adrien changed the topic of #ocaml to: Discussions about the OCaml programming language | http://www.ocaml.org | OCaml MOOC http://1149.fr/ocaml-mooc | OCaml 4.02.3 announced http://ocaml.org/releases/4.02.html | Try OCaml in your browser: http://try.ocamlpro.com | Public channel logs at http://irclog.whitequark.org/ocaml
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<flux> fs4lv1n1, you cannot. the idea (for me at least) is to have a local database available for that purpose.
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<fs4lv1n1> flux: I'm not sure but I assigned the env vars like PGHOST and not It's working
<flux> works for me.. :(
<flux> :) that is
<fs4lv1n1> s/not/now
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<seangrove> Looks like list concatenation, but I'm not sure where it comes from
<seangrove> Maybe Batteries or Core?
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<reynir> Is that the full file? I don't see any "open"s
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<seangrove> reynir: Not sure, just a snippet. Thought it might be a common function
<seangrove> Oh, nice! Thanks!
<reynir> I don't know if any of it is relevant :/
<seangrove> Well, it's a nice tool to know about anyway :)
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<seangrove> Drup: in fuctoria, is it possible to have e.g. `Key.create "email_api_key" Key.Arg.(opt string None i)` ?
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<seangrove> Ok, so it looks like there's not a way to use Mailgun's http api with OCaml right now, because cohttp doesn't support multipart/form-data
<seangrove> Well, maybe I can set the headers manually...
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<Stalkr_> Hi, I have function A and B that are dependent on each other. A calls B, B calls A. How do I solve this? Are there no `let A = ... and let B = ...` like with types?
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<Stalkr_> Looks like I can just do `let A = ... and B = ...` hope this is correct
<Quota> yes, yes it is
<Stalkr_> Quota: I am getting Warning 10: this expression should have type unit. here https://gist.github.com/anonymous/1e54b25aff7693e72db7ddececf2490f interp is supposed to return unit, do you have any idea what I am doing wrong? I have tried wrapping interpStm in () too but still getting warning
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<_gt> hello
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<_gt> I want to rewrite my code, which make all permutations from python to OCaml, but I can't figure out how to use slice in OCaml.
<_gt> here is my python code
<_gt> def permutations(s):
<_gt> if len(s) > 1:
<_gt> for i, v in enumerate(s):
<_gt> for p in permutations(s[0: i] + s[i+1:]):
<_gt> yield [v] + p
<_gt> else:
<_gt> yield s
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<lyxia> _gt: it's Array.sub
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<reynir> seangrov`: I found this https://github.com/mirage/ocaml-cohttp/issues/181
<ggole__> Stalkr_: interpStm seems to have a return value that is not unit
<ggole__> If you want to ignore it, use ignore (...) (which the warning is aware of).
<Stalkr_> ggole__: That is true, it is not possible to have that return something but interp to return unit?
<Stalkr_> ignore (interpStm s []) works without using () too thanks
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<Drup> seangrov`: probably, what's the problem ?
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<orbifx> Is there a way to iterate a record structure?
<zozozo> you mean, iterate through the fields of a record ?
<mrvn> only with Obj or C code.
<mrvn> or ppx
<mrvn> worst case you can shorten the screw or place the spacer between the part and the motor.
<mrvn> ups
<ggole__> How would you even type that?
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<mrvn> ggole: magic
<ggole> I suppose you could do it with ocamlty or something like that
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<orbifx> Hmm ok, I think I've got to avoid records for this implementation
<orbifx> Thanks
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<Leonidas> interesting, the effect paper is 2 pages, the modular implicit paper is 42 pages.
<Leonidas> orbifx: the issue is the code that iterates over a record would have to have a type signature of roughly 'a -> 'a at which point it is not overly useful.
<orbifx> Yeah, I realised that from the solutions given
<orbifx> I mean what others suggested as solutions
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<leyyin> does anyone know if there exists a tool for automatic style formatting for ocaml code?
<leyyin> something similar with clang-format for C/C++
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<Algebr``> ocp-indent
<Algebr``> (and I never had success with clang-format! :( )
<leyyin> isn't that for only indentation?
<Algebr``> Oh style, like google style vs webkit style, etc
<leyyin> yes :)
<leyyin> clang-format is great once you figure it out
<Algebr``> don't know, don't think so. clang-format broke my code (macros macros)
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<giing3r97> notepad++ ?
<leyyin> giing3r97, was that regarding my question?
<leyyin> does notepadd++ even support ocaml code?
