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=?us-ascii?q?5CXBHfeWlFtxIcMIEFxHBKoV3SFPmygZp8/MW4GF13QMVgCsRVJW9D7t?= =?us-ascii?q?DW2e92pgxlIKFYdk6w9tHTcA=3D=3D?= Received: from mx1.polytechnique.org ([129.104.30.34]) by mail3-smtp-sop.national.inria.fr with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 09 Aug 2022 10:02:51 +0200 Received: from set (lfbn-cle-1-507-42.w90-114.abo.wanadoo.fr [90.114.250.42]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ssl.polytechnique.org (Postfix) with ESMTPSA id 4096D56482C; Tue, 9 Aug 2022 10:02:45 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=polytechnique.org; s=svoboda; t=1660032169; bh=4KS7JPtL5lsWjIW+8req/2jWnfY3GyNrXintjymF7d8=; h=From:To:Subject:Date:Message-ID; b=05pcLf/qZZNWkwNqml7DLkivVIbuBAvC/V45zjbA3YgorwefByPZtAHPa8QYG7vTl Mh2TVQpu4V8RS3hPYaD/uOrHjOLECLuJ57EI4i2Shf3ySZijVD+i77IpF2m9Bzc5Op bSPFLkAQx5dj0FL/3r5Pz7z25FfGC156I07y92jA= From: Alan Schmitt To: "lwn" , "cwn" , caml-list@inria.fr Date: Tue, 09 Aug 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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 02 to 09, 2022.

pyml_bindgen: a CLI app to generate Python bindings directly f= rom OCaml value specifications

Archive:

Ryan Moore announced

New stuff

New attributes

There is a new attribute you can use: py_arg_name. It allows y= ou to use different argument names on the OCaml side from those that are used on the Python side.

One use case is for Python functions that have an argument name that is the= same as some reserved OCaml keyword. In this case, you can use py_arg_name to map it to something else= on the OCaml side. 

val f : t -> method_:string -> unit -> string
[@@py_arg_name method_ method]

The attribute is followed by two items, the first is the argument name on t= he OCaml side, and the second is the argument name on the Python side.

See the attributes example on GitHub for more info.

Helper scripts

I added a couple of scripts to help in cases where you need to run py= ml_bindgen on a lot of different input files in one go. I have been using them when writing bindings for bigger Python = libraries, and in cases where there are a lot of cyclic python classes to bind.

This example has more info about using the helper scripts.

Other stuff
  • Added an option to split generated modules into ml and mli files.
  • Added a dev package for (hopefully) easier installation of development = dependencies.

Interesting OCaml Articles

Archive: https://discuss.ocaml.org/t/interesting-ocaml-articles/1867/99

Calascibetta Romain announced

Hi, I would like to share my recent article about GADTs and state machines:= GADT= s and state machine

It's another introduction about GADTs and it explains a bit what I did for = robur.io. Eenjoy it and happy hacking!

Logs to a file (a primitive way)

Archive: https://discuss.ocaml.org/t/logs-to-a-file-a-primitive-way/102= 62/1

=F0=9F=8C=8D Marcus Rohrmoser asked

I found https://github.com/oxidiz= ing/sihl/blob/c6786f25424c1b9f40ce656e908bd31515f1cd09/sihl/src/core_log.ml= #L18 and wonder what a primitive way to log to a file would be.

I need to keep stdout clean and not show any log message under= all circumstances.

=F0=9F=8C=8D Marcus Rohrmoser later added

I do a cgi and stdout is the response =E2=80=93 logging has to= go to a separate file. Not even stderr as I want debug logs not to taint the webserver error log in case. And I would like to funn= el logging through Logs.

Yawar Amin suggested and =F0=9F=8C=8D Marcus Rohrmose= r replied

I don't know about logs but it should be relatively easy to ke= ep an open file handle and print log messages there.

https://opam.ocaml.org/pa= ckages/logs/ - I like the loglevel approach. But maybe I will do withou= t and pass around the channel, yes.

Jean Michel suggested

I believe logs support logging to a file via Format. See https://erratique.ch/software/logs/doc/Logs/index.html#val-form= at_reporter

Shon also suggested

I=E2=80=99ve found logs very ergonomic and easy to work with. I tend to pul= l it in via Bos, which has a very nic= e interface to OS interactions. Opening the Bos_setup module also does default logs configuration, and I find all quite painless = and pleasant.

=F0=9F=8C=8D Marcus Rohrmoser said

thanks @yawaramin @beajeanm @shonfeder, I took a middle ground and went along the lines of https://opam.ocaml.org/pa= ckages/logs/ (using the loglevels and logging call style) but base writ= ing almost directly on out_channe= l. (I need a log rotation on top)

I was struggling with lost messages however =E2=80=93 the logfile remained = empty until I flushed after each log message.

