CanonicalError.cs won't show error code

[coueslant]

Hi All,

I'm trying to use CanonicalError.cs to output custom warning messages to the Error List window for a build tool I'm creating. The function is great, I can see my warnings in the window and double click to be taken right to them, the only thing that isn't showing is the error codes I have for my warnings.

Here's a repro repository that exhibits the same behaviour, it shows a mimicked version of the object I use to build my messages as well as the exact code used to build them. You might need to change the path in AppUsingBuildTool.csproj in order to make it work, I wasn't too sure how to convert the path into a relative one so I've left it as an absolute as it is on my machine.

For a very brief period of time the warning messages did show the codes, and curiously every warning also showed its column to be 1 whilst the error codes were showing. Since then the codes and columns have not appeared again.

This is how I am calling the tool in my .csproj file:

  <Target Name="AfterBuild">
    <Exec Command="C:\Users\murray.coueslant\Documents\dev\MarkdownUtility\MarkdownUtility\bin\Debug\MarkdownUtility.exe lint -p docs -r" />
  </Target>

I know that the format of the messages have to be very specific, however I have checked the Regexes in CanonicalError.cs against my output using Regex Storm, and they seem to match fine. I can even see the code being shown in the CODE named group stemming from the following line in CanonicalError.cs when I test the pattern against the messages I create,

// Match anything starting with a space that's not a colon/space, followed by a colon.
// Error code is optional in which case "error"/"warning" can be followed immediately by a colon.
 + @"( \s*(?<CODE>[^: ]*))?\s*:"

Here is how I construct my error message, using data from another class inside the tool itself

Console.Out.WriteLine($"{file}({ruleTrigger.LineNumber}, {ruleTrigger.ColumnNumber}): test warning {ruleCode}: {ruleTrigger.RuleDescription} {ruleTrigger.RuleNotes}");

and here's what the build output in Visual Studio shows when the tool is run as an after build event in another project,

1>C:\Users\murray.coueslant\Documents\dev\BuildToolTest\BuildToolTest\docs\docs\07 Procedures\05 IT\04 Firewall.md(24, 1) : test warning MD040: Code fence has no language specified. Code fence on line 24 has no language specified. Correct by specifying a language right after the first set of delimiters.

I'm using Visual Studio 2017, and have MSBuild version 15.1.0.0.

If there is a better place that I should have asked this question, please let me know!

Thanks.

[livarcocc]

I am not familiar with how VS determines something should show up in the error list.

@davkean any pointers?