Add GitHub Actions error parsing.

Author: tillig

.github/workflows/build.yml

@@ -19,8 +19,10 @@ jobs:
       with:
         dotnet-version: 8.0.x
     - name: Build and test
-      run: dotnet msbuild ./default.proj
-
+      shell: pwsh
+      run: |
+        dotnet msbuild ./default.proj
+        ./build/ConvertTo-GitHubActionsOutput.ps1 -Path ./artifacts/logs/dotnet-build-issues.log
 # TODO: Can we parse the build output logs to provide better warning/error feedback?
 # TODO: Upload to CodeCov should be part of the GitHub actions.
 # TODO: Upload to GitHub packages instead of MyGet in GitHub actions for master and develop.

build/ConvertTo-GitHubActionsOutput.ps1

@@ -0,0 +1,49 @@
+<#
+.SYNOPSIS
+    Converts an MSBuild issues log into build output for GitHub Actions.
+.DESCRIPTION
+    Rather than simply failing the build and having to figure out what the error
+    was, this script takes the output from an MSBuild execution and converts
+    warnings/errors into GitHub Actions format for easier readability.
+.PARAMETER Path
+    Path to the MSBuild issues log.
+.EXAMPLE
+    ConvertTo-GitHubActionsOutput -Path ./artifacts/dotnet-build-issues.log
+
+    Converts the default log output into GitHub Actions format.
+#>
+[CmdletBinding(SupportsShouldProcess = $False)]
+Param(
+    [Parameter(Mandatory = $True)]
+    [string]
+    $Path
+)
+
+Begin {
+    If (-not (Test-Path $Path)) {
+        Exit 0
+    }
+}
+
+Process {
+    Get-Content $Path | ForEach-Object {
+        If ($_ -match '^(?:\s+\d+>)?([^\s].*)\((\d+|\d+,\d+|\d+,\d+,\d+,\d+)\)\s*:\s+(error|warning)\s+(\w{1,2}\d+)\s*:\s*(.*)$') {
+            $File = $Matches[1]
+            $Severity = $Matches[3]
+            If ($Severity -ne 'warning') {
+                $Severity = 'error'
+            }
+            $Code = $Matches[4]
+            $Message = $Matches[5].Trim()
+            $LineNumberData = $Matches[2]
+            $Col = 0
+            $LineNumber = $LineNumberData
+            If ($LineNumberData.IndexOf(',') -ge 0) {
+                $Col = $LineNumberData -replace '[^,]+,',''
+                $LineNumber = $LineNumberData -replace ',[^,]+',''
+            }
+
+            Write-Host "::$Severity file=$File,line=$LineNumber,col=$Col,title=$Code::$Message"
+        }
+    }
+}

default.proj

@@ -36,7 +36,7 @@
     <CleanDirectory Include="$(ArtifactDirectory)" />
     <SourceProject Include="$(MSBuildProjectDirectory)/src/**/*.csproj" />
     <TestProject Include="$(MSBuildProjectDirectory)/test/**/*.csproj" />
-    <SolutionFile Include="*.sln" />
+    <SolutionFile Include="Autofac.sln" />
   </ItemGroup>
   <Target Name="All">
     <Message Text="****************************************" Importance="high" />
@@ -59,7 +59,7 @@
   </Target>
   <Target Name="Compile">
     <Exec Command="dotnet --info" />
-    <Exec Command="dotnet build &quot;%(SolutionFile.FullPath)&quot; -c $(Configuration) /p:Version=$(Version) -flp:v=q -flp:logfile=$(LogDirectory)/dotnet-buildissues.log" />
+    <Exec Command="dotnet build &quot;%(SolutionFile.FullPath)&quot; -c $(Configuration) /p:Version=$(Version) -flp:v=q -flp:logfile=$(LogDirectory)/dotnet-build-issues.log" />
   </Target>
   <Target Name="Package">
     <MakeDir Directories="$([System.IO.Path]::Combine($(PackageDirectory),%(PublishProject.Filename)))" />