local on_attach = function(_, bufnr)
    vim.api.nvim_buf_set_option(bufnr, "omnifunc", "v:lua.vim.lsp.omnifunc")
    vim.o.signcolumn = "yes"

    local map = function(from, to)
        vim.keymap.set("n", from, to,
            { noremap = true, silent = true, buffer = bufnr }
        )
    end

    local builtin = require('telescope.builtin')

    map("gd", builtin.lsp_definitions)
    map("gr", builtin.lsp_references)
    map("gi", builtin.lsp_implementations)
    map("gs", builtin.lsp_document_symbols)
    map("gD", vim.lsp.buf.declaration)

    map("K", vim.lsp.buf.hover)
    map("<C-k>", vim.lsp.buf.signature_help)

    map("<leader>wa", vim.lsp.buf.add_workspace_folder)
    map("<leader>wr", vim.lsp.buf.remove_workspace_folder)
    map("<leader>wl", function()
        print(vim.inspect(vim.lsp.buf.list_workspace_folders()))
    end)
    map("<leader>D", vim.lsp.buf.type_definition)
    map("<leader>rn", vim.lsp.buf.rename)
    map("<leader>ca", vim.lsp.buf.code_action)
    map("<leader>fm", function()
        vim.lsp.buf.format { async = true }
    end)
end

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

return {
    on_attach = on_attach,
    capabilities = capabilities
}