{"id":716,"date":"2011-11-02T11:36:00","date_gmt":"2011-11-02T11:36:00","guid":{"rendered":"http:\/\/www.javacodegeeks.com\/2012\/10\/scala-tutorial-sbt-scalabha-packages-build-systems.html"},"modified":"2012-10-21T20:44:41","modified_gmt":"2012-10-21T20:44:41","slug":"scala-tutorial-sbt-scalabha-packages","status":"publish","type":"post","link":"https:\/\/www.javacodegeeks.com\/2011\/11\/scala-tutorial-sbt-scalabha-packages.html","title":{"rendered":"Scala Tutorial – SBT, scalabha, packages, build systems"},"content":{"rendered":"
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Preface<\/h2>\n

This is part 11 of tutorials for first-time programmers getting into Scala. Other posts are on this blog, and you can get links to those and other resources on the links page of the Computational Linguistics course<\/a> I\u2019m creating these for. Additionally you can find this and other tutorial series on the JCG Java Tutorials page<\/a>.<\/p>\n

This tutorial gives an introduction to building Scala applications using SBT<\/a> (the Simple Build Tool). This will be done in the context of the Scalabha<\/a> package, which I have created for primarily for my Introduction to Computational Linguistics class<\/a>. Some supporting code is available in Scalabha for some basic natural language processing tasks; most relevant at the moment is the code that is in Scalabha that supports the part-of-speech tagging homework<\/a> for the class.<\/p>\n

The previous tutorial <\/a>showed how Scala code can be compiled with scalac<\/em> and then run with scala<\/em>. One problem we ended up with is that there were generated class files littering the working directory. Another thing we did not discuss is how a large system can be created in a modular way that organizes code and classes. For example, you might want to have code in different directories generate classes that can be used by one another. You also may want want to incorporate classes from other libraries into your own code. The solutions we\u2019ll discuss to address these needs and more are build systems and packages.<\/p>\n

Note<\/em>: The tutorial assumes you are using some version of Unix. If you are on Windows, you should consider using Cygwin, or you could dual boot your computer<\/a>.<\/p>\n

Note<\/em>: In this tutorial, I\u2019ll assume you are using as simple text editor to modify files. However, note that the general setup you are working with here can be used from more powerful Integrated Developer Environements (IDEs) like Eclipse, IntelliJ, and NetBeans.<\/p>\n

Setting up Scalabha<\/h2>\n

We\u2019ll work with SBT, which is perhaps the most popular build tool for Scala. The Scalabha toolkit mentioned earlier uses SBT (version 0.11.0), so we\u2019ll discuss SBT in the Scalabha context.
\nThe first thing you need to do is download Scalabha v0.1.1<\/a> Next unzip the file, change to the directory it unpacked to, and list the directory contents.<\/p>\n

$ unzip scalabha-0.1.1-src.zip\r\nArchive:  scalabha-0.1.1-src.zip\r\n<lots of output>\r\n$ cd scalabha-0.1.1\r\n$ ls\r\nCHANGES.txt README      build.sbt   project\r\nLICENSE     bin         data        src\r\n<\/pre>\n
Briefly, these contents are:<\/p>\n