[Dune] Problems with a string return by Dune

Learning
,
1

Hello everyone,

First of all, sorry for my poor English, I’m pretty new to Dune so I may not fully understand what you reply to this topic and thanks a lot in advance.

So the problem I try to solve is some bash formatting characters are added to the version of the server (here 0.12). As you can see below, this is what i get :

--------------------- Fri May 14 13:30:21 2021 ---------------------
API version mismatch: client v.0.12 and server v.e[m0.12e[0m

and this is the code that produce the line above.

(rule
 (targets VERSION)
 (action (with-stdout-to %{targets}
           (run opam show ./%{dep:./learn-ocaml.opam} -f version --normalise)))
)

I don’t understand how it happens because when I’m trying this command directly in my terminal:

opam show ./learn-ocaml.opam -f version --normalise

It return only 0.12.

Do you have any ideas?

Thanks again for your help.

2

The issue seems unrelated to dune, but rather due to opam show outputting some ANSI codes that end up in your VERSION file. Try passing --color never:

(rule (with-stdout-to VERSION (run opam show --color=never ...)))

Cheers,
Nicolás

3 Likes
3

That solution solved my problem, thanks a lot for your help.

Cheers,
Louis.