companion_cube changed the topic of #ocaml to: Discussions about the OCaml programming language | http://www.ocaml.org | OCaml 4.11 release notes: https://caml.inria.fr/pub/distrib/ocaml-4.11/notes/Changes | Try OCaml in your browser: http://try.ocamlpro.com | Public channel logs at http://irclog.whitequark.org/ocaml
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<d_bot> <poogle> I've installed ocaml-lsp-server via opam but ocaml-platform in vscode failing with 'Command ocamllsp not found.' `which ocamllsp` from my shell is showing that it is in my .opam dir. So what could be the issue here?
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<d_bot> <poogle> @theangryepicbanana still around?
<d_bot> <rgrinberg> @poogle did you select the opam switch that contains ocamllsp from within vscode?
<d_bot> <rgrinberg> There's a command for that
<d_bot> <poogle> @rgrinberg no. but fwiw, i only have one switch atm. i will look into it though
<d_bot> <poogle> @rgrinberg would this be under 'Ocaml configuration' in vscode?
<d_bot> <theangryepicbanana> probably
<d_bot> <rgrinberg> There's a command to launch to it. You can do `Cmd + P` and search for OCaml. Alternatively, you can click the status bar item where lsp writes its excerpt.
<d_bot> <poogle> command 'ocaml.switch-impl-intf' not found
<d_bot> <poogle> looks like none of the ocaml related commands are being found
<d_bot> <poogle> same for 'ocaml restart language server'
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<d_bot> <rgrinberg> Hmm, that's weird. I think you need to open an issue on the bug tracker with some details + screenshots
<d_bot> <poogle> im new to vscode. but i followed the instructions and im not seeing anything on the ocaml-platform github about PATH settings https://github.com/ocamllabs/vscode-ocaml-platform
<d_bot> <poogle> ok
<d_bot> <poogle> @rgrinberg @theangryepicbanana what dictates how vscode finds commands?
<d_bot> <rgrinberg> If the extension is installed, the commands should be registered.
<d_bot> <poogle> is there a list of registered commands?
<d_bot> <rgrinberg> It should be in the package.json for the plugin
<d_bot> <poogle> ok.
<d_bot> <poogle> maybe ill have better luck with the reason ext
<d_bot> <rgrinberg> good luck
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<garfr> Generally when I am using a symbol table in an imperative language, I have AST nodes that refer to the symbol table hold pointers to the entries. Is there a way to do something like this in OCaml? It seems like its in opposition to a functional paradigm, so is there a better way to structure systems like this?
<d_bot> <poogle> @rgrinberg what is your dev environment like? i'm flexible. just trying to find something that makes it a little easier to learn ocaml. my main difficulty is remembering/knowing where to look for various functions. so basically anything with code completion would work for me
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<companion_cube> garfr: no need to be purely functional
<companion_cube> Pointers and hash tables are fair game
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<garfr> companion_cube: I am already using hash tables, but how would I take a pointer to an entry to the builtin Hashtbl type?
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<companion_cube> hum, the entries are private
<companion_cube> why do you want to do that?
<garfr> The alternative is to have the AST carry around the variable name and rehashing it to find the information each time, instead of simply holding a pointer to the table.
<garfr> At least I think so, I am new to all this any way.
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<companion_cube> you can use a record for representing variables?
<companion_cube> `type var = { name: string; info: …}`
<companion_cube> and have the hashtable map strings to vars
<garfr> Thats what I am currently doing, but I have to search the table with teh string every time to get access to the variable info
<companion_cube> well, in the AST you can use `var`, instead of `string`
<companion_cube> map the string to the `var` record at scoping time
<garfr> What do you mean? The hashtable already maps string to the 'var' record, and if I can keep a pointer to a symbol table for all the uses of a variable I only have to hash it in once per use.
<companion_cube> I mean, yes
<companion_cube> personally I use these hashtables only during scoping
<companion_cube> then you can throw them away
<garfr> Do you just give them unique names?
<garfr> And how do you manage register allocation without a symbol table?
<companion_cube> hum, I don't write compilers, more like logic tools
<companion_cube> but I'd say register allocation comes much much later?
<companion_cube> probably you'd have an SSA representation?
