Appveyor (dotnet#4)

appveyor.yml

@@ -0,0 +1,6 @@
+version: 1.0.{build}
+install:
+- ps: fcs/installSDK.ps1
+build_script:
+- cmd: fcs/build.cmd
+test: off

fcs/installSDK.ps1

@@ -0,0 +1,27 @@
+# Ensures that .net core is up to date.
+# first get the required version from global.json
+$json = ConvertFrom-Json (Get-Content "$PSScriptRoot/global.json" -Raw)
+$required_version = $json.sdk.version
+
+# Running dotnet --version stupidly fails if the required SDK version is higher 
+# than the currently installed version. So move global.json out the way 
+# and then put it back again 
+Rename-Item "$PSScriptRoot/global.json" "$PSScriptRoot/global.json.bak"
+$current_version = (dotnet --version)
+Rename-Item "$PSScriptRoot/global.json.bak" "$PSScriptRoot/global.json"
+Write-Host "Required .NET version: $required_version, Installed: $current_version"
+
+if ($current_version -lt $required_version) {
+  # Current installed version is too low.
+  # Install new version as a local only dependency. 
+  $urlCurrent = "https://dotnetcli.blob.core.windows.net/dotnet/Sdk/$required_version/dotnet-sdk-$required_version-win-x64.zip"
+  Write-Host "Installing .NET Core $required_version from $urlCurrent"
+  $env:DOTNET_INSTALL_DIR = "$PSScriptRoot/.dotnetsdk"
+  New-Item -Type Directory $env:DOTNET_INSTALL_DIR -Force | Out-Null
+  (New-Object System.Net.WebClient).DownloadFile($urlCurrent, "dotnet.zip")
+  Write-Host "Unzipping to $env:DOTNET_INSTALL_DIR"
+  Add-Type -AssemblyName System.IO.Compression.FileSystem; [System.IO.Compression.ZipFile]::ExtractToDirectory("dotnet.zip", $env:DOTNET_INSTALL_DIR)
+
+  Write-Host "Using .NET SDK from $env:DOTNET_INSTALL_DIR"
+  $env:PATH = "$env:DOTNET_INSTALL_DIR;$env:PATH"
+}