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

OCaml Weekly News

Previous Week Up Next Week

Hello

Here is the latest OCaml Weekly News, for the week of April 28 to May 05, 2= 020.

Lwt now has let* syntax

Archive: https://discuss.ocaml.org/t/lwt-now-has-let-syntax/5651/1

Anton Bachin announced

Lwt now has let* and let+ syntax, which can be used like this: 

open Lwt.Syntax

let () =3D
  let request =3D
    let* addresses =3D "google.com"<=
/span> "80" [] in
    let google =3D Lw=
t_unix.((List.hd addresses).a=
i_addr) in

    Lwt_io.(with_connection google (=
fun (incoming, outgoing) ->
      let* () =3D=
 write outgoing "GET / HTTP/1.1\r\n"=
 in
      let* () =3D=
 write outgoing "Connection: close\r\n\r\n"=
 in
      let* response =3D read incoming in
      Lwt.return (Some response)))
  in

  let timeout =3D
    let* () =3D <=
span style=3D"color: #228b22;">Lwt_unix.sleep 5. in
    Lwt.return None
  in

  match Lwt_main.run (Lwt.pick [r=
equest; timeout]) with
  | Some =
response -> print_string response
  | None =
-> prerr_endline "Request timed out"; exit 1

This is now released in Lwt 5.3.0. Thanks to Rahul Kumar for adding let*, and @CraigFe for adding let+!

Thomas Coopman asked

Awesome this looks great.

2 quick questions:

  1. I don't see this new version documented on ocsigen yet? Is that a build= that needs to be done manually?
  2. Is ppx_lwt still recommend for some usecases like tr= y%? For what cases is one preferred over the other?

Anton Bachin replied

Good questions :slight_smile:

  1. The docs generation is blocked on an Ocsigen "internal" package w= ikidoc, which has not been updated to support 4.08. So, effectively,= let* is exactly what is preventing docs generation for the ti= me being. I'll post the docs as soon as that is fixed.
  2. ppx_lwt is probably still the recommended way, because of = better backtraces, and things like try%lwt. let* = is nice for people that don't want to use the PPX. They can still benefit f= rom a monadic syntax.

JOSE 0.3.0 - Now with 100% more encry= ption

Archive: https://discuss.ocaml.org/t/ann-jose-0-3-0-now-wit= h-100-more-encryption/5667/1

Ulrik Strid announced

I recently released a version 0.3.0 of JOSE.

https://github.com/ul= rikstrid/reason-jose
https://ulrikstrid.git= hub.io/reason-jose

It now includes some of the JWE (JSON Web Encryption) spec. A huge thank yo= u goes out to @hannes for helping me implementing one of the gnarlier combinations of decryption that I could th= en use as a base for encryption and more alg and enc.

I also refactored the JWK (JSON Web Keys) implementation to unify and simpl= ify the representation. It is now possible to use a private key for anything a public key can do since it's a superset.

A special thanks to @anmonteiro for helping me with the design and reviewin= g my code.

Are there learning materials for OCam= l for those with no programming experience?

Archive: https://discus= s.ocaml.org/t/are-there-learning-materials-for-ocaml-for-those-with-no-prog= ramming-experience/5684/1

Aaron Christianson asked

OCaml is a language with some advanced features, but a very gentle learning= curve. It seems like it would be well-suited to teaching beginners to program (a few tricky error messages n= otwithstanding), but I haven't seen many resources targeted at teaching programming from scratch. Does anyone here k= now any?

Daniel B=C3=BCnzli replied

There is OCaml from the Very Beginnin= g written by @JohnWhitington.

Nicol=C3=A1s Ojeda B=C3=A4r also replied

An excellent (free) book is "LE LANGAGE CAML" https://caml.inria.fr/pub/distrib/books/llc.= pdf.

Pierre also replied

There's also = CS3110 from Cornell University. Here's the textbook. It's pretty great!

