Alex, a couple years ago, Stefan Jacholke built something like this for CodeWorld, which is a variant of Haskell. It's not general-purpose and builds for a custom prelude, but it might be worth looking at. You should be aware that while I've kept it basically working, there are plenty of known bugs.

Available at https://code.world/blocks

On Thu, Apr 26, 2018, 1:48 AM Alex McLean <alex@slab.org> wrote:

Hi all,

I'm wondering if anyone has made a 'block editor' for Haskell, i.e. a
syntax-aware text editor where you make a program by snapping together
type-compatible words, usually with a mouse. Something similar to
Scratch for example: https://scratch.mit.edu/

Any leads appreciated!

Best wishes

alex
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