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Here is the latest OCaml Weekly News, for the week of May 05 to 12, 2020.

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-idiomat= ic-examples-of-ocaml-used-for-shell-scripting-in-the-manner-of-perl-python-= but-esp-perl/5703/13

Continuing this thread, Chet Murthy said and Aaron L.= Zeng replied

  • needs to be Ocaml code, not an interpreter. I mean, if I=E2=80=99m not = going to write it in Ocaml, I might as well write in Perl, yes?

I think shexp might deserve another look. It's not an interpreter for a se= xp-based shell language, as its name might unfortunately deceivingly suggest. It's really a DSL for constructing shel= l pipelines using a 'a Process.t monad. The s-expression part is advertising that you can debug and trace the actio= ns performed using s-expressions.

The second-most-important part of Perl/Bash scripting is string-handling. A= nd it=E2=80=99s certainly the part of Ocaml that=E2=80=99s most painful when writing scripts. Let=E2=80=99s stipulate that there are n= ice libraries to make this easy. I=E2=80=99m an Ocaml bigot, I have to believe this anyway grin . This library doesn=E2=80= =99t seem to use 'em, nor choose/promote a particular set of such libraries.

I've found Base plus Re to be sufficient for most of my string-manipulation needs. It's never going to be as concis= e as Perl's built-in "magic" support for regexps, but you gain explicitness and clarity, which is part of the benefi= t of OCaml anyway.

Chet Murthy said and Donn Cave replied

It=E2=80=99s not as trivial in Ocaml, for many complicated reasons that boi= l down to =E2=80=9Cgee, string-handling is a PITA=E2=80=9D.

Really? hadn't noticed. Ha ha.

I could never really get urge for Perl, but I use its ancestor awk a lot, a= nd I'm trying out some awk-like simple string functions, like 

let strlen =3D String.length
let sub s i n =3D let b =3D strlen s
     in if i < b
         then let n =3D min n (b - i)
         in String.sub s i n
    else ""
(* s=
ubstring to end of line *)
let substr a=
 i =3D if i < strlen a
     then String.sub a i ((strlen a) - i)
     else ""
let matchre t s =3D try
     Str.search_forward t s 0
     with | Not_found -> -1

etc.

So "open Awk" gets me a handful of more basic variations on common string f= unctions, with less elaborate parameters, no normal exceptions, etc. Including a line by line file processing functi= on. I have just newly started on this and haven't used it extensively, but it seems fairly promising. No wacky synta= x or hyper intelligent string processing, no packages, just a few dozen lines of cheater functions.

"Awk" is a misnomer, in that there's little correspondence between this and= awk, it was just what inspired me to try it.

Rapha=C3=ABl Proust said

I don't think it's lovely and I have no idea if it is idiomatic, but I made= a few scripts of my own in OCaml using the same library that other mentioned: bos

  • typepass use= s xdotool to type passwords from the password pas= sword manager
  • conn wraps wpa_supplicant, dhcpcd, ip, and other net= work management CLI
  • laptop-stat= us fetches status information for laptops (e.g., battery level) and pri= nts it in a nicely formatted form
  • bakelite inc= reases or decreases screen brightness

Vasile Rotaru also said

https://github.com/hammerl= ab/genspio

Gabriel Radanne also said

I have no particular opinion about the rest, but at least on the regex side= , this might be of interest: https://github.com/paur= kedal/ppx_regexp

If that's still not good enough, I would be very interested by suggestions = on how to make it more convenient. :)

OCamlUser proposed

I'm not sure about idiomatic, but I do have a utop config that I use to do = some one-off scripting in OCaml that uses shexp 

#use "topfind"
#warnings "+a"
#thread
#require "ppx_jane,core"
#require "shexp.process"
#require "lambdasoup"
module List' =3D List=

open Shexp_process
open Shexp_process.Infix
open Core

module Html =3D struct
    include Soup

    let of_string =3D parse
end

let read_lines cmd<=
/span> =3D
    eval (call cmd |- read_all)
;;

let wget url=
 =3D
    read_lines ["wget"; "-O"; "-"; url]
;;

let chrome_curl url=
 =3D
    read_lines ["curl"; "-k"; "-sA"; "Chrome"; "-L"; url; "-o"; <=
span style=3D"color: #8b2252;">"-"]
;;

let split_lines =3D String.split ~on:'\n'
let filter_lines su=
bstring =3D List.filter ~f:String=
.(is_substring ~substring)
let to_html =3D Htm=
l.of_string
let find_html pat html =3D Html.(html $$ pat)

let (%) =3D Fn.compose

Then a simple script called shexp in my path: 

utop -init ~/bin/ocaml-shexp-config

I add little helper functions as I come upon them. I find it's much easier = to transition to a file, or full program when I need it. Example program: 

utop # read_lines ["sensors"] |> split_lines |> filter_lines "Core 0"=
;;
- : string list =3D
["Core 0:        +63.0=C2=B0C  (high =3D +84.0=C2=B0C, crit =3D +100.0=C2=
=B0C)"]

Anton Kochkov said

Not exactly OCaml, but can be made with the OCaml syntax as well - see BATSH.

