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client certificate requested) by ssl.polytechnique.org (Postfix) with ESMTPSA id BF28C5647CF; Tue, 7 Sep 2021 15:24:04 +0200 (CEST) From: Alan Schmitt To: "lwn" , "cwn" , caml-list@inria.fr Date: Tue, 07 Sep 2021 15:23:55 +0200 Message-ID: <87eea08qok.fsf@m4x.org> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="=-=-=" X-AV-Checked: ClamAV using ClamSMTP at svoboda.polytechnique.org (Tue Sep 7 15:24:05 2021 +0200 (CEST)) X-Spam-Flag: Unsure, tests=bogofilter, spamicity=0.489620, queueID=251B75647D0 X-Org-Mail: alan.schmitt.1995@polytechnique.org Subject: [Caml-list] Attn: Development Editor, Latest OCaml Weekly News Reply-To: Alan Schmitt X-Loop: caml-list@inria.fr X-Sequence: 18561 Errors-To: caml-list-owner@inria.fr Precedence: list Precedence: bulk Sender: caml-list-request@inria.fr X-no-archive: yes List-Id: List-Help: List-Subscribe: List-Unsubscribe: List-Post: List-Owner: List-Archive: Archived-At: --=-=-= Content-Type: text/plain; charset=utf-8 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OCaml Weekly News

Previous Week<= /a> Up Next Week

Hello

Here is the latest OCaml Weekly News, for the week of August 31 to Septembe= r 07, 2021.

Just reinvented OOP

Archive: https://discuss.ocaml.org/t/just-reinvented-oop/8399/1

Yawar Amin said

let ( .![] ) obj f =3D f obj

type person =3D { id : int; name : string }

let id { id;=
 _ } =3D id

let bob =3D { id =3D 1; name =3D "Bob" }
let next_id =3D bob.![id].![succ]

=3D=3D> 2

Kiran Gopinathan replied

Haha, what a coincidence, just did the same very recently while translating= a rust library to OCaml: https://github.com/Gopiandcode/ego/bl= ob/5daf312f8a444f9abcde5996c671b9282727a972/lib/generic.ml#L211 

let eclasses =3D eg.@[eclasses] in
let cost_map =3D Id=
.Map.create 10 in=

let node_total_cost node =3D
  let has_cost id =3D Id.Map.mem cost_map (eg.@[find] id) in
  if List.for_all has_cost (L.chi=
ldren node)
  then let cost_f id =3D fst @@ Id.Map.find cos=
t_map (eg.@[find] id) in Some (E.cost cost_f
node)
  else None in
  (* ... *)

with .@[] defined as: 

let (.@[]) self fn =3D fn self=
 [@@inline always]

for bonus(?) points, you can name the first parameter self: 

let add_enode self (node: Id.t L.shape) =3D
  let node =3D self.@=
[canonicalise] node in
  (* ... *)

I don't normally write code like this in OCaml, but in this case, it made p= orting from rust easier, because the code mostly looked the same.

hyphenrf also replied

You can use the multiple-indexing syntax to implement slicing (well, techni= cally subs) sugar: 

let (.:[;..]) s =3D function
  | [|start; finish|] -> String.s=
ub s start (finish - start)
  | _ -> raise (Invalid_argument "sli=
ce takes exactly two indexes")

# "hello world".:[1;5];;
- : string =3D "ello"

The new indexing syntax is quite versatile :>

Kiran Gopinathan added

Oh wow, this is perfect! brb, off to reimplement the python slicing semanti= cs in OCaml: 

let (.@[;..]) ls =3D functio=
n[@warning "-8"]
  | [| start; -1 |] ->
    List.to_iter ls
    |> Iter.zip_i
    |> Iter.drop_while (Pair.f=
st_map ((>) start))
    |> Iter.map snd
  | [| start; finish |] ->
    List.to_iter ls
    |> Iter.zip_i
    |> Iter.drop_while (Pair.f=
st_map ((>) start))
    |> Iter.take_while (Pair.f=
st_map ((>) finish))
    |> Iter.map snd
  | [| start; finish; step |] ->
    List.to_iter ls
    |> Iter.zip_i
    |> Iter.drop_while (Pair.f=
st_map ((>) start))
    |> Iter.take_while (Pair.f=
st_map ((>) finish))
    |> Iter.filter (Pair.fst_m=
ap (fun ind -> (ind - start) mod step =3D 0))
    |> Iter.map snd

v3.OCaml.org: A roadmap for OCaml's online presence

Archive: https://discuss.ocaml.org/t/v3-ocaml-org-a-= roadmap-for-ocamls-online-presence/8368/19

