Why does sbt create layers of projects and src in IDEA? - scala

Question

I am new to SBT and trying to build a project. My Build.scala looks like
lazy val ec = project.in(file("."))
.settings(commonSettings: _*)
.settings(name := "ec")
.aggregate(ahka, currentLogProcessor, main)
lazy val currentLogProcessor = project.in(file("currentLogProcessor"))
.settings(commonSettings: _*)
.settings(name := "currentlogprocessor")
.settings(
libraryDependencies += "com.myorg.util" % "LP" % "0.18.0-SNAPSHOT" % "provided"
)
lazy val main = project
.settings(commonSettings: _*)
.settings(name := "main")
When SBT refreshes in IntelliJ, I see following
As you could see, even if the settings looks same for currentLogProcessor and main, the project structure is very very different.
project inside currentLogProcessor looks good but project under main is layer with project and src
What is the issue here? How can I remove the layers of project inside project?
Thanks

Answer 1

Your projects ec and main share the same folder. Remove main or ec, or change "in file" for one of them.
lazy val main = project in file("another_path") ...

Answer 2

The answer by #ka4eli is correct, but I'd like to point out few issues with the build definition that can make understanding it so much painful.
Defining top-level aggregate project
lazy val ec = project.in(file("."))
.settings(commonSettings: _*)
.settings(name := "ec")
.aggregate(ahka, currentLogProcessor, main)
You don't need it whatsoever as it's defined automatically anyway - you're just repeating what sbt does implicitly. Just remove it from the build and add build.sbt with the following:
commonSettings
Use build.sbt for a project's build definition
lazy val currentLogProcessor = project.in(file("currentLogProcessor"))
.settings(commonSettings: _*)
.settings(name := "currentlogprocessor")
.settings(
libraryDependencies += "com.myorg.util" % "LP" % "0.18.0-SNAPSHOT" % "provided"
)
By default, lazy val's name is used to call a project project macro should point to, i.e. no need for in(file("currentLogProcessor")). The same applies to the name setting - you're using all-lowercase name that may or may not be needed.
Use build.sbt under currentLogProcessor directory to have the same effect:
name := "currentlogprocessor"
commonSettings
libraryDependencies += "com.myorg.util" % "LP" % "0.18.0-SNAPSHOT" % "provided"
It's that simple.
Apply the rules to the main project.
Have fun with sbt = it's so simple that people hardly accept it and mess up build definitions on purpose to claim otherwise :)