Bikal Lem also said

I just found this - https://gith= ub.com/ShamoX/cash. @Chet_Murthy This may be the closest to ocaml shell= scripting experience re perl.

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/5684/9

Continuing this threaad, Luc_ML said

Before studying more complex books, it's a good idea to first get an overvi= ew.

O= Caml for the Skeptical / OCaml in a Nutshell : the title is funny; its main advantage is that it covers most OCaml concepts in= 21 short sections where you can experiment by yourself on simple but essential things.

The books/courses already mentioned are nice. You can also consider this on= e that offers many examples/exercises and also a good overview: Developing Applications With Objective Caml.

LE LANGAGE CAML mentioned by @nojb is an excellent book. Written in Caml Li= ght, it's easy to turn it by yourself into OCaml. It offers a great chance to learn how to do a lot of things in pu= re Caml with only stdlib and a simple syntax extension system (use camlp5 (i.e. the "genuine camlp4") that is fin= e for that. It works out of the box to deal with streams and it's a chance to understand what is a LL(1)/recursive= descent parser).

Dune meeting notes

Archive: = https://discuss.ocaml.org/t/dune-meeting-notes/5710/1

J=C3=A9r=C3=A9mie Dimino announced

I just wanted to publicise that we are now publishing the notes from our Du= ne meetings on the wiki:

https://github.com/ocaml/dun= e/wiki

These meetings happen via video-conference every two weeks. If you are inte= rested in following the development of Dune more closely, this is good place to look at.

OCaml 4.11.0, first alpha release

Archive: https://discuss.ocaml.org/t/ocaml-4-11-0-first-alpha-release/= 5716/1

octachron announced

The set of new features for the future version 4.11.0 of OCaml has been fro= zen. In the next few months, the OCaml compiler team is focusing on bug hunting = and fixing.

For this release cycle, we have decided to test publishing regularly alpha = versions of OCaml 4.11.0 in order to help fellow hackers join us early in our bug hunting and opam ecosystem fixing f= un. Once the opam ecosystem is in shape, these alpha releases will morph into t= he usual beta and release candidate releases.

If you find any bugs, please report them here: https://github.com/ocaml= /ocaml/issues

The compiler can be installed as an OPAM switch with one of the following c= ommands 

opam switch create ocaml-variants.4.11.0+alpha=
1 --repositories=3Ddefault,beta=3Dgi=
t+https://github.com/ocaml/ocaml-beta-repository.git

or 

opam switch create ocaml-variants.4.11.0+alpha=
1+VARIANT --repositories=3Ddefault,beta=3Dgit+https://github.com/ocaml/ocaml-beta-repository.git

where you replace VARIANT with one of these: afl, flambda, fp, fp+flambda

The source code for the alpha is also available at these addresses:

htt= ps://github.com/ocaml/ocaml/archive/4.11.0+alpha1.tar.gz
https://caml.inria.fr/pub/distrib/ocaml-4.11/ocaml-4.11.0+alpha1.t= ar.gz

If you are interested by the ongoing list of new features and fixed bugs, t= he updated change log for OCaml 4.11.0 is available at:

https://github= .com/ocaml/ocaml/blob/4.11/Changes

OCaml Users and Developers Meeting 20= 20

Archive: https://discuss.ocaml.org/t/ocaml-users-and-developers= -meeting-2020/5454/2

Ivan Gotovchits announced

Due to the multiple requests and since ICFP will be now officially held onl= ine with a significantly reduced fee, we decided to extend the submission deadline till the end of this month. We ar= e hoping to attract a larger and more diverse audience this year, given that the new format is more accessible bo= th travel-wise and financially.

Please, share the news widely!

Important Dates (updated)

  • Talk proposal submission deadline: May 29th, 2020, AoE
  • Author Notification: July 17th, 2020
  • OCaml Workshop: August 28th, 2020

VSCode Platform Plugin 0.5.0

Archive: https://discuss.ocaml.org/t/ann-vscode-platform-plugin-0-5-0/= 5752/1

Rudi Grinberg announced

This release contains a couple of major improvements:

  • Syntax highlighting is vastly improved. There's now highlighting for ma= ny more filetypes, and the core highlighting for OCaml is far more accurate= .
  • There's integration with package managers such as opam and esy. One may= now explicitly use them to explicitly select the sandbox that contains the= lsp server and related tools.

Under the hood, the entire plugin was rewritten from typescript to OCaml (b= ucklescript). This should hopefully make contribution more accessible to OCaml hackers.

I'd like to thank @rustykey, @mnxn, @prometheansacrifice, and @imbsky for t= heir contributions to this release. Their help is the reason for this vastly improved version of the plugin.

As usual, the plugin is available directly using vscode's extension market = place. I'll leave a link to the plugin here to avoid confusion with the many other OCaml plugins available.

Please report any issues on the bug tracker

Other OCaml News

From the ocamlcore planet blog

Here are links from many OCaml blogs aggregated at OCaml Planet.

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

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