Support typespec to sdk preview pipeline (Azure#38576)

* Add changes to support typespec preview pipeline

* Revert whitespace changes

* Improve error logging in Update-dotnet-GeneratedSdks

eng/scripts/Language-Settings.ps1

@@ -419,7 +419,7 @@ function EnsureCustomSource($package) {
       -AllVersions `
       -AllowPrereleaseVersions
 
-      if (!$? -or !$existingVersions) { 
+      if (!$? -or !$existingVersions) {
         Write-Host "Failed to find package $($package.Name) in custom source $customPackageSource"
         return $package
       }
@@ -495,19 +495,19 @@ function UpdateDocsMsPackages($DocConfigFile, $Mode, $DocsMetadata) {
       continue
     }
 
-    if ($matchingPublishedPackage.Support -eq 'deprecated') { 
-      if ($Mode -eq 'legacy') { 
+    if ($matchingPublishedPackage.Support -eq 'deprecated') {
+      if ($Mode -eq 'legacy') {
 
         # Select the GA version, if none use the preview version
         $updatedVersion = $matchingPublishedPackage.VersionGA.Trim()
-        if (!$updatedVersion) { 
+        if (!$updatedVersion) {
           $updatedVersion = $matchingPublishedPackage.VersionPreview.Trim()
         }
         $package.Versions = @($updatedVersion)
 
         Write-Host "Add deprecated package to legacy moniker: $($package.Name)"
         $outputPackages += $package
-      } else { 
+      } else {
         Write-Host "Removing deprecated package: $($package.Name)"
       }
 
@@ -586,3 +586,44 @@ function Get-dotnet-EmitterName() {
 function Get-dotnet-EmitterAdditionalOptions([string]$projectDirectory) {
   return "--option @azure-tools/typespec-csharp.emitter-output-dir=$projectDirectory/src"
 }
+
+function Update-dotnet-GeneratedSdks([string]$PackageDirectoriesFile) {
+  $showSummary = ($env:SYSTEM_DEBUG -eq 'true') -or ($VerbosePreference -ne 'SilentlyContinue')
+  $summaryArgs = $showSummary ? "/v:n /ds" : ""
+
+  $packageDirectories = Get-Content $PackageDirectoriesFile | ConvertFrom-Json
+
+  $directoriesWithErrors = @()
+
+  Invoke-LoggedCommand "npm install -g autorest"
+
+  foreach ($directory in $packageDirectories) {
+    Push-Location $RepoRoot
+    try {
+      Write-Host "`n`n======================================================================"
+      Write-Host "Generating projects under directory '$directory'" -ForegroundColor Yellow
+      Write-Host "======================================================================`n"
+
+      Invoke-LoggedCommand "dotnet msbuild /restore /t:GenerateCode /p:Scope=`"$directory`" $summaryArgs eng\service.proj" -GroupOutput
+    }
+    catch {
+      Write-Host "##[error]Error generating project under directory $directory"
+      Write-Host $_.Exception.Message
+      $directoriesWithErrors += $directory
+    }
+    finally {
+      Pop-Location
+    }
+  }
+
+  if($directoriesWithErrors.Count -gt 0) {
+    Write-Host "##[error]Generation errors found in $($directoriesWithErrors.Count) directories:"
+
+    foreach ($directory in $directoriesWithErrors) {
+      Write-Host "  $directory"
+    }
+
+    exit 1
+  }
+
+}