How to setup lsp for scheme

[Esnos33]

I want to learn scheme with chicken implementation and I wanted to have working lsp for that. Does somebody have working lsp for this scheme? I have found this lsp: https://codeberg.org/rgherdt/scheme-lsp-server#chicken, but after installing I can't make it work. Here is my current languages.toml:

[[language]]
name = "scheme"
language-server = [ "chicken-lsp-server" ]

and my current error is:

Bad language config: invalid length 4, expected struct LanguageServerConfiguration with 5 elements
in `language.language-server`

Press <ENTER> to continue with default language config

[woojiq]

If you look at languages.toml you will find, you need to provide configuration for the language server not only for the language itself.
Like:

[language-server]

awk-language-server = { command = "awk-language-server" }
bash-language-server = { command = "bash-language-server", args = ["start"] }
...

[Esnos33]

Ok, so my config looks now like this:

[language-server.scheme]
command = "chicken-lsp-server"

[[language]]
name = "scheme"

I got this format of languages.toml from here: https://docs.helix-editor.com/master/languages.html
I'm on version 23.05 if that matters
Now I don't have any errors from helix, but I think helix don't see my lsp, because when I run helix --health scheme I got:

 hx --health scheme
Configured language server: None
Configured debug adapter: None
Highlight queries: ✓
Textobject queries: ✘
Indent queries: ✘

but I can run lsp from command promt, so I should have lsp added to path, for example:

~/.c/helix> chicken-lsp-server --help
usage: chicken-lsp-server [--log-level <log-level>] [--socket <port-num>] [--stdio] [--version].
Example: chicken-lsp-server --log-level debug --socket 4222
Arguments:
    --log-level <level>: one of [error, warning, info, debug]. Default: error.
    --stdio <port-num>: use stdio for communication with a client. If stdio and socket are ommitted, stdio is used.
    --socket <port-num>: listen on tcp port <port-num> instead of stdio.
    --help (or -h):    display this help and exit.
    --version (or -v): display version information and exit.

And after creating new file lsp_test.scm and trying to edit there anything I have message "Language server not active for current buffer".
Should I try something else or do you know if there is some problem with my configurations?

[woojiq]

Sorry for not explaining clearly. Normally you don't need to write the lsp configuration in a config file because there are many in languages.toml. But your case is different, if you run hx --health you will see that there is no preconfigured lsp for scheme. This is why you can't just install a binary and everything will work out of the box.
So to work, you need to add an lsp for the scheme ([language]) and also configure this lsp ([language-server]). For example, run ctrl-f + rust in languages.toml, you will see language-servers = [ "rust-analyzer" ] inside [[language]] and a separate language server configuration:

[language-server.rust-analyzer]
command = "rust-analyzer"

In your case I think you will need something like this:

[language-server.chicken-lsp-server]
command = "chicken-lsp-server"
args = [ "--stdio" ]

[[language]]
name = "scheme"
language-servers = [ "chicken-lsp-server" ]

[Esnos33]

I have this weird bug, that says there shouldn't be "s" at the end in "language-servers":

hx lsp_test.scm
Bad language config: unknown field `language-servers`, expected one of `name`, `scope`, `file-types`, `shebangs`, `roots`, `comment-token`, `text-width`, `soft-wrap`, `config`, `auto-format`, `formatter`, `diagnostic-severity`, `grammar`, `injection-regex`, `language-server`, `indent`, `debugger`, `auto-pairs`, `rulers`, `workspace-lsp-roots`
in `language` 

I don't know why it is like that, but even if I change "language-servers" to "language-server" I got this weird error:

hx lsp_test.scm
Bad language config: invalid length 4, expected struct LanguageServerConfiguration with 5 elements
in `language.language-server`

So either way, it doesn't work. Do you know what else I can try?

[woojiq]

Make sure you use the master helix, #2507 introduced the concept of multiple language servers and changed the syntax a bit.

EDIT: if you don't want to install master, try this:

[[language]]
name = "scheme"
language-server = { command = "chicken-lsp-server" }

[Esnos33]

I downloaded master helix (version helix 23.05 (19dff5c)), now config this config:

[language-server.chicken-lsp-server]
command = "chicken-lsp-server"
args = [ "--stdio" ]

[[language]]
name = "scheme"
language-servers = [ "chicken-lsp-server" ]

doesn't create any errors, but after I open my file I have message "Language server exited" in status line. I think this might be just problem with lsp. I will leave it for now and I will try to work with scheme without lsp. I will leave this discussion open, so that if anyone find a way to make it work, please share it here. Thank @woojiq for your help, I learned more about helix thanks to you.

[gabydd]

it seems to be closing instantly I also think I told you the wrong thing for log-level it should be
```args = [ "--log-level", "debug" ]`` instead.

[gabydd]

so when I installed it I didnt follow the install the chicken docs part and it seems like that is making it close instantly, once I do that it doesn't exit anymore I dont get much completion or anything though but that is seperate

[Esnos33]

I must end debugging for today, I will try more things tomorrow.

[gabydd]

ok two things args = [ "--log-level debug" ] does cause the language server to crash each arg has to be separated as shown above, I am actually able to get goto-definition and completion for functions defined in a file but only if it was defined before I opened the file

[Esnos33]

I changed args to looks like gabydd and I have same same behavior. I also saw strange interaction. I created new file in same directory as old file and made there function. After I checked back to old file, I could autocomplete function from new file in old file, without importing or anything. I created two files to show you this behavior, test1 and test2. Put them together is same folder and start typing in parenthesis on line 4 in either file, it should autocomplete to either test1 or test2 function. Due to github, I will send this files in .txt format. Also, here is new log file.
log.txt
test1.txt
test2.txt

[Esnos33]

I filled issue yesterday to owner of scheme-lsp-server and he answered me: https://codeberg.org/rgherdt/scheme-lsp-server/issues/14. He asked me to use lsp in tcp mode and send results to him. I looked up and there is way in helix to interact with an LSP server through TCP, but even after reading I still don't know how can I set it up, can you help me with this?

[woojiq]

Does the info from here (first block) help?

[Esnos33]

I tried to do something like this:

[language-server.chicken-lsp-server]
command = "chicken-lsp-server" 
args = ["--log-level", "debug", "--socket", "6008"]

[[language]]
name = "scheme"
language-servers = [ "chicken-lsp-server" ]

but after that lsp didn't work at all. I really don't understand tcp technology, I don't know how to set up helix correctly.

[DzmingLi]

Is the problem solved now? I also want to setup lsp for scheme🙏