nvim/plugin-confs/lspconfig.lua

local opts = { noremap = true, silent = true }
vim.api.nvim_set_keymap('n', '<space>e', '<cmd>lua vim.diagnostic.open_float()<CR>', opts)
vim.api.nvim_set_keymap('n', '[d', '<cmd>lua vim.diagnostic.goto_prev()<CR>', opts)
vim.api.nvim_set_keymap('n', ']d', '<cmd>lua vim.diagnostic.goto_next()<CR>', opts)
vim.api.nvim_set_keymap('n', '<space>q', '<cmd>lua vim.diagnostic.setloclist()<CR>', opts)

-- Use an on_attach function to only map the following keys
-- after the language server attaches to the current buffer
local on_attach = function(client, bufnr)
    -- Enable completion triggered by <c-x><c-o>
    vim.api.nvim_buf_set_option(bufnr, 'omnifunc', 'v:lua.vim.lsp.omnifunc')

    -- Mappings.
    -- See `:help vim.lsp.*` for documentation on any of the below functions
    -- set in ~/.config/nvim/keybindings.vim
    -- 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-s>', '<cmd>lua vim.lsp.buf.signature_help()<CR>', opts)
    -- vim.api.nvim_buf_set_keymap(bufnr, 'n', '<space>wa', '<cmd>lua vim.lsp.buf.add_workspace_folder()<CR>', opts)
    -- vim.api.nvim_buf_set_keymap(bufnr, 'n', '<space>wr', '<cmd>lua vim.lsp.buf.remove_workspace_folder()<CR>', opts)
    -- vim.api.nvim_buf_set_keymap(bufnr, 'n', '<space>wl', '<cmd>lua print(vim.inspect(vim.lsp.buf.list_workspace_folders()))<CR>', opts)
    -- vim.api.nvim_buf_set_keymap(bufnr, 'n', '<space>D', '<cmd>lua vim.lsp.buf.type_definition()<CR>', opts)
    -- vim.api.nvim_buf_set_keymap(bufnr, 'n', '<space>rn', '<cmd>lua vim.lsp.buf.rename()<CR>', opts)
    -- vim.api.nvim_buf_set_keymap(bufnr, 'n', '<space>ca', '<cmd>lua vim.lsp.buf.code_action()<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', '<space>f', '<cmd>lua vim.lsp.buf.formatting()<CR>', opts)
    -- highlighting things under cursor
    -- if client.resolved_capabilities.document_highlight then
    --   vim.cmd [[
    --     hi! LspReferenceRead cterm=bold ctermbg=red guibg=LightYellow
    --     hi! LspReferenceText cterm=bold ctermbg=red guibg=LightYellow
    --     hi! LspReferenceWrite cterm=bold ctermbg=red guibg=LightYellow
    --     augroup lsp_document_highlight
    --       autocmd! * <buffer>
    --       autocmd! CursorHold <buffer> lua vim.lsp.buf.document_highlight()
    --       autocmd! CursorMoved <buffer> lua vim.lsp.buf.clear_references()
    --     augroup END
    --   ]]
    -- end
end

vim.cmd [[autocmd! ColorScheme * highlight NormalFloat guibg=#1f2335]]
vim.cmd [[autocmd! ColorScheme * highlight FloatBorder guifg=white guibg=#1f2335]]

-- squared corners

-- local border = {
--       {"┌", "FloatBorder"},
--       {"─", "FloatBorder"},
--       {"┐", "FloatBorder"},
--       {"|", "FloatBorder"},
--       {"┘", "FloatBorder"},
--       {"─", "FloatBorder"},
--       {"└", "FloatBorder"},
--       {"|", "FloatBorder"},
-- }

-- rounded

local border = {
    { "╭", "FloatBorder" },
    { "─", "FloatBorder" },
    { "╮", "FloatBorder" },
    { "│", "FloatBorder" },
    { "╯", "FloatBorder" },
    { "─", "FloatBorder" },
    { "╰", "FloatBorder" },
    { "│", "FloatBorder" },
}


