<coventry>
It seems that in js_of_ocaml, `Js.Unsafe.global##.test_name := 1` will assign to `window.test`, dropping everything after and including the underscore. Is this documented anywhere? I don't see it on https://ocsigen.org/js_of_ocaml/3.1.0/manual/ppx . Can anyone reproduce?
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<orbitz_>
Is js_of_ocaml considered the standard use for JavaScript or is BuckleScript replacing it?
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<companion_cube>
orbitz: not sure if there's a "standard", but BS is definitely not it
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<gonz_>
companion_cube: Why is that?
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<companion_cube>
because jsoo respects OCaml's semantics, whereas BS is more of a "do what I mean" compiler, afaict
<companion_cube>
I think BS is like "use OCaml as a frontend for JS" and jsoo is "make JS another backend for normal OCaml"
<gonz_>
Do you have an example?
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<companion_cube>
not particularly, but ask Drup about jsoo vs BS and you'll see ;-)
<gonz_>
I have a feeling asking people who are too snowed in on OCaml is generally a bad idea
<gonz_>
in almost every context
<gonz_>
But yeah, fundamentally OCaml is just a better way for me to produce Javascript
<reynir>
There's also the thing that bucklescript is stuck on an old version of OCaml
<companion_cube>
so maybe BS would fit you
<gonz_>
The language outside of that use-case isn't interesting enough
<companion_cube>
are you using reason as well?
<gonz_>
Ugh, no
<gonz_>
Not since their horrible decision to go full JS with the syntax
<gonz_>
What a pointless change
<reynir>
gonz_: which one do you use?
<gonz_>
reynir: As in...? I use the BS compiler and as you said that's pinned on an older version.
<reynir>
BS or jsoo
<gonz_>
BS
<gonz_>
It was an easier sell to my project manager as well
<gonz_>
because of the readable JS
<gonz_>
Though I doubt anyone ever reads it...
<reynir>
Ah
<reynir>
Yes, I don't quite understand why readable JS is desirable heh
<gonz_>
The idea that you could, I think, is a good one.
<Drup>
It's a fantasy, though
<gonz_>
Personally I have a much easier time reading OCaml anyway
<Armael>
Well it's readable as long as you write ocaml that can be trivially translated to js
<gonz_>
Only if the compiler was producing garbage would it be a reasonable idea to debug at the JS level
<companion_cube>
I think jsoo has source maps, doesn't it?
<reynir>
companion_cube: yep
<gonz_>
The way I got the project manager interested was to point to reason
<gonz_>
and then I wrote it using the OCaml syntax instead
<Drup>
gonz_: nice strategy :D
<Armael>
:)
<Drup>
the good thing about the reason *syntax* is that it doesn't really matter, since you can have both reason and ocaml file coexist
<Drup>
(the same cannot be said about BS and jsoo ~~)
<reynir>
gonz_: haha :D
<gonz_>
For a brief time I also converted all ml files to re files with the tooling
<gonz_>
But eventually I removed them from the repo and stopped generating them
<reynir>
I tried converting a project to reason, but was stopped by some bugs
<gonz_>
I never bothered to actually run the reason files. I just generated them and commited them to the repo in case anyone was curious how the same code looks with that syntax.
<reynir>
One of them was when you build using jbuilder with an empty ppx and the reason file has a function that introduces a type variable
<companion_cube>
so your project was not reason-able? :p
<gonz_>
:D
<reynir>
:D
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<ZirconiumX>
That was terrible and you should be ashamed of yourself companion_cube
<ZirconiumX>
Well done.
<companion_cube>
I'm far past being ashamed of this
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<ryyppy>
test
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<ryyppy>
just to coin in to the JSOO / BuckleScript discussion: I think BS really shines in an npm based environment with a lot of existing javascript
<ryyppy>
i guess if your codebase is purely OCaml (like at Jane Street), it's probably better to go with JSOO
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<kakadu>
Folks, where can I read how to tell dune to genereate META?
