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From: Alan Schmitt <alan.schmitt@polytechnique.org>
To: "lwn" <lwn@lwn.net>, "cwn"  <cwn@lists.idyll.org>, caml-list@inria.fr, comp@lists.orbitalfox.eu
Subject: [Caml-list] Attn: Development Editor, Latest OCaml Weekly News
Date: Tue, 07 Apr 2020 09:51:13 +0200
Message-ID: <87y2r7enta.fsf@polytechnique.org> (raw)

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Hello

Here is the latest OCaml Weekly News, for the week of March 31 to April
07, 2020.

Table of Contents
─────────────────

Making a music player in OCaml
The end of Camlp4
OCamlformat 0.14.0
ML Family Workshop 2020: Call for presentations
Announcing Sek, an efficient implementation of sequences
Announcing dune-deps: produces a project-centric dependency graph
OCaml Users and Developers Meeting 2020
Old CWN


Making a music player in OCaml
══════════════════════════════

  Archive:
  <https://discuss.ocaml.org/t/making-a-music-player-in-ocaml/5413/1>


Dracose asked
─────────────

  I'm interested in making my own music player in OCaml so I wanted to
  know whether there were any existing ones and/or examples of how to
  make one. Bear in mind, I am interested in the actual logic of how to
  read a music file (or a playlist) and listening to it, rather than the
  front-end part of a music player.  (My knowledge of OCaml is
  intermediate)


Thomas Blanc suggested
──────────────────────

  You want to check <https://github.com/savonet/liquidsoap>


Yotam Barnoy then said
──────────────────────

  Wow @PatJ I didn't know about liquidsoap. I added it to
  ocamlverse. This is what we have for the audio page now, in case it's
  helpful to the OP: <https://ocamlverse.github.io/content/audio.html>


gndl also replied
─────────────────

  I experimented with several solutions in the [playo] project.  One of
  the possible solutions is to use [ocaml-gstreamer].  If you find that
  the gstreamer framework is too annoying (which I can understand :-),
  you can use [ocaml-ffmpeg]. note however that, in the latest version
  of ocaml-ffmpeg, the audio device output [no longer works]. To
  overcome this drawback, you can use [ocaml-portaudio].


[playo] <https://github.com/gndl/playo>

[ocaml-gstreamer] <https://github.com/savonet/ocaml-gstreamer>

[ocaml-ffmpeg] <https://github.com/savonet/ocaml-ffmpeg>

[no longer works] <https://github.com/savonet/ocaml-ffmpeg/issues/32>

[ocaml-portaudio] <https://github.com/savonet/ocaml-portaudio>


The end of Camlp4
═════════════════

  Archive: <https://discuss.ocaml.org/t/the-end-of-camlp4/4216/96>


Continuing this old thread, Chet Murthy announced
─────────────────────────────────────────────────

  Perhaps worth mentioning briefly that for anybody who -wants- to
  continue using camlp4, I'm (a) maintaining camlp5 and bringing it
  up-to-date with everything in ocaml 4.10.0 that I can think of, and
  (b) I'd be happy to help them port their dependency over to camlp5.

  This is not to be construed as an argument for using camlp4/5.


OCamlformat 0.14.0
══════════════════

  Archive: <https://discuss.ocaml.org/t/ann-ocamlformat-0-14-0/5435/1>


Etienne Millon announced
────────────────────────

  On behalf of the development team, I'd like to announce the release of
  ocamlformat version 0.14.0 :tada:.

  Here are the main highlights of this release:


Support for OCaml 4.10
╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌

  This means both that it compiles and runs using this version, but also
  that it can format 4.10-specific language features (`module _' and
  multi-indices operators).


Preliminary support for invalid files
╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌

  As OCamlformat operates on ASTs, it normally requires a valid input
  file. This release adds a `--format-invalid-files' option to detect
  invalid parts and print them verbatim. This feature is still
  experimental.


Preserving more concrete syntax
╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌

  Starting with this release, OCamlformat is going to preserve more
  concrete syntax. For example, `module M = functor (K : S) -> struct
  end' and `module M (K : S) = struct end' are equivalent. In the past,
  both variants would be formatted as the latter. Now, the original
  syntax is preserved. In some cases, preserving was possible through
  the means of an option: for example, to choice between `let%name x = e
  in body' and `[%name let x = e in body]', was controlled by the
  `extension-sugar' option. This option is now deprecated and
  OCamlformat will now always preserve what was in the source file (this
  was the default behaviour).

