How to compile just some files with sbt?
sbt, scala
Solution
You could define a Multi-Project Build where the files you want to compile separately are encapsulated in a project. According to the docs, the following is then possible:
At the sbt interactive prompt, type projects to list your projects and project to select a current project. When you run a task like compile, it runs on the current project. So you don't necessarily have to compile the root project, you could compile only a subproject.
Problem
I've come pretty well along with sbt, the Scala Build Tool. If you only have small problems in the code, it's easy. Now, after a major feature add, much of my code is broken and I sbt seems to be confused as to how the dependencies are. I could help it, compiling the fundamental modules first, but it does not seem to let me. It's help system is... notorious. ``` > help compile Compiles sources. ``` Yeah, well. I guessed that. What I wanted to hear was: how do I compile only - say - `src/module/A.scala`. This might not even be possible (hello again, `make`, never abandoned you!). At least I cannot find any reference on the Internet to applying `sbt compile` just to a single file. I'm using sbt from the command line prompt, not an IDE. UPDATE: It was my fault. :/ Had split a source file into multiple, but forgot to copy a `package` clause to each of the new ones. Oooops. Will keep this open for a while, since compiling just a single file (i.e. something like `sbt compile filename`) would imho not be a bad thing.