Add a build task to validate LINQPad samples (octokit#1551)

* add a build task to run LINQPad samples

* make modifications to the validation of LINQPad samples

* rename the CAKE task to its original name ValidateLINQPadSamples
* rename the LINQPad samples file so they get executed in ordinal order (1, 2, ..., 10 and not 1, 10, 2, ...)

* remove openssl linking in TravisCI when on macOS

.gitignore

@@ -103,4 +103,5 @@ Backup/
 !.vscode/launch.json
 
 # CAKE
-tools/
+tools/*
+!tools/LINQPad

.travis.yml

@@ -10,9 +10,6 @@ matrix:
       osx_image: xcode8
       dotnet: 1.0.0-preview2-003121
 
-before_install:
-  - if test "$TRAVIS_OS_NAME" == "osx"; then ln -s /usr/local/opt/openssl/lib/libcrypto.1.0.0.dylib /usr/local/lib/; ln -s /usr/local/opt/openssl/lib/libssl.1.0.0.dylib /usr/local/lib/; fi
-
 script:
   - dotnet --info
   - ./build.sh

build/Tasks/LinkSources.cs

@@ -1,9 +1,9 @@
-using Cake.Common.Build;
+using System.Linq;
+using Cake.Common;
+using Cake.Common.Build;
 using Cake.Common.Diagnostics;
-using Cake.Core;
 using Cake.Core.IO;
 using Cake.Frosting;
-using System.Linq;
 
 [Dependency(typeof(Build))]
 public class LinkSources : FrostingTask<BuildContext>
@@ -43,6 +43,6 @@ public override void Run(BuildContext context)
 
     public override bool ShouldRun(BuildContext context)
     {
-        return !context.Environment.Platform.IsUnix();
+        return context.IsRunningOnWindows();
     }
 }

build/Tasks/Package.cs

@@ -5,6 +5,7 @@
 
 [Dependency(typeof(UnitTests))]
 [Dependency(typeof(LinkSources))]
+[Dependency(typeof(ValidateLINQPadSamples))]
 public class Package : FrostingTask<BuildContext>
 {
     public override void Run(BuildContext context)

build/Tasks/ValidateLINQPadSamples.cs

@@ -0,0 +1,114 @@
+using System;
+using System.IO;
+using System.Linq;
+using System.Xml.Linq;
+using Cake.Common;
+using Cake.Common.Diagnostics;
+using Cake.Core;
+using Cake.Core.IO;
+using Cake.Frosting;
+
+[Dependency(typeof(Build))]
+public class ValidateLINQPadSamples : FrostingTask<BuildContext>
+{
+    public override void Run(BuildContext context)
+    {
+        var assembliesDirectoryPath = context.Environment.WorkingDirectory
+            .Combine("Octokit.Reactive")
+            .Combine("bin")
+            .Combine(context.Configuration)
+            .Combine("net45")
+            .MakeAbsolute(context.Environment)
+            .FullPath;
+
+        var linqpadSamples = context.FileSystem
+            .GetDirectory("samples/linqpad-samples")
+            .GetFiles("*.linq", SearchScope.Current)
+            .Select(x => x.Path)
+            .ToArray();
+
+        var linqpadExe = context.Environment.WorkingDirectory
+            .Combine("tools")
+            .Combine("LINQPad")
+            .CombineWithFilePath("lprun.exe")
+            .MakeAbsolute(context.Environment);
+
+        foreach (var linqpadSample in linqpadSamples)
+        {
+            var sampleName = linqpadSample.GetFilename();
+            var rewrittenSample = RewriteLinqpadScriptToUseLocalAssemblies(assembliesDirectoryPath, linqpadSample.FullPath);
+
+            context.Information("Executing sample {0}...", sampleName);
+            var exitCode = context.StartProcess(
+                linqpadExe,
+                $"-compileonly -lang=Program {rewrittenSample}");
+
+            if (exitCode != 0)
+            {
+                throw new CakeException($"Execution of sample {sampleName} failed");
+            }
+        }
+
+        context.Information("All samples executed successfully");
+    }
+
+    public override bool ShouldRun(BuildContext context)
+    {
+        return context.IsRunningOnWindows();
+    }
+
+    private static string RewriteLinqpadScriptToUseLocalAssemblies(string directory, string filePath)
+    {
+        var text = File.ReadAllText(filePath);
+
+        var openTag = "<Query Kind=\"Program\">";
+        var openTagIndex = text.IndexOf(openTag);
+        var closeTag = "</Query>";
+        var closeTagIndex = text.IndexOf(closeTag);
+
+        if (openTagIndex == -1 || closeTagIndex == -1)
+        {
+            throw new InvalidOperationException();
+        }
+
+        var endOfMetadata = closeTagIndex + closeTag.Length;
+
+        // write to temp file on disk
+        var tempFilePath = System.IO.Path.GetTempFileName();
+
+        using (var stream = File.OpenWrite(tempFilePath))
+        using (var writer = new StreamWriter(stream))
+        {
+            // reference all known assemblies
+            writer.WriteLine("ref {0}\\System.Reactive.Core.dll;", directory);
+            writer.WriteLine("ref {0}\\System.Reactive.Interfaces.dll;", directory);
+            writer.WriteLine("ref {0}\\System.Reactive.Linq.dll;", directory);
+            writer.WriteLine("ref {0}\\Octokit.dll;", directory);
+            writer.WriteLine("ref {0}\\Octokit.Reactive.dll;", directory);
+            writer.WriteLine("ref C:\\Program Files (x86)\\Reference Assemblies\\Microsoft\\Framework\\.NETFramework\\v4.5\\System.Net.Http.dll;");
+            writer.WriteLine();
+
+            var xmlText = text.Substring(openTagIndex, endOfMetadata);
+            var rest = text.Substring(endOfMetadata);
+
+            var doc = XDocument.Parse(xmlText);
+
+            // add namespaces specified in xml
+            var namespaces = doc.Descendants()
+                .Where(x => x.Name == "Namespace")
+                .Select(x => x.Value.ToString());
+
+            foreach (var @namespace in namespaces)
+            {
+                writer.WriteLine("using {0};", @namespace);
+            }
+
+            writer.WriteLine();
+            writer.WriteLine(rest);
+
+            writer.Flush();
+        }
+
+        return tempFilePath;
+    }
+}