Continuing this thread, Anil Madhavapeddy replied to = many comments

Many thanks for all the constructive comments and suggestions so far, and a= lso for those who have gotten in touch to contribute. Please do keep them coming (either on t= his thread or on the various issue trackers that @jonludlam and @patricoferris have pointed = to). I'll answer some earlier questions here:

Having said that, the colors on the packages landing page feel very aggressive to me. Might be my setup here, but I would like to hav= e a slightly less harsh contrast.

Also, there is a bit of an overlap in content with https://ocamlverse.github.io/ for some things (eg best practices, community) but the (to me) most valuable feature is missing: The ecosystems overview, where I can = find packages sorted thematically. Could such a section also have a place in the packages= subpage somewhere? Alternatively, maybe opam can allow to =E2=80=9Ctag=E2=80=9D packages in th= e future so one could see all packages for graphics, databases etc.

The styling of the /packages sub-URL does indeed differ from the main desig= n, but this is simply due to a temporary technical detail. The majority of the site uses R= eact/NextJS to generate the frontend, and this uses the now-trendy medium-contrast colours= and also features like fast-page-switching that NextJS offers. However, the documentation po= rtion generated around 2.7 million individual pages when run across the full opam repositor= y, and so we restored to dynamic generation of the content for that. What's going to hap= pen next is a rationalisation of the code across the ReScript and OCaml frontends so that= there will be no observable difference in the colour schemes across the full site.

Regarding creating a categorised list of recommendations, that is absolutel= y in scope for the v3 iteration of the site. However, this metadata should ideally live in the= opam-repository (for example, using tags as you suggest, which opam already su= pports). If anyone would like to have a go at this, I'd encourage PRs to the opam-repository to add the r= elevant tag metadata for a codex. Meanwhile, @lambda_foo @tmattio and @patricoferris ar= e working on the core OCaml Platform workflow information for the guides section of the webs= ite which will cover opam, merlin, lsp-server, dune and so on.

Do we have access to all of the previous years=E2=80=99 workshops to add to= watch.ocaml.org? I can see pieces of 2015, 2017, 2020 and this year. @avsm

Is it possible to add the ML Workshop as well?

Absolutely. The watch.ocaml.org has held up nicely after the OCaml Workshop= , so I think it's in good shape to populate with more videos. This needs a volunteer to help = us upload the past nine years of videos= from YouTube to watch.ocaml.org. If anyone wants to have a go, please message me and I'll c= reate you an account.

It=E2=80=99s a bit unclear what you meant in this paragraph. Does that mean= that you plan to kill the ocaml planet ? I would find it a little bit sad.

One of the reason why you may feel it doesn=E2=80=99t work well may be that= it has been constantly broken in the current version of the site=E2=80=A6

I'm not sure why you think the current ocaml.org new feed has been broken &= #x2013; it's been working fairly reliably for the past decade. The only real problem came up = a few times when a feed's domain expired and got taken over by domain squatters, at which poin= t we got spam into the main page of ocaml.org.

What I meant with that part of the announcement is that the syndication fee= d should not be mistaken with original news on the website. Right now it's difficult to dis= tinguish official announcements (such as compiler or opam releases) as they are a little scat= tered (e.g. on opam.ocaml.org). The plan is to combine the platform-blog with t= he new website directly. I've also been considering just having a special tag on this forum so that nice = announcement posts could also be syndicated to the website easily (for example, @gasche's comp= iler newsletters).

My general desire is to grow the planet fe= ed and syndication system, but to clearly demarcate them as not being published by ocaml.org and to manage them via m= ore modern decentralised techniques that feature spam, moderation and archival. PeerTu= be is a good example of this for videos that is working well, and I'd welcome suggestion= s for Atom/RSS (there must be something in this space, ideally ActivityPub-based).

