ghcjsi missing

[luite]

Even though GHCJS builds native code for everything, for some reason we don't have GHCJSi (or ghcjs --interactive), for some inexplicable reason (other than me not having infinite available time).

We should try to make this work, so that cabal repl would work as expected with GHCJS projects.

[luite]

So with the default installation changed to not build native code, GHCJSi should run JavaScript code instead. With the node.js requirement and Template Haskell infrastructure (incremental code loading / execution) already in place this shouldn't be particularly hard to do.

[joelburget]

I vaguely remember recently seeing a brief video of a ghcjs repl. Can you point me to it? Also, when can we expect it to land in master?

[luite]

I haven't published any videos myself, only screenshots. Anyone else could've built the ghcjsi branch to make a video of course. It will take quite a bit of work before it's really ready, the code is currently a hack and not quite complete, so I'd say at least a few months realistically. At the moment the new codegen and ES2015 support have priority.

screenshot: http://hdiff.luite.com/tmp/ghcjsi1.png

[schell]

@luite, what's the status on this? I saw some of your talk on ghcjsi and it looks great, though I can't seem to find a ghcjs build that includes it. I'm currently running stack ghci and get this error message:

Configuring GHCi with the following packages: event-transformer, lowbrow, varying
ghcjs-0.2.0.820160908-8.0.1.bin: --interactive is not yet supported.
Usage: For basic information, try the `--help' option.

[Profpatsch]

The ghcjsi branch is not yet merged into the ghc-8.0.1 branch.

I have started merging the two, but not enough knowledge of the compiler to fix the merge problems. I will open a PR with the partly merged branches, so maybe @luite can take a look at it.

[Profpatsch]

Here’s the PR: #549