neosnippet.vim/autoload/vim_snippets.vim

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" For honza-snippets function.
function! vim_snippets#Filename(...)
let filename = expand('%:t:r')
if filename == ''
return a:0 == 2 ? a:2 : ''
elseif a:0 == 0 || a:1 == ''
return filename
else
return substitute(a:1, '$1', filename, 'g')
endif
endfunction