lapinou changed the topic of #ocaml to: Discussions about the OCaml programming language | http://caml.inria.fr/ | http://www.ocaml.org | OCaml 4.01.0 announce at http://bit.ly/1851A3R | Public logs at http://tunes.org/~nef/logs/ocaml/
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<oriba> I tried to use Http_client from ocamlnet. It does not wor as expected. Did I missed sometihing? http://pastie.org/8941958
<oriba> I get "Unserved" as result
<oriba> With Http_client.Convenience I can get the same URL and print the contents.
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<samae> Drup, hcarty: yeah, ocaml cairo does the trick : )
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<samae> It's slightly slow for 1024x1024 bitmaps, but it is bearable
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<Drup> (you can use this ocasion to do vectoriel instead of pixels, because vectoriel is fantastic™ :D)
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<samae> Drup: vectorize this: http://postimg.org/image/5tcd1ex95/
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<samae> : p
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<Drup> no problem with cairo shading
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<Drup> http://cairo.forge.ocamlcore.org/tutorial/ see the section concerning masks
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<elfring> I am trying out another application.
<elfring> Would you like to help me in resolving the following error message?
<elfring> error loading shared library:
<elfring> /home/elfring/.opam/system/lib/batteries/batteries.cmxs: undefined symbol: camlLazy
<adrien> you need to show the command-line used to build
<elfring> For which software component would you like to determine build parameters?
<adrien> everything?
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<elfring> Have you got any experiences around the symbol "camlLazy"?
<adrien> won't tell :)
<adrien> you haven't told what you were doing and how
<adrien> you've given 0 context
<elfring> Are you interested to get the OCaml batteries (current software version provided by OPAM) working with the evolving application "Coccinelle"?
<adrien> can you detail the issue
<elfring> I would appreciate your advices for a topic like "Cooperation with OCaml batteries?".
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<adrien> might be an issue in batteries
<adrien> would need to see a strace and/or ld.so's debug output
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<adrien> ah
<adrien> would need to check "-linkall"
<adrien> I need to leave now unfortunately
<adrien> be back a bit later
<elfring> The OCaml batteries can be loaded in other application contexts as expected also with my OPAM configuration.
<elfring> I assume that my run time environment will need a few more tweaks just for the software "Coccinelle".
<adrien> the main executable has to be linked with -linkall
<adrien> -linkall
<adrien> Force all modules contained in libraries to be linked in. If
<adrien> this flag is not given, unreferenced modules are not linked in.
<adrien> so if the cmxs needs lazy but the main executable doesn't and hasn't been created with -linkall then it won't be provided it
<adrien> I really need to go now though my other lazy french people should be up soon
<adrien> (I think I broke a small foot bone)
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<elfring> Which of the two software parts would need the addition of the build parameter "linkall" eventually?
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<adrien_oww> elfring: the main executable
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<freling> hi, I was wondering if it is possible for ocaml compilers to show detailled error messages with the source line like clang (http://clang.llvm.org/diagnostics.html)
<freling> I'm using the version 4.01.0 but I don't know very well all options to pass to the compiler
<rom1504> freling: by default, the ocaml compiler give a lot of detailled messages, a lot of things about type for example
<freling> yes, but I would like the compiler to print the source line
<freling> I often have to check with the column number
<rom1504> oh ok, I don't know if it can do that, I don't think it can
<rom1504> even gcc doesn't do that
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<freling> it does since 4.8 (and with color starting with 4.9)
<freling> it's not a killer feature per se, but I find it more comfortable to read
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<ygrek> that makes sense only if one is literally reading compiler output, like in stone age
<ygrek> most people who do not leave in the cave use editors that can jump to error location
<ygrek> though that of course doesn't exclude cases of being trapped in stone age cave with only compiler and clay tablets at hand
<freling> argh, I guess you have a point, so are you supposed to use merlin to compile?
* freling feels like a stone age man
<ygrek> when developing, of course, don't do the machine job
<ygrek> stealing machine's job is a criminal offense under great robotic act of 2050
<Drup> freling: you don't even need merlin for that
<freling> Drup: you mean, calling ocamlbuild through a shell command?