  Similarly, it was possible to control how special characters are
  escaped in string and character literals through the `escape-strings'
  and `escape-chars' options. They are being deprecated and the only
  possible behavior will be preserving the concrete syntax (as done by
  default).

  The reason for this change is that we feel that ocamlformat should be
  just about formatting. The fact that this behavior was configurable is
  in part due to the fact that it operates on OCaml ASTs, but end users
  should not have to be surprised by their code being transformed on
  reformatting.

  In the future, we plan to extend that to other similar constructs,
  such as using `(~/')~ or `begin~/~end', or spacing between module
  items.


Placement of doc comments
╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌

  Placing doc comments `(** ... *)' is controlled by the `doc-comments'
  configuration option. It is always possible to put them before the
  item they refer to, and this is what the `doc-comments=before' option
  does. The alternative `doc-comments=after' will try to do its best to
  put them after, but in some cases it is not possible. For example, in
  a variant type declaration, a doc-comment put immediately after will
  be attached to the last constructor by documentation
  tools. Ocamlformat needs to preserve the meaning of programs, so in
  these cases, it will instead put the comment before. In the case of
  `module' declarations, putting the comment after might not be very
  useful if the corresponding module is very large.

  This requires a complex rule to determine which comments will be put
  before and which comments will be put after. So in this version, we
  are deprecating this mechanism and replacing it with a simpler one
  controlled by `doc-comments-val' that applies only to `val' and
  `external' items. For these items, it is always possible to attach
  documents before or after them. For all other items, like type or
  module declarations, the doc comments will consistenly be put before.


Many bugs found by fuzzing
╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌

  We hooked ocamlformat to AFL, looking for programs that parse
  correctly but trigger errors during formatting. This approach worked
  very well and more than 20 logical bugs were found with this
  technique.


Upgrading
╌╌╌╌╌╌╌╌╌

  To upgrade from ocamlformat 0.13.0, one needs to upgrade the
  ocamlformat binary and replace the `version' field in `.ocamlformat'
  files by `0.14.0' and then:

  • if you used `doc-comments=after', you can replace it by
    `doc-comments-val=after'.  This will move doc-comments on module
    items except `val' and `external' ones.
  • if you used `doc-comments=before', you can remove it as it is now
    the default.
  • if you set `escape-chars=preserve', `escape-strings=preserve', or
    `extension-sugar=preserve' explicitly, you can
  remove them safely (they were the default)
  • if you used another value for one of these options (such as
    `escape-strings=hexadecimal'), you will need to remove them as
    well. This will not trigger a diff, but ocamlformat will not enforce
    a particular concrete syntax for new code.


A note for new users
╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌

  We encourage you to try ocamlformat, that can be installed from opam
  directly (`opam install ocamlformat'), but please remember that it is
  still beta software. We added a [FAQ for new users] that should help
  you decide if ocamlformat is the right choice for you.


[FAQ for new users]
<https://github.com/ocaml-ppx/ocamlformat#faq-for-new-users>


Etienne Millon later added
──────────────────────────

  This upgrade is likely to generate a huge diff on projects that use
  the default profile, so I would like to expand a bit on the reason.

  According to [the syntax rules used by the ocaml tools] (the ocaml
  compilers, ocamldoc, odoc), it is always possible to put the
  doc-comment before an item.

  Some teams prefer to put the documentation after. But that is not
  always possible. For example, `type t = A | B (** doc *)' will attach
  the doc-comment to `B', not to `t'. The only way to attach the comment
  to `t' is by putting the comment before.

  Enter ocamlformat: doc-comment placement is controlled by an option
  with two values, `before' or `after'. `before' will always place the
  comment before. `after' determines if it is possible to put the
  comment after, and if it is not, will put it before.

  Some items cannot have comments after, like variant types (as
  described above). But there is another reason not to put comments
  after. In some cases, that can put the comment far from the thing it
  is documenting. Considering modules, the following is nice:

  ┌────
  │ module M = L.M
  │ (** doc *)
  └────

  But this is not great is the structure is large:

  ┌────
  │ module M = struct
  │   ...
  │   ...
  │ end
  │ (** doc *)
  └────

  To summarize, when ocamlformat is configured to put comments after, it
  has to follow a complex heuristic to determine whether it has to
  fallback to before. In the case of a module, it depends on its shape,
  how many functor arguments are there, this kind of things (for various
  reasons, we don't know how large something is going to be in advance,
  so we have to look at its shape). The point is that it is complicated
  to understand and explain, and that fixing it always makes it more
  complex. Another aspect is that in the end, we want ocamlformat to be
  pretty stable when it reaches 1.0.0, and complex rules are at odds
  with this goal.

