Option to generate tags for open windows or buffers only? about vim-gutentags HOT 3 OPEN

function! GitF(regfilter,curfile) 
    if (a:curfile)

    let tmp=getcwd()
    :exe ":cd ". expand("%:p:h")
endif 
    let top = systemlist("git rev-parse --show-toplevel")[0]
    "echo top
    :exe ':cd '. top
    let a=systemlist("git ls-files --full-name" )
    :if len(a:regfilter)>0
    let a = filter(a,{idx,val -> (val =~ a:regfilter)})
    let a= map(a, {idx,fname -> fnamemodify(fname, ':p')})
    :endif 
    ":echo a
    :call writefile(a,'c:\temp\filelist.txt')
    try
        echohl Question
        let pattern = input("Search pattern: ")
        let pattern = escape(pattern,'"')
    finally
        echohl None
    endtry
    if (a:curfile)
    
    :exe ':cd '.tmp
endif 
    exec printf("Leaderf rg --filelist c:\\temp\\filelist.txt %s\"%s\"", pattern =~ '^\s*$' ? '' : '-e ', pattern )

endfunction