What is an "Attributed"

[Maxime Lévesque]

I wanted do add this to a build definition :

   fullClasspath in Runtime <+= baseDirectory.map(bd => bd / "... some file..")

didn't compile, I googled a bit and found I had to do this :

   fullClasspath in Runtime <+= baseDirectory.map(bd => Attributed.blank(bd / "... some file.."))

I'm curious, what is the meaning of  Attributed and blank in this context ?

Thanks

ML

[Jason Zaugg]

Hi Maxime,

Here's the source for Attributed: https://github.com/harrah/xsbt/blob/0.12/util/collection/Attributes.scala

Attributed[T] is a single value of type T, accompanied by a map of metadata. For example, entries in the classpath that correspond to a libraryDependency have the ModuleID stored as metadata.

Let's try it out in console project [1] :

> analytics-utils/console-project

[info] Starting scala interpreter...

scala> val fc = evalTask(fullClasspath in Compile in analyticsUtils, currentState)

warning: there were 1 deprecation warnings; re-run with -deprecation for details

fc: sbt.Keys.Classpath = List(Attributed(C:\code\analytics\analytics-utils\target\classes), Attributed(C:\Users\zgg\.sbt\boot\scala-2.9.1\lib\scala-library.jar), Attributed(C:\Users\zgg\.ivy2\cache\org.scalaz\scalaz-core_2.9.0-1\jars\scalaz-core_2.9.0-1-6.0.1.jar), Attributed(C:\Users\zgg\.ivy2\cache\com.google.guava\guava\jars\guava-r03-EFG.jar), Attributed(C:\Users\zgg\.ivy2\cache\fastutil\fastutil\jars\fastutil-5.1.5.jar), Attributed(C:\Users\zgg\.ivy2\cache\joda-time\joda-time\jars\joda-time-1.6.jar), Attributed(C:\Users\zgg\.ivy2\cache\ch.qos.logback\logback-classic\jars\logback-classic-1.0.0.jar), Attributed(C:\Users\zgg\.ivy2\cache\ch.qos.logback\logback-core\jars\logback-core-1.0.0.jar), Attributed(C:\Users\zgg\.ivy2\cache\org.slf4j\slf4j-api\jars\slf4j-api-1.6.4.jar), Attribute...

scala> fc.map(cp => (cp.data, cp.metadata.keys)).take(5).mkString("\n")

res6: String = 

(C:\code\analytics\analytics-utils\target\classes,Set(analysis))

(C:\Users\zgg\.sbt\boot\scala-2.9.1\lib\scala-library.jar,Set(artifact, module-id, configuration))

(C:\Users\zgg\.ivy2\cache\org.scalaz\scalaz-core_2.9.0-1\jars\scalaz-core_2.9.0-1-6.0.1.jar,Set(artifact, module-id, configuration))

(C:\Users\zgg\.ivy2\cache\com.google.guava\guava\jars\guava-r03-EFG.jar,Set(artifact, module-id, configuration))

(C:\Users\zgg\.ivy2\cache\fastutil\fastutil\jars\fastutil-5.1.5.jar,Set(artifact, module-id, configuration))

scala> fc.map(cp => (cp.data, cp.get(Keys.moduleID.key))).take(5).mkString("\n")

res4: String = 

(C:\code\analytics\analytics-utils\target\classes,None)

(C:\Users\zgg\.sbt\boot\scala-2.9.1\lib\scala-library.jar,Some(org.scala-lang:scala-library:2.9.1))

(C:\Users\zgg\.ivy2\cache\org.scalaz\scalaz-core_2.9.0-1\jars\scalaz-core_2.9.0-1-6.0.1.jar,Some(org.scalaz:scalaz-core_2.9.0-1:6.0.1))

(C:\Users\zgg\.ivy2\cache\com.google.guava\guava\jars\guava-r03-EFG.jar,Some(com.google.guava:guava:r03-EFG))

(C:\Users\zgg\.ivy2\cache\fastutil\fastutil\jars\fastutil-5.1.5.jar,Some(fastutil:fastutil:5.1.5))

[1] https://github.com/harrah/xsbt/wiki/Console-Project

[Maxime Lévesque]

Thanks for your explanation, one more dot connected.

2012/1/25 Jason Zaugg <jza...@gmail.com>

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