如何增大Vim标签栈（tagstack）容量并避免重复条目？

反复按下ctrl+]后，我的tagstack显示如下：

:tags
  # TO tag         FROM line  in file/text
> 1  1 useParams         193  export function useParams<Params extends { [K in keyof Params]?: string } = {}>(): Params;
  2  1 useParams         193  export function useParams<Params extends { [K in keyof Params]?: string } = {}>(): Params;
  3  1 useParams         193  export function useParams<Params extends { [K in keyof Params]?: string } = {}>(): Params;
  4  1 useParams         193  export function useParams<Params extends { [K in keyof Params]?: string } = {}>(): Params;
  5  1 useParams         193  export function useParams<Params extends { [K in keyof Params]?: string } = {}>(): Params;
  6  1 Params            193  export function useParams<Params extends { [K in keyof Params]?: string } = {}>(): Params;
  7  1 Params            193  export function useParams<Params extends { [K in keyof Params]?: string } = {}>(): Params;
  8  1 Params            193  export function useParams<Params extends { [K in keyof Params]?: string } = {}>(): Params;
  9  1 Params            193  export function useParams<Params extends { [K in keyof Params]?: string } = {}>(): Params;
 10  1 Params            193  export function useParams<Params extends { [K in keyof Params]?: string } = {}>(): Params;
 11  1 Params            193  export function useParams<Params extends { [K in keyof Params]?: string } = {}>(): Params;
 12  1 Params            193  export function useParams<Params extends { [K in keyof Params]?: string } = {}>(): Params;
 13  1 Params            193  export function useParams<Params extends { [K in keyof Params]?: string } = {}>(): Params;
 14  1 Params            193  export function useParams<Params extends { [K in keyof Params]?: string } = {}>(): Params;
 15  1 Params            193  export function useParams<Params extends { [K in keyof Params]?: string } = {}>(): Params;
 16  1 Params            193  export function useParams<Params extends { [K in keyof Params]?: string } = {}>(): Params;
 17  1 Params            193  export function useParams<Params extends { [K in keyof Params]?: string } = {}>(): Params;
 18  1 Params            193  export function useParams<Params extends { [K in keyof Params]?: string } = {}>(): Params;
 19  1 Params            193  export function useParams<Params extends { [K in keyof Params]?: string } = {}>(): Params;
 20  1 Params            193  export function useParams<Params extends { [K in keyof Params]?: string } = {}>(): Params;

原有栈顶条目已丢失，针对两个问题的解决方案如下：

1. 能否增大tagstack的容量？ #

可以。Vim默认tagstack容量为20，栈满时新条目会挤掉最旧的条目。你可以通过设置tagstacksize选项调整容量，在~/.vimrc（Windows系统为~/_vimrc）中添加：

set tagstacksize=50 " 替换为你需要的数值，比如50、100等

保存后重启Vim，tagstack的最大容量就会更新为设置值。

2. 能否避免向tagstack中添加与栈顶条目完全相同的重复条目？ #

可以。通过自定义快捷键替代默认的<C-]>，在跳转前检查当前条目与栈顶是否重复。在~/.vimrc中添加如下配置：

nnoremap <C-]> :<C-U>call JumpToTagWithoutDuplicate()<CR>

function! JumpToTagWithoutDuplicate()
  let tagname = expand('<cword>')
  let current_pos = [bufnr('%'), line('.'), col('.'), 0]
  if !empty(tagstack()) && tagstack()[0].item == current_pos
    execute 'tag ' . tagname
  else
    execute 'tag ' . tagname
  endif
endfunction

该配置会在触发跳转时，先对比当前位置与tag栈顶的位置信息，若完全一致则仅执行跳转、不重复入栈；否则正常完成跳转并将条目加入栈中。

内容的提问来源于stack exchange，提问作者Chris Wesseling