Enso Language Support for VSCode

Downloading

Enso Tools for VSCode is available from VSCode marketplace. Simply install it from there.

It is possible to download the latest development version of the "VSCode Extension" artifact from the latest actions run. After downloading the ZIP file unzip a .vsix from it and install the .vsix file into VSCode.

Your Enso files will get proper syntax coloring. You'll be able to debug Java/Enso code interchangeably.

After installing the Enso .vsix file (and reloading window) we can find following two extensions in the system:

Outline View

Since version 1.40 the extension fills content of Outline View on supported platforms (Linux amd64, Mac, Windows):

Debugging a Single Enso File

Open any .enso files. Click left editor gutter to place breakpoints. Then choose Run/Start Debugging. If asked, choose debug with Java+ (Enso is Java virtual machine friendly). A prompt appears asking for path to bin/enso binary:

Locate bin/enso executable in the Enso engine download. If binding from source code, the executable is located at root of Enso repository in ./built-distribution/enso-engine-*/enso-*/bin/enso. The .enso file gets executed and output is printed in the area below editor:

Workspace Debugging

To work with all Enso code base continue with choosing File/Open Folder... and opening root of Enso Git Repository (presumably already built with sbt buildEngineDistribution). Following set of projects is opened and ready for use:

With the workspace opened, you can open any Enso or Java file. Let's open for example Vector_Spec.enso - a set of unit tests for Vector - a core class of Enso standard library:

It is now possible to place breakpoints into the Vector_Spec.enso file. Let's place one on line 120:

To debug the test/Base_Tests/src/Data/Vector_Spec.enso file with the root of Enso repository opened in the VSCode workspace, choose preconfigured Launch Enso File debug configuration before Run/Start Debugging.:

The rest of the workflow remains the same as in case of individual (without any project ).enso file case.

Attach Debugger to a Process

Let's do a bit of debugging. Select "Listen to 5005" debug configuration:

And then just execute the engine distribution in debug mode:

sbt:enso> runEngineDistribution --debug --run test/Base_Tests/src/Data/Vector_Spec.enso

After a while the breakpoint is hit and one can inspect variables, step over the statements and more...

...as one can seamlessly switch to debugging on the Enso interpreter itself! One can place breakpoint into Java class like PanicException.java and continue debugging with F5:

Should one ever want to jump back from Java to Enso one can use the "Pause in GraalVM Script" action. Select it and continue with F5 - as soon as the code reaches a statement in Enso, it stops:

Read more on Enso & Java Debugging

Building VSCode Extension

To build this VSCode extension and obtain Enso syntax coloring as well as support for editing and debugging of engine/runtime sources in VSCode:

enso/tools/enso4igv$ mvn clean install -Pvsix
enso/tools/enso4igv$ ls *.vsix
enso4vscode-*.vsix

one needs to have npm, Java and mvn available to successfully build the VSCode extension.

Once the .vsix file is created, it can be installed into VSCode. Select Extension perspective and choose Install from VSIX... menu item.

Reference

There are extensions for NetBeans and also for IGV. Read more here.