Is there a Python-ealy way to run Scala scripts with dependencies?

Question

The ways I know about so far are

• Create an ant build.xml file, make compile and run tasks, and include appropriate jars in a classpath=

• Make at sbt project and include dependencies with version numbers in build.sbt

• Make a maven project and include dependencies in the xml file

• Run from the command line setting -classpath explicitly

None of these are bad, but it feels like extra work after being babied with

import json

json.loads('[1, 2]')

and having that work right off the bat, provided I have json installed. In particular tracking down appropriate versions on Mavenhub gets a little tiresome.

Though maybe I'm just being too picky ;-)

Answer 1

What you want is xsbtscript: https://github.com/paulp/xsbtscript

It allows you to create a single script file which includes both the sbt config your code requires along with the Scala code itself.

Answer 2

I think scalas from SBT is better. Either install conscript and run this command:

cs harrah/xsbt --branch v0.10.1

Or create it by hand:

java -Dsbt.main.class=sbt.ScriptMain -Dsbt.boot.directory=/home/user/.sbt/boot -jar sbt-launch.jar "$@"

And then use it like this:

#!/usr/bin/env scalas
!#

/***
scalaVersion := "2.9.0-1"

libraryDependencies ++= Seq(
  "net.databinder" %% "dispatch-twitter" % "0.8.3",
  "net.databinder" %% "dispatch-http" % "0.8.3"
)
*/

import dispatch.{ json, Http, Request }
import dispatch.twitter.Search
import json.{ Js, JsObject }

def process(param: JsObject) = {
  val Search.text(txt)        = param
  val Search.from_user(usr)   = param
  val Search.created_at(time) = param

  "(" + time + ")" + usr + ": " + txt
}

Http.x((Search("#scala") lang "en") ~> (_ map process foreach println))

Paul's xsbtscript is basically a shell that downloads and install all necessary components to do the same thing. It usually works well, but has some limitations (won't go through authenticated proxies, for instance).