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<garfr> Hmm, I want to keep it as a AST for a bit for some optimization and type inference stuff. Converting to a 3 address code style format is certainly a goal, but it might come later. For now I will just hash the variable name in everytime and if it becomes a real performance bottleneck I will get back to the problem.
<companion_cube> anyway, you may want to look at ocamlc's own code
<companion_cube> variables are Ident.t for a good while, which is a (qualified) name + unique integer
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<companion_cube> the integer makes shadowing easy
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<d_bot> <ggole> If you are using `var`s rather than strings then you would have a pass that transforms the AST from one containing `string` names to one containing `var`s, and you do the string lookup in that pass (that is, once).
<d_bot> <ggole> When you need to store info about the variable, for register allocation or whatever other purpose, you can either stash it in the `var` itself or use a mapping from `var` to the info.
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<d_bot> <inkbottle> Ive added the following `package.json` file in a "cloned opium" (I mean verbatim):
<d_bot> <inkbottle> ```jason
<d_bot> <inkbottle> {
<d_bot> <inkbottle> "name": "my-dune-project",
<d_bot> <inkbottle> "version": "1.0.0",
<d_bot> <inkbottle>
<d_bot> <inkbottle> "esy": {
<d_bot> <inkbottle> "build": ["dune build"],
<d_bot> <inkbottle> "buildEnv": {"DUNE_BUILD_DIR": "#{self.target_dir}"}
<d_bot> <inkbottle> },
<d_bot> <inkbottle>
<d_bot> <inkbottle> "dependencies": {
<d_bot> <inkbottle> "@opam/dune": "*",
<d_bot> <inkbottle> "ocaml": "*"
<d_bot> <inkbottle> }
<d_bot> <inkbottle> }```
<d_bot> <inkbottle> Without that file, if I do
<d_bot> <inkbottle> ```bash
<d_bot> <inkbottle> esy install
<d_bot> <inkbottle> esy build
<d_bot> <inkbottle> esy b dune build @install```
<d_bot> <inkbottle> The project is correctly built.
<d_bot> <inkbottle>
<d_bot> <inkbottle> With the file however, I've got errors stating that the dependencies specified in the generated `{opium,rock}.opam` files are not met. So, even though the opam files have been generated, they are not used the way they are when without the `package.json` file.
<d_bot> <inkbottle>
<d_bot> <inkbottle> I want to use this additional `package.json` file, because I want to tweak the specifications provided by `dune-package`.
<d_bot> <inkbottle>
<d_bot> <inkbottle> However, I do not want to "repeat" those specifications.
<d_bot> <Anurag> @inkbottle To override items from the project's existing setup you'd probably need esy's support for sandbox-config overrides
<d_bot> <Anurag> I don't know how well it works with multiple opam files at once though
<d_bot> <Anurag> I haven't used `esy` in a while so I don't know the current state of its support for projects with multiple packages in the source tree
<d_bot> <inkbottle> Yes, I've read about that, but I've difficulties to figure out how it works: For what I understand I could start installing the project w/o additional `package.opam`, which would work, and then, start doing some overrides. But my understanding of the many points is so low, that the trial and error process could last forever.
<d_bot> <inkbottle> I still believe it is possible to have a `package.json` file stating that information should be taken from `dune-project`.
<d_bot> <inkbottle> That is my best bet for the present that it is the way to do it ("This is the way.").
<d_bot> <Anurag> your best bet would be to open issues on esy's repo of ask on the forum at https://discuss.ocaml.org/
<d_bot> <Anurag> In addition, if you don't have a strong reason for esy, maybe use `opam` in the meantime? It works well for the usecase you describe.
<d_bot> <Anurag> most github repos i've seen where people use `esy` for regular ocaml projects, they end up duplicating the dependencies in both the opam file and the package.json
<d_bot> <inkbottle> Duplicating dependencies seems like very bad practice.
<d_bot> <inkbottle> I've come to esy because it allows replacing opam dependency with github version of it.
<d_bot> <inkbottle> And there are other things that seem convenient too.
<d_bot> <inkbottle> And if you start from a dune project, everything work out of the box.
<d_bot> <inkbottle> Only thing here, I want to tweak it. I'll figure it out, or I will open an issue, stating just the lengthy specifics of my question.