<giing3r97> Of course
<giing3r97> And you can customize the style at your wish
<Algebr``> can't tell if this is trolling or being serious
<giing3r97> You can also use unix editors like vim or nano
<leyyin> do they support automatic style formatting for ocaml code?
<leyyin> don't you need a plugin?
<leyyin> or a tool that can do that
<giing3r97> Not sure what you mean :-/
<giing3r97> You want to autoindent a file and have some nice color styling ?
<leyyin> nope :)
<leyyin> for example I have in my code `let a=2` and I define my rule so that there is spaces around the `=` so the tool will convert that code to `let a = 2`
<giing3r97> Well, write your own script to parse a caml file and do as you wish :-)
<leyyin> is not that simple :P
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<giing3r97> Write it in caml :-)
<Algebr``> leyyin: I don't think such a tool exists at the moment
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<fds> GNU Indent does this for C, right? So maybe submit it as a patch for ocp-indent.
<fds> If they're interested
<Algebr``> I was hoping someone would extend clang-format
<leyyin> I think a separate tool
<leyyin> ocp-ident seems specialized on indentation
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<orbifx> Thanks copy`
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<flux> ygrek, thanks for the pointer! do you know how c dependencies should appear in that?
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<flux> I guess I should find an ocaml project that makes a native code library and uses it in another directory and see how it's done..
<hcarty> leyyin: It doesn't exist yet, unfortunately
<ygrek> C dependencies are not tracked that way
<ygrek> that's why one has to specify them in _oasis CSources
* leyyin starts writing it
<leyyin> *when I have time*
<flux> ygrek, so I guess it means I cannot interrogate ocamlbuild about what it thinks the dependencies are, other than -verbose bignumber?
<flux> hmm, so I guess the -lFFmpeg-stubs gets baked into the library, but that in itself doesn't create any dependency from the binary using the library to the stubs
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<flux> I've tried things like dep ["link"; "use_FFmpeg"] ["ffmpeg/libFFmpeg-stubs.a"]; but that doesn't seem to affect anything
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<ygrek> you pass -l with -cclib and that cmdline arg gets embedded into cma cmxa meta info
<ygrek> and ocamlopt will add that to linking phase when linking any binary using that cma
<flux> right, and that part works fine
<ygrek> why are you doing it by hand?
<flux> but the part where modifying the .c file results in the binary being relinked doesn't
<ygrek> add dep from .c to .a or .cma and then ocamlbuild should rebuild it iiuc
* ygrek afk
<flux> but if there is no such dependency already, why does it rebuild the .cmxa when I modify the .c?
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<flux> so I think the reason is this: the .cmxa does not get changed when the c-file changes
<flux> and because the .a isn't a direct dependency of the binary, merely a switch passed to it, it doesn't think the binary shuold be recompiled
<flux> but how do I fix this? btw, the repo is at https://github.com/eras/webcamviewer/ if someone is feeling super-helpful, the source in question is ffmpeg/ffmpeg-stubs.c ;)
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<seangrove> Any easy way to turn a Cohttp Request into a string (uri, headers, etc.)? I want to email it in the case of an error.
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<Algebr`> seangrove: maybe use one of the sexp serializers then turn it into string
<Algebr`> aka I see: val Cohttp_lwt.Request.sexp_of_t t -> Sexplib.Sexp.t and then turn that Sexp.t into a string
<MercurialAlchemi> sign that you're getting tired: you momentarily try to work with the standard library
<companion_cube> I must be tired often
<companion_cube> o/ people
<MercurialAlchemi> well, you write an stdlib, you don't have much choice (at least when you do that)
<MercurialAlchemi> but trying to use the Sys module when you could use lwt, that's usually masochistic
<companion_cube> ah, if you're doing mosly IO, yes
<MercurialAlchemi> I'm not sure what the stdlib is good at that third-party libraries are not considerably better at, actually
<MercurialAlchemi> I mean, sure, you're going to use List.map and friends, unless you use jane street's replacements, but apart from that?
<flux> can I tell ocamlbuild that something depends on foo.cmi, without ocamlbuild adding that foo.cmi to the compilation line?
<companion_cube> its good at being shipped with the compiler?
