migrate to dotnet-format tool (#2016)

* migrate to new dotnet-format tool in build script (run on local build)
* reformat code

build/Tasks/FormatCode.cs

@@ -1,76 +1,15 @@
-using System;
-using System.IO;
-using System.Linq;
-using Cake.Common;
-using Cake.Common.Diagnostics;
-using Cake.Core;
-using Cake.Core.IO;
+using Cake.Common.Tools.DotNetCore;
 using Cake.Frosting;
 
 public sealed class FormatCode : FrostingTask<Context>
 {
     public override void Run(Context context)
     {
-        var codeFormatterExe = context.FileSystem
-            .GetDirectory("tools")
-            .GetFiles("CodeFormatter.exe", SearchScope.Recursive)
-            .First()
-            .Path
-            .MakeAbsolute(context.Environment);
-
-        foreach (var project in context.Projects)
-        {
-            context.Information("Formatting code of {0}", project.Name);
-
-            var tempCsprojFile = CreateTempCsproj(context, project.Name);
-            context.Information("Generated temporary {0} file to run the formatter", new FilePath(tempCsprojFile).GetFilename());
-
-            var exitCode = context.StartProcess(
-                codeFormatterExe,
-                $"{tempCsprojFile} /nocopyright /nounicode");
-
-            if (exitCode != 0)
-            {
-                throw new CakeException($"An error occured while formatting code of {project.Name}");
-            }
-        }
-
-        context.Information("Successfully formatted code of all the projects");
+        context.DotNetCoreTool("format");
     }
 
     public override bool ShouldRun(Context context)
     {
-        // Core only builds do not download the formatter exe
-        // Only windows is guaranteed to be able to run exe files in the first place
-        return context.IsRunningOnWindows() && !context.CoreOnly;
-    }
-
-    private static string CreateTempCsproj(Context context, string projectName)
-    {
-        DirectoryPath tempFolder = System.IO.Path.GetTempPath();
-        var projectCsproj = tempFolder.CombineWithFilePath($"{projectName}.csproj").FullPath;
-
-        var files = context.FileSystem
-            .GetDirectory(projectName)
-            .GetFiles("*.cs", SearchScope.Recursive)
-            .Select(x => x.Path.MakeAbsolute(context.Environment))
-            .ToArray();
-
-        var compileElements = files
-            .Select(x => $"<Compile Include=\"{x}\" />")
-            .ToArray();
-
-        var csprojContent =
-$@"<?xml version=""1.0"" encoding=""utf-8""?>
-<Project ToolsVersion=""4.0"" DefaultTargets=""Build"" xmlns=""http://schemas.microsoft.com/developer/msbuild/2003"">
-  <ItemGroup>
-    {string.Join(Environment.NewLine, compileElements)}
-  </ItemGroup>
-  <Import Project=""$(MSBuildToolsPath)\Microsoft.CSharp.targets"" />
-</Project>";
-
-        File.WriteAllText(projectCsproj, csprojContent);
-
-        return projectCsproj;
+        return context.IsLocalBuild;
     }
 }