Why?

To be able to read complete Rust compiler diagnostics in Neovim with proper colors and formatting, similar to how they appear when running cargo in the terminal.

Installation

lazy.nvim

{
  "alexpasmantier/krust.nvim",
  ft = "rust",
}

packer.nvim

use {
  "alexpasmantier/krust.nvim",
  ft = "rust",
}

Configuration

Krust automatically configures rust-analyzer to send colored diagnostics. No keybindings are set by default to avoid conflicts.

-- With lazy.nvim
{
  "alexpasmantier/krust.nvim",
  ft = "rust",
  opts = {
    keymap = "<leader>k",  -- Set a keymap for Rust buffers (default: false)
    float_win = {
      border = "rounded",    -- Border style: "none", "single", "double", "rounded", "solid", "shadow"
      auto_focus = false,    -- Auto-focus float (default: false)
    },
  },
}

Note: If rust-analyzer starts before krust.nvim loads, you may need :LspRestart for colors to appear. To avoid this, load krust.nvim before your LSP config.

Usage

Use the command:

:Krust

Or call from Lua:

require('krust').render()

Behavior

Krust tries to behave like LSP hover documentation windows:

• First invocation: Opens the floating window (not focused)
• Second invocation: Enters the floating window so you may scroll
• q or <Esc>: Closes the window

Credits

This was inspired by rustaceanvim's diagnostic rendering.