CODEWITHSUNDEEP
sbt
matanox
matanox

Reputation: 13716

How do you compose sbt projects into a single build?

A question about composing sbt projects: I forked a library project (https://github.com/allenai/pipeline) and wish to hack on it vis-a-vis my project that uses it. If I put them in the same multi-project build ― really my preferred option over publishing locally and consuming ― sbt will not read the project dir of the nested fork (where .scala files and plugin definitions originally reside). E.g. I try, in build.sbt:

lazy val pipeline = (project in file("pipeline"))

lazy val githubCruncher = (project in file("."))
  .dependsOn(pipeline)

And I get errors indicating directory pipeline/project is being ignored; the build.sbt itself of the nested project is being read, but sbt does not find what is defined alongside to it in its sibling project directory (and hence fails to load build definition).

So, must I squash the two projects into a single build.sbt or can I somehow elegantly compose the two without that? I am asking because this has also been a problem on other projects I work on where I ended up squashing each and every build definition minutia into one big monolith ― even though I'd prefer distributing some of the sub-projects as independent projects aside my own dev configuration.

Upvotes: 1

Views: 71

Answers (1)

matanox
matanox

Reputation: 13716

According to my experience looks like everything inside the project directory of a project being pulled into a multi-project build ― needs to move to project under the root of the multi-project build, whereas the build.sbt of the pulled-in project does not have to be squashed ― a reference to it from from the top level build.sbt will work (unless that reference is followed by definitions for it right there in the top level build.sbt).

Sbt plugins coming from the pulled-in project then become applied to the unified multi-project build, and need to be disabled with disablePlugins for other sub-projects, if or where appropriate or desireable.

Upvotes: 1

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