map F8 to regenerate a password under the cursor using pwgen

.vimrc

@@ -145,4 +145,13 @@ if !has('gui_running')
   set t_Co=256
 endif
 
+nnoremap <F8> :call SetNewPassword()<CR>
+function! SetNewPassword()
+  let cur_word = expand('<cword>')
+  let cmd = 'pwgen ' . strlen(cur_word) . ' 1'
+  let new_password = system(cmd)[:-2]
+  " Replace current word with a new random password of the same length
+  call setline(line('.'), substitute(getline('.'), cur_word, new_password, ""))
+endfunction
+
 call plug#end()