The recent evolution of utop, lambda-= term, zed and underneath projects

Archive: https://discuss.ocaml.org= /t/the-recent-evolution-of-utop-lambda-term-zed-and-underneath-projects/568= 7/1

ZAN DoYe announced

Hi, dear OCaml guys! We've been keeping quiet for more than one year though= utop, lambda-term, zed and some related projects were still evolving durin= g the period of time. This is because of two reasons:

  1. The new feature had nothing to do with the fields where most OCaml develope= rs are working on:

    3D"a30d5fb6fc07=

    3D"91b88f0c4927=

    Recognizing, editing, fuzzy searching for Character Variation(mainly for an= cient CJK characters).

    Nevertheless, the new feature brought us a good side effect =E2=80=93 the l= ong-existing Issue with asian charset was resolved. UTop users will notice the= refinement naturally, so no announcement was needed.

  2. I didn't deem the first few new editions of zed 2 and lambda-term 2 sta= ble enough.

3.0 era

This time, we are entering zed 3, lambda-term 3 era. The features introduce= d since zed 2, lambda-term 2 are quite stable now and the new feature coming to us will have a bit more impact, es= pecially to vim users. So it's worthwhile to draft an announcement:

  • VI Editing Mode

    3D"ca1192404697=

    OCaml guys, hope you enjoy this.

List of notable changes:

  • zed 2:
    • wide, combined glyph(Character Variation, IPA, CJK …)
    • add wanted_column support for wide width character
  • lambda-term 2:
    • wide, combined glyph(Character Variation, IPA, CJK =E2=80=A6)
    • add horizontal scrolling support for wide width character
  • zed 3:
    • add new actions for convenience
  • lambda-term 3:
    • LTerm_read_line: add initial support for vi editing mode:<= /li>
    • motions:
      • h l 0 ^ $
      • j k gg G
      • w W e E b B ge gE
      • f F t T
      • aw iw aW iW
      • include or inner ( ), [ ], { }, < >, ' and "
      • generic quote: aq? iq? where ? could be any character
      • bracket matching: jump back and forth between matched brackets
    • delete, change, yank with motions
    • paste: p P
    • line joining: J

for a full list of the changes, please visit the homepages of each project.

Projects underneath:

  • charInfo_widt= h: Determine column width for a character
  • mew & mew_vi: Modal editing witch & Its VI in= terpreter complement. In a word, modal editing engine generators.

What's next

  • VI Editing Mode

    1. Visual mode

      3D"7cc45010710a=

    2. register support and more vi compatible
  • CJKV

    We've recorded more then 100 thousand entries about the structure of CJK ch= aracters, what is a character consists of, how are the sub-assemblies glue together etc. And as a complement to charIn= fo_width, we may release a new project called charInfo_structure ;)

Looking for "lovely, idiomatic" examp= les of Ocaml used for shell-scripting in the manner of Perl/Python (but esp= . Perl)

Archive: https://discuss.ocaml.org/t/looking-for-lovely-idiomati= c-examples-of-ocaml-used-for-shell-scripting-in-the-manner-of-perl-python-b= ut-esp-perl/5703/1

Chet Murthy announced

I wonder if there are people who have written nontrivial Ocaml code for she= ll-scripting, that they think exemplifies the right way to do it. I've been a Perl hacker for 25yr, and so when I re= ach for Ocaml to write stuff that should be Perl shell-scripts, I always find it a bit painful, and there's a signif= icant overhead to getting the job done. Some of that is applying ocaml to a new domain, but some of it is that I'm = just not using the right idioms and tools (and there are so many to choose from).

So if anybody has good pointers, I'd appreciate learning about them.

Bikal Lem

Haven't tried it myself, but this looks promising … https://github.com/janestreet/shexp.

At least it has the great Sean Connery in its README so possibly worth delv= ing a bit. :)

Hezekiah Carty

bos seems like it can do = a lot of what you're looking for. It's at least worth taking a look, though it may not be at Perl levels of concise for this kind= of task.

Martin Jambon

I tried to summarize my take on the subject into this gist: https://gist.github.com/mjambon/bb07b24f89fa60c973735307ce9c6cb9

I'm not aware of the existence of such tool, but this is how I might design= it. This should be reminiscent of camlp4's quotation and anti-quotation system, which allows alternating betw= een two syntaxes within a source file.

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 RSS feed of the archives<= /a>.

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

Alan Schmitt

--=-=-=--