如何修改Linux下的vimrc函数使其适配Windows10 Cygwin环境

失效原因 #

原函数在Cygwin下无法运行是三个问题导致的：

• Cygwin默认不预装lsof工具，原命令直接执行失败
• Cygwin的/proc文件系统中进程环境变量存储格式和标准Linux发行版有差异，原命令用xargs -0 echo拼接环境变量时会丢失WINDOW字段
• 部分场景下Cygwin的路径映射会导致swp文件匹配失效，原逻辑没有兜底查询能力

适配方案 #

• 先安装依赖：运行Cygwin安装程序setup-x86_64.exe，搜索并安装lsof包，安装完成后在Cygwin终端执行which lsof，返回/usr/bin/lsof即为安装成功。
• 将.vimrc中原有的PrintScreenWindow相关配置替换为以下适配版本：

"""""""""""""""""""""""""""""""""""""""""""""""""""
" for screen use
" opened in another screen? lets not play where's waldo anymore!
" this will politely tell me which screen's window it is open in so that I may
" go close it if I want, but still provide me the normal options
" Cygwin适配版，同时兼容Linux各发行版
augroup NoSimultaneousEdits
    autocmd!
    autocmd SwapExists * :call PrintScreenWindow()
augroup END

function! PrintScreenWindow ()
  let fname = expand("%:p")
  let fname =  fnamemodify(fname, ':t')
  let fpath = expand("%:p:h")
  let all = fpath . "/." . fname
  " 自动识别lsof路径，无需手动配置
  let lsof_bin = exepath('lsof')
  let my_command = lsof_bin . " | grep '" . fname . ".swp' | grep " . $USER . " | sed -n 's/^vim\\? \\+\\([0-9]\\+\\).*$/\\1/p' "
  let result = substitute(system(my_command), '\n','','')
  if result
    " 适配Cygwin的/proc环境变量读取逻辑，用tr替换xargs避免空值
    let my_cmd2 = "cat /proc/" . result . "/environ | tr '\\0' '\\n' | grep '^WINDOW=' | cut -d= -f2"
    let res2 = substitute(system(my_cmd2), '\n','','')
    if res2 != '' || res2 == '0'
      echo 'This file is already opened in window: ' . res2
    else
      " 兜底逻辑：直接查询screen窗口列表匹配对应文件
      let current_screen = substitute(system('echo $STY | cut -d. -f1'), '\n', '', '')
      let fallback_cmd = "screen -S " . current_screen . " -Q windows | tr '  ' '\\n' | grep -B1 '" . fname . "' | head -n1 | tr -cd '0-9'"
      let res2_fb = substitute(system(fallback_cmd), '\n','','')
      if res2_fb != '' || res2_fb == '0'
        echo 'This file is already opened in window: ' . res2_fb
      else
        echo 'This file is already opened in another vim instance, PID: ' . result
      endif
    endif
  endif
endfunction

"""""""""""""""""""""""""""""""""""""""""""""""""""

验证方式 #

• 打开screen会话，在0号窗口用vim打开任意测试文件，保持运行不退出
• 切换到其他screen窗口，再次用vim打开同一个文件，vim底部会直接提示文件所在的窗口编号，直接按Ctrl+a 对应编号就能跳转到对应窗口
• 如果提示lsof不存在，重新运行Cygwin安装程序确认lsof包已安装到当前Cygwin环境即可，不需要额外配置路径。

内容的提问来源于stack exchange，提问作者PyTis