2011 11 15 scala as scripting language - raisercostin/raisercostin.github.io GitHub Wiki

Date: 2011-11-15 Title: Scala as scripting language Tags: howto Slug: scala-scripting Created: 2011-11-15 Update: 2017-05-16

Problem

What is the solution that satisfies all these constraints:

  • Write a script in scala (for example to process some files pdf files via apache poi library)
  • You have dependencies on some external libraries. And want to solve the transitive dependencies.
  • You want auto-completion to work in your favorite IDE (years ago I didn't realized that)

Solution

Analysis

Solution space

A solution must be along the lines:

  • Add libraries on the classpath but you don't have transitive dependencies.
  • Clearly you must use a proper build tool: sbt, maven for two purposes:
    • transitive dependencies
    • project generation in your IDE
    • use features like autocompletion (does it work in REPL?)

Resouces

Deprecated

Solution 1 - Windows

Configure file type associations

As admin you should run the following in console:

assoc .scala=scalafile
ftype scalafile=<replace_with_scala_home>\bin\scala.bat -savecompiled "%1" %*

If you don’t want to always add the extension make sure .scala is executable by adding .scala to the PATHEXT variable

set PATHEXT=.scala;%PATHEXT%

(to make it long term you should actualy use this method http://www.itechtalk.com/thread3595.html)

Configure a folder for scripts

Now you can add to the path a place where you can put your .scala scripts

set PATH=<replace_with_scala_scripts_folder>;%PATH%

Create first script In <replace_with_scala_scripts_folder>\hi.scala you should add:

#!/bin/sh
exec scala "$0" "$@"
!#
println("hello world in scala script")
args foreach println
println("done")

Execute first script Now from anywhere you can execute:

hi 1 2 3

This will print

hello world in scala script
1
2
3
done

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