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inline Content-Transfer-Encoding: quoted-printable OCaml Weekly News

OCaml Weekly News

Previous Week<= /a> Up Next Week

Hello

Here is the latest OCaml Weekly News, for the week of January 28 to Februar= y 04, 2025.

Opam repository archive - clarification of the opam fields

Archive: https://discuss.ocaml.org/t/opam-rep= ository-archive-clarification-of-the-opam-fields/16050/1

Hannes Mehnert announced

Dear everyone,

we had further discussions about the semantics of x-maintenance-inten= t, and hope to clarify in this post. Also, we adapted the policy whi= ch is in the opam-repository git repository: https:/= /github.com/ocaml/opam-repository/blob/master/governance/policies/archiving= .md

x-maintenance-intent

We've had some further discussions on Phase 3 and the semantics of the x-maintenance-intent field.

  • Goal

    Our aim is to be not disruptive for the common OCaml programmer or user. Th= e opam-repository supports (from February 1st on) OCaml 4.08 and greater. T= his means that if you install OCaml 4.08 you should be able to install all = the packages that have ever been released with 4.08 support.

    The revised semantics of "(latest)" is "the latest version of this package,= so that every supported OCaml version will have an installation candidate".

    • Example

      Let me give you an example, consider the package "basic" which exists in th= ree versions:

      • basic.1.0.0 with the dependency "ocaml" {>=3D "4.05" & < "5"}=
      • basic.1.0.1 with the dependency "ocaml" {>=3D "4.08" & < "5"}=
      • basic.2.0.0 with the dependency "ocaml" {>=3D "4.14" & < "5"}=

      Here, if the x-maintenance-intent: [ "(latest)" ] is present, = we will only (try to) archive basic.1.0.0 – since 1.0.1 is needed fo= r OCaml 4.08 .. 4.13.

  • Default value

    The default value of x-maintenance-intent will for now be "(any)" - so all versions are kept. In the future, we may change t= his default to "(latest)", but will announce this ahead of the= change with plenty of time.

    This default value is agreed on by the non-disruptive agreement to cause th= e least trouble.

x-maintained

In addition to the x-maintenance-intent - which covers the sem= antics of all versions of an opam package, we support another field, = x-maintained: BOOL. This is an overwrite for a specific opam package= version, and allows to declare whether it is maintained or not.

It is useful in the setting where you've lots of pre-releases that are no l= onger maintained and you like to state this without writing a global intent= for the opam package (e.g. for the OCaml compiler packages, the alpha, bet= a, and rc versions). Here, x-maintained: false is a nice setti= ng. NB: earlier we proposed flags: deprecated - but we stay aw= ay from the flags, since there may be packages that are deprecated but stil= l maintained (opam prints a warning if you install a package with the depre= cated flag).

If you have a private project and depend on a specific version of an opam p= ackage, you can as well PR the x-maintained: true field for th= at opam file (please specify when, who, and why). This will ensure that thi= s opam file stays in the opam repository.

Phase 3

In Phase 3, we will consider all packages marked with x-maintenance-i= ntent (the versions not matching the intent) and x-maintained:= false to be archived.

We plan to ensure that (a) all supported OCaml versions will retain an inst= allation candidate (b) all reverse dependencies will still be installable. = As a note, if you have an availability condition (some version will only wo= rk on some OS), we won't take that into consideration – you will nee= d to specify the x-maintenance-intent to cover your versions.

Our plan is to publish the list of packages to be archived by February 15th= on this discourse. It is likely we'll have candidate lists PRed to the opam-repository-a= rchive earlier. We have lots of ideas and plans for CI systems to give = feedback which opam versions are falling into the maintenance intent when y= ou open a PR to the opam-repository (but we're not there yet).

Future

As noted above, the default value of x-maintenance-intent may = change in time. If this is decided, we will announce this with plenty of ti= me before.

Also, at some point in the future we will bump the OCaml lower bound (from = February 1st it is 4.08).

Action

For the smooth shrinking of the opam-repository, please don't hesitate to f= ill in your x-maintenance-intent (especially "(none)" and "(latest)" are fi= ne and safe choices).

If you want to contribute more, the opam-repository needs help for triaging= and merging PRs - why not become a maintainer? See the old but still valid= 'call for new opam-repository maintainers' if you're inter= ested.

Ch=C3=BAc m=E1=BB=ABng n=C4=83m m=E1=BB=9Bi =E1=BA=A4t T=E1=BB= =B5 2025!

Archive: https://discuss.ocaml.org/t/chuc-m-ng-nam-m-i-t-t-2025/16055/1

sanette announced

Happy Vietnamese (and Chinese too) New Year!

It's the year of the snake, no its has nothing to do with python, but why not play Sn=C3=B3k= e ;)

Happy OCaml snaky year to all

3D"724=

Rewriting Slipshow in OCaml: The undo-able monad

Archive: https://discuss.ocaml.org/t/blog-rewriti= ng-slipshow-in-ocaml-the-undo-able-monad/16069/1

Paul-Elliot announced

Hello OCamlers,

I have recently rewritten Slipshow's engine from JavaScript to OCaml. It turns out this rewriting was very satisfying, and many niceties came out= of it. I have written a blog post about a specifically interesting one: the use of= custom let operators with the "undo-able" monad. I hope you e= njoy the read!

The blog post: How I fix= ed Slipshow's worst flaw using OCaml and a monad.

Announcing climate.0.4.0

Archive: https://discuss.ocaml.org/t/announcing-climate-0-4-0/16084/1

Steve Sherratt announced

Climate is a declarativ= e command-line parser for OCaml. This release is mostly focused on improvin= g --help messages and allowing the colours of help messages to= be configured.

Added

  • Allow help messages colours to be configured (#7)
  • Proof of concept of manpage generation (disabled in release as it's ver= y incomplete) (#11<= /a>)

Fixes

  • Remove superfluous style reset escape sequences (#7)
  • Don't apply formatting to trailing spaces in argument names in help mes= sages (#8)
  • Print a readable error when the argument spec is invalid (#10)

15th MirageOS retreat May 13th - 20th

Archive: https://discuss.ocaml.org/t/ann-15th-mirageos-retreat= -may-13th-20th/16085/1

Hannes Mehnert announced

Dear everybody,

we'll have another MirageOS retreat in May 2025 (13th - 20th). Happy to see= lots of old and new faces there.

Please jump to https://retreat.mir= ageos.org for further details, and sign up and spread the word :)

Don't hesitate to ask questions in this topic.

Dune dev meeting

Archive: https://discuss.ocaml.org/t/ann-dune-dev-meeting/14994/22

Etienne Marais announced

Hi Dune enthusiasts :smile:,

We will hold the regular Dune Dev Meeting on Wednesday, February, 5th= at 9:00 CET. As usual, the session will be one hour long.

Whether you are a maintainer, a regular contributor, a new joiner or just c= urious, you are welcome to join: these discussions are opened! The goal of = these meetings is to provide a place to discuss the ongoing work together a= nd synchronize with the Dune developers! :ok_hand:=20

:calendar: Agenda

The agenda is available on the meeting dedicated page. Feel free to ask if y= ou want to add more items in it.

:computer: Links

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 to the= caml-list.

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