Option to Disable Merlin (important for Windows)

[superherointj]

Merlin windows support is broken.

Having an option to disable Merlin is desirable for:

• Suppressing errors.
• Enabling BsRefmt. (doesn't work if Merlin is broken.)
• Enjoying syntax highlighting error free.

Even if Merlin is sorted out it still makes sense having a way to disable it. Because:

• The 'ocaml-for-windows' hack shouldn't be required.
• Merlin is optional.
• Merlin might be replaced by another tool later. (Like bsb errors)
• For debug purposes
• Merlin might become broken again. Who knows?
• Other uses we are not aware now.

Either Merlin works or it's necessary to allow disabling for scenarios it doesn't work.

[yawaramin]

This relates to reasonml/reason#1190

[OlegLustenko]

you can try reasonml/reasonml.github.io#109

it mostly works for me out of the box, only 1 requirements you need to set this in vscode settings

 "reason.path.ocamlfind": "ocamlfind.cmd",
  // The path to the `ocamlmerlin` binary.
  // "reason.path.ocamlmerlin": "ocamlmerlin.cmd",
  // The path to the `opam` binary.
  "reason.path.opam": "opam.cmd",
  // The path to the `rebuild` binary.
  "reason.path.rebuild": "rebuild.cmd",
  // The path to the `refmt` binary.
  "reason.path.refmt": "refmt.cmd",
  // The path to the `refmterr` binary.
  "reason.path.refmterr": "refmterr.cmd",
  // The path to the `rtop` binary.
  "reason.path.rtop": "rtop.cmd",

[superherointj]

Did: npm install -g ocaml-on-windows
Now I have ocaml 4.04.0 in path + tools in Windows Command Prompt (good!)
Refmt is working on VSCode. (great!)

But Merlin is still not working...

Current VSCode configuration:

{
"reason.path.ocamlfind": "ocamlfind.cmd",
"reason.path.ocamlmerlin": "ocamlmerlin.cmd",
"reason.path.opam": "opam.cmd",
"reason.path.rebuild": "rebuild.cmd",
"reason.path.refmt": "refmt.cmd",
"reason.path.refmterr": "refmterr.cmd",
"reason.path.rtop": "rtop.cmd",
"reason.formatOnSave": true
}

Current VSCode errors:

ocamlmerlin error: sh: 1:
ocamlmerlin error: C:UsersUsernameAppDataRoaming: not found
ocamlmerlin error: sh: 1: C:UsersUsernameAppDataRoaming: not found
ocamlmerlin error: sh: 2: pm: not found

I find really weird/fishy this 'C:UsersUsernameAppDataRoaming' error. A path problem... But how to fix it?

[fhelwanger]

It seems that merlin isn't finding your project's path.

Did you opened a file or a folder on vscode? If you opened a file, try opening your project's root folder.

[superherointj]

I have opened VSCode in the project folder exactly where '.merlin' file is. Any other idea?

[fhelwanger]

Oh, it's happening for me too. I get:

ocamlmerlin error: sh: 1: C:Tempocaml
eason-react-example: not found

Something must have changed lately that is handling \ as an escape char 😞

[frankwallis]

Also related ocaml/merlin#684

[superherointj]

It is working now. I'll close this.

Update: It only fixed somewhat. There is still a situation that it is broken. Considering the existence or not of Merlin file. And it's content. Depending on which environment the file was generated (Linux/Windows) it get's broken.

[frankwallis]

@superherointj good news! What changed to make this work? do I need to upgrade merlin?

[superherointj]

Just updated VSCode extension to version 1.0.1. There was a patch this night. I already had 'ocaml-on-windows' installed.

[superherointj]

It seems the problem persists if Merlin file is present.