Requirements

Neovim >= v0.6.1
A language server with selection range capabilities

Installation

Use your favorite package manager as usual.

Configuration

First you must update the LSP client capabilities to let the servers know that it can handle selection range feature. And then you need to configure a mapping to visually select accordingly to your server response.

Using nvim-lsp-config

local nvim_lsp = require('lspconfig')
local lsp_selection_range = require('lsp-selection-range')

-- Update existing capabilities
capabilities = lsp_selection_range.update_capabilities(capabilities)

-- If you don't already have custom capabilities you can simply do
local capabilities = lsp_selection_range.update_capabilities({})

local on_attach = function(client, bufnr)
  local bmap = function(mode, lhs, rhs, options)
    options = options or {}

    vim.api.nvim_buf_set_keymap(bufnr, mode, lhs, rhs, options)
  end

  -- Put here any configuration to execute when attaching a client to a buffer

  -- Create mappings to trigger or expand the selection
  bmap('n', 'vv', [[<cmd>lua require('lsp-selection-range').trigger()<CR>]], { noremap = true })
  bmap('v', 'vv', [[<cmd>lua require('lsp-selection-range').expand()<CR>]], { noremap = true })
end

nvim_lsp['your-server-name'].setup({
  capabilities = capabilities,
  on_attach = on_attach,
  -- Put here your server configuration as usual
})

Caching the choice of client per filetype

When you have more than one server offering the selection range feature you'll be asked to choose which one to use every time you want to select something. This can quickly be annoying, to help you with that you can add a little bit of configuration to setup the plugin accordingly:

local lsp_selection_range = require('lsp-selection-range')
local lsr_client = require('lsp-selection-range.client')

lsp_selection_range.setup({
  get_client = lsr_client.select_by_filetype(lsr_client.select)
})

You can provide to get_client any function with the following signature func(): Client|nil.

The lsr_client.select is the default implementation used by this plugin:

If no client supports the feature: returns nil
If only one client supports the feature: returns it
If more than one client support the feature: will ask you to choose using vim.select UI

The lsr_client.select_by_filetype will create a wrapper around any function returning a client and memorized the returned client for each filetype.

Documentation