Error in my script

Question

I don't like to have to press ESC to change to normal mode, so I'm writing a small script for doing that for me, after a time. But I'm getting the following error:

Error detected while processing InsertEnter Auto commands for "*":
E521: Number required after =: updatetime=aunm

This is the script

let aunm=800
au InsertEnter * let aunm_restore=&updatetime | set updatetime=aunm | au CursorHoldI * :stopinsert
au InsertLeave * let &updatetime=aunm_restore

if I remove let aunm=800 and set manualy set updatetime=800 it works perfectly. But i would like to have a global var to change the time if needed.

Answer 1

Use

let &updatetime=aunm

. set does not accept expressions.

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By the way, I see your code constantly adds CursorHoldI events without clearing them out, this way you may end up with a hundred of them. You should use

autocmd! CursorHoldI * :stopinsert

(with bang) or just add it once (with a line just before au InsertEnter), in any case it won’t be triggered not in insert mode. Note: this command will clear out all CursorHoldI events with pattern * that are not in any group so if you have more you have to put them or this into a augroup {GroupName} | au … | augroup END (better to put both).