How to pass a format string to ?

command! -nargs=? -complete=file CCTreeLoadDB call s:CCTreeCmdLine.mLoadDB(<q-args>, s:DBClasses.cscopeid)


function! LoadCCTree()
let newcsdbpath = FindInParent("cscope.out",WindowDir(),$HOME)
if newcsdbpath != "Nothing"
let b:csdbpath = newcsdbpath
CCTreeLoadDB b:csdbpath . "cscope.out"
endif
endfunc

augroup AutoLoadCCTree
au!
au BufEnter *.[chly] call LoadCCTree()
au BufEnter *.cc call LoadCCTree()
augroup END

Not using the format string to load.
Help me.

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