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function Count() abort
let spaces = {
\ 'hist': {},
\ 'total': 0,
\}
let tabs = 0
let total = line('$')
for lnum in range(1, total)
let line = getline(lnum)
let tabs += matchstr(line, '^\t*') != ''
let indent = strlen(matchstr(line, '^ *'))
if indent == 0
continue
endif
if !has_key(spaces['hist'], indent)
let spaces['hist'][indent] = 0
endif
let spaces['hist'][indent] += 1
let spaces['total'] += 1
endfor
if &expandtab && tabs > spaces['total'] * 5
setlocal noexpandtab softtabstop=0
let &l:shiftwidth = &tabstop
setlocal expandtab?
elseif !&expandtab && spaces['total'] > tabs * 5
let shiftwidth = 0
for shiftwidth in sort(keys(spaces['hist']))
if spaces['hist'][shiftwidth] * 100 / spaces['total'] >= 5
break
endif
endfor
setlocal expandtab
let &l:shiftwidth = shiftwidth
let &l:softtabstop = shiftwidth
setlocal expandtab? shiftwidth?
endif
endfunction
autocmd FileType * call Count()
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