Scala home directory for creating Scala project in IntelliJ IDEA - scala

Question

I'm new to both Scala and IntelliJ. I've installed Scala plugin for IntelliJ
I've installed Scala in my Ubuntu system with
sudo apt-get install scala
When I try to create new scala project, I'm required to do Scala Settings.
But the problem is I couldn't find the the home directory for my Scala installation.
What is the home directory for Scala in my ubuntu?
Thanks.

Answer 1

The plugin wants to know where the Scala libraries are installed (as it would want to know where the Java SDK is located for a Java module). Note that for different Scala projects you might use different versions of Scala: 2.9.0 or 2.10.2, etc. The dialog offers to download them or you can go to the Scala site and download them yourself. For example, I downloaded scala-2.10.2.tgz from http://www.scala-lang.org/download/ and expanded it in /home/glenn/Applications/Scala/ to
/home/glenn/Applications/Scala/scala-2.10.2/. This latter path is what goes in the "Set Scala Home" field in the dialog.
Note that in my case this is preferable to using the apt-get installation of Scala because the API changes so much that I usually end up with different versions of Scala for different projects that I experiment with.
Follow the version links at http://www.scala-lang.org/download/all.html to the version page with the download for the docs.
Note that for me, IDEA wanted the docs to be in the "doc/scala-devel-docs" directory, whereas the downloaded docs decompressed to "scala-docs-2.10.2". I made a link so that IDEA can find them. My 2.10.2 directory looks like this, now.
scala-2.10.2
├── bin
├── doc
│   ├── scala-devel-docs -> scala-docs-2.10.2
│   ├── scaladoc
│   │   └── lib
│   ├── scala-docs-2.10.2
│   │   └── api
│   └── tools
│   ├── css
│   └── images
├── examples
│   ├── actors
│   ├── monads
│   ├── parsing
│   │   └── lambda
│   ├── tcpoly
│   │   └── monads
│   └── xml
│   └── phonebook
├── lib
├── man
│   └── man1
├── misc
│   └── scala-devel
│   └── plugins
└── src

Answer 2

Run
$ dpkg -L scala
It will show a list of files in that package. Search for scalac:
$ dpkg -L scala | grep scalac
It will be something like /usr/share/scala/bin/scalac. Strip off /bin/scalac part and you will get Scala home: /usr/share/scala.
Update
It seems that there is no dedicated Scala home in Ubuntu. scala-library package files are installed simply to /usr/share/java. I guess then that the most simple way to get proper Scala home is to download a tarball from http://scala-lang.org/, extract it somewhere and use extracted directory as Scala home.