<companion_cube>
dune generates a META
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<kakadu>
Mine doesn't
<kakadu>
I probably need to say/write something
<companion_cube>
well it installes a META file so I suppose it generates one :p
<discord>
<rgrinberg> kakadu, if you build the .install file the META will be generated
<discord>
<rgrinberg> you can look for the explicit META target as well of course: $ dune rules -m -r | grep -i META
<discord>
<rgrinberg> but you should have one. Just define a library with a public_name and you will have a META target
<discord>
<rgrinberg> You can't really read about it, since these low level details should be invisible to you
<companion_cube>
♥
<discord>
<rgrinberg> just create a library with a public_name and build the @install target
<discord>
<rgrinberg> kakadu, the docs seem deficient to you in some way. I wonder we should improve things.
<discord>
<rgrinberg> Is the distinction between public and non public libraries/executables clear?
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<discord>
<rgrinberg> Is it clear that there are really 3 targets that a user should make use of: aliases, executables, and user defined rules
<kakadu>
There idea seems to be right but a message like "You have zero public libraries" could be helpful
<discord>
<rgrinberg> Yeah, we've actually discussed this but it's a bit more subtle. It's quite valid to have an empty @install target (a project without any public libraries)
<discord>
<rgrinberg> Perhaps a $ dune describe command? To show a user what kind of entities a user has defined
<kakadu>
Is it already available?
<discord>
<rgrinberg> nah, but I'd like to have one
<kakadu>
btw, Why install @target is called `install`? I got an intuition that it is related to `make install` but it seems that intuition is wrong.....
<discord>
<rgrinberg> The @install target is an alias that depends on all targets that are "installable". Which is roughly everything that will be in your .install files for opam
<discord>
<rgrinberg> However, you can manually add dependencies to @install as well
<discord>
<rgrinberg> make install is approximately dune install
<discord>
<rgrinberg> Which will simply read the local .install files and copy those files to DESTDIR (or elsewhere)
<kakadu>
Also, `dune build @install` populates content of libraryname.install file but --verbose option doesn't print anything interesting, so it is easy to get an idea that `dune build @install` does nothing at the moment and something is wrong
<kakadu>
btw, is there any scenario when libraryname.install file should be edited by habd?
<discord>
<rgrinberg> Yeah, ---verbose is mostly useful for debugging external commands that dune executes. Here, what you'd really want to see what does dune think includes of a certain target (the @install target in this case)
<discord>
<rgrinberg> Nope.
<discord>
<rgrinberg> If you'd like to install custom stuff in the .install file, use the (install ..) stanza to include the custom stuff
<kakadu>
rgrinberg: What do you thing about a commnted line in .install file with text `Don't edit this manually, use install stanza`?
<discord>
<rgrinberg> Yeah, we could do that. Though I'm not entirely sure that .install files have a comment syntax
<discord>
<rgrinberg> This would also be useful for .merlin files as well
<discord>
<rgrinberg> The longer term solution to this btw is to have the .install files stay in _build and have opam look for them there
<discord>
<rgrinberg> It's a bad idea to pollute the source dir with build artifacts
<Armael>
.install files might have the same comment syntax as opam files (ie # or (* *))
<kakadu>
Also, can I compile single .cmo? In general, I'm preparing a configure step which will compile .cmo with syntax extension which will genereate some .c files. Names of .c files can't be infered from the names of .ml files. And I'm going to run dune again to compile all generated C files and with whole project
<discord>
<rgrinberg> Yes, you can compile any target manually by looking it up in $ dune rules -m -r
<discord>
<rgrinberg> But you will definitely need a configure step because dune must know the sources statically.
<kakadu>
Yeah, the doc mentions it
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<orbitz>
Drup: so you suggest jsoo?
