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path: root/lua/config/lsp/handlers.lua
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-- Handler for LSP servers.

local M = {}

-- TODO: backfill this to template
M.setup = function()
  local signs = {
    { name = "DiagnosticSignError", text = "" },
    { name = "DiagnosticSignWarn", text = "" },
    { name = "DiagnosticSignHint", text = "" },
    { name = "DiagnosticSignInfo", text = "" },
  }

  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_text = false,
    -- show signs
    signs = {
      active = signs,
    },
    update_in_insert = true,
    underline = true,
    severity_sort = true,
    float = {
      focusable = false,
      style = "minimal",
      border = "rounded",
      source = "always",
      header = "",
      prefix = "",
    },
  }

  vim.diagnostic.config(config)

  vim.lsp.handlers["textDocument/hover"] = vim.lsp.with(vim.lsp.handlers.hover, {
    border = "rounded",
  })

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

local function lsp_highlight_document(client)
  -- Set autocommands conditional on server_capabilities
  if client.resolved_capabilities.document_highlight then
    vim.api.nvim_exec(
      [[
      let ftToIgnore = ['html']
      augroup lsp_document_highlight
        autocmd! * <buffer>
        autocmd CursorHold <buffer> if index(ftToIgnore, &ft) < 0 | lua vim.lsp.buf.document_highlight()
        autocmd CursorMoved <buffer> if index(ftToIgnore, &ft) < 0 | lua vim.lsp.buf.clear_references()
      augroup END
    ]],
      false
    )
  end
end
local function lsp_keymaps(bufnr)
  local opts = { noremap = true, silent = true }
  vim.api.nvim_buf_set_keymap(
    bufnr,
    "n",
    "gD",
    "<cmd>lua vim.lsp.buf.declaration()<CR>",
    opts
  )
  vim.api.nvim_buf_set_keymap(
    bufnr,
    "n",
    "gd",
    "<cmd>lua vim.lsp.buf.definition()<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>lua vim.lsp.buf.implementation()<CR>",
    opts
  )
  -- vim.api.nvim_buf_set_keymap(bufnr, "n", "<C-k>", "<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",
    "gr",
    "<cmd>lua vim.lsp.buf.references()<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",
    "gl",
    "<cmd>lua vim.diagnostic.open_float()<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.formatting()' ]]
end

M.on_attach = function(client, bufnr)
  if client.name == "tsserver" then
    client.resolved_capabilities.document_formatting = false
  end
  lsp_keymaps(bufnr)
  lsp_highlight_document(client)
end

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

local status_ok, cmp_nvim_lsp = pcall(require, "cmp_nvim_lsp")
if not status_ok then
  return
end

M.capabilities = cmp_nvim_lsp.update_capabilities(capabilities)

function M.enable_format_on_save()
  vim.cmd [[
    augroup format_on_save
      autocmd! 
      autocmd BufWritePre * lua vim.lsp.buf.formatting()
    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