nvim/lua/lsputils.lua

if vim.fn.has('nvim-0.5.1') == 1 then
    vim.lsp.handlers['textDocument/codeAction'] = require'lsputil.codeAction'.code_action_handler
    vim.lsp.handlers['textDocument/references'] = require'lsputil.locations'.references_handler
    vim.lsp.handlers['textDocument/definition'] = require'lsputil.locations'.definition_handler
    vim.lsp.handlers['textDocument/declaration'] = require'lsputil.locations'.declaration_handler
    vim.lsp.handlers['textDocument/typeDefinition'] = require'lsputil.locations'.typeDefinition_handler
    vim.lsp.handlers['textDocument/implementation'] = require'lsputil.locations'.implementation_handler
    vim.lsp.handlers['textDocument/documentSymbol'] = require'lsputil.symbols'.document_handler
    vim.lsp.handlers['workspace/symbol'] = require'lsputil.symbols'.workspace_handler
else
    local bufnr = vim.api.nvim_buf_get_number(0)

    vim.lsp.handlers['textDocument/codeAction'] = function(_, _, actions)
        require('lsputil.codeAction').code_action_handler(nil, actions, nil, nil, nil)
    end

    vim.lsp.handlers['textDocument/references'] = function(_, _, result)
        require('lsputil.locations').references_handler(nil, result, { bufnr = bufnr }, nil)
    end

    vim.lsp.handlers['textDocument/definition'] = function(_, method, result)
        require('lsputil.locations').definition_handler(nil, result, { bufnr = bufnr, method = method }, nil)
    end

    vim.lsp.handlers['textDocument/declaration'] = function(_, method, result)
        require('lsputil.locations').declaration_handler(nil, result, { bufnr = bufnr, method = method }, nil)
    end

    vim.lsp.handlers['textDocument/typeDefinition'] = function(_, method, result)
        require('lsputil.locations').typeDefinition_handler(nil, result, { bufnr = bufnr, method = method }, nil)
    end

    vim.lsp.handlers['textDocument/implementation'] = function(_, method, result)
        require('lsputil.locations').implementation_handler(nil, result, { bufnr = bufnr, method = method }, nil)
    end

    vim.lsp.handlers['textDocument/documentSymbol'] = function(_, _, result, _, bufn)
        require('lsputil.symbols').document_handler(nil, result, { bufnr = bufn }, nil)
    end

    vim.lsp.handlers['textDocument/symbol'] = function(_, _, result, _, bufn)
        require('lsputil.symbols').workspace_handler(nil, result, { bufnr = bufn }, nil)
    end
  end