Import multiple packages in Scala REPL

Question

In Scala, I frequently have to import multiple packages worth of implicits and other utilities, particularly on the REPL:

import scala.collection.JavaConversions._
import scala.collection.{mutable => mut}
import com.myapp.db._
import com.orm._
val con = connectDb(...)
...

I understand there's no way to import multiple packages in Scala (though package object scopes can help a bit), but what about from the REPL? Is there any way to do this from the REPL without lots of copying and pasting? I also tried using :load, but things imported/created there don't get introduced into the REPL's scope either. I noticed that the :power command does import things into scope.

Update: :load actually does work.

What do you mean "but things imported/created there don't get introduced into the REPL's scope either" when using :load? Seems to work fine for me for imports and objects... — huynhjl
You're right - I mistakenly tried mut.<TAB> and thought the lack of completions meant nothing was being imported. — Yang

Kipton Barros Kipton Barros · Accepted Answer · 2011-08-05T23:44:56

I'm not sure of a general solution, but in SBT it's possible to configure the project so that the console (REPL) runs some initial commands upon launching. Here's an excerpt from an example build.sbt file,

// set the initial commands when entering 'console' only
initialCommands in console := "import myproject._"

Edit: Another reference is the Scalala project. They have a Scala program that launches an embedded REPL and fills in the necessary imports. For usage, see their quick-start guide.

Import multiple packages in Scala REPL

1 Answers