  So, we have decided to simplify the rule: instead of looking deep in
  the AST, we just look at the kind of item this is. For `val' and
  `external' items, it is always possible to put the doc-comment after,
  so we follow exactly what the configuration option says.

  As a user of the default profile, what this means for you: for items
  that are not `val' or `external', and considered "simple" by the
  0.13.0 heuristic, doc-comments are going to move from after to before.

  Based on these reasons, you will understand that `before' is always
  simpler. You can opt into this by setting
  `doc-comments-val=before'. This will cause an even larger diff as all
  items are going to move before (that is: all items described just
  above, plus `val' and `external' items), but the rule gets extremely
  simple (everything is put before). It is possible that this option
  will become the default in the future, but we have not decided this
  yet (in this case, if you did not opt into it, you will see comments
  on `val' and `external' items move at that time).


[the syntax rules used by the ocaml tools]
<https://caml.inria.fr/pub/docs/manual-ocaml/ocamldoc.html#ss:ocamldoc-placement>


ML Family Workshop 2020: Call for presentations
═══════════════════════════════════════════════

  Archive:
  <https://discuss.ocaml.org/t/ml-family-workshop-2020-call-for-presentations/5441/1>


Leo White announced
───────────────────

  We are happy to invite submissions to the ML Family Workshop 2020, to
  be held during the ICFP conference week on Thursday, August 27th.

  The ML family workshop warmly welcomes submission touching on the
  programming languages traditionally seen as part of the "ML family"
  (Standard ML, OCaml, F#, CakeML, SML#, Manticore, MetaOCaml,
  etc.). The scope of the workshop includes all aspects of the design,
  semantics, theory, application, implementation, and teaching of the
  members of the ML family. We also encourage presentations from related
  languages (such as Haskell, Scala, Rust, Nemerle, Links, Koka, F*,
  Eff, ATS, etc), to exchange experience of further developing ML ideas.

  Currently, the workshop is still scheduled to go ahead as planned in
  Jersey City, however it is likely that the ML workshop will end up
  being a virtual workshop this year. Either way provisions will be made
  to allow speakers to present their work remotely.

  See our detailed CFP online on the ICFP website:

  <https://icfp20.sigplan.org/home/mlfamilyworkshop-2020>


Important dates
╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌

  • Friday 15th May (any time zone): Abstract submission deadline
  • Friday 26th June: Author notification
  • Thursday 27th August: ML Family Workshop


Program committee
╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌

  • Youyou Cong (Tokyo Institute of Technology)
  • Gowtham Kaki (Purdue University)
  • Neel Krishnaswami (University of Cambridge)
  • Daan Leijen (Microsoft Research)
  • Koko Muroya (Kyoto University)
  • Atsushi Ohori (Tohoku University)
  • Jonathan Protzenko (Microsoft Research)
  • Gabriel Radanne (INRIA)
  • Claudio Russo (Dfinity)
  • Leo White (Jane Street) (Chair)
  • Jeremy Yallop (University of Cambridge)


Submission details
╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌

  See the online CFP for the details on the expected submission format.

  Submissions must be uploaded to the workshop submission website

  <https://ml2020.hotcrp.com/>

  before the submission deadline.


Announcing Sek, an efficient implementation of sequences
════════════════════════════════════════════════════════

  Archive:
  <https://discuss.ocaml.org/t/announcing-sek-an-efficient-implementation-of-sequences/5442/1>


François Pottier announced
──────────────────────────

  We are pleased to announce the first release of Sek, an OCaml library
  that offers an efficient implementation of sequences.

  The library offers both ephemeral (mutable) sequences and persistent
  (immutable) sequences, and offers constant-time conversions between
  these flavors.

  It supports all of the standard operations on stacks, queues, deques
  (e.g.  push, pop at either end), catenable sequences (concat, split),
  and random access sequences (get, set).

  Data is stored internally in chunks (fixed-capacity arrays), which is
  why this data structure is known as a chunK SEquence.

  It is intended to achieve excellent time complexity and memory usage.

  This is an initial release. The library has not been tested in
  production, but has received extensive unit testing, via afl-fuzz and
  ocaml+afl – which are remarkably effective tools, by the way!