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<d_bot> <inkbottle> I think I have s simple an universal instance of the question:
<d_bot> <inkbottle> ```bash
<d_bot> <inkbottle> git clone https://github.com/rgrinberg/opium.git
<d_bot> <inkbottle> cd opium
<d_bot> <inkbottle> esy install
<d_bot> <inkbottle> esy build
<d_bot> <inkbottle> esy b dune build @install```
<d_bot> <inkbottle> And then, on top of it, you additionally want `utop` in the same sandbox.
<d_bot> <inkbottle> And you'd prefer to have it through the addition of a `.json` file, that expresses: "Just do the things that are specified in the `dune-project` file. And when you're done, add `utop` or `ocaml-lsp-server` to the mix."
<d_bot> <inkbottle> And also, since the `.opam` files are generated from the `dune-project` file, how can I do without, the `.opam` files, from the very start of the process? (Try to remove them and see if you can install anything at all.)
<d_bot> <inkbottle> And thanks for pointing me https://dicuss.ocaml.org
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<d_bot> <inkbottle> "Good examples of dev-dependency is `@opam/ocaml-lsp-server`" in https://esy.sh/docs/en/concepts.html#development-time-dependency
<d_bot> <inkbottle> "Almost every esy command operates in context of a project sandbox which is defined by a sandbox manifest (usually `package.json` but `esy.json` is also supported)." in https://esy.sh/docs/en/how-it-works.html. But in the case described above there is no manifest (in the form of a `package.json` file). Which for instance is required if you want to override it. Quite a conundrum.
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<Anarchos> dune 2.7 with ocaml 4.11.1 is really faster to compile than dune 2.2 with ocaml 4.08 !!
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<Anarchos> how to debug a project with dune ?
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<d_bot> <Aram> I have read the original papers/documents describing effect handlers in OCaml. Back that, effect handlers were dynamically typed. I have read more recently that this idea was abandoned and the new effect handlers will be statically typed. Is there any kind of document describing this?
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<Anarchos> try h x with e -> (Printexc.print_backtrace stdout;flush stdout;1) doesn't print any backtrace
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<zozozo> Anarchos: does h raise an exception ?
<zozozo> ah, also, you need backtraces to be enabled, that means building your project with the "-g" option (which is used by default by dune)
<zozozo> you can check whetehr backtraces are enabled using Printexc.backtrace_status and Printexc.record_backtrace
<Anarchos> zozozo i compile iwth dune
<Anarchos> zozozo ok, in toplevel with record_backtrace, it works
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<Anarchos> zozozo with dune too, i had to call record_backtrace (even if i compile with dune)
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<zozozo> Anarchos: yes, you either have to call record_backtrace, or have "b" in OCAMLRUNPARAM when running the program
<Anarchos> zozozo but i compile with dune...
<zozozo> you nedd both: the "-g" option when compiling so that the compiler inserts the correct code when raising to make it able to record the backtrace, *and* the runtime indication to actually record them
<Anarchos> zozozo ok ok
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<Anarchos> in ocamldebug, how to skip the loading of stdlib to go straight to the loading of the module i want to debug ?
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<d_bot> <EduardoRFS> add a breakpoint
<d_bot> <EduardoRFS> does someone know a way to debug the vscode-ocaml-platform extension? ocamllsp is crashing but it doesn't say way
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<d_bot> <poogle> @EduardoRFS my attempt to get it working kept failing because it could not find any of the ocaml-platform commands. did you have that issue at all?
<d_bot> <EduardoRFS> It's not that for me, if it cannot find the ocaml-platform commands is probably your esy / opam local switch not configured or ocaml-lsp-server not installed
<d_bot> <EduardoRFS> but I found it `"ocaml.trace.server": "messages"`
<d_bot> <poogle> what do you mean by 'opam local switch not configured'? i only have one switch at the moment and `opam list` shows that ocaml-lsp-server is installed. also, `which ocamllsp` shows that it is in my .opam dir
<d_bot> <EduardoRFS> @poogle did you select it in the list?
<d_bot> <poogle> @EduardoRFS which list?
<d_bot> <EduardoRFS> the list of opam switches on the extension
<d_bot> <Ulugbek> you probably have this button in the extension;
<d_bot> <Ulugbek> if you click on it, you get a list of opam and esy sandboxes
<d_bot> <poogle> is that found in the extension settings?
