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LessPlugin.scala
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LessPlugin.scala
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import sbt._
import Keys._
import com.untyped.sbtgraph.{Graph,Source,Descendents}
import org.mozilla.javascript.tools.shell.Global
import org.mozilla.javascript.{Context,Scriptable,ScriptableObject,Callable,JavaScriptException}
import scala.collection.JavaConverters._
object LessPlugin extends sbt.Plugin {
case class LessSource(graph: LessGraph, src: File) extends Source with Rhino {
type S = LessSource
type G = LessGraph
val parents: List[LessSource] = Nil
def isTemplated: Boolean =
src.getPath.contains(".template")
val compileFunction: String =
"""
|function loadFile(originalHref, currentFileInfo, callback, env, modifyVars) {
| var href = less.modules.path.join(currentFileInfo.rootpath, originalHref);
| var newFileInfo = {rootpath: less.modules.path.dirname(href)};
|
| try {
| var data = readFile(href);
| callback(null, data, href, newFileInfo);
| } catch (e) {
| callback(e, null, href);
| }
|}
|
|less.Parser.fileLoader = loadFile;
|
|function compile(code, rootDir) {
| var options = {rootpath: rootDir, paths: [rootDir]};
| var css = null;
|
| new less.Parser(options).parse(code, function (e, root) {
| if (e) { throw e; }
| css = root.toCSS({ compress: false })
| });
|
| return css;
|}
""".trim.stripMargin
def lessScope(ctx: Context): Scriptable = {
val global = new Global()
global.init(ctx)
val scope = ctx.initStandardObjects(global)
val lessScript = "less-rhino-1.7.0.js"
val lessReader = new java.io.InputStreamReader(getClass.getResourceAsStream(lessScript))
ctx.evaluateReader(scope, lessReader, lessScript, 1, null)
ctx.evaluateString(scope, compileFunction, "<sbt>", 1, null)
scope
}
def compile: Option[File] = {
des.map { des =>
graph.log.info(s"Compiling ${graph.pluginName} source $des")
withContext { ctx =>
val scope = lessScope(ctx)
val lessCompiler = scope.get("compile", scope).asInstanceOf[Callable]
val args = Array[AnyRef](IO.read(src), src.getParent)
val output = withError { lessCompiler.call(ctx, scope, scope, args) }.toString
IO.write(des, output)
des
}
}
}
def withError[T](block: => T): T = {
try {
block
} catch {
case exception: JavaScriptException =>
val error = exception.getValue.asInstanceOf[Scriptable]
val line = ScriptableObject.getProperty(error, "line" ).asInstanceOf[Double].intValue
val column = ScriptableObject.getProperty(error, "column" ).asInstanceOf[Double].intValue
val message = ScriptableObject.getProperty(error, "message").toString
sys.error("%s error: %s [%s,%s]: %s".format(graph.pluginName, src.getName, line, column, message))
}
}
}
case class LessGraph(log: Logger, sourceDirs: Seq[File], targetDir: File) extends Graph {
type S = LessSource
val pluginName = "sbt-less"
val templateProperties = null
val downloadDir = null
def createSource(src: File): LessSource =
LessSource(this, src.getCanonicalFile)
def srcFilenameToDesFilename(filename: String) =
filename.stripSuffix("less") + "css"
}
object LessKeys {
val less = taskKey[Seq[File]]("Compile Less templates")
val lessGraph = taskKey[LessGraph]("Collection of Less templates")
}
import LessKeys._
def lessGraphTask = Def.task {
val graph = LessGraph(
log = streams.value.log,
sourceDirs = (sourceDirectories in less).value,
targetDir = (resourceManaged in less).value)
(unmanagedSources in less).value.foreach(graph += _)
graph
}
def unmanagedSourcesTask = Def.task {
val include = includeFilter in less value
val exclude = excludeFilter in less value
(sourceDirectories in less).value.foldLeft(Seq[File]()) {
(acc, sourceDir) => acc ++ Descendents(sourceDir, include, exclude).get
}
}
def watchSourcesTask = Def.task {
val graph = (lessGraph in less).value
graph.sources.map(_.src): Seq[File]
}
def compileTask = Def.task {
val sources = (unmanagedSources in less).value
val graph = (lessGraph in less).value
graph.compileAll(sources)
}
def cleanTask = Def.task {
val graph = (lessGraph in less).value
graph.sources.foreach(_.clean())
}
def lessSettingsIn(conf: Configuration): Seq[Setting[_]] = {
inConfig(conf)(Seq(
includeFilter in less := "*.less",
excludeFilter in less := (".*" - ".") || "_*" || HiddenFileFilter,
sourceDirectory in less <<= (sourceDirectory in conf),
sourceDirectories in less <<= (sourceDirectory in (conf, less)) { Seq(_) },
unmanagedSources in less <<= unmanagedSourcesTask,
resourceManaged in less <<= resourceManaged in conf,
sources in less <<= watchSourcesTask,
watchSources in less <<= watchSourcesTask,
clean in less <<= cleanTask,
lessGraph <<= lessGraphTask,
less <<= compileTask
)) ++ Seq(
cleanFiles <+= resourceManaged in less in conf,
watchSources <++= watchSources in less in conf
)
}
def lessSettings: Seq[Setting[_]] =
lessSettingsIn(Compile) ++ lessSettingsIn(Test)
}