Is there a configuration file for Scala REPL / SBT Console?

Question

I've been trying to find some sort of a dotfile to put Scala REPL settings and custom function in.

In particular I'm interested in passing it flags like -Dscala.color (enables syntax highlighting), as well as overriding settings like result string truncation:

scala> :power
scala> vals.isettings.maxPrintString = 10000

It would be nice to have these settings apply to both the simple Scala REPL sessions as well as sbt console sessions.

Does such a central configuration place exist for Scala?

score 4 · Answer 1 · edited Oct 26 '15 at 14:55

4

Poor man's solution: Set yourself an alias

alias myScala='scala -Dscala.repl.axPrintString = 10000'

edited Oct 26 '15 at 14:55

Seth Tisue

29,985
11
82
149

answered Oct 26 '15 at 13:50

Andreas Neumann

10,734
1
32
52

score 4 · Answer 2 · answered Oct 26 '15 at 14:24

4

Maybe you can use a modernized Scala REPL:

https://lihaoyi.github.io/Ammonite/

answered Oct 26 '15 at 14:24

Twistleton

2,735
5
26
37

Ammonite has some rough edges, but is totally awesome. – Haspemulator Oct 26 '15 at 14:30

score 3 · Answer 3 · answered Oct 26 '15 at 08:59

3

As mentioned here ~/.sbt/0.13/global.sbt is the global configuration file for sbt. You can change your global settings here, this probably not going to effect REPL but should do work with SBT Console

answered Oct 26 '15 at 08:59

Hüseyin Zengin

1,216
11
23

3

I made `.sbt/0.13/plugins/color.sbt` and put this in it: `initialize ~= (_ => if (ConsoleLogger.formatEnabled) sys.props("scala.color") = "true")` – Seth Tisue Oct 26 '15 at 14:55

score 1 · Answer 4 · edited May 23 '17 at 10:30

You mainly asked about property settings, this goes a little beyond that to consider loading a definitions file as well—and isn't much help for Windows—but I thought I'd share in case it's useful:

I've resorted to using a wrapper script saved as ~/bin/scala, to set config properties and load some utility functions:

#!/bin/sh

# The scala REPL doesn't have any config file, so this wrapper serves to set
# some property values and load an init file of utilities when run without
# arguments to enter REPL mode.
#
# If there are arguments, just assume we're running a .scala file in script
# mode, a class or jar, etc., and execute normally.

SCALA=${SCALA:-/usr/local/bin/scala}

if [ "$#" -eq 0 ] && [ -r ~/.config/scala/replinit.scala ]; then
    exec "$SCALA" -i ~/.config/scala/replinit.scala -Dscala.color
else
    exec "$SCALA" "$@"
fi

If you sometimes use Ammonite REPL, as another answer suggests, the utility definitions can be shared by loading them from ~/.ammonite/predef.scala:

try load.exec(ammonite.ops.home/".config"/'scala/"replinit.scala")
catch { case _: Exception => println("=== replrc not loaded! ===") }

I'm not sure about a way to load the init file for sbt console automatically, though—Seth Tisue's comment about the initialize setting is helpful for properties, but using a :load command in a value for initialCommands in console doesn't appear to work.

Is there a configuration file for Scala REPL / SBT Console?

4 Answers4

Linked