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.vim/ftplugin/rst/word_utils.vim

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function! WordFrequency() range
let all = split(join(getline(a:firstline, a:lastline)), '\k\+')
let frequencies = {}
for word in all
let frequencies[word] = get(frequencies, word, 0) + 1
endfor
new
setlocal buftype=nofile bufhidden=hide noswapfile tabstop=4
for [key,value] in items(frequencies)
call append('$', value."\t".key)
endfor
sort i
endfunction
command! -range=% WordFrequency <line1>,<line2>call WordFrequency()
function! CreateDict() range
let all = split(join(getline(a:firstline, a:lastline)), '[^A-Za-zęóąśłżźćńĘÓĄŚŁŻŹĆŃ]\+')
let frequencies = {}
for word in all
let frequencies[word] = get(frequencies, word, 0) + 1
endfor
new
setlocal buftype=nofile bufhidden=hide noswapfile
for [key,value] in items(frequencies)
call append('$', key)
endfor
sort i
endfunction
command! -range=% CreateDict <line1>,<line2>call CreateDict()