read-eval-print-loop

New in Scala 2.9.1 is the -Yrepl-sync option, which prevents each REPL line from being run in a new thread: scala -Yrepl-sync When I run console from sbt, how do I have it pass this in? Short answer: set scalacOptions in (Compile, console) += "-Yrepl-sync" How to discover this: ~/code/scratch/20110930 sbt [info] Loading global plugins from /Users/jason/.sbt11/plugins [info] Set current project to default-9c7c16 (in build file:/Users/jason/code/scratch/20110930/) > inspect console [info] Task: Unit [info] Description: [info] Starts the Scala interpreter with the project classes on the classpath

I am not meaning cleaning up the text output of REPL; I mean cleaning up all evaluated results in REPL. During developing, repeatedly C-c C-q and C-c M-j is low efficiency. UPDATE There may be some bad debug behaviour of mine. I am not sure how other people develop progs with CIDER, but I really need the functionality mentioned above. I guess other developers also encounter same problems as mine. For example, at the top of a clojure prog unit, I use declare to declare a function foo , which is used by another function bar , and foo is implemented after bar . Then, I C-c C-k , etc, and the prog

-Hi. I'd like to embed Scala REPL with initialized environment into my app. I've looked at IMain class and it seems I could do it via instance of it. The instance is created and then stored into intp public var in process() of ILoop . How can I bind some names and/or add some imports before process() (e.g. before REPL)? Following code fails on line 3 because intp is not yet created (=> NPE): val x = 3 val interp = new ILoop interp.bind("x", x) // -> interp.intp.bind("x", x) val settings = new Settings settings.usejavacp.value = true interp.process(settings) Thank you-. UPDATE: Overriding

Please give a code example of how to create an embedded Scala REPL interpreter programmatically, that works in Scala 2.10. (I added this Q&A after spending hours combing various code scraps to get a working interpreter) Example Repl.scala : import scala.tools.nsc.interpreter._ import scala.tools.nsc.Settings object Repl extends App { def repl = new ILoop { override def loop(): Unit = { intp.bind("e", "Double", 2.71828) super.loop() } } val settings = new Settings settings.Yreplsync.value = true //use when launching normally outside SBT settings.usejavacp.value = true //an alternative to

I've been using Clojure for a little while and want to create some projects that are bigger and more complicated than toys. I've been using Java for the past few years and have become accustomed to what IDEs do for me -- compile lots of classes, package them up in jars, create batch files for users to start them with. When I look at examples of development in Clojure they seem to be along the lines of load files into the REPL, see how they work, edit the file, reload, repeat. Nary a class or jar being generated anywhere. In Stuart Halloway's terrific "Programming Clojure" I couldn't find a

I'd like to disable truncation of string values in the Scala REPL. The following thread suggested typing settings.maxPrintString = 0 : How to force interpreter show complete stack trace? Unfortunately, this doesn't seem to work with Scala 2.9: Welcome to Scala version 2.9.1.final (Java HotSpot(TM) 64-Bit Server VM, Java 1.6.0_29). Type in expressions to have them evaluated. Type :help for more information. scala> settings.maxPrintString = 0 <console>:10: error: not found: value settings val $ires0 = settings.maxPrintString ^ <console>:7: error: not found: value settings settings.maxPrintString