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When writing Greek, sigmas at the ends of words should have a different form. Can I do something automatically to replace: μῖσοσ by μῖσος, and so in all such cases?

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    How about running %s/σ\>/ς/g whenever you save the file? – muru Nov 13 '15 at 17:58
  • Yes, but it would be better to have it corrected straight away. – Toothrot Nov 13 '15 at 18:09
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    It's even better to write it correctly from the start :P You could use (greek) dictionary-based autocompletion – VanLaser Nov 13 '15 at 18:10
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    The problem is distinguishing an end-of-word sigma from a normal one. I think you'll have to content yourself with typing some other key combination at the end of word (say inoremap σ<spac> ς), then any sigma followed by space will be replaced by the other form. But then you'd have to add another space manually. – muru Nov 13 '15 at 18:16
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Since a final sigma is quickly followed with a space even if a punctuation marks immediately followf it (except for the end-of-line case), you could do this: define the folowwing function (in your ~/.vimrc file) and remap the space key in insert mode to this function.

" The function checks whether a final greek sigma to be fixed can be found
" on the same line at the left of the cursor; the function should be accessed
" through a mapping of the space key in insert mode (since even punctuation
" marks are flollowed with a space.
function! FixPreviousSigma()
    let l:l = line(".")
    let l:c = col(".")
    let l:s = search('σ\>', 'bcW', l:l)
    if l:s == l:l
        silent execute "normal rς"
    endif
    call cursor(l:l, l:c)
endfunction

Then use the tricky mapping whenever you need to use this feature:

:inoremap <Space> <ESC>:call FixPreviousSigma()<CR>a<C-v><Space>

If you also want to take into account the end-of-line case, maybe you could also try:

:inoremap <Enter> <ESC>:callFixPreviousSigma()<CR>o
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