Is that known behaviour that writing to a channel (with Printf.fprintf) doesn't necessarily end up in the file? Even when closed quickly.

UnixJunkie replied

You must Printf.printf with "%!" at the end of your format string, to be sure that the log is flushed to file.

That's what I do in dolog: https://github.com/UnixJunk= ie/dolog

Timedesc 0.8.0 - modern date time handling

Archive: https://discuss.ocaml.org/t/ann-timedesc-0-8-0-m= odern-date-time-handling/10138/2

Darren announced

Tiny update: Timedesc 0.9.0 has been released, moving sexplib = dependency into timedesc-sexp and moved from mparser to angstrom for some date time text parse= rs since angstrom is a strict necessity for some binary (de)serialization already.

This overall means Timedesc is about as slim as it can get as a date time h= andling lib, depending only on: seq, angstrom, result, and ptime (p= time is not a strict dependency, but it's nice to have timedesc <= -> ptime convertors).

Florent Monnier asked

Is this a lib that targets to process dates and time in a programmatically = way? (this is what the provided example make me think) Or is it also supposed to be used to print something readable for a user el= se than a programmer?

If there is no end-user goal in this lib, please just ignore my message, an= d sorry to make you lose some time.

In the other case if you consider printing for end users, it's maybe worth = to mention that there is the DateLocale-ocaml m= odule that is available and which provides the name for the months, and days for more than 200 languages. It also provides abbrevia= ted versions for both months and days, which are often used.

The ocaml-community= /calendar was not designed with localisation in mind, it just does String.sub d 0 3 to provide short names, wh= ich will not work with languages that need UTF8.

There is this PR that is still waiting for some review since 2 years to mak= e it compatible with localisation: ocaml-community/calendar/pull/33.

(At least the patch is available there for someone who could be interested.)

I don't know if it could interest some one but I see that the example outpu= ts a list of dates, that look like some kind of logs. In case some one would like to visualise it in a way similar = than the unix command cal you can just create empty files where the file name follows the pattern YYYY-MM-DD like = for example "dir/2022-08-06.txt", you will then be able to visualise it in the console with detri.

Darren replied

Is this a lib that targets to process dates and time in a programmatically = way? (this is what the provided example make me think) Or is it also supposed to be used to print something readable for a user el= se than a programmer?

Development has been primarily focused on former, mostly because solving it= properly was already (very) involved.

Now that Timedesc has stabilised, the latter reads like a very nice next TO= DO to match feature parity of other date time libs.

In the other case if you consider printing for end users, it=E2=80=99s mayb= e worth to mention that there is the DateLocale-ocaml m= odule that is available and which provides the name for the months, and days for more than 200 languages. It also provides abbrevia= ted versions for both months and days, which are often used.

Looks neat! I believe there have been requests of locale sensitive pretty p= rinting/conversion functions, so I definitely would be interested in incorporating your work (if that was the = intention).

I don=E2=80=99t know if it could interest some one but I see that the examp= le outputs a list of dates, that look like some kind of logs. In case some one would like to visualise it in a way similar = than the unix command `cal` you can just create empty files where the file name follows the pattern YYYY-MM-DD like = for example =E2=80=9Cdir/2022-08-06.txt=E2=80=9D, you will then be able to visualise it in the console with detri.

I was interested in something like this for another small utility cmd I've = written, neat!

OCaml website: Owl book not listed

Archive: https://discuss.ocaml.org/t/ocaml-website-owl-book-not-list= ed/10274/1

Andreas Poisel said

It would be nice to add OCaml Scientific Computing to the list on https://ocaml.org/books.

This is a great book and it would be a shame not to promote it. Maybe anyone responsible for the website reads this or can point me in the = right direction.

I'm not in any way affiliated with the authors of this book.

Application-specific Improvements to the Ecosystem

Archive: https://discuss.ocaml.org/t/application-s= pecific-improvements-to-the-ecosystem/10223/49

Deep in this thread, Kay-Uwe Kirstein said

Personally, I often use the monadic Result type together with a polymorphic= variant for the actual errors. This makes dealing with errors from different "levels" of my software (library, comman= d-line tool, and GUI) quite comfortable (and type-safe!). @keleshev has written a nice blog post on this: https://keleshev.com/composable-er= ror-handling-in-ocaml with a recent follow up: https://keleshev.com/advanced-error-handling-in-ocaml

Other OCaml News

From the ocaml.org blog

Here are links from many OCaml blogs aggregated at the ocaml.org blog.

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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