"Function for getting random numbers

function! Randnum(max) abort

return str2nr(matchstr(reltimestr(reltime()), '\v\.@<=\d+')[1:]) % a:max

endfunction

"feel free to change this to your language

"alphabet of ascii characters from [a-z]

let alphabet = map(range(char2nr('a'), char2nr('z')), 'nr2char(v:val)')

"Create a map of all keys [a-z]

let keyhash = {}

for i in alphabet

let keyhash[i] = 0

endfor

"Now iterate over the map, and set it to a random key

for key in keys(keyhash)

"look for a random letter that hasn't been used yet

while 1

let pos = Randnum(26)

let newkey = keys(keyhash)[pos]

"Removing used keys and the same key (because that would be lame)

if keyhash[newkey] == 1 || key == newkey

continue

endif

break

endwhile

"Note: The only way to set dynamic bindings is via `execute [binding command as string]`

execute "noremap ". newkey . " " . key

let keyhash[newkey] = 1

endfor