<d_bot> <poogle> ok, checking now
<d_bot> <Ulugbek> bottom of the screen
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<d_bot> <poogle> clicking it fails with 'command `ocaml.select-sandbox`' not found
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<d_bot> <poogle> i see a sandbox setting in the extensions settings. but had not seen it mentioned in the various install tutorials ive read
<d_bot> <poogle> so it's necessary to define a sandbox?
<d_bot> <Ulugbek> > I'm not familiar with using ocaml-lsp with wsl debian, but based on the errors you mention, it seems they come from the OCaml Platform vscode extension rather than ocaml-lsp (or absence of ocaml-lsp corrupts the extension's state, which is also a possibility).
<d_bot> <Ulugbek> >
<d_bot> <Ulugbek> > Could you give us versions of the extension and ocaml-lsp that you have installed, the exact error messages you see and what's shown in "output" pane of vscode for "OCaml Platform" and "ocaml language server"? (you can create an issue [here](https://github.com/ocamllabs/vscode-ocaml-platform/issues)
<d_bot> <Ulugbek> >
<d_bot> <Ulugbek> > A quick fix can be just to launch vscode from the command line from the root of your project, but again I'm not very familiar with wsl.
<d_bot> <Ulugbek> This answer to a post may help ^
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<d_bot> <poogle> ok
<d_bot> <rgrinberg> I don't think it has much to do with opam switches or esy. The commands are defined entirely within the extension. My suspicion is that it's a bug in the plugin or some sort of borked installation.
<d_bot> <EduardoRFS> oh, mb is by far the biggest problem
<d_bot> <poogle> what info/screenshots should i include in a post about this issue?
<d_bot> <poogle> versions of ocaml, opam, ocaml-lsp-server and vscode, a screenshot of the vscode missing command msg. anything else?
<d_bot> <rgrinberg> You only need a version of the plugin + the screen shot.
<d_bot> <rgrinberg> The versions of ocaml, opam, and ocaml-lsp-server do not matter.
<d_bot> <poogle> and post it to the extensions github issues page/
<d_bot> <poogle> ?
<d_bot> <rgrinberg> Or here
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<d_bot> <rgrinberg> Try another command like `OCaml: Restart Language Server`. What happens then?
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<d_bot> <rgrinberg> Also, go to Help > Toggle Developer Tools and then paste any errors from the console
<d_bot> <poogle> @rgrinberg same error for all of the ocaml-platform cmds as far i can tell
<d_bot> <poogle> ok
<d_bot> <poogle> notificationsAlerts.ts:40 command 'ocaml.select-sandbox' not found
<d_bot> <poogle> onDidChangeNotification @ breadcrumbsModel.ts:39
<d_bot> <poogle> notificationsAlerts.ts:40 Command 'OCaml: Restart Language Server' resulted in an error (command 'ocaml.server.restart' not found)
<d_bot> <poogle> onDidChangeNotification @ breadcrumbsModel.ts:39
<d_bot> <poogle> log.ts:197 ERR No application in the Launch Services database matches the input criteria.: Error: No application in the Launch Services database matches the input criteria.
<d_bot> <rgrinberg> try restarting vscode and then seeing the log again
<d_bot> <rgrinberg> Also, what other extensions do you have installed?
<d_bot> <poogle> vscode-elixir is the only other extension currently installed
<d_bot> <poogle> think it would help if i uninstalled it?
<d_bot> <rgrinberg> It's worth trying.
<d_bot> <rgrinberg> Wait, I mean reinstalling the ocaml extension
<d_bot> <rgrinberg> uninstalling the elixir extension doesn't seem useful
<d_bot> <poogle> Boom!
<d_bot> <poogle> looks like a restart did the job!
<d_bot> <poogle> fwiw, i've uninstalled and installed the extension several times in the past. but this is the first time i've done a full 'quit'
<d_bot> <poogle> so when is a restart necessary?
<d_bot> <rgrinberg> Never. I think we have crappy code that needs fixing
<d_bot> <rgrinberg> I'm taking a look
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<d_bot> <poogle> well that was a pretty demoralizing experience for a bit there..."i can't even get an extension working that is supposed to be a breeze to install...maybe ocaml isn't for me"
<d_bot> <poogle> back to loving ocaml again though.
