mirror of https://github.com/sbt/sbt.git
44 lines
1.7 KiB
Scala
44 lines
1.7 KiB
Scala
/* sbt -- Simple Build Tool
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* Copyright 2009, 2010 Mikko Peltonen, Stuart Roebuck, Mark Harrah
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*/
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package sbt
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import CommandSupport.FailureWall
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import annotation.tailrec
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trait Watched
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{
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/** A `PathFinder` that determines the files watched when an action is run with a preceeding ~ when this is the current
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* project. This project does not need to include the watched paths for projects that this project depends on.*/
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def watchPaths: PathFinder = Path.emptyPathFinder
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def terminateWatch(key: Int): Boolean = Watched.isEnter(key)
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}
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object Watched
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{
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val PollDelaySeconds = 1
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def isEnter(key: Int): Boolean = key == 10 || key == 13
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def watched(p: Project): Seq[Watched] = MultiProject.topologicalSort(p).collect { case w: Watched => w }
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def sourcePaths(p: Project): PathFinder = (Path.emptyPathFinder /: watched(p))(_ +++ _.watchPaths)
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def executeContinuously(project: Project with Watched, s: State, in: Input): State =
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{
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@tailrec def shouldTerminate: Boolean = (System.in.available > 0) && (project.terminateWatch(System.in.read()) || shouldTerminate)
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val sourcesFinder = sourcePaths(project)
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val watchState = s get ContinuousState getOrElse WatchState.empty
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if(watchState.count > 0)
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System.out.println(watchState.count + ". Waiting for source changes... (press enter to interrupt)")
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val (triggered, newWatchState) = SourceModificationWatch.watch(sourcesFinder, PollDelaySeconds, watchState)(shouldTerminate)
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if(triggered)
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(in.arguments :: FailureWall :: in.line :: s).put(ContinuousState, newWatchState)
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else
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{
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while (System.in.available() > 0) System.in.read()
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s.put(ContinuousState, WatchState.empty)
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}
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}
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val ContinuousState = AttributeKey[WatchState]("watch state")
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} |