lsp-document-highlight.nvim

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lsp-document-highlight.nvim

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Snappy "cursor word" highlighting using modern mechanics for neovim

// repository documentation

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# lsp-document-highlight.nvim

_provides you with the power of the `textDocument.documentHighlight` LSP method in a speedy way_

> [!TIP]  
> [`textDocument.documentHighlight`](https://microsoft.github.io/language-server-protocol/specifications/lsp/3.17/specification/#textDocument_documentHighlight), aka. "cursor word highlighting" or "reference highlighting",
> is the UI feature where all references to the symbol under the cursor are shown using a highlight.

## why does this exist

- instantaneous\*, live updating unlike putting `vim.lsp.buf.document_highlight()` in an autocmd on `CursorHold`

- no performance issues (configurable lsp call throttling) unlike putting `vim.lsp.buf.document_highlight()` in an autocmd on `CursorMoved`

- no flickering (due to slow lsp) when moving within the same symbol unlike any autocmd solution or [`vim-illuminate`](https://github.com/RRethy/vim-illuminate)

- throttling instead of debouncing so updates trigger immediately when possible unlike [`snacks.nvim` words](https://github.com/folke/snacks.nvim/blob/main/docs/words.md)

- also supports navigating between references (see keymapping below).

\*: assuming your lsp is not being slow (\*cough\* \*cough\* `lua_ls`... i've heard typescript lsp is also slow but :shrug: not something i use)

## installation

consult your favorite plugin manager.

this plugin loads itself -- no need to call any setup function.  
this plugin is self-lazy-loading.
(although `setup()` currently triggers loading... but there's so little code anyway)

## configuration

see [config.lua](./lua/lsp-document-highlight/config.lua) for the defaults
and [types.lua](./lua/lsp-document-highlight/types.lua) for annotations on what the keys mean.  
if you have `lua_ls` set up, you can also enjoy autocompletion and
hover documentation in your plugin config
if you annotate the table with the `LDH.config` type.

example setup with keymaps to navigate references (using `lazy.nvim`):

```lua
---@type LazySpec
return {
  {
    "akioweh/lsp-document-highlight.nvim",
    lazy = false,
    keys = {
      {
        "[[",
        function()
          require("lsp-document-highlight").jump(-vim.v.count1, true)
        end,
        desc = "Previous Reference",
      },
      {
        "]]",
        function()
          require("lsp-document-highlight").jump(vim.v.count1, true)
        end,
        desc = "Next Reference",
      },
    },
    ---@type LDH.config
    opts = {
      throttle = 50,
    },
  },
}
```

> [!TIP]  
> passing `vim.v.count1` into `jump` allows one to naturally use vim keycounts to jump multiple references at once.

## lua api

the module is called `lsp-document-highlight`.
require it to access all the public functions (see [the code](./lua/lsp-document-highlight.lua) ).

the only thing of interest now is the `require("lsp-document-highlight").jump(count, wrap)` function:

```lua
--- jumps to the next count-th (or previous if negative) reference
--- @param count number
--- @param wrap? boolean definitely self-explanatory
function M.jump(count, wrap)
  -- ...
end
```

> [!NOTE]  
> if `count` is more than 1 (negative or positive), jumping will never wrap around.
> this, with a keymap setup like above, makes `[[` and `]]` only wrap when a keycount is NOT given;
> any large enough keycount will get you to the first or last reference instead of sending you somewhere random due to wrapping.

call `.enable()` or `.disable()` to do what the function names suggest.  
you can also do this per-buffer by passing a filtering predicate to the `enable.buffer` key in the config.
i recommend storing a flag in `vim.b[]` and have the predicate check the flag :).

---

PS. star pls :)

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