Add sbt-modules plugin to simplify build

[alejandrohdezma]

I came up with an idea of creating an SBT plugin to help us simplify a very common pattern in Scala projects:

• The different modules of the project live inside modules folder.
• Only those projects are published.
• Usually, there are other projects (documentation, microsite...) that depend on all the "modules".

For this, we will usually need to add .in(file("modules/my-module")) to every project, skip in publish := true to others and create a list val allProject = List(projectA, projectB...) that aggregates all the modules.

This pattern is utterly simplified with sbt-modules.

Here is an example of what is achieved:

- skip in publish := true
- 
lazy val docs = project
-  .settings(skip in publish := true)
-  .dependsOn(allProjects: _*)
+  .dependsOn(allModules: _*)
  .in(file("docs"))

+ lazy val `my-library-core` = module
- lazy val core = project
-   .in(file("modules/core"))
-   .settings(name := "my-library-core")

+ lazy val `my-library-plugin` = module 
- lazy val plugin = project
-   .in(file("modules/plugin"))
-   .settings(name := "my-library-plugin")
-   .dependsOn(core)
+   .dependsOn(`my-library-core`)
-
- lazy val allProjects: Seq[ClasspathDep[ProjectReference]] = Seq(
-   core,
-   plugin
- )

Please let me know what do you think about this 😸

[codecov]

Codecov Report

Merging #191 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #191   +/-   ##
=======================================
  Coverage   98.71%   98.71%           
=======================================
  Files          11       11           
  Lines          78       78           
  Branches        1        1           
=======================================
  Hits           77       77           
  Misses          1        1           

Impacted Files	Coverage Δ
...-cats/src/main/scala/memeid4s/cats/instances.scala	100.00% <ø> (ø)
...d4s-cats/src/main/scala/memeid4s/cats/syntax.scala	100.00% <ø> (ø)
...bie/src/main/scala/memeid4s/doobie/instances.scala	100.00% <ø> (ø)
...p4s/src/main/scala/memeid4s/http4s/instances.scala	100.00% <ø> (ø)
...teral/src/main/scala/memeid4s/literal/Macros.scala	66.66% <ø> (ø)
...cala/memeid4s/scalacheck/arbitrary/instances.scala	100.00% <ø> (ø)
...odules/memeid4s/src/main/scala/memeid4s/UUID.scala	100.00% <ø> (ø)
...4s/src/main/scala/memeid4s/digest/Digestible.scala	100.00% <ø> (ø)
...s/memeid4s/src/main/scala/memeid4s/node/Node.scala	100.00% <ø> (ø)
.../memeid4s/src/main/scala/memeid4s/time/Posix.scala	100.00% <ø> (ø)
... and 1 more

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[juanpedromoreno]

+19 -42, I buy it! 🙂