Remove hardcoded MSBuild version, get latest instead

Common.ps1

@@ -1,75 +1,91 @@
-# Builds all .slns recursively in Release mode, then 
-# pushes all resulting .nupkg in bin\Release folders
-# This function assumes it's called from the netfx root 
-# folder, with the relative path being the path to 
-# search for nugets.
-function Push-Packages
-{
-	param([string] $relativePath)
-
-	$apiKey = Get-Content apikey.txt
-
-	Build-Packages $relativePath
-
-	Write-Progress -Activity "Pushing" -Status "Publishing built packages recursively"
-
-	Get-ChildItem -Path $relativePath -Recurse -Filter *.nupkg | Where-Object { $_.DirectoryName.EndsWith("bin\Release") }  | %{ .\nuget.exe Push $_.FullName $apiKey }
-
-	Write-Progress -Activity "Pushing" -Status "Done!" -Completed
-}
-
-# Builds all .slns recursively in Release mode, then 
-# copies all resulting .nupkg in bin\Release folders
-# to the Drop folder.
-# This function assumes it's called from the netfx root 
-# folder, with the relative path being the path to 
-# search for nugets.
-function Drop-Packages
-{
-	param([string] $relativePath)
-
-	Build-Packages $relativePath
-
-	mkdir Drop -ea silentlycontinue
-	$dropDir = gci -Filter Drop
-	Write-Host "Drop location is " $dropDir.FullName
-
-	Get-ChildItem -Path $current -Recurse -Filter *.nupkg | `
-	Where-Object { $_.DirectoryName.EndsWith("bin\Release") }  | %{ `
-		$target = [System.IO.Path]::Combine($dropDir.FullName, $_.Name); `
-		[System.Threading.Thread]::Sleep(1000); `
-		$_.CopyTo($target, $true); }
-
-	Write-Progress -Activity "Deploying" -Status "Done!" -Completed
-}
-
-# Builds all .slns recursively in Release mode
-# This function assumes it's called from the netfx root 
-# folder, with the relative path being the path to 
-# search for nugets.
-function Build-Packages
-{
-	param([string] $relativePath)
-
-	$msbuild = [System.Environment]::ExpandEnvironmentVariables("%windir%\Microsoft.NET\Framework\v4.0.30319\MSBuild.exe")
-
-	Write-Progress -Activity "Building" -Status "Building release recursively"
-
-	# Build all extensions
-	foreach ($build in (Get-ChildItem -Path $relativePath -Recurse -Filter *.sln))
-	{
-		pushd $build.DirectoryName
-
-			$progress++
-			Write-Progress -Activity "Building" -Status ("Cleaning " + $build.Name) -PercentComplete $progress
-			&$msbuild /target:Clean /verbosity:quiet /p:Configuration=Debug | out-null
-			&$msbuild /target:Clean /verbosity:quiet /p:Configuration=Release | out-null
-
-			Write-Progress -Activity "Building" -Status ("Building " + $build.Name) -PercentComplete $progress
-			&$msbuild /verbosity:minimal /p:Configuration=Release /nologo
-
-		popd
-	}
-
-	Write-Progress -Activity "Building" -Status "Done!" -Completed
+# Builds all .slns recursively in Release mode, then 
+# pushes all resulting .nupkg in bin\Release folders
+# This function assumes it's called from the netfx root 
+# folder, with the relative path being the path to 
+# search for nugets.
+function Push-Packages
+{
+	param([string] $relativePath)
+
+	Build-Packages $relativePath
+
+	Write-Progress -Activity "Pushing" -Status "Publishing built packages recursively"
+
+	Get-ChildItem -Path $relativePath -Recurse -Filter *.nupkg | Where-Object { $_.DirectoryName.EndsWith("bin\Release") }  | %{ .\nuget.exe Push $_.FullName }
+
+	Write-Progress -Activity "Pushing" -Status "Done!" -Completed
+}
+
+# Builds all .slns recursively in Release mode, then 
+# copies all resulting .nupkg in bin\Release folders
+# to the Drop folder.
+# This function assumes it's called from the netfx root 
+# folder, with the relative path being the path to 
+# search for nugets.
+function Drop-Packages
+{
+	param([string] $relativePath)
+
+	Build-Packages $relativePath
+
+	mkdir Drop -ea silentlycontinue
+	$dropDir = gci -Filter Drop
+	Write-Host "Drop location is " $dropDir.FullName
+
+	Get-ChildItem -Path $current -Recurse -Filter *.nupkg | `
+	Where-Object { $_.DirectoryName.EndsWith("bin\Release") }  | %{ `
+		$target = [System.IO.Path]::Combine($dropDir.FullName, $_.Name); `
+		[System.Threading.Thread]::Sleep(1000); `
+		$_.CopyTo($target, $true); }
+
+	Write-Progress -Activity "Deploying" -Status "Done!" -Completed
+}
+
+# Builds all .slns recursively in Release mode
+# This function assumes it's called from the netfx root 
+# folder, with the relative path being the path to 
+# search for nugets.
+function Build-Packages
+{
+	param([string] $relativePath)
+
+	$msbuilds = @(get-command msbuild -ea SilentlyContinue)
+	if ($msbuilds.Count -eq 0) {
+		throw "MSBuild could not be found in the path. Please ensure MSBuild is in the path."
+	}
+
+	if (!(test-path ".\.nuget\NuGet.exe")) {
+		if (!(test-path ".\.nuget")) {
+			mkdir .nuget | out-null
+		}
+		write-host Downloading NuGet.exe...
+		invoke-webrequest "https://nuget.org/nuget.exe" -outfile ".\.nuget\NuGet.exe"
+	}
+
+	if (test-path ".\packages.config") {
+		write-host Installing root-level NuGet packages...
+		.\.nuget\NuGet.exe Install -OutputDirectory packages -ExcludeVersion
+	}
+
+	$msbuild = $msbuilds[0].Definition
+
+	Write-Progress -Activity "Building" -Status "Building release recursively"
+
+	# Build all extensions
+	foreach ($build in (Get-ChildItem -Path $relativePath -Recurse -Filter *.sln))
+	{
+		pushd $build.DirectoryName
+
+			$progress++
+			Write-Progress -Activity "Building" -Status ("Cleaning " + $build.Name) -PercentComplete $progress
+			&$msbuild /target:Clean /verbosity:quiet /p:Configuration=Debug | out-null
+			&$msbuild /target:Clean /verbosity:quiet /p:Configuration=Release | out-null
+
+			Write-Progress -Activity "Building" -Status ("Building " + $build.Name) -PercentComplete $progress
+			&$msbuild /verbosity:minimal /p:Configuration=Release /nologo
+
+		popd
+	}
+
+	Write-Progress -Activity "Building" -Status "Done!" -Completed
 }