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

-- local orig_util_open_floating_preview = vim.lsp.util.open_floating_preview
-- function vim.lsp.util.open_floating_preview(contents, syntax, opts, ...)
--     opts = {
--         { "border", border },
--     }
--     opts.border = opts.border or border
--     return orig_util_open_floating_preview(contents, syntax, opts, ...)
-- end

local DEFAULT_SETTINGS = {
    ui = {
        icons = {
            -- The list icon to use for installed servers.
            server_installed = "◍",
            -- The list icon to use for servers that are pending installation.
            server_pending = "◍",
            -- The list icon to use for servers that are not installed.
            server_uninstalled = "◍",
        },
        keymaps = {
            -- Keymap to expand a server in the UI
            toggle_server_expand = "<CR>",
            -- Keymap to install a server
            install_server = "i",
            -- Keymap to reinstall/update a server
            update_server = "u",
            -- Keymap to update all installed servers
            update_all_servers = "U",
            -- Keymap to uninstall a server
            uninstall_server = "X",
        },
    },

    -- The directory in which to install all servers.
    -- install_root_dir = "/home/sudacode/.vim/lsp",

    pip = {
        -- These args will be added to `pip install` calls. Note that setting extra args might impact intended behavior
        -- and is not recommended.
        --
        -- Example: { "--proxy", "https://proxyserver" }
        install_args = {},
    },
    on_attach = on_attach,
    handlers = handlers,

    -- Controls to which degree logs are written to the log file. It's useful to set this to vim.log.levels.DEBUG when
    -- debugging issues with server installations.
    log_level = vim.log.levels.INFO,

    -- Limit for the maximum amount of servers to be installed at the same time. Once this limit is reached, any further
    -- servers that are requested to be installed will be put in a queue.
    max_concurrent_installers = 4,
}

vim.diagnostic.config({
    virtual_text = true,
    signs = true,
    underline = false,
    update_in_insert = false,
    severity_sort = true,
})

local signs = { Error = " ", Warn = " ", Hint = " ", Info = " " }
for type, icon in pairs(signs) do
    local hl = "DiagnosticSign" .. type
    vim.fn.sign_define(hl, { text = icon, texthl = hl, numhl = hl })
end

function PrintDiagnostics(opts, bufnr, line_nr, client_id)
    bufnr = bufnr or 0
    line_nr = line_nr or (vim.api.nvim_win_get_cursor(0)[1] - 1)
    opts = opts or { ['lnum'] = line_nr }

    local line_diagnostics = vim.diagnostic.get(bufnr, opts)
    if vim.tbl_isempty(line_diagnostics) then return end

    local diagnostic_message = ""
    for i, diagnostic in ipairs(line_diagnostics) do
        diagnostic_message = diagnostic_message .. string.format("%d: %s", i, diagnostic.message or "")
        print(diagnostic_message)
        if i ~= #line_diagnostics then
            diagnostic_message = diagnostic_message .. "\n"
        end
    end
    vim.api.nvim_echo({ { diagnostic_message, "Normal" } }, false, {})
end

-- vim.cmd [[ autocmd! CursorHold * lua PrintDiagnostics() ]]

local lsp_installer = require("nvim-lsp-installer")

-- Register a handler that will be called for each installed server when it's ready (i.e. when installation is finished
-- or if the server is already installed).
lsp_installer.on_server_ready(function(server)
    local opts = {}

    -- (optional) Customize the options passed to the server
    -- if server.name == "tsserver" then
    --     opts.root_dir = function() ... end
    -- end

    -- This setup() function will take the provided server configuration and decorate it with the necessary properties
    -- before passing it onwards to lspconfig.
    -- Refer to https://github.com/neovim/nvim-lspconfig/blob/master/doc/server_configurations.md
    server:setup(DEFAULT_SETTINGS)
end)


-- local servers = { 'jedi_language_server', 'bashls', 'vimls', 'yamlls', 'dockerls', 'rust_analyzer', 'clangd', 'ansiblels' }
-- for _, lsp in pairs(servers) do
--     require('lspconfig')[lsp].setup {
--         on_attach = on_attach,
--         handlers = handlers,
--         flags = {
--             -- This will be the default in neovim 0.7+
--             debounce_text_changes = 150,
--         }
--     }
-- end

-- local plugins_path = vim.fn.stdpath("data") .. "site/autoload/plug.vim"
-- local dir_list = vim.fn.glob(plugins_path .. "/*", true, true)
-- local library_table = {}
-- for _, v in ipairs(dir_list) do
--   library_table[v .. "/lua"] = true
-- end
-- library_table[vim.fn.expand("$VIMRUNTIME/lua")] = true
-- library_table[vim.fn.stdpath("config") .. "/lua"] = true
-- require('lspconfig').sumneko_lua.setup({
--   settings = {
--     Lua = {
--       diagnostics = { globals = { "vim" } },
--       workspace = { library = library_table },
--     },
--   },
-- })

-- -- require 'lspconfig'.bashls.setup {}