  This is work in progress; more features, such as iterators, will be
  added in the future.

  To install Sek, just type

  ┌────
  │ opam update && opam install sek
  └────

  Documentation is [online].

  Feedback is welcome!

  Arthur Charguéraud
  François Pottier
  with contributions by Émilie Guermeur


[online] <http://cambium.inria.fr/~fpottier/sek/doc/sek/Sek/index.html>


Yaron Minsky asked and Fabian replied
─────────────────────────────────────

        I’m particularly interested in how it compares to
        Base.Sequence and Seq in the OCaml distribution, but
        surely there are others as well.

  This actually looks like an array/vector structure (supporting, among
  other things, fast access to the nth element), so a comparison with
  `CCVector', `CCFun_vec', `BatVect', `Clarity.Vector' etc. would be
  more appropriate. The name is a bit unfortunate considering the naming
  used in the general ecosystem.

  Some time ago, I added some crude benchmarks to [containers'
  benchsuite].  I'll see if I can add Sek when I find time.


[containers' benchsuite]
<https://github.com/c-cube/ocaml-containers/blob/d34b7588b028f3618cc44d3f4c6417295db586c8/benchs/run_benchs.ml#L112>


gasche said
───────────

  I think it really is a sequence library in the sense that in maintains
  an in-order sequence of items, and sequences can be joined/split
  efficiently. It also provides logarithmic random access, but this is
  probably not competitive with fixed-size arrays. It would be
  comparable to "persistent vector" libraries, ropes, finger trees,
  etc. The fact that the authors expose a Stack/Queue interface suggests
  that it has also been tuned to perform reasonably well in this case.

  It does not provide any delayed computation of items, so in that
  regard it is not comparable to Sequence/Seq.

  @charguer has designed similar datastructures in the past to represent
  the work-queues of concurrent workers (you want at least a fast "push"
  to add a new task and, when doing work-stealing, having a fast "split"
  is convenient). See [Theory and Practice of Chunked Sequences], Umut
  Acar, Arthur Charguéraud, Mike Rainey, 2014, and [A Work-Efficient
  Algorithm for Parallel Unordered Depth-First Search].

  As far as I know, the OCaml implementation just released has not been
  tested/benchmarked for parallel algorithms. I would be curious to see
  an experiment of parallel graph traversal with this structure and
  Multicore-OCaml.


[Theory and Practice of Chunked Sequences]
<https://www.chargueraud.org/research/2014/chunkedseq/chunkedseq.pdf>

[A Work-Efficient Algorithm for Parallel Unordered Depth-First Search]
<https://www.chargueraud.org/research/2015/pdfs/pdfs_sc15.pdf>


Announcing dune-deps: produces a project-centric dependency graph
═════════════════════════════════════════════════════════════════

  Archive:
  <https://discuss.ocaml.org/t/announcing-dune-deps-produces-a-project-centric-dependency-graph/5451/1>


Martin Jambon announced
───────────────────────

  I'm happy to announce the availability of [dune-deps], a command-line
  tool that scans a dune project and gathers the dependencies into a
  graph. The output is in the dot format, supported by the `dot' command
  from [graphviz].

  It shows the dependencies between the following:

  • libraries defined by the project,
  • executables defined by the project,
  • direct dependencies on external libraries.

  Dependencies are extracted by parsing `dune' files. As an example,
  here's what we obtain for the [sources of opam], which has over 50K
  lines of code:

  <https://aws1.discourse-cdn.com/standard11/uploads/ocaml/original/2X/f/f6213fa7fda52521c6782988155ab23b997dafb8.png>

  The commands for this are:
  ┌────
  │ # obtain the project's sources
  │ $ git clone --depth=1 https://github.com/ocaml/opam.git
  │
  │ # extract dependencies and eliminate superfluous graph edges
  │ $ dune-deps opam | tred > deps.dot
  │
  │ # render the graph
  │ $ dot -Tpng deps.dot -o deps.png
  └────

  A suggestion is to include such graph in your project's `README.md'.


[dune-deps] <https://github.com/mjambon/dune-deps>

[graphviz] <https://www.graphviz.org/>

[sources of opam] <https://github.com/ocaml/opam>


OCaml Users and Developers Meeting 2020
═══════════════════════════════════════

  Archive:
  <https://discuss.ocaml.org/t/ocaml-users-and-developers-meeting-2020/5454/1>


Ivan Gotovchits announced
─────────────────────────

  It is my pleasure to invite submissions to the OCaml Users and
  Developers Workshop 2020, which is again co-located with ICFP and will
  be held on Friday 28th August 2020 in Jersey City, NJ, USA.

