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Fix #2299: Fix import into IDEs #2316

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merged 2 commits into from
Apr 27, 2017
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Fix #2299: Fix import into IDEs #2316

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56cc93f
Fix importing dotty-interfaces in Eclipse
smarter Apr 27, 2017
8cb4d43
Fix #2299: Fix import into IDEs
smarter Apr 27, 2017
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Fix #2299: Fix import into IDEs 
Both IntelliJ and Eclipse fail horribly when trying to import a project using `unmanagedSourceDirectories` containing files (and not directories), but this is necessary for our build since we only want to compile a subset of the backend folder. We workaround this by linking (or copying on OS when symbolic links do not work) the files we want to compile in sbt `managedSources`. Make sure to run `sbt compile` at least once before running `sbt eclipse` or importing the project in IntelliJ.
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@smarter
smarter committed Apr 27, 2017
commit 8cb4d43279426ab048a65e8e605ed80872f50b37
33 changes: 29 additions & 4 deletions project/Build.scala
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Expand Up @@ -3,6 +3,7 @@ import sbt._
import complete.DefaultParsers._
import java.io.{ RandomAccessFile, File }
import java.nio.channels.FileLock
import java.nio.file.Files
import scala.reflect.io.Path
import sbtassembly.AssemblyKeys.assembly

Expand Down Expand Up @@ -257,17 +258,41 @@ object Build {
// We do not compile the whole submodule, only the part of the Scala 2.11 GenBCode backend
// that we reuse for dotty.
// See http://dotty.epfl.ch/docs/contributing/backend.html for more information.
unmanagedSourceDirectories in Compile ++= {
val backendDir = baseDirectory.value / ".." / "scala-backend" / "src" / "compiler" / "scala" / "tools" / "nsc" / "backend"
//
// NOTE: We link (or copy if symbolic links are not supported) these sources in
// the current project using `sourceGenerators` instead of simply
// referencing them using `unmanagedSourceDirectories` because the latter
// breaks some IDEs.
sourceGenerators in Compile += Def.task {
val outputDir = (sourceManaged in Compile).value

val submoduleCompilerDir = baseDirectory.value / ".." / "scala-backend" / "src" / "compiler"
val backendDir = submoduleCompilerDir / "scala" / "tools" / "nsc" / "backend"
val allScalaFiles = GlobFilter("*.scala")

// NOTE: Keep these exclusions synchronized with the ones in the tests (CompilationTests.scala)
((backendDir *
val files = ((backendDir *
(allScalaFiles - "JavaPlatform.scala" - "Platform.scala" - "ScalaPrimitives.scala")) +++
(backendDir / "jvm") *
(allScalaFiles - "BCodeICodeCommon.scala" - "GenASM.scala" - "GenBCode.scala" - "ScalacBackendInterface.scala")
).get
},

val pairs = files.pair(sbt.Path.rebase(submoduleCompilerDir, outputDir))

try {
pairs.foreach { case (src, dst) =>
sbt.IO.createDirectory(dst.getParentFile)
if (!dst.exists)
Files.createSymbolicLink(/*link = */ dst.toPath, /*existing = */src.toPath)
}
} catch {
case e: UnsupportedOperationException =>
// If the OS doesn't support symbolic links, copy the directory instead.
sbt.IO.copy(pairs, overwrite = true, preserveLastModified = true)
}

pairs.map(_._2)
}.taskValue,

// Used by the backend
libraryDependencies += "org.scala-lang.modules" % "scala-asm" % "5.1.0-scala-2",
Expand Down