Hello Here is the latest OCaml Weekly News, for the week of August 05 to 12, 2025. Table of Contents ───────────────── Slipshow! Miou, a simple scheduler for OCaml 5 Dream development open video call Other OCaml News Old CWN Slipshow! ═════════ Archive: Paul-Elliot announced ───────────────────── It is with some /bitter/ joy that I’m announcing the 0.4.1 version of Slipshow [on opam]: [on opam] The slides strike back ╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌ The main improvements of this version are the introduction of arguments to actions, a frontmatter, and improvements to slides. All together, they allow to easily design presentations the slides way: ┌──── │ --- │ toplevel-attributes: {children:slide children:enter="~duration:0"} │ --- │ │ # Slide 1 │ │ Content │ │ --- │ │ # Slide 2 │ │ Content │ │ --- │ │ # Slide 3 │ │ You get it └──── So, why “​/bitter/ joy”? I was reluctant to add good support for traditional slide-based presentation. There are already very good and mature solutions for this, including some with similar technical foundations as Slipshow. I was more interested in developping the new things: Slips! However, Slipshow starts to have useful features that competitor don’t always have (for instance: a self-contained html output! But more, and more to come). Also, for people who already have slide-based presentations, it makes it easier to migrate them, and use a single tool for old and new presentations! Finally, I wanted to make Slipshow a bit more versatile and added attributes, frontmatter, and a new options: `toplevel-attributes'. The proper slide support is actually just a nice consequence of this versatility! 🥳 Here is the full changelog: • Fix `children:' not working sometimes • Add `--toplevel-attributes' to control the attributes on the toplevel container • Render slide titles as slide titles • Add arguments to actions • Add frontmatter You can now do ┌──── │ --- │ theme: vanier │ dimension: 16:9 │ css: my_pres.css │ --- │ │ The content here. └──── OCaml-specific notes on action arguments ╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌ In this release, I add the ability to give arguments to actions. For instance, an action can be to focus on a specific element: ┌──── │ {#my_element} │ Some content │ │ {focus="my_element"} └──── The "positional" arguments is the list of IDs that must be focused. To add other kind of arguments , they need to be named: ┌──── │ {#my_element} │ Some content │ │ {focus="~duration:2 ~margin:5 my_element"} └──── It was fun to integrate OCaml syntax in slipshow ;) This way, people coming to OCaml after learning slipshow will feel familiar with the syntax! Paul-Elliot later announced ─────────────────────────── The Slipshow development intensifies… It is with external pleasure that I announce the [0.5.0] release of slipshow [on opam]. Warning: External files have invaded our world! They raise dead formats like PDF into the liveliness of Slipshow presentations! [0.5.0] [on opam] Slipshow 0.5.0: Plan 9 from External Files ╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌ As subtly hinted by the title, this slipshow release focuses on the integration of external files in a presentation. Rest assured, a compiled Slipshow presentation stays a standalone HTML file! In effect, you can now include PDFs, videos and audios files in your presentations! Here is a demo: With the simple source: ┌──── │ {#title} │ # Plan 9 from External Files │ │ {pause play-media=mp4} │ ## Video demo │ │ ![](plan9.mp4){#mp4 style="width:100%"} │ │ {pause up} │ │ ## PDF demo │ │ ![](plan9.pdf){#pdf} │ │ {focus=pdf} │ │ {change-page="~n:all pdf"} │ │ {unfocus up=title} └──── Here is the full changelog: ◊ Compiler • Add support for pdfs • Add support for audios and videos • Fix `enter' action being added to blockquotes ◊ Language • Add a carousel type and a `change-page' action • Add a `play-media' action ◊ Engine • Fix compatibility of slipshow and editable content • Fix scroll bar appearing in drawing toolbox Miou, a simple scheduler for OCaml 5 ════════════════════════════════════ Archive: Calascibetta Romain announced ───────────────────────────── I am pleased to announce the release of [miou.0.4.0], the documentation was just updated [here] and the book to learn about Miou is still available [here]. This version mainly consolidates our experiments with other libraries, notably: [`ocaml-dns'], [`happy-eyeballs'], [`mirage-crypto'], [`ocaml-tls'], [`httpcats'], [`carton'], [`sendmail'] and [`caqti']. This consolidation of the API allows us to go further and, in particular, to start offering the [development of unikernels with OCaml 5]. To this end, you can follow projects such as [miou-solo5] or [chaos]. An overview is available [on my blog] (which presents the latest Mirage retreat in May). We would also like to continue improving [Vif] and [Hurl] ([a tutorial] has just been published on this subject). Other projects are still in the experimental phase, such as: [`notty' / `nottui'], [`blaze'], [`multipart_form'] or [`awa-ssh']. Finally, we would like to thank everyone who has participated directly or indirectly in this project and to its integration into the OCaml ecosystem. Happy hacking! [miou.0.4.0] [here] [here] [`ocaml-dns'] [`happy-eyeballs'] [`mirage-crypto'] [`ocaml-tls'] [`httpcats'] [`carton'] [`sendmail'] [`caqti'] [development of unikernels with OCaml 5] [miou-solo5] [chaos] [on my blog] [Vif] [Hurl] [a tutorial] [`notty' / `nottui'] [`blaze'] [`multipart_form'] [`awa-ssh'] Dream development open video call ═════════════════════════════════ Archive: Continuing this thread, Anton Bachin announced ────────────────────────────────────────────── For those interested in minutes/notes, providing a brief summary :slight_smile: We had a chat about how to maintain Dream as a community, added several people to the repo (master branch is locked for security), and worked through what we can do immediately on several PRs. I showed how I maintain Dream on those PRs, and several others contributed their thoughts and ideas. At the end we talked off-topic a bit about the future of Dream and bigger projects in it and around it to tackle. It’s difficult to write out minutes as it was a lot of detailed talk and work – adding specific people, dealing with specific issues. One can see the recent activity in the [Dream repo] to see our guinea pig PRs :slight_smile: [Dream repo] Anton Bachin later added ──────────────────────── We’re going to have the next dev meeting this coming Friday, and weekly thereafter. Other OCaml News ════════════════ >From the ocaml.org blog ─────────────────────── Here are links from many OCaml blogs aggregated at [the ocaml.org blog]. • [Upcoming OCaml Events] • [Irmin Retrospective] [the ocaml.org blog] [Upcoming OCaml Events] [Irmin Retrospective] 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 look at [the archive] or the [RSS feed of the archives]. If you also wish to receive it every week by mail, you may subscribe to the [caml-list]. [Alan Schmitt] [send me a message] [the archive] [RSS feed of the archives] [caml-list] [Alan Schmitt]