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/*
* sbt-boilerplate is distributed under the 2-Clause BSD license. See the LICENSE file in the root
* of the repository.
*
* Copyright (c) 2012 Johannes Rudolph
*/
package spray.boilerplate
import sbt._
import Keys._
object BoilerplatePlugin extends Plugin {
object Boilerplate {
val boilerplateGenerate = taskKey[Seq[File]]("Generates boilerplate from template files")
val boilerplateSource = settingKey[File]("Default directory containing boilerplate template sources.")
private def rawBoilerplateSettings: Seq[Setting[_]] = {
val inputFilter = "*.template"
Seq(
boilerplateSource := sourceDirectory.value / "boilerplate",
watchSources in Defaults.ConfigGlobal ++= ((boilerplateSource.value ** inputFilter) --- (boilerplateSource.value ** excludeFilter.value ** inputFilter)).get,
boilerplateGenerate := generateFromTemplates(streams.value, boilerplateSource.value, sourceManaged.value),
mappings in packageSrc ++= managedSources.value x (Path.relativeTo(sourceManaged.value) | Path.flat),
sourceGenerators <+= boilerplateGenerate)
}
val settings =
inConfig(Compile)(rawBoilerplateSettings) ++ inConfig(Test)(rawBoilerplateSettings)
def generateFromTemplates(streams: TaskStreams, sourceDir: File, targetDir: File): Seq[File] = {
val files = sourceDir ** "*.template"
def changeExtension(f: File): File = {
val (ext, name) = f.getName.reverse.span(_ != '.')
new File(f.getParent, name.drop(1).reverse.toString)
}
val mapping = (files x rebase(sourceDir, targetDir)).map {
case (orig, target) ⇒ (orig, changeExtension(target))
}
mapping foreach {
case (templateFile, target) ⇒
if (templateFile.lastModified > target.lastModified) {
streams.log.info("Generating '%s'" format target.getName)
val template = IO.read(templateFile)
IO.write(target, Generator.generateFromTemplate(template, 22))
} else
streams.log.debug("Template '%s' older than target. Ignoring." format templateFile.getName)
}
mapping.map(_._2)
}
}
}
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