Collect all the module trees in the plugin and query that from direct…

…ive (#10)

One downside is that it now requires to populate `paradoxDependenciesModules` on the use side. But on the other hand, the access to the dependency tree is now done without touching the state directly.

Fixes #9

README.md

@@ -9,10 +9,14 @@ addSbtPlugin("com.lightbend.paradox" % "sbt-paradox-dependencies" % <latest>)
 ```
 
 Use the directive in a Paradox markdown file and specify the sbt project id.
+
 ```
 @@dependencies { projectId="core" }
 ```
 
+Any project from the build root project aggregates can be specified. If the project is not among the aggregates, then it needs
+to be added to the `paradoxDependenciesProjects` setting value.
+
 ## License
 
 The license is Apache 2.0, see LICENSE.

src/main/scala/com/lightbend/paradox/dependencies/ParadoxDependenciesPlugin.scala

@@ -33,16 +33,31 @@ object ParadoxDependenciesPlugin extends AutoPlugin {
 
   override def projectSettings: Seq[Setting[_]] = dependenciesSettings(Compile)
 
-  def dependenciesGlobalSettings: Seq[Setting[_]] = Seq(
+  def dependenciesZeroSettings: Seq[Setting[_]] = Seq(
+    paradoxDependenciesModuleTrees := Def.taskDyn {
+      val projectsToFilter = paradoxDependenciesProjects.?.value
+        .map(inProjects)
+        .getOrElse {
+          inAggregates(LocalRootProject, includeRoot = true)
+        }
+
+      val filter: ScopeFilter = ScopeFilter(projectsToFilter, inConfigurations(Compile))
+
+      val projectIdWithTree = Def.task {
+        (thisProject.value.id, ModuleTree(DependencyGraphKeys.moduleGraphSbt.value))
+      }
+
+      projectIdWithTree.all(filter).map(_.toMap)
+    }.value,
     paradoxDirectives ++= Def.taskDyn {
       Def.task {
-        val s = state.value
+        val trees = paradoxDependenciesModuleTrees.value
         Seq(
           { _: Writer.Context ⇒
             new DependenciesDirective(projectId => {
-              Project.runTask(LocalProject(projectId) / Compile / DependencyGraphKeys.moduleGraphSbt, s) match {
-                case Some((_, Value(deps))) => ModuleTree(deps)
-                case _ => throw new Error(s"Could not retrieve dependency information for projectId [$projectId]")
+              trees.get(projectId) match {
+                case Some(deps) => deps
+                case _ => throw new Error(s"Could not retrieve dependency information for project [$projectId]")
               }
             })
           }
@@ -52,7 +67,7 @@ object ParadoxDependenciesPlugin extends AutoPlugin {
   )
 
   def dependenciesSettings(config: Configuration): Seq[Setting[_]] =
-    dependenciesGlobalSettings ++ inConfig(config)(
+    dependenciesZeroSettings ++ inConfig(config)(
       Seq(
         // scoped settings here
       ))

src/main/scala/com/lightbend/paradox/dependencies/ParadoxDependenciesPluginKeys.scala

@@ -16,4 +16,11 @@
 
 package com.lightbend.paradox.dependencies
 
-trait ParadoxDependenciesPluginKeys {}
+import net.virtualvoid.sbt.graph.ModuleTree
+
+import sbt._
+
+trait ParadoxDependenciesPluginKeys {
+  val paradoxDependenciesProjects    = settingKey[Seq[ProjectReference]]("Projects to get the dependency information for")
+  val paradoxDependenciesModuleTrees = taskKey[Map[String, ModuleTree]]("Retrieved module trees")
+}

src/sbt-test/dependencies/multi-module/build.sbt

@@ -1,8 +1,3 @@
-enablePlugins(ParadoxPlugin)
-paradoxTheme := None
-
-libraryDependencies += "com.typesafe.akka" %% "akka-actor" % "2.5.17"
-
 lazy val projectA = project
   .settings(
     libraryDependencies += "com.typesafe.akka" %% "akka-actor" % "2.5.17"
@@ -16,7 +11,9 @@ lazy val projectB = Project("projectBee", file("bee"))
     libraryDependencies += "org.slf4j" % "slf4j-api" % "1.7.25"
   )
 
-lazy val multiModule = project
-  .aggregate(
-    projectB
+lazy val multiModule = (project in file("."))
+  .settings(
+    paradoxTheme := None
   )
+  .enablePlugins(ParadoxPlugin)
+  .aggregate(projectB)

src/sbt-test/dependencies/multi-module/docs/src/main/paradox/_template/page.st

@@ -0,0 +1 @@
+$page.content$

src/sbt-test/dependencies/multi-module/docs/src/main/paradox/index.md

@@ -0,0 +1,3 @@
+This module has the following dependencies:
+
+@@dependencies { module="module1" }

src/sbt-test/dependencies/multi-module/test

@@ -1,3 +1,9 @@
+# expect to fail, because projectA is not part of the root aggregate
+-> paradox
+
+> set paradoxDependenciesProjects := Seq(projectA, projectB)
+
+# now plugin knows about all projects and is able to generate dependency info for all
 > paradox
 
-$ must-mirror target/paradox/site/main/index.html expected/index.html
+$ must-mirror target/paradox/site/main/index.html expected/index.html