nvim/lua/lsp/attach.lua

-- 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)
    -- Mappings.
    -- See `:help vim.lsp.*` for documentation on any of the below functions
    local bufopts = { noremap = true, silent = true, buffer = bufnr }
    vim.keymap.set("n", "gd", vim.lsp.buf.definition, bufopts)
    vim.keymap.set("n", "gr", vim.lsp.buf.references, bufopts)
    vim.keymap.set("n", "gi", vim.lsp.buf.implementation, bufopts)
    vim.keymap.set("n", "K", vim.lsp.buf.hover, bufopts)
    vim.keymap.set("n", "<leader>D", vim.lsp.buf.type_definition, bufopts)
    vim.keymap.set("n", "<leader>rn", vim.lsp.buf.rename, bufopts)
    vim.keymap.set("n", "<leader>ca", vim.lsp.buf.code_action, bufopts)
    vim.keymap.set(
        "n",
        "<leader>i",
        function() vim.lsp.buf.format { bufnr = bufnr, timeout_ms = 2000, async = true } end,
        bufopts
    )

    -- specific client tweaks
    if client.name ~= "null-ls" then client.server_capabilities.documentFormattingProvider = false end
    if client.name == "ruff_lsp" then client.server_capabilities.hoverProvider = false end

    -- Attach navic and navbuddy if applicable
    if client.server_capabilities.documentSymbolProvider then
        require("nvim-navic").attach(client, bufnr)
        require("nvim-navbuddy").attach(client, bufnr)
    end
end
return on_attach