<Drup> freling: in emacs for example, without any mode, just use M-x compile and if there is some error in the output, emacs will parse the position and make you able to jump to it
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<rom1504> ygrek: haha, then I guess, doing a job will be illegal for a human in 2050 :p
<freling> Drup: usually it jumps to the line, not the proper column
<Drup> it does for me.
<freling> alright, maybe I need to look a bit further about how to do it properly then
<Drup> and for ocaml, since the error messages are properly formatted, it even highlight the faulty expression :3
<Drup> freling: which editor are you using ?
<freling> vim
<ygrek> vim works out of the box if you build with :make
<ygrek> rom1504, there will still be plenty opportunity of changing machine oil and polishing those shiny boxes with silicon
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<freling> will it call ocamlbuild? or should I create a Makefile
<ygrek> create Makefile
<freling> I find it a bit useless to create a Makefile , all the relevant information is in ocamlbuild _tags
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<Drup> ygrek: don't you have a command ":build" or ":compile" that except an arbitrary shell command ?
<Drup> expect*
<ygrek> then do :set makeprg='ocamlbuild xxx.native' every time you open a file
<freling> ok
<ygrek> Makefile is a common expected thing to have even if it contains only build and clean target
<freling> even in OCaml projects?
<ygrek> yes
<ygrek> look at all the projects out there
<freling> there is a bit of everything with oasis, ocamlbuild, makefiles, etc
<Drup> usually, the Makefile is just a proxy
<Kakadu> Drup: can emacs jump automatically to error location after compilation?
<freling> I wasn't sure what was the barebone configuration for a simple project
<Drup> Kakadu: not automatically, you have to clic/use a shortcut
<Drup> freling: well, it's more a question of conveniency
<freling> I can understand that
<Drup> "ocamlbuild -some-option fooo.native"
<Drup> "make fooo"
<Drup> less typing
<elfring> Do I get benefits if I would use the module "BatIMap" (instead of "BatMap" with integers)?
<elfring> Are there any specific implementation details I should care for?
<freling> Drup: shouldn't you put your options in _tags?
<Drup> freling: some options can't be put in _tags, unfortunatly
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<Kakadu> Drup: where should I look for this shortcut? compilation-mode?
<freling> I alias ob=ocamlbuild -use-ocamlfind
<Drup> Kakadu: probaly, yes
<freling> Drup: ah, didn't know that, my project is still quite simple
<Drup> elfring: It's quite well explained in the doc, BatMap is just AVL, BatIMap is something more specialized for ints, using ranges
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<elfring> I noticed a difference in my OCaml experiments. I did not get a small example to work if I would like to use "module My_map = BatIMap".
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<nicoo> adrien_oww: Shouldn't it rather be -linkpkg ?
<adrien_oww> you need -linkall if you expect to dynlink something
<nicoo> adrien_oww: Ah, yes
<nicoo> Drup, Kakadu : It is possible to auto-jump to the first error after compiling by using a post-compile hook (just add the right lambda to 'compilation-finish-functions)
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<Armael> oh well, i have a patch that should work to fix the camlimages giflib problems
<Armael> but as adrien said, to build on arch i think libexif's .pc file also need to be patched
<Armael> (samae, adrien ↑)
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<Armael> hmm, the last commit (revision 160) changes the OMakefile so its requires a giflib < 5; however, as indicated in the commit message, giflib isn't with pkg-config
<Armael> so on my system the check doesn't occurs
<Armael> I guess the OMakefile should be fixed accordingly, if giflib 5 is supported, but i don't know a thing about OMakefile
<Armael> anyway, I have the following diff atm: http://paste.isomorphis.me/kQI
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<oriba> someone here who has used ocamlnet, http-client? I tried it, and get Unserved status, and don#t know how to handle it
<Armael> adrien: I asked about the libexif stuff on #archlinux
<Armael> pks2 │ Armael: according to their API you should include libexif headers with <libexif/exif-*.h> anyway.
<Armael> so well, it seems that that are the guys who patch libexif's .pc that are wrong :-)
<Armael> so well, I don't know why camlimages guy (recently) decided to remove the libexif/ in the #include (rev 159)
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<Armael> i'll fill some issues on the camlimages bugtracker this afternoon.
<oriba> btw. camlimages ... I can't compile it on Arch.
