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Installing from sources

Prerequisites

Ensure a JDK 8 is installed on your machine

$ java -version
java version "1.8.0_121"
Java(TM) SE Runtime Environment (build 1.8.0_121-b13)
Java HotSpot(TM) 64-Bit Server VM (build 25.121-b13, mixed mode)
$ javac -version
javac 1.8.0_121

Ensure an sbt launcher is installed

$ sbt -help
Usage: sbt [options]

[…]

If it's not, sbt-extras or the default installer from the sbt website should do.

Compiling

Check-out the sources with

$ git clone https://github.com/almond-sh/almond.git
$ cd almond

Compile and publish the kernel locally with

$ sbt publishLocal

This installs the kernel artifacts under your ~/.ivy2/local local repository. The kernel artifacts should land under ~/.ivy2/local/sh.almond/ in particular. In the output of sbt publishLocal, note the snapshot version the kernel is installed with. At the time of writing this, this version is 0.1.11-SNAPSHOT.

Installing

Create a launcher with

$ SCALA_VERSION=2.12.7 ALMOND_VERSION=0.1.11-SNAPSHOT
$ coursier bootstrap \
    -r jitpack \
    -i user -I user:sh.almond:scala-kernel-api_$SCALA_VERSION:$ALMOND_VERSION \
    sh.almond:scala-kernel_$SCALA_VERSION:$ALMOND_VERSION \
    --sources --default=true \
    -o almond-snapshot --embed-files=false

Compared to the default installation instructions, --embed-files=false is added as an option. This makes the generated launcher directly rely on files under ~/.ivy2/local, rather than copying those in the launcher. If the files under ~/.ivy2/local are updated (e.g. with a new sbt publishLocal), just restarting the kernel is enough for these to be picked, which is useful for fast iterations during development.

Then install the kernel with

$ ./almond-snapshot --install \
    --id scala-snapshot \
    --display-name "Scala (snapshot)"

Optionally, change the log level with e.g. --log debug. If you'd like these logs to go to a distinct file rather than in the console, pass e.g. --log-to "/path/to/log-file.txt".

Development cycle

Once the kernel is installed this way, one can update its artifacts with sbt publishLocal. These are taken into account by restarting the kernel.

Re-generating an installer, and installing it, is only necessary if the dependencies of the kernel are changed / updated, or if the kernel version changes. It is safer to re-generate an installer and install it after a git pull in particular.

sbt crash course

Running sbt with no options starts an sbt shell

$ sbt
[…]
>

At the sbt prompt, type

  • compile to compile the main sources,
  • test:compile to compile both the main and test sources,
  • test to run all the tests,
  • publishLocal to publish the projects locally (these land under ~/.ivy2/local).

All these commands can be prefixed with a project id, like kernel/test or interpreter/publishLocal. List the available projects with projects.

Note that sbt knows about the dependencies between commands, so that you can directly run test. This triggers a compilation of the main and test sources if needed. Sources are automatically compiled incrementally.

~ can be added as prefix to watch sources, like ~test:compile or ~kernel/publishLocal.

To run one or several commands from your shell rather than the sbt prompt, pass those to sbt, like

$ sbt "~test:compile"
$ sbt interpreter/test "~publishLocal"

Note that the sbt start up time is incurred each time you type sbt in your shell. Running it once, like $ sbt, then entering commands at the sbt prompt allows to avoid this.

Select a specific scala version, for example 2.11.12, with ++2.11.12. Example of use

$ sbt ++2.11.12 "~test:compile"
$ sbt
> ++2.11.12
> interpreter/test

List the available scala versions with the show crossScalaVersions command, like

$ sbt "show crossScalaVersions"
$ sbt
> show crossScalaVersions

Note that show crossScalaVersions is quoted when passed to sbt from the shell, so that sbt interprets it as a single command.