nvim/lua/setup/my_lspconfig.lua

require('mason').setup()
require('mason-lspconfig').setup({
  automatic_installation = true,
})

local capabilities = vim.lsp.protocol.make_client_capabilities()
capabilities.textDocument.completion.completionItem.documentationFormat = { 'markdown', 'plaintext' }
capabilities.textDocument.completion.completionItem.snippetSupport = true
capabilities.textDocument.completion.completionItem.preselectSupport = true
capabilities.textDocument.completion.completionItem.insertReplaceSupport = true
capabilities.textDocument.completion.completionItem.labelDetailsSupport = true
capabilities.textDocument.completion.completionItem.deprecatedSupport = true
capabilities.textDocument.completion.completionItem.commitCharactersSupport = true
capabilities.textDocument.completion.completionItem.tagSupport = { valueSet = { 1 } }
capabilities.offsetEncoding = { 'utf-16' }
capabilities.textDocument.completion.completionItem.resolveSupport = {
  properties = {
    'documentation',
    'detail',
    'additionalTextEdits',
  },
}

OpenDiagFloat = function()
  for _, winid in pairs(vim.api.nvim_tabpage_list_wins(0)) do
    if vim.api.nvim_win_get_config(winid).zindex then
      return
    end
  end
  vim.diagnostic.open_float({ focusable = false })
end

local on_attach = function(client, bufnr)
  local function buf_set_option(...)
    vim.api.nvim_buf_set_option(bufnr, ...)
  end

  buf_set_option('omnifunc', 'v:lua.vim.lsp.omnifunc')
  vim.api.nvim_buf_set_option(0, 'formatexpr', 'v:lua.vim.lsp.formatexpr()')

  -- Mappings.
  local opts = { noremap = true, silent = false, buffer = bufnr }
  vim.keymap.set('n', '<space>,', vim.diagnostic.goto_prev, opts)
  vim.keymap.set('n', '<space>;', vim.diagnostic.goto_next, opts)
  vim.keymap.set('n', '<space>a', vim.lsp.buf.code_action, opts)
  vim.keymap.set('n', '<space>d', vim.lsp.buf.definition, opts)
  vim.keymap.set('n', '<space>e', vim.lsp.buf.declaration, opts)
  vim.keymap.set('n', '<space>h', vim.lsp.buf.hover, opts)
  vim.keymap.set('n', '<space>c', vim.lsp.buf.outgoing_calls, opts)
  vim.keymap.set('n', '<space>C', vim.lsp.buf.incoming_calls, opts)
  vim.keymap.set('n', '<space>m', vim.lsp.buf.rename, opts)
  local tele_builtins = require('telescope.builtin')
  vim.keymap.set('n', '<C-t>', tele_builtins.lsp_dynamic_workspace_symbols, opts)
  vim.keymap.set('n', '<space>D', vim.lsp.buf.type_definition, opts)
  vim.keymap.set('n', '<C-k>', vim.lsp.buf.signature_help, opts)
  vim.keymap.set('n', '<space>r', tele_builtins.lsp_references, opts)
  vim.keymap.set('n', '<A-m>', '<cmd>Telescope aerial<cr>', opts)
  vim.keymap.set('n', '<space>v', function() tele_builtins.diagnostics({ bufnr = 0 }) end, opts)
  vim.keymap.set('n', '<A-o>', '<cmd>ClangdSwitchSourceHeader<CR>', opts)

  vim.cmd([[autocmd CursorHold <buffer> lua OpenDiagFloat()]])

  -- Set some keybinds conditional on server capabilities
  if client.server_capabilities.documentFormattingProvider then
    vim.keymap.set('n', '<space>f', vim.lsp.buf.format, opts)
  end
  if client.server_capabilities.documentRangeFormattingProvider then
    vim.keymap.set('v', '<space>f', vim.lsp.buf.range_formatting, opts)
  end

  -- Set autocommands conditional on server_capabilities
  if client.server_capabilities.documentHighlightProvider then
    vim.api.nvim_exec(
      [[
      hi LspReferenceRead cterm=bold ctermbg=red guibg=DarkGreen
      hi LspReferenceWrite cterm=bold ctermbg=red guibg=DarkRed
      ]], false)
    vim.api.nvim_create_augroup("lsp_document_highlight", { clear = true })
    vim.api.nvim_clear_autocmds { buffer = bufnr, group = "lsp_document_highlight" }
    vim.api.nvim_create_autocmd("CursorHold", {
      callback = vim.lsp.buf.document_highlight,
      buffer = bufnr,
      group = "lsp_document_highlight",
      desc = "Document Highlight",
    })
    vim.api.nvim_create_autocmd("CursorMoved", {
      callback = vim.lsp.buf.clear_references,
      buffer = bufnr,
      group = "lsp_document_highlight",
      desc = "Clear All the References",
    })
  end

  require('lsp_signature').on_attach({
    bind = true, -- This is mandatory, otherwise border config won't get registered.
    handler_opts = {
      border = 'single',
    },
    hi_parameter = 'IncSearch',
  }, bufnr)
  require("aerial").on_attach(client, bufnr)
end

require('lspconfig')['pyright'].setup {
  on_attach = on_attach,
}

require('lspconfig')['cmake'].setup {
  on_attach = on_attach,
}

-- require('lspconfig')['clangd'].setup{
--     on_attach = on_attach,
-- }
require('clangd_extensions').setup({
  server = {
    on_attach = on_attach,
    capabilities = capabilities,
    cmd = { 'clangd', '--compile-commands-dir=build_nvim' },
  },
})

require('lspconfig')['jsonls'].setup {
  on_attach = on_attach,
}

local lua_rtp = vim.split(package.path, ';')
table.insert(lua_rtp, 'lua/?.lua')
table.insert(lua_rtp, 'lua/?/init.lua')
require('lspconfig').sumneko_lua.setup {
  on_attach = on_attach,
  settings = {
    Lua = {
      runtime = {
        -- Tell the language server which version of Lua you're using (most likely LuaJIT in the case of Neovim)
        version = 'LuaJIT',
        -- Setup your lua path
        path = lua_rtp,
      },
      diagnostics = {
        -- Get the language server to recognize the `vim` global
        globals = { 'vim', 'use' },
      },
      workspace = {
        -- Make the server aware of Neovim runtime files
        library = vim.api.nvim_get_runtime_file('', true),
      },
      -- Do not send telemetry data containing a randomized but unique identifier
      telemetry = {
        enable = false,
      },
    },
  }
}

require('lspconfig')['dockerls'].setup {
  on_attach = on_attach,
}

require('lspconfig')['yamlls'].setup {
  on_attach = on_attach,
  settings = {
    yaml = {
      validate = false
    }
  }
}

local null_ls = require('null-ls')
null_ls.setup({
  sources = {
    null_ls.builtins.code_actions.gitsigns,
    null_ls.builtins.formatting.autopep8,
    null_ls.builtins.formatting.prettier,
    null_ls.builtins.diagnostics.flake8,
    null_ls.builtins.formatting.isort,
    null_ls.builtins.formatting.cmake_format,
  },
  on_attach = on_attach,
  capabilities = capabilities,
})

vim.diagnostic.config({ virtual_text = false })