Depending on how the experiments go, it's very likely that we'll have a Mat= rix homeserver for ocaml.org where CI bots can report status information (see this prototype PR) for ocaml-ci that will also apply to opam-repository. The goal here is to for ocaml.org to publish its data usin= g an open protocol, which can then be syndicated into whatever technologies are in vo= gue (e.g. Discord, Slack, Teams, …).

So if you spot some decentralised syndication system that you think might b= e interesting for OCaml, please do let me know. Even better, if you'd like to develop one to= tailor it to our needs, let me know even sooner ;-)

Become an Outreachy Mentor: support the growth and diversity o= f the OCaml community

Archive: https://dis= cuss.ocaml.org/t/become-an-outreachy-mentor-support-the-growth-and-diversit= y-of-the-ocaml-community/8213/3

Anil Madhavapeddy announced

There's been a very disappointing response to this call for mentors to incr= ease the diversity of our community. Precisely noone has been in touch for the winter c= all, leaving the burden of mentorship on the same people that did all the work this summer.

Before making new calls for programs like GSoC, let's get Outreachy onto more sustainable ground please. We are purely limi= ted by mentorship time at present. This can be as simple as organising new first issues for p= rojects in the ecosystem, and all the way to pair programming with a mentee. You can chose= how to be involved.

Generating static and portable executables with OCaml

Archive: https://discuss.ocaml.org/t/generating-s= tatic-and-portable-executables-with-ocaml/8405/1

OCamlPro announced

It has been a few times now that we have been tasked to generate portable b= inaries for different projects. Over time, we have gathered quite some know-how and, se= eing the question frequently arise in the community, we decided to share this experience.

You can find the article written by Louis Gesbert on the OCamlPro blog

Distributing OCaml software on opam is great (if I dare say so myself), but= sometimes you need to provide your tools to an audience outside of the OCaml community, o= r just without recompilations or in a simpler way.

However, just distributing the locally generated binaries requires that the= users have all the required shared libraries installed, and a compatible libc. It's not so= mething you can assume in general, and even if you don't need any C shared library or are c= onfident enough it will be installed everywhere, the libc issue will arise for anyone using= a distribution based on a different kind, or a little older than the one you used to build.

There is no built-in support for generating static executables in the OCaml= compiler, and it may seem a bit tricky, but it's not in fact too complex to do by hand, s= omething you may be ready to do for a release that will be published. So here are a few tric= ks, recipes and advice that should enable you to generate truly portable executables with n= o external dependency whatsoever. Both Linux and macOS will be treated, but the exampl= es will be based on Linux unless otherwise specified.

Don't hesitate to share your thoughts with us, have a good reading!

OCaml quant-developer at Bloomberg. London or New York

Archive: https://discuss.ocaml.org/t/ocaml-quant-= developer-at-bloomberg-london-or-new-york/8409/1

Philip Craig announced

Extend a financial contracts DSL that is implemented in OCaml.

It's London or New York based. It's not a remote position.

Please see details and/or apply at (https://careers.bloomberg.com/job/detail/93825)

HTTP client library

Archive: https://discuss.ocaml.org/t/ann-http-client-library/8428/1

Hannes Mehnert announced

we just released to the opam-repository the http-lwt-clien= t package, which consists of both a library doing HTTP requests and a binary (hurl) that do= es HTTP requests.

The code is based on HT= TP/AF and H2, and uses tls for HTTPS connecti= ons. Both HTTP/1(.1) and HTTP/2 protocols are supported. The motivation behind this package is to have a ht= tp client that has a reasonably small dependency cone, is purely implemented in OCaml, and use= s the asynchronous task library lwt.

This package uses hap= py-eyeballs to connect to a remote host via IPv4 and IPv6, as proposed by IETF RFC 8305: on any computer with either IPv4 or IPv6 connectivity, a remote IPv6 or IPv4 server will be connected. Preference is= given to IPv6.

If a https url is provided, the server certificate is verified using the ca-certs package.

If you experience any issues or have further needs for this package, please= report an issue on the GitHub issue tracker.

The installation is just an opam install http-lwt-client away = :)

Old CWN

If you happen to miss a CWN, you can send me a message and I'll mail it to you, or go take a loo= k at the archive or the <= a href=3D"https://alan.petitepomme.net/cwn/cwn.rss">RSS feed of the archive= s.

If you also wish to receive it every week by mail, you may subscribe online.

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