/Import/HtmlToMarkdownConverterTests.cs

@@ -151,7 +151,7 @@ public void Unknown_node_is_traced_and_child_processed()
             StringBuilder sb = new StringBuilder();
             TextWriter writer = new StringWriter(sb);
             Tracing.Logger.SetWriter(writer);
-            Tracing.Logger.AddCategory("info");
+            Tracing.Logger.AddCategory(Tracing.Category.Info);
 
             // act
             string markdown = converter.Convert("<body><b>hello</b><br/><em>world</em></body>");

src/Pretzel.Tests/Recipe/RecipeTests.cs

@@ -26,8 +26,8 @@ public RecipeTests()
         {
             writer = new StringWriter(sb);
             Tracing.Logger.SetWriter(writer);
-            Tracing.Logger.AddCategory("info");
-            Tracing.Logger.AddCategory("error");
+            Tracing.Logger.AddCategory(Tracing.Category.Info);
+            Tracing.Logger.AddCategory(Tracing.Category.Error);
         }
 
         [Fact]

src/Pretzel.Tests/Templating/Context/SiteContextGeneratorTests.cs

@@ -893,8 +893,8 @@ public void page_with_false_date_is_not_processed()
             StringBuilder sb = new StringBuilder();
             TextWriter writer = new StringWriter(sb);
             Tracing.Logger.SetWriter(writer);
-            Tracing.Logger.AddCategory("info");
-            Tracing.Logger.AddCategory("debug");
+            Tracing.Logger.AddCategory(Tracing.Category.Info);
+            Tracing.Logger.AddCategory(Tracing.Category.Error);
 
             // act
             var siteContext = generator.BuildContext(@"C:\TestSite", @"C:\TestSite\_site", false);
@@ -930,8 +930,8 @@ public void render_with_ContentTransformer_exception_should_trace_the_error()
             StringBuilder sb = new StringBuilder();
             TextWriter writer = new StringWriter(sb);
             Tracing.Logger.SetWriter(writer);
-            Tracing.Logger.AddCategory("info");
-            Tracing.Logger.AddCategory("debug");
+            Tracing.Logger.AddCategory(Tracing.Category.Info);
+            Tracing.Logger.AddCategory(Tracing.Category.Error);
 
             var contentTransformer = Substitute.For<IContentTransform>();
             contentTransformer.Transform(Arg.Any<string>()).Returns(s => { throw new Exception("foo bar"); });
@@ -1027,8 +1027,8 @@ public void file_with_2_ioexception_on_ReadAllText_is_not_processed_and_exceptio
             StringBuilder sb = new StringBuilder();
             TextWriter writer = new StringWriter(sb);
             Tracing.Logger.SetWriter(writer);
-            Tracing.Logger.AddCategory("info");
-            Tracing.Logger.AddCategory("debug");
+            Tracing.Logger.AddCategory(Tracing.Category.Info);
+            Tracing.Logger.AddCategory(Tracing.Category.Error);
 
             var generator = new SiteContextGenerator(fileSystemSubstitute, Enumerable.Empty<IContentTransform>(), new LinkHelper());
 

src/Pretzel/Program.cs

@@ -23,14 +23,14 @@ internal class Program
         private static void Main(string[] args)
         {
             Tracing.Logger.SetWriter(Console.Out);
-            Tracing.Logger.AddCategory("info");
-            Tracing.Logger.AddCategory("error");
+            Tracing.Logger.AddCategory(Tracing.Category.Info);
+            Tracing.Logger.AddCategory(Tracing.Category.Error);
 
             var parameters = BaseParameters.Parse(args, new FileSystem());
 
             if (parameters.Debug)
             {
-                Tracing.Logger.AddCategory("debug");
+                Tracing.Logger.AddCategory(Tracing.Category.Debug);
             }
 
             var program = new Program();