Spellwarn.nvim

This is a plugin to display spelling errors as diagnostics. Some language servers offer this as a feature, but they have several issues:

By finding spelling separately from Neovim, they don't respect options like spellfile or spelllang.
Their spelling mistakes don't align with Neovim's, which is a source of inconsistency.
You can't use the default keybindings to add words to your spellfile.
Neovim spelling works in nearly all filetypes, and is context-aware with Treesitter, whereas language servers like ltex only work for specific languages.

A simpler solution, therefore, is to use Neovim's existing spellchecking and diagnostics features. This is done by iterating through the flagged words in a buffer and passing them to vim.diagnostic.set(). Neovim is fast enough that this is ~instantaneous for most files. See below for installation and configuration instructions.

Installation

I recommend using Lazy.nvim:

{
    "ravibrock/spellwarn.nvim",
    event = "VeryLazy",
    config = true,
}

Note that this uses Neovim's built-in spellchecking. This requires putting vim.opt.spell = true and vim.opt.spelllang = [YOUR LANGUAGE HERE] somewhere in your Neovim config if you haven't already. You may also want to add the word "spellwarn" to your Neovim dictionary. This can be done by putting the cursor onto "spellwarn" and hitting zg.

Configuration

Pass any of the following options to require("spellwarn").setup():

{
    event = { -- event(s) to refresh diagnostics on
        "CursorHold",
        "InsertLeave",
        "TextChanged",
        "TextChangedI",
        "TextChangedP",
    },
    enable = true, -- enable diagnostics on startup
    ft_config = { -- spellcheck method: "cursor", "iter", or boolean
        alpha   = false,
        help    = false,
        lazy    = false,
        lspinfo = false,
        mason   = false,
    },
    ft_default = true, -- default option for unspecified filetypes
    max_file_size = nil, -- maximum file size to check in lines (nil for no limit)
    severity = { -- severity for each spelling error type (false to disable diagnostics for that type)
        spellbad   = "WARN",
        spellcap   = "HINT",
        spelllocal = "HINT",
        spellrare  = "INFO",
    },
    prefix = "possible misspelling(s): ", -- prefix for each diagnostic message
    diagnostic_opts = { severity_sort = true }, -- options for diagnostic display
}

Most options are overwritten (e.g. passing ft_config = { python = false } will mean that alpha, mason, etc. are set to true) but severity and diagnostic_opts are merged, so that (for example) passing { spellbad = "HINT" } won't cause spellcap to be nil. You can pass any of cursor, iter, treesitter, false, or true as options to ft_config. The default method is cursor, which iterates through the buffer with ]s. There is also iter, which uses Treesitter (if available) and the Lua API. Finally, false disables Spellwarn for that filetype and true uses the default (cursor).

Note: iter doesn't show spellcap errors, but works well other than that. I recommend it.

Usage

The plugin should be good to go after installation with the provided snippet. It has sensible defaults. Run :Spellwarn enable, :Spellwarn disable, or :Spellwarn toggle to enable/disable/toggle during runtime (though this will not override max_file_size, ft_config, or ft_default). You can also add keybindings for any of these (one possible usecase would be disabling by default with the enable key of the configuration table and then only enabling when needed). To disable diagnostics on a specific line, add spellwarn:disable-next-line to the line immediately above or spellwarn:disable-line to a comment at the end of the line. To disable diagnostics in a file, add a comment with spellwarn:disable to the first or second line of the file.

Lua API

The Lua API matches the arguments for the Spellwarn command:

require("spellwarn").disable() to disable
require("spellwarn").enable() to enable
require("spellwarn").toggle() to toggle

Contributing

PRs and issues welcome! Please use Conventional Commits if submitting a pull request.

ravibrock / spellwarn.nvim