VIM mapping for quick replacing of keyword under cursor

refactor.vim

" quick refactoring: replace keyword under cursor
" `<leader>s`: main mapping
" `<SID>R`: arbitrary local mapping
" stores original position into `s before action
function! My_refactor(prefix)
    return ':' . a:prefix . '%s/\<' . @" . '\>//g'
endfunction
nnoremap <special> <expr> <SID>refactor My_refactor('')
nmap <special> <leader>s msyiw<SID>refactor<left><left>

" delete trailing space in all lines
nnoremap <silent> <leader>dt :%s/\s\+$/<CR>:noh<CR>