12:12 <discocaml> <lukstafi> Installing `opam` from source on FreeBSD now. Man it takes hours, and with the nice UI to configure dependencies...

12:23 <Johann> Hi, I try to create a pretty printing function that would accept optional argument such as `let pp ?(pp_sep fmt () = ()) fmt t = ...`. My issue is, how can I use it without the optional parameter in context such as `Format.printf "%a" pp my_var`? It raises a type error since the type doesn't match.

12:26 <Johann> I guess I have to use `fun f t -> pp f t` instead of pp directly but it is a little ugly and I m wondering if there is a better way

12:34 <discocaml> <_ggole> You can put a `()` after the optional argument, and if you pass that arg the optional argument will be erased; then you can use `(pp ())` instead of just `pp`

12:34 <discocaml> <_ggole> Still a bit ugly

12:35 <discocaml> <_ggole> Maybe better to just have two different functions

12:35 <octachron> You can also use (pp ?pp_sep:None).

12:37 <octachron> Another option is to use %t format specifier rather than %a.

12:37 <octachron> which would replace `Format.printf "%a" pp my_var` by `Format.printf "%t" (pp my_var)`.

12:38 <octachron> which is friendler to optional argument.

12:38 <discocaml> <_ggole> I always forget that `%t` even exists

12:41 <Johann> thanks I didn't know about `%t`!

12:45 <mro> TIL %t, thanks octachron!

12:47 <octachron> Note that it requires a different `pp` function that takes the formatter argument last. (which can be sometimes easier to define with `dprintf` rather than `fprintf`: `let pp (x,y) = Format.dprintf "(%d,%d)" x y`

12:49 <mro> ic

13:28 <companion_cube> I forget about dprintf

13:28 <companion_cube> @since 4.08 <--- awesome!!

14:24 <discocaml> <froyo> format is such a rabbit hole

14:27 <companion_cube> it is, but it's also awfully convenient

14:43 <discocaml> <darrenldl> i still have no clue if `@[<v>%a@,@]` is the right way end with a newline, but good enough im hoping

14:47 <discocaml> <lukstafi> (I made the mistake if not listing the dependencies and trying to `pkg install` as much as possible before invoking `make install`.)

15:03 <discocaml> <lukstafi> 🤦‍♂️ `pkg install ocaml-opam` would work. (Ahh I somehow tried `pkg install opam` I think?)

15:52 <mro> pkg? Are you on freebsd, too?

18:12 <discocaml> <lukstafi> I'm trying to install freebsd but not feeling good about it. Haven't managed to `startx` yet. I had previously used NomadBSD for testing, had better luck with it but wanted the more standard distribution.

18:32 <discocaml> <druimalban> It used to be harder (especially with Nvidia drivers) but it's got a lot better since 11.0-RELEASE. Make sure your user is in the video group (see pw(8)) and it's usually easiest to start X with xdm(8)

18:37 <discocaml> <druimalban> IME OpenBSD and NetBSD have historically had better working X11 out of the box. But it was OpenSolaris (and its descendents) which have the most friendly and well-thought-out X11 environment of any.

20:31 <discocaml> <Alistair> When running `dune build @doc` I get a bunch of `Warning: Failed to resolve reference unresolvedroot(Invalid_argument) Couldn't find "Invalid_argument"` errors, any idea on how to fix this?

21:06 <discocaml> <lukstafi> @mro With NomadBSD, graphics and WiFi worked out of the box, but `opam update` was hanging indefinitely for me.

23:25 <discocaml> <froyo> niklaus wirth, the man whose design fingerprints were all over ml and subsequently ocaml, died on jan 1st

23:33 <companion_cube> RIP