dotfiles/nvim/after/plugin/lsp.lua

require("mason").setup()
require("mason-lspconfig").setup()

local capabilities = vim.lsp.protocol.make_client_capabilities()
capabilities = require('cmp_nvim_lsp').default_capabilities(capabilities)

local on_attach = function(_, bufnr)
  local nmap = function(keys, func, desc)
    if desc then
      desc = 'LSP: ' .. desc
    end

    vim.keymap.set('n', keys, func, { buffer = bufnr, desc = desc })
  end

  nmap('<leader>rn', vim.lsp.buf.rename, '[R]e[n]ame')
  nmap('<leader>ca', vim.lsp.buf.code_action, '[C]ode [A]ction')

  nmap('gd', require('telescope.builtin').lsp_definitions, '[G]oto [D]efinition')
  nmap('gr', require('telescope.builtin').lsp_references, '[G]oto [R]eferences')
  nmap('gI', require('telescope.builtin').lsp_implementations, '[G]oto [I]mplementation')
  nmap('<leader>D', require('telescope.builtin').lsp_type_definitions, 'Type [D]efinition')
  nmap('<leader>ds', require('telescope.builtin').lsp_document_symbols, '[D]ocument [S]ymbols')
  nmap('<leader>ws', require('telescope.builtin').lsp_dynamic_workspace_symbols, '[W]orkspace [S]ymbols')

  -- See `:help K` for why this keymap
  nmap('K', vim.lsp.buf.hover, 'Hover Documentation')
  nmap('<C-k>', vim.lsp.buf.signature_help, 'Signature Documentation')

  -- Lesser used LSP functionality
  nmap('gD', vim.lsp.buf.declaration, '[G]oto [D]eclaration')
  nmap('<leader>wa', vim.lsp.buf.add_workspace_folder, '[W]orkspace [A]dd Folder')
  nmap('<leader>wr', vim.lsp.buf.remove_workspace_folder, '[W]orkspace [R]emove Folder')
  nmap('<leader>wl', function()
    print(vim.inspect(vim.lsp.buf.list_workspace_folders()))
  end, '[W]orkspace [L]ist Folders')

  -- Create a command `:Format` local to the LSP buffer
  vim.api.nvim_buf_create_user_command(bufnr, 'Format', function(_)
    if vim.lsp.buf.format then
      vim.lsp.buf.format()
    elseif vim.lsp.buf.formatting then
      vim.lsp.buf.formatting()
    end
  end, { desc = 'Format current buffer with LSP' })
end

require("mason-lspconfig").setup_handlers({
  function (server_name) -- default handler (optional)
    if server_name == 'sumneko_lua' then
      require("lspconfig")[server_name].setup {
        capabilities = capabilities,
        on_attach = on_attach,
        settings = {
          Lua = {
            diagnostics = {
              globals = {'vim'}
            },
            runtime = {
              version = "LuaJIT",
              path = vim.split(package.path, ";")
            },
            workspace = {
              library = {
                [vim.fn.expand("$VIMRUNTIME/lua")] = true,
                [vim.fn.expand("$VIMRUNTIME/lua/vim/lsp")] = true
              }
            }
          }
        },
      }
    else
      require("lspconfig")[server_name].setup {
        capabilities = capabilities,
        on_attach = on_attach,
      }
    end
  end,
})

require('mason-nvim-dap').setup()


local rt_config = {
    server = {
        on_attach = on_attach,
        settings = {
            ["rust-analyzer"] = {
                checkOnSave = {
                    command = "clippy"
                },
            },
        }
    },
}

require('rust-tools').setup(rt_config)

-- LSP Diagnostics Options Setup 
local sign = function(opts)
  vim.fn.sign_define(opts.name, {
    texthl = opts.name,
    text = opts.text,
    numhl = ''
  })
end

sign({name = 'DiagnosticSignError', text = ''})
sign({name = 'DiagnosticSignWarn', text = ''})
sign({name = 'DiagnosticSignHint', text = ''})
sign({name = 'DiagnosticSignInfo', text = ''})

vim.diagnostic.config({
    virtual_text = false,
    signs = true,
    update_in_insert = true,
    underline = true,
    severity_sort = false,
    float = {
        border = 'rounded',
        source = 'always',
        header = '',
        prefix = '',
    },
})

vim.cmd([[
autocmd CursorHold * lua vim.diagnostic.open_float(nil, { focusable = false })
]])


require('nvim-lightbulb').setup({autocmd = {enabled = true}})