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<elfring> How do you work with the difference that the function "BatIMap.empty" needs one parameter (while "BatMap.empty" works without it?)
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<companion_cube> elfring: by providing the parameter to BatIMap.empty?
<companion_cube> oriba: "and don#t know how to handle it" you sure like objects ^^
<oriba> companion_cube, I don't really like objects, even though the typo would indicate it ;-)
<companion_cube> it's a subconscious act
<companion_cube> you can't deny it
<oriba> companion_cube, I found an example for the ocamlnet stuff... with pipelines. It runs. But how to do it without pipelines? I don#t know how to use that stuff
<oriba> Regarding the objects, well, I looked at them over the last days
<oriba> The subconscious act: a missing Shift-key.
<oriba> (That happens in other contexts too... I would rather like functional style.... but, well, I need to use the OOP stuff, just top use ocamlnet... so if you want to refer to Freud, I have no problem with that ;-))
<oriba> companion_cube, you want to hear me praise OOP? ;-) (at least within OCaml)?
<companion_cube> what do you mean by "pipeline" in this context?
<oriba> there is Pipelining stuff in ocamlnet
<oriba> fopr asynchronus http.
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<oriba> Nice if it works, but I want to know the basics, and how to use just a simple http-request
<oriba> I can't figure out how to make that happen
<oriba> Some more examples would be nice
<companion_cube> I think there are tutorials in the ocamlnet documentation
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<oriba> The API does not look easy to understand to me
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<oriba> not matching my http-client problem, it seems
<companion_cube> hmmm
<elfring> I expected that I could use the module "BatIMap" without passing configuration parameters. Would a default comparison function be suitable there?
<flux> probably yes
<flux> is there no functorized version of BatIMap?
<oriba> companion_cube, but maybe it helps me decrypting ocamlnet's API ;-) ( you know; the OOP-annoyance...)
<flux> apparently BatIMap is so slightly different from regular maps that it needs a comparison function
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<def-lkb> elfring: since you want mutability, you can't have a pure valye for the empty structure
<elfring> How are the chances to specify a default comparison function for "BatIMap.empty"?
<def-lkb> highly likely?
<flux> elfring, your purpose is to have interchangeability between Map.Make(Int) and BatIMap?
<elfring> Yes!
<flux> if so, then it's a bit work, you would need to define a new module that implements the Map.S signature
<flux> mostly the work is in the form let domain = domain let union = union etc
<def-lkb> oh, I understand the problem know, got it wrong sorry
<flux> but then there's the matter of the equality comparison function that apparently is a parameter for functions in in BatIMap but doesn't exist in Map.S
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<def-lkb> indeed, the semantics are not same
<flux> so you would write something like this: module type EQ = sig type t val eq : t -> t -> bool end module Make(Eq : EQ) : Map.S with type key = int = struct type 'a t = 'a BatIMap.t let mapi = BatIMap.mapi let empty = BatIMap.empty Eq.eq ... end
<flux> (maybe this module should exist in batteries)
<elfring> That would be great!
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<companion_cube> oriba: the OOP is there because you can have many different, but overlapping, channel/stateful objects
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<def-lkb> 4
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<adrien_oww> 3
<freling> 2
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<rks`_> 1
<johnelse> boom?
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<companion_cube> johnelse: look at what you did
<johnelse> companion_cube: whoops :(
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* johnelse fetches a broom
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* companion_cube wishes iterators were a more common pattern in OCaml
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<mfp> Is it possible to change an OPAM pin without removing + reinstalling the pkg (plus those depending on it)?
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<mfp> more specifically, can I do opam pin pkg -f <newpin> && opam reinstall pkg or will the -f break my install?
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<Kakadu> I think that I have did this today and everything was OK
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<mfp> Kakadu: have you tried installing lwt from the github repos lately? OPAM is chocking on that
<Kakadu> no
<Kakadu> only eliom
<mfp> I'm getting this http://paste.debian.net/88410/
<mfp> looking into it to see if I have to report a broken build
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<mfp> hmm looks like it's using a newer version of some preprocessor which has a new "windows" predicate
<Kakadu> no idea, sorry
<mfp> thx for trying anyway :)
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<ygrek> opam pin pkg -f <newpin> && opam reinstall pkg <- sounds like a valid use case for me, did that several times
<Drup> mfp: I'm doing that all the time, I even reported several issues about this and all of them got fixed. With a recent opam install, it should run perfectly smoothly.
