config/.config/nvim/lua/user/lsp/handlers.lua

local M = {}

M.capabilities = vim.lsp.protocol.make_client_capabilities()

local status_cmp_ok, cmp_nvim_lsp = pcall(require, "cmp_nvim_lsp")
if not status_cmp_ok then
  print "cmp_nvim_lsp error!"
  return
end

M.capabilities.textDocument.completion.completionItem.snippetSupport = true
M.capabilities = cmp_nvim_lsp.update_capabilities(M.capabilities)

M.setup = function()
  local icons = require "user.icons"
  local signs = {
    { name = "DiagnosticSignError", text = icons.diagnostics.Error },
    { name = "DiagnosticSignWarn", text = icons.diagnostics.Warning },
    { name = "DiagnosticSignHint", text = icons.diagnostics.Hint },
    { name = "DiagnosticSignInfo", text = icons.diagnostics.Information },
  }

  for _, sign in ipairs(signs) do
    vim.fn.sign_define(sign.name, {
            texthl = sign.name, text = sign.text, numhl = ""
        })
  end

  local config = {
    -- disable virtual text
    virtual_lines = false,
    virtual_text = false,
    -- virtual_text = {
    --   -- spacing = 7,
    --   -- update_in_insert = false,
    --   -- severity_sort = true,
    --   -- prefix = "<-",
    --   prefix = " ●",
    --   source = "if_many", -- Or "always"
    --   -- format = function(diag)
    --   --   return diag.message .. "blah"
    --   -- end,
    -- },

    -- show signs
    signs = {
      active = signs,
    },
    update_in_insert = true,
    underline = true,
    severity_sort = true,
    float = {
      focusable = true,
      style = "minimal",
      border = "rounded",
      -- border = {"▄","▄","▄","█","▀","▀","▀","█"},
      source = "if_many", -- Or "always"
      header = "",
      prefix = "",
      -- width = 40,
    },
  }

  vim.diagnostic.config(config)

  vim.lsp.handlers["textDocument/hover"] =
    vim.lsp.with(vim.lsp.handlers.hover, {
    border = "rounded",
    -- width = 60,
    -- height = 30,
  })

  vim.lsp.handlers["textDocument/signatureHelp"] =
    vim.lsp.with(vim.lsp.handlers.signature_help, {
    border = "rounded",
    -- width = 60,
    -- height = 30,
  })
end

local function attach_navic(client, bufnr)
  vim.g.navic_silence = true
  local status_ok, navic = pcall(require, "nvim-navic")
  if not status_ok then
    print "nvim-navic error!"
    return
  end
  navic.attach(client, bufnr)
end

local function lsp_keymaps(bufnr)
  local opts = { noremap = true, silent = true }
  -- vim.api.nvim_buf_set_keymap(bufnr, "n", "gd", "<cmd>Telescope lsp_definitions<CR>", opts)
  -- vim.api.nvim_buf_set_keymap(bufnr, "n", "gD", "<cmd>Telescope lsp_declarations<CR>", opts)
  -- vim.api.nvim_buf_set_keymap(bufnr, "n", "K", "<cmd>lua vim.lsp.buf.hover()<CR>", opts)
  -- vim.api.nvim_buf_set_keymap(bufnr, "n", "gI", "<cmd>Telescope lsp_implementations<CR>", opts)
  -- vim.api.nvim_buf_set_keymap(bufnr, "n", "gr", "<cmd>Telescope lsp_references<CR>", opts)
  -- vim.api.nvim_buf_set_keymap(bufnr, "n", "gl", "<cmd>lua vim.diagnostic.open_float()<CR>", opts)
  -- vim.api.nvim_buf_set_keymap(bufnr, "n", "gs", "<cmd>lua vim.lsp.buf.signature_help()<CR>", opts)
  -- vim.api.nvim_buf_set_keymap(bufnr, "n", "<M-f>", "<cmd>Format<cr>", opts)
  -- vim.api.nvim_buf_set_keymap(bufnr, "n", "<M-a>", "<cmd>lua vim.lsp.buf.code_action()<cr>", opts)
  -- vim.api.nvim_buf_set_keymap(bufnr, "n", "<M-s>", "<cmd>lua vim.lsp.buf.signature_help()<CR>", opts)
  -- vim.api.nvim_buf_set_keymap(bufnr, "n", "<leader>rn", "<cmd>lua vim.lsp.buf.rename()<CR>", opts)
  -- vim.api.nvim_buf_set_keymap(bufnr, "n", "<leader>ca", "<cmd>lua vim.lsp.buf.code_action()<CR>", opts)
  -- vim.api.nvim_buf_set_keymap(bufnr, "n", "<leader>f", "<cmd>lua vim.diagnostic.open_float()<CR>", opts)
  -- vim.api.nvim_buf_set_keymap(bufnr, "n", "[d", '<cmd>lua vim.diagnostic.goto_prev({ border = "rounded" })<CR>', opts)
  -- vim.api.nvim_buf_set_keymap(bufnr, "n", "]d", '<cmd>lua vim.diagnostic.goto_next({ border = "rounded" })<CR>', opts)
  -- vim.api.nvim_buf_set_keymap(bufnr, "n", "<leader>q", "<cmd>lua vim.diagnostic.setloclist()<CR>", opts)
  -- vim.cmd [[ command! Format execute 'lua vim.lsp.buf.format({ async = true })' ]]
end

M.on_attach = function(client, bufnr)
  lsp_keymaps(bufnr)
  attach_navic(client, bufnr)
end

function M.enable_format_on_save()
  vim.cmd [[
    augroup format_on_save
      autocmd!
      autocmd BufWritePre * lua vim.lsp.buf.format({ async = false })
    augroup end
  ]]
  vim.notify "Enabled format on save"
end

function M.disable_format_on_save()
  M.remove_augroup "format_on_save"
  vim.notify "Disabled format on save"
end

function M.toggle_format_on_save()
  if vim.fn.exists "#format_on_save#BufWritePre" == 0 then
    M.enable_format_on_save()
  else
    M.disable_format_on_save()
  end
end

function M.remove_augroup(name)
  if vim.fn.exists("#" .. name) == 1 then
    vim.cmd("au! " .. name)
  end
end

vim.cmd [[ command! LspToggleAutoFormat execute 'lua require("user.lsp.handlers").toggle_format_on_save()' ]]

return M