Fork of Nushell with a generic LSP client for showing real-time diagnostics. Intended to use with nu-lint but could be used with any other LSP server.

Disclaimer: This fork was made to make it easier for people to experiment with inline diagnostics in the terminal for Nushell. As far as I know this is not too common yet. For the most-up-to date mainline Nushell features and development, please refer to the original repository. Otherwise, go ahead and play around with this fork.

Features:

• Multiple underlined spans
• Inline hints under spans
• Colors for warning / info / error level
• Automatic fixes (for most rules)
• User / workspace ignore action (for noisy rules)

Screenshot of inline diagnostics with multiple labels:

Screenshot of the code action menu being active and suggesting fixes:

flowchart LR
    subgraph Terminal
        Nu[nu binary]
        Reedline[reedline fork]
    end
    subgraph LSP Server
        NuLint[nu-lint]
    end

    Nu -->|line editing| Reedline
    Reedline <-->|LSP protocol| NuLint
    NuLint -->|diagnostics, fixes| Reedline

The forked reedline adds an LSP client that communicates with any language server specified via $env.REEDLINE_LS. The LSP server analyzes input and returns diagnostics and code actions displayed inline.

Install a language protocol server (LSP server). I recommend nu-lint:

cargo install nu-lint

Build the main binary nu with a Rust compiler toolchain:

• For Nix users: nix run . (or add this repo's flake to your system dependencies)
• Otherwise, if you are on a more mainstream machine, install rustup and:

cargo install --git https://github.com/wvhulle/nushell

Keep in mind this will overwrite any other nu binary you have there (such as the official one).

Set the environment variable with the startup command for the language server:

$env.REEDLINE_LS = "nu-lint --lsp"
# Or any other LSP server command you like
# $env.REEDLINE_LS = "nu --lsp"

Run the shell: ~/.cargo/bin/nu (or add to your path)

Key bindings:

• Open fix/ignore menu when a violation is detected with ctrl+..
• Navigate between fixes and ignore actions: tab
• Apply fix directly in the prompt: enter

You can file issues related to incorrect lints and fixes at nu-lint.