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let g:airline#extensions#tabline#formatters#zhihu#formatter = get(g:, 'airline#extensions#tabline#formatters#zhihu#formatter', 'default')
function! airline#extensions#tabline#formatters#zhihu#format(bufnr, buffers)
let l:name = bufname(a:bufnr)
if match(l:name, 'zhihu://') == -1
return airline#extensions#tabline#formatters#{g:airline#extensions#tabline#formatters#zhihu#formatter}#format(a:bufnr, a:buffers)
endif
let l:prefix = matchstr(fnamemodify(l:name, ':h'), '\d\+')
if l:prefix !=# ''
let l:prefix .= '/'
endif
return l:prefix . fnamemodify(l:name, ':t')
endfunction