Merlin fails only on VS Code

[AntouanK]

Started using bucklescript yesterday, and the ocaml plugin in VSCode has a weird behaviour.
Initially, when I got merlin, autocomplete worked fine. Once I started working on examples on bucklescript, I noticed merlin didn't work anymore.
I checked it with vim, and I had problems there as well, but they were fixed.
ocaml/merlin#617
So right now, merlin in vim works perfectly.
Also, I checked that ocamlmerlin and ocp-indent are available in the PATH and they work as expected.
Still, in VSCode merlin doesn't work at all.

Any help on how to debug this?

Thank you.

[AntouanK]

Seems like the problem is that I use zsh as my main shell, and my PATH is defined in .zshrc.
If I launch VSCode manually from a zsh shell, merlin works.

So where can I put PATH so that VSCode can read it?

[hackwaly]

You can open the developer tool of vscode, and then check process.env on the console to see what env vscode recognised

[hackwaly]

You can use opam setup the shell init script. I remember it works

[AntouanK]

Interesting...
Seems like the shell is correct, but the environment variables are entirely different.

Opening VS Code normally

Opening VS Code from a zsh session ( with open -a "Visual Studio Code" )

[eimpec]

I have somewhat similar issue with merlin failing on VSCode. It fails only with the file which uses js_of_ocaml ## syntax. When I start hovering the mouse over expressions, after few successful attempts the hover modal just starts showing "Loading..." and the CPU usage of merlin jumps to 100% until the process is killed. Other files seems to be working just fine.
See the merlin log attached
merlin.txt
The link to the actual file: https://github.com/bobatkey/ocamlmvc/blob/master/OCamlMVC.ml

[hackwaly]

Sorry for the late response. Now it is the Spring Festival in China, I have not enough time to address this issue. I'll work for the bucklescript and js_of_ocaml support later.

[hackwaly]

@AntouanK

Seems like the problem is that I use zsh as my main shell, and my PATH is defined in .zshrc.
If I launch VSCode manually from a zsh shell, merlin works.

So where can I put PATH so that VSCode can read it?

I've tested on my mac that zsh works well. All env defined in ~/.zshrc works fine. Maybe you've config vscode incorrectly. I found some clues: microsoft/vscode#10500.

If your vscode can't get right env, It's an issue of vscode and I can help less.