<d_bot> <poogle> thanks for the help!
<d_bot> <rgrinberg> Nah, thanks for sticking with it. I think I know what the bug is btw. So we should fix it shortly.
<d_bot> <poogle> I'm interested in know what caused this and how it's fixed. How can I best track this. Will there be a listing in the issues page on github?
<d_bot> <poogle> Or just watch the pull requests?
<d_bot> <rgrinberg> I'll cc you
<d_bot> <poogle> awesome
<d_bot> <mnxn> I'm not sure if this is the same bug, but if I manually edit the `setting.json` to this, I get the same error messages.
<d_bot> <mnxn> ```json
<d_bot> <mnxn> { "ocaml.sandbox": { "kind": "opam", "switch": "" } }
<d_bot> <mnxn> ```
<d_bot> <rgrinberg> @mnxn it's the `Extension_instance.t` refactoring
<d_bot> <rgrinberg> Can you see the bug? :)
<d_bot> <rgrinberg> ```
<d_bot> <rgrinberg> let make sandbox =
<d_bot> <rgrinberg> let sandbox_info = Sandbox_info.make sandbox in
<d_bot> <rgrinberg> let open Promise.Result.Syntax in
<d_bot> <rgrinberg> let+ client, ocaml_lsp = start_language_server sandbox in
<d_bot> <rgrinberg> { sandbox; client; ocaml_lsp; sandbox_info }
<d_bot> <rgrinberg> ```
<d_bot> <mnxn> Don't worry we'll fix it soon
<d_bot> <mnxn> Yeah looks like if the sandbox setup fails it doesn't create an instance, but does create the statusbar item, which is misleading since clicking on it won't do anything.
<d_bot> <rgrinberg> Yup
<d_bot> <Cyclomatic Complexity> ~~I am getting `command ocamllsp not found` in VsCode~~
<d_bot> <Cyclomatic Complexity> Currently reinstalling the extension
<d_bot> <rgrinberg> Don't bother reinstalling. That's not the issue. We'll push an update today
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<d_bot> <poogle> @mnxn @rgrinberg quickest bug fix ever
<d_bot> <Cyclomatic Complexity> @rgrinberg Ok, I thought I had my new install wrong as it worked a few days ago on some others
<d_bot> <Cyclomatic Complexity> big thx for your work
<d_bot> <rgrinberg> np guys. thanks for your persistence.
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<d_bot> <inkbottle> I came with the following solution to my `esy` `opam` `dune` with `ocaml-lsp-server` problem.
<d_bot> <inkbottle> ```bash
<d_bot> <inkbottle> git clone https://github.com/rgrinberg/opium.git
<d_bot> <inkbottle> cd opium
<d_bot> <inkbottle> git checkout cc66bde8f8db
<d_bot> <inkbottle> cat > package.json << 'EOF'
<d_bot> <inkbottle> {
<d_bot> <inkbottle> "name": "opium",
<d_bot> <inkbottle> "dependencies": {
<d_bot> <inkbottle> "@opam/opium": "*",
<d_bot> <inkbottle> "@opam/rock": "*",
<d_bot> <inkbottle> "@opam/opium-testing": "*",
<d_bot> <inkbottle> "@opam/fmt": "*",
<d_bot> <inkbottle> "@opam/ppx_yojson_conv": "*",
<d_bot> <inkbottle> "@opam/ppx_sexp_conv": "*"
<d_bot> <inkbottle> },
<d_bot> <inkbottle> "devDependencies": {
<d_bot> <inkbottle> "@opam/utop": "*",
<d_bot> <inkbottle> "@opam/ppx_deriving": "*",
<d_bot> <inkbottle> "@opam/ocaml-lsp-server": "*"
<d_bot> <inkbottle> },
<d_bot> <inkbottle> "resolutions": {
<d_bot> <inkbottle> "@opam/opium": "link:./opium.opam",
<d_bot> <inkbottle> "@opam/rock": "link:./rock.opam",
<d_bot> <inkbottle> "@opam/opium-testing": "link:./opium-testing.opam"
<d_bot> <inkbottle> }
<d_bot> <inkbottle> }
<d_bot> <inkbottle> EOF
<d_bot> <inkbottle> esy
<d_bot> <inkbottle> ```
<d_bot> <inkbottle>