Sync eng/common directory with azure-sdk-tools repository for Tools P…

…R 974

eng/common/scripts/common.ps1

@@ -20,7 +20,7 @@ $EngScriptsLanguageSettings = Join-path $EngScriptsDir "Language-Settings.ps1"
 if (Test-Path $EngScriptsLanguageSettings) {
   . $EngScriptsLanguageSettings
 }
-If ($LanguageShort -eq $null)
+if ($null -eq $LanguageShort)
 {
   $LangaugeShort = $Language
 }

eng/common/scripts/logging.ps1

@@ -0,0 +1,40 @@
+if ($null -eq $isDevOpsRun)
+{
+  $isDevOpsRun = ($null -ne $env:SYSTEM_TEAMPROJECTID)
+}
+
+function LogWarning
+{
+    if ($isDevOpsRun) 
+    {
+        Write-Host "##vso[task.LogIssue type=warning;]$args"
+    }
+    else
+    {
+        Write-Warning "$args"
+    }
+}
+
+function LogError
+{
+    if ($isDevOpsRun) 
+    {
+        Write-Host "##vso[task.LogIssue type=error;]$args"
+    }
+    else 
+    {
+        Write-Error "$args"
+    }
+}
+
+function LogDebug
+{
+    if ($isDevOpsRun) 
+    {
+        Write-Host "##vso[task.LogIssue type=debug;]$args"
+    }
+    else 
+    {
+        Write-Debug "$args"
+    }
+}