Integrated Language Server (nushell#10723)

# Description

This commit integrates a language server into nushell so that IDEs don't
have to convert CLI option back and forth.

- fixes nushell/vscode-nushell-lang#117
- fixes jokeyrhyme/nuls#8

Tracking tasks


- [x]
[textDocument/hover](https://microsoft.github.io/language-server-protocol/specifications/lsp/3.17/specification/#textDocument_hover)
-> `nu --ide-hover`
- [x]
[textDocument/completion](https://microsoft.github.io/language-server-protocol/specifications/lsp/3.17/specification/#textDocument_completion)
-> `nu --ide-complete`
- [x]
[textDocument/definition](https://microsoft.github.io/language-server-protocol/specifications/lsp/3.17/specification/#textDocument_definition)
-> `nu --ide-goto-def`
- ~~[ ]
[textDocument/didChange](https://microsoft.github.io/language-server-protocol/specifications/lsp/3.17/specification/#textDocument_didChange),
[textDocument/didClose](https://microsoft.github.io/language-server-protocol/specifications/lsp/3.17/specification/#textDocument_didClose),
and
[textDocument/didOpen](https://microsoft.github.io/language-server-protocol/specifications/lsp/3.17/specification/#textDocument_didOpen)~~
(will be done in a follow-up PR)
- ~~[ ]
[textDocument/inlayHint](https://microsoft.github.io/language-server-protocol/specifications/lsp/3.17/specification/#textDocument_inlayHint)
-> `nu --ide-check`~~ (will be done in a follow-up PR)
- ~~[ ]
[textDocument/publishDiagnostics](https://microsoft.github.io/language-server-protocol/specifications/lsp/3.17/specification/#textDocument_publishDiagnostics)
-> `nu --ide-check`~~ (will be done in a follow-up PR)
- ~~[ ]
[workspace/configuration](https://microsoft.github.io/language-server-protocol/specifications/lsp/3.17/specification/#workspace_configuration)~~
(will be done in a follow-up PR)
- ~~[ ]
[workspace/didChangeConfiguration](https://microsoft.github.io/language-server-protocol/specifications/lsp/3.17/specification/#workspace_didChangeConfiguration)~~
(will be done in a follow-up PR)


# User-Facing Changes

The command line options `--lsp` will start a LSP server.

# Tests + Formatting
<!--
Don't forget to add tests that cover your changes.

Make sure you've run and fixed any issues with these commands:

- `cargo fmt --all -- --check` to check standard code formatting (`cargo
fmt --all` applies these changes)
- `cargo clippy --workspace -- -D warnings -D clippy::unwrap_used` to
check that you're using the standard code style
- `cargo test --workspace` to check that all tests pass (on Windows make
sure to [enable developer
mode](https://learn.microsoft.com/en-us/windows/apps/get-started/developer-mode-features-and-debugging))
- `cargo run -- -c "use std testing; testing run-tests --path
crates/nu-std"` to run the tests for the standard library

> **Note**
> from `nushell` you can also use the `toolkit` as follows
> ```bash
> use toolkit.nu # or use an `env_change` hook to activate it
automatically
> toolkit check pr
> ```
-->

# After Submitting
<!-- If your PR had any user-facing changes, update [the
documentation](https://github.com/nushell/nushell.github.io) after the
PR is merged, if necessary. This will help us keep the docs up to date.
-->

Cargo.toml

@@ -33,6 +33,7 @@ members = [
 	"crates/nu-cmd-lang",
 	"crates/nu-cmd-dataframe",
 	"crates/nu-command",
+	"crates/nu-lsp",
 	"crates/nu-protocol",
 	"crates/nu-plugin",
 	"crates/nu_plugin_inc",
@@ -56,6 +57,7 @@ nu-command = { path = "./crates/nu-command", version = "0.86.1" }
 nu-engine = { path = "./crates/nu-engine", version = "0.86.1" }
 nu-explore = { path = "./crates/nu-explore", version = "0.86.1" }
 nu-json = { path = "./crates/nu-json", version = "0.86.1" }
+nu-lsp = { path = "./crates/nu-lsp/", version = "0.86.1" }
 nu-parser = { path = "./crates/nu-parser", version = "0.86.1" }
 nu-path = { path = "./crates/nu-path", version = "0.86.1" }
 nu-plugin = { path = "./crates/nu-plugin", optional = true, version = "0.86.1" }

crates/nu-lsp/Cargo.toml

@@ -0,0 +1,29 @@
+[package]
+authors = ["The Nushell Project Developers"]
+description = "Nushell's integrated LSP server"
+repository = "https://github.com/nushell/nushell/tree/main/crates/nu-lsp"
+name = "nu-lsp"
+version = "0.86.1"
+edition = "2021"
+license = "MIT"
+
+[dependencies]
+nu-cli = { path = "../nu-cli", version = "0.86.1" }
+nu-parser = { path = "../nu-parser", version = "0.86.1" }
+nu-protocol = { path = "../nu-protocol", version = "0.86.1" }
+reedline = { version = "0.25" }
+
+lsp-types = "0.94.1"
+lsp-server = "0.7.4"
+miette = "5.10"
+ropey = "1.6.1"
+serde = "1.0"
+serde_json = "1.0"
+
+[dev-dependencies]
+nu-cmd-lang = { path = "../nu-cmd-lang", version = "0.86.1" }
+nu-command = { path = "../nu-command", version = "0.86.1" }
+nu-test-support = { path = "../nu-test-support", version = "0.86.1" }
+
+assert-json-diff = "2.0"
+tempfile = "3.2"

crates/nu-lsp/LICENSE

@@ -0,0 +1,28 @@
+The MIT License (MIT)
+
+Copyright (c) 2014 The Rust Project Developers
+Copyright (c) 2020-2023 The Nushell Project Developers
+
+Permission is hereby granted, free of charge, to any
+person obtaining a copy of this software and associated
+documentation files (the "Software"), to deal in the
+Software without restriction, including without
+limitation the rights to use, copy, modify, merge,
+publish, distribute, sublicense, and/or sell copies of
+the Software, and to permit persons to whom the Software
+is furnished to do so, subject to the following
+conditions:
+
+The above copyright notice and this permission notice
+shall be included in all copies or substantial portions
+of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF
+ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED
+TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
+PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT
+SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR
+IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+DEALINGS IN THE SOFTWARE.