<Drup>
*cough*
<orbitz>
I'm not checking for a hernia.. ;)
<Drup>
If you want to write OCaml programs that are compiled to js, then yes, I suggest jsoo
<orbitz>
+1
<orbitz>
i've been using TS lately, iy's full of lies
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<freyr69>
rgrinberg: is non-public library feature of dune ready?
<freyr69>
could I have a library without an *.opam file
<discord>
<rgrinberg> of course you can. you just can't have a public library dependent on it
<discord>
<rgrinberg> you can have public executables depend on private libraries however
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<freyr69>
rgrinberg: I see. Are there any plans on making it possible to use priv libs in public ones?
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<monstasat>
Hi! I have a problem with React lib. I have an assoc list (e.g. (int * string) list) signal 'AS'. Then I create new signal mapped from 'AS', which has type 'string option React.signal'. The mapping function is `List.Assoc.get ~eq:(=) 2`. Sometimes I get an exception "signal value undefined yet" when I try to call React.value on this mapped signal.
<monstasat>
What may be the problem? When React.signal value is undefined?
<monstasat>
I thought that when someone creates a signal it initially has a value
<monstasat>
Like when I call `React.S.create 1` the initial value is 1
<monstasat>
I forgot to mention that this exception is thrown when the value of the mapped signal is None.
<monstasat>
And the code is compiled with jsoo compiler
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<adrien>
monstasat: is that the exact exception you get?
<adrien>
yeah, seems like it is
<adrien>
( let err_sig_undef = "signal value undefined yet" )
<adrien>
monstasat: could you show the actual code?
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<monstasat>
adrien: yeah, exactly. I think this can only happen only when getting value in an update step
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<monstasat>
adrien: it seems that I should rewrite my code with a better design :)
<monstasat>
adrien: it seems that I should rewrite my code with a better design :)
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<adrien>
monstasat: reading the code I thought the same
<adrien>
I think/guess that it happens when a value is being updated during an update cycle and you are querying the value during the same update cycle
<adrien>
probably need a different design
<adrien>
quite likely you need to do less by hand and more through react's api
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<freyr69>
Why dune compiles something with ocamlc even with (modes native)?
<reynir>
ppx maybe?
<zozozo>
interfaces ?
<freyr69>
No, regular ml file
<freyr69>
but it uses ppx
<freyr69>
*being preprocessed
<freyr69>
is that a reason?
<zozozo>
i don't know
<freyr69>
It's too opinionated, I think
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<gonz_>
Are there any nice solutions for i18n in OCaml? I've found some very outdated and seemingly abandoned gettext stuff.
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<ZirconiumX>
companion_cube: Thoughts on putting infix comparators that take a `compare` function and turn it into `(>)` etc in CCOrd?
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<ZirconiumX>
Or perhaps just a `gt`/`lt`/`le` or whatever
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<coventry>
copy`: Thanks.
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<orbifx1>
what's up
<ianconnolly>
struggling to convince dune to put the appropriate incantation into a .merlin file for lwt.ppx :/ the binary itself is building fine tho. anyone have any recent'ish experience of the same problem?
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<orbifx1>
ianconnolly: don't know much about merlin :(
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<orbifx1>
Should I split Logarion into multiple repository for each binary and one for the core library?
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<rgr[m]>
freyr69: dune will use ocamlc to generate cmis. Because those are target independent
<rgr[m]>
ianconnolly: there should be no need to tweak your .merlin file at all. If you think dune is generating a bad . merlin please post it on discuss.ocaml or the bug tracker.
<ianconnolly>
will try and get you a minimal reproducible example and post tomorrow
<rgr[m]>
I know quite a lot of people use that ppx with dune and merlin without any problems btw. So it has to be a bug or something in your environment
<rgr[m]>
Thanks. Ping me once you have it up
<rgr[m]>
freyr69: yes there are plans to allow private deps in public libs. It's quite easy but requires slightly tasteless name mangling.
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