use xsltproc to generate documentation on linux

.travis.yml

@@ -3,6 +3,7 @@ solution: csharp/SparkCLR.sln
 sudo: required
 dist: trusty
 before_install:
+  - sudo apt-get install xsltproc
   - nuget install NUnit.Runners -Version 3.0.0 -OutputDirectory testrunner
   # install maven 3.3.3
   - wget http://archive.apache.org/dist/maven/maven-3/3.3.3/binaries/apache-maven-3.3.3-bin.tar.gz

csharp/Adapter/Microsoft.Spark.CSharp/Adapter.csproj

@@ -159,6 +159,10 @@
     <XslTransformation
       XslInputPath="..\documentation\DocFormatter.xsl"
       XmlInputPaths="..\documentation\Microsoft.Spark.CSharp.Adapter.Doc.XML"
-      OutputPaths="..\documentation\SparkCLR_API_Documentation.md" />
+      OutputPaths="..\documentation\SparkCLR_API_Documentation.md"
+      Condition="'$(OS)' == 'Windows_NT'" />
+    <Exec 
+      Command="xsltproc -o ../documentation/SparkCLR_API_Documentation.md ../documentation/DocFormatter.xsl ../documentation/Microsoft.Spark.CSharp.Adapter.Doc.XML"
+      Condition="'$(OS)' != 'Windows_NT'" />
   </Target>
 </Project>

linux-instructions.md

@@ -6,6 +6,7 @@
 * Maven 3.3.3 or above.
 * Mono 4.2 stable or above. The download and installation instructions for Mono are available in [http://www.mono-project.com/download/#download-lin](http://www.mono-project.com/download/#download-lin).
 * NuGet.
+* XSLTPROC
 
 The following environment variables should be set properly: