In sbt's terminology, the "base directory" is the directory containing the project. So if you created a project hello containing hello/build.sbt and hello/hw.scala as in the Hello, World example, hello is your base directory.
Source code can be placed in the project's base directory as with hello/hw.scala. However, most people don't do this for real projects; too much clutter.
sbt uses the same directory structure as Maven for source files by default (all paths are relative to the base directory):
src/ main/ resources/ <files to include in main jar here> scala/ <main Scala sources> java/ <main Java sources> test/ resources <files to include in test jar here> scala/ <test Scala sources> java/ <test Java sources>
Other directories in src/ will be ignored. Additionally, all hidden directories will be ignored.
sbt build definition files¶
You've already seen build.sbt in the project's base directory. Other sbt files appear in a project subdirectory.
project can contain .scala files, which are combined with .sbt files to form the complete build definition. See .scala build definitions for more.
build.sbt project/ Build.scala
You may see .sbt files inside project/ but they are not equivalent to .sbt files in the project's base directory. Explaining this will come later, since you'll need some background information first.
Generated files (compiled classes, packaged jars, managed files, caches, and documentation) will be written to the target directory by default.
Configuring version control¶
Your .gitignore (or equivalent for other version control systems) should contain:
Note that this deliberately has a trailing / (to match only directories) and it deliberately has no leading / (to match project/target/ in addition to plain target/).