<mfp> got lwt to install, now rebuilding rev-deps. In case it helps someone: I had to run the dist.sh script in lwt's repos to tag + prepare the release
<mfp> ygrek: was in fact rebuilding because I'd run into the deadlock you fixed last month (involving Lwt notifications)
<ygrek> mfp, :)
<mfp> Drup: indeed, it really feels like a legitimate use case, but the manpage makes it sound somewhat scary ("Disable consistency checks.")
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<mfp> ygrek: btw. I have a trivial patch to
<mfp> oops ... to fix the backtraces reported by Lwt_log.* if you happen to also use libs like ocamlnet that register exn printers that raise exns (usually Not_found) themselves
<ygrek> exn printer raising exn is nice, pretty nice
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<Drup> mfp: that's probably because it was quite broken in the first version of opam :3
<mfp> I got sick of finding Not_found and Netexn.something in the logs
<ygrek> guess it will be upstream soon
<ygrek> ocamlnet is nasty in many different ways
<mfp> gotta send a pull req
<ygrek> I think I use only netencoding and eliminating it gradually
<adrien_oww> I'd like to be able to have Netexn not register its printer
<mfp> uh pinning against a git repos always uses master? (Just noticed my patch didn't make it to the build)
<mfp> is there some special uri or something to specify the branch to use in a pin?
<ygrek> #branch afair
<mfp> let's see if it works with a local repos
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<mfp> It does! :) -> opam pin lwt -k git ~/src/lwt#custom
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<companion_cube> elfring: I don't see how a reference to a Map is good where a hashtable isn't
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<flux> well, you can efficiently make copies of such Maps
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<elfring> companion_cube: Does a hash table change its stored keys "eventually"?
<companion_cube> what do you mean by changing its keys?
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<companion_cube> you put (k,v) in it, it remains there
<companion_cube> unless you remove it
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<elfring> flux: Is it more efficient to avoid a data copy completely (before copying because of the well-known immutable processing style)?
<elfring> Will a key be adjusted for a hash table after the function "replace" was called?
<companion_cube> well, it will change the binding for the key
<elfring> Does your wording for a key mean that its value changes?
<companion_cube> well, a key is a value. What changes is the hashtable mapping key->value
<elfring> I try to clarify it once more: Is it a "key functionality" that a hashing function is applied to "the key" for the data general structure "hash table"?
<companion_cube> of course hashing is required
<companion_cube> but there's a default hash function that fits most uses
<companion_cube> (if you use the polymorphic tables)
<elfring> It is "required" for such a kind of data structure. But I do *not*need that specific functionality for counting tasks that I am preparing here with small source code examples.
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<elfring> The key values should be stored unchanged for my specific use cases.
<companion_cube> but Maps require comparing keys
<companion_cube> the keys are stored 'as is'
<companion_cube> i never said the table only stored hashes
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<companion_cube> a hashtable is basically an array of (key, value) list, where each key is in the list whose index corresponds to hash(key)
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<elfring> I want that keys are just stored "as is"! Is "a map" a recommened data structure for this purpose?
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<companion_cube> elfring: both Map and Hashtbl are perfectly fine "key->value" storage
<companion_cube> you don't have to worry, your keys will be safe
<companion_cube> I don't understand your concern
<elfring> May I mail you my source code examples so that you can compare differences from the use of the discussed data structures?
<companion_cube> just use a pastebin, it will be simpler
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<elfring> I do not like "pastebin" ...
<companion_cube> or an equivalent
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<companion_cube> it would be much better on a pastebin or github gist
<companion_cube> (with a link in the PR if you want)
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<elfring> companion_cube: Did you commnent as "c-cube" on my feature request a few hours ago?
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<companion_cube> yes
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<elfring> Would you like to try out function calls like 'map_count "/";;' and 'counting_with_hash_table "/";;'?
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<companion_cube> modify_def also exists in BatHashtbl
<companion_cube> so the code for the hashtbl should be as straightforward as it is for Map, except more imperative
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