Created
August 12, 2014 20:28
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Using -Xmacro-settings from SBT
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| scalaVersion in ThisBuild := "2.11.2" | |
| lazy val macros = project settings( | |
| libraryDependencies += "org.scala-lang" % "scala-reflect" % scalaVersion.value, | |
| scalacOptions += "-language:experimental.macros") | |
| lazy val main = project dependsOn(macros) settings( | |
| scalacOptions += "-Xmacro-settings:foo=bar,bippy") |
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| $ tree | |
| . | |
| |-- build.sbt | |
| |-- macros | |
| | `-- macros.scala | |
| |-- main | |
| | `-- test.scala | |
| `-- project | |
| `-- build.properties | |
| 3 directories, 4 files | |
| $ sbt 'main/run' | |
| [info] Loading global plugins from /home/gourlaysama/.sbt/0.13/plugins | |
| [info] Loading project definition from /tmp/toto/project | |
| [info] Updating {file:/tmp/toto/project/}toto-build... | |
| [info] Resolving org.fusesource.jansi#jansi;1.4 ... | |
| [info] Done updating. | |
| [info] Set current project to toto (in build file:/tmp/toto/) | |
| [info] Updating {file:/tmp/toto/}macros... | |
| [info] Resolving jline#jline;2.12 ... | |
| [info] Done updating. | |
| [info] Updating {file:/tmp/toto/}main... | |
| [info] Resolving jline#jline;2.12 ... | |
| [info] Done updating. | |
| [info] Compiling 1 Scala source to /tmp/toto/macros/target/scala-2.11/classes... | |
| [warn] there was one deprecation warning; re-run with -deprecation for details | |
| [warn] one warning found | |
| [info] Compiling 1 Scala source to /tmp/toto/main/target/scala-2.11/classes... | |
| [info] Running Test | |
| Hello World!, Macro Property: bar | |
| [success] Total time: 9 s, completed Aug 12, 2014 10:27:37 PM |
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| import scala.language.experimental.macros | |
| import scala.reflect.macros.Context | |
| object Macros { | |
| def impl(c: Context) = { | |
| import c.universe._ | |
| val s = c.settings.find(_.startsWith("foo=")).map(_.substring(4)).orNull | |
| val prop = c.Expr[String](Literal(Constant(s))) | |
| reify { | |
| println("Hello World!, Macro Property: "+prop.splice) | |
| } | |
| } | |
| def hello: Unit = macro impl | |
| } |
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| object Test extends App { | |
| Macros.hello | |
| } |
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