  The OCaml Users and Developers Workshop brings together the OCaml
  community, including users of OCaml in industry, academia, hobbyists
  and the free software community. Previous editions have been
  co-located with ICFP since 2012 in Copenhagen, Boston, Gothenburg,
  Nara, Oxford, St Louis and last year in Berlin, following OCaml
  Meetings in Paris in 2010 and 2011.


Important Links
╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌

  • <https://ocaml.org/meetings/ocaml/2020/>
  • <https://icfp20.sigplan.org/home/ocaml-2020>
  • <https://ocaml2020.hotcrp.com/>


Important Dates
╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌

  • Talk proposal submission deadline: May 8th, 2020, AoE
  • Author Notification: June 26th, 2020
  • OCaml Workshop: August 28th, 2020


Scope
╌╌╌╌╌

  Presentations and discussions focus on the OCaml programming language
  and its community. We aim to solicit talks on all aspects related to
  improving the use or development of the language and its programming
  environment, including, for example (but not limited to):

  • compiler developments, new backends, runtime and architectures

  • practical type system improvements, such as GADTs, first-class
    modules, generic programming, or dependent types

  • new library or application releases, and their design rationales

  • tools and infrastructure services, and their enhancements

  • prominent industrial or experimental uses of OCaml, or deployments
    in unusual situations.


Presentations
╌╌╌╌╌╌╌╌╌╌╌╌╌

  The workshop is an informal meeting with no formal proceedings. The
  presentation material will be available online from the workshop
  homepage. The presentations may be recorded and made available at a
  later date.

  The main presentation format is a workshop talk, traditionally around
  20 minutes in length, plus question time, but we also have a poster
  session during the workshop – this allows to present more diverse
  work, and gives time for discussion. The program committee will decide
  which presentations should be delivered as posters or talks.


Submission
╌╌╌╌╌╌╌╌╌╌

  To submit a presentation, please register a description of the talk
  (about 2 pages long) at

  <https://ocaml2020.hotcrp.com/>

  providing a clear statement of what will be provided by the
  presentation: the problems that are addressed, the solutions or
  methods that are proposed.

  LaTeX-produced PDFs are a common and welcome submission format. For
  accessibility purposes, we ask PDF submitters to also provide the
  sources of their submission in a textual format, such as .tex
  sources. Reviewers may read either the submitted PDF or the text
  version.


ML family workshop
╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌

  The ML family workshop, held on the previous day, deals with general
  issues of the ML-style programming and type systems, focuses on more
  research-oriented work that is less specific to a language in
  particular. There is an overlap between the two workshops, and we have
  occasionally transferred presentations from one to the other in the
  past. Authors who feel their submission fits both workshops are
  encouraged to mention it at submission time and/or contact the Program
  Chairs.


Program Committee
╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌

  • Ivan Gotovchits, CMU, USA
  • Florian Angeletti, INRIA, France
  • Chris Casinghino, Draper Laboratory, USA
  • Catherine Gasnier, Facebook, USA
  • Rudi Grinberg, OCaml Labs, UK
  • Oleg Kiselyov, Tohoku University, Japan
  • Andreas Rossberg, Dfinity Stiftung, Germany
  • Marcello Seri, University of Groningen, Netherlands
  • Edwin Torok, Citrix, UK
  • Leo White, Jane Street, USA
  • Greta Yorsh, Jane Street, USA
  • Sarah Zennou, Airbus, France


COVID-19 Notice
╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌

  While ICFP-20 [is still scheduled to be held as planned], chances are
  high that it will be turned into a virtual conference. Which means a
  wider audience and reduced (hopefully) fees. We will keep you posted.


[is still scheduled to be held as planned]
<https://icfp20.sigplan.org/home/icfp-2020>


Questions and contact
╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌

  Please send any questions to the chair: Ivan Gotovchits (ivg@ieee.org)


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
  [online].

  [Alan Schmitt]


[send me a message] <mailto:alan.schmitt@polytechnique.org>

[the archive] <http://alan.petitepomme.net/cwn/>

[RSS feed of the archives] <http://alan.petitepomme.net/cwn/cwn.rss>

[online] <http://lists.idyll.org/listinfo/caml-news-weekly/>

[Alan Schmitt] <http://alan.petitepomme.net/>


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