init: Check if nanoFramework is already installed

Author: angularsen

Build/init.ps1

@@ -14,29 +14,31 @@ if (-not (Test-Path "$root/Tools/reportgenerator.exe")) {
   Write-Host -Foreground Green "Download dotnet-reportgenerator-globaltool...OK."
 }
 
+$VsWherePath = "${env:PROGRAMFILES(X86)}\Microsoft Visual Studio\Installer\vswhere.exe"
+$VsPath = $(&$VsWherePath -latest -property installationPath)
+$msbuildPath = Join-Path -Path $VsPath -ChildPath "\MSBuild"
+
 # Install .NET nanoFramework build components
+if (!(Test-Path "$msbuildPath/nanoFramework")) {
+  Write-Host "Installing .NET nanoFramework VS extension..."
 
-Write-Host "Installing .NET nanoFramework VS extension..."
+  [System.Net.WebClient]$webClient = New-Object System.Net.WebClient
+  $webClient.UseDefaultCredentials = $true
 
-[System.Net.WebClient]$webClient = New-Object System.Net.WebClient
-$webClient.UseDefaultCredentials = $true
+  $vsixFeedXml = Join-Path -Path $tempDir -ChildPath "vs-extension-feed.xml"
+  $webClient.DownloadFile("http://vsixgallery.com/feed/author/nanoframework", $vsixFeedXml)
+  [xml]$feedDetails = Get-Content $vsixFeedXml
 
-$vsixFeedXml = Join-Path -Path $tempDir -ChildPath "vs-extension-feed.xml"
-$webClient.DownloadFile("http://vsixgallery.com/feed/author/nanoframework", $vsixFeedXml)
-[xml]$feedDetails = Get-Content $vsixFeedXml
+  $extensionUrl = $feedDetails.feed.entry[1].content.src
+  $vsixPath = Join-Path -Path $tempDir -ChildPath "nf-extension.zip"
+  $extensionVersion = $feedDetails.feed.entry[0].Vsix.Version
+  $webClient.DownloadFile($extensionUrl,$vsixPath)
+  Expand-Archive -LiteralPath $vsixPath -DestinationPath $tempDir\nf-extension\ | Write-Host
 
-$extensionUrl = $feedDetails.feed.entry[1].content.src
-$vsixPath = Join-Path -Path $tempDir -ChildPath "nf-extension.zip"
-$extensionVersion = $feedDetails.feed.entry[0].Vsix.Version
-$webClient.DownloadFile($extensionUrl,$vsixPath)
-Expand-Archive -LiteralPath $vsixPath -DestinationPath $tempDir\nf-extension\ | Write-Host
+  Copy-Item -Path "$tempDir\nf-extension\`$MSBuild\nanoFramework" -Destination $msbuildPath -Recurse
 
-$VsWherePath = "${env:PROGRAMFILES(X86)}\Microsoft Visual Studio\Installer\vswhere.exe"
-$VsPath = $(&$VsWherePath -latest -property installationPath)
-$msbuildPath = Join-Path -Path $VsPath -ChildPath "\MSBuild"
-Copy-Item -Path "$tempDir\nf-extension\`$MSBuild\nanoFramework" -Destination $msbuildPath -Recurse
-
-Write-Host "Installed VS extension v$extensionVersion"
+  Write-Host "Installed VS extension v$extensionVersion"
+}
 
 # Cleanup
 [system.io.Directory]::Delete($tempDir, $true) | out-null