<companion_cube> the data structures are ok, also
<MercurialAlchemi> yeah, that's what I was trying to say with my List.map mention
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<companion_cube> I think the stdlib is ok (albeit a bit small) for algorithmic programs
<companion_cube> which is what many people write in OCaml
<MercurialAlchemi> hm
<MercurialAlchemi> that's being generous
<companion_cube> well it's not going to fullfill all the needs, sure
<MercurialAlchemi> you can't even pipe data efficiently
<companion_cube> but no stdlib can
<companion_cube> yeah, that's why I'm talking about algorithmic
<MercurialAlchemi> well, no, but it's 2016 and linq and guava have been around for a few years now
<MercurialAlchemi> fortunately gen and seq are not far away
<companion_cube> I don't know guava, isn't it just a java stdlib?
<MercurialAlchemi> well, yeah, with constructs like List.transform
<MercurialAlchemi> which are lazy
<companion_cube> (what's the type?)
<companion_cube> ah I see
<_y> if i write something like « Array.make n 0 » (or « Array.make n Z.zero »), does it get specially optimized as compared to the case where we fill the array with a non‐empty value?
<MercurialAlchemi> (which can bite you quite easily if you don't pay attention)
<_y> *non‐zero value
<companion_cube> _y: I don't think so
<MercurialAlchemi> it's just that I can't imagine operating on arbitrarily-sized collections without this kind of stuff
<companion_cube> well, yeah, we should have iterators
<companion_cube> :
<companion_cube> :/
<MercurialAlchemi> yeah
<MercurialAlchemi> I think there is a stream module in the stdlib that nobody uses?
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<companion_cube> kind of
<MercurialAlchemi> but anyway, it's always this weird distorsion with ocaml, where you have laser guns next to stone age tools
<flux> (I guess I messed something up earlier, now it again works like I expected it to ;))
<MercurialAlchemi> like the community was playing a crazy game of civilization
<companion_cube> :D
<flux> mercurialalchemi, well it's a bit like writing portable C
<flux> so cool folks already know all about it!
<MercurialAlchemi> flux: I don't get it, but my brain is starting to melt a bit
<MercurialAlchemi> hm, talking about stone tools, ounit apparently never heard about integration tests
<MercurialAlchemi> who would be crazy enough to need setup/teardown functions?
<flux> ..it does have setup/teardown functions
<MercurialAlchemi> oh, I see bracket
<MercurialAlchemi> just the getting started which only mentions tmp_file and tmp_dir
<companion_cube> you seem a bit tense, MercurialAlchemi
<MercurialAlchemi> soon bedtime, I think
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<companion_cube> so after 4.03, there might be discussions about the stdlib
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<companion_cube> I'll try to push iterators into it
<MercurialAlchemi> that'd be great
<MercurialAlchemi> I'll tone down my criticisms of the stdlib by 50%
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<Algebr`> its a common topic around here.
<fds> Reforms of the standard library would be cool.
<Algebr`> We pin 95 complaints to Iniria's door.
<companion_cube> no guarantee it will work
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<flux> meh, I almost fixed it, now I can end up in the "inconsistent" case when I modify code. well, gotta try fixing it at some point..
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<MercurialAlchemi> anyway, enough ranting, time for snoring
<MercurialAlchemi> night all
<companion_cube> good night MercurialAlchemi
<companion_cube> st
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<Leonidas> companion_cube: yes, iterators!
<companion_cube> yay
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<seangrove> Algebr`: There's a top-level printer (I think) for Request though, surely I could use that somehow?
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<seangrove> The sexp route seems pretty heavy
<companion_cube> ppx_deriving.show?
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<seangrove> companion_cube: I'm trying to capture a Cohttp Request as a string for an report email (backtrace + error + context) when an error occurs in production
<companion_cube> yeah well, pp_hum
<companion_cube> apparently
<seangrove> Can I apply ppx_deriving.show to someone else's types?
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<seangrove> companion_cube: Ah, that could make sense. Have to find out how to use formatters
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<companion_cube> with ppx_import, maybe
<companion_cube> but just Format.printf "request: %a@." Request.pp_human req
<companion_cube> shoudl do the trick
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<seangrove> companion_cube: What about capturing it to a string?
<companion_cube> Format.asprintf "foobar %a" Request.pp_hum req
<seangrove> companion_cube: Ah, perfect. I tried Format.sprintf, but types were wrong
<companion_cube> yep, asprintf exists for this very reason
<companion_cube> (look at the @since)
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<seangrove> companion_cube: Thank you very much for that, hope I had the right twitter persona
<companion_cube> looks like it! :)
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<Algebr`> There's an actual Request.pp_human function?
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<companion_cube> pp_hum, sorry
<companion_cube> for human readable