How to catch a write command in a butype=nofile buffer

I am trying to catch write commands, to perform some specific commands when user enters a write command (:w, :x, or anything else).

In my plugin, I use a buffer with parameter buftype=nofile

I tried BufWriteCmd and BufWritePre, but these hooks come too late, I always get:

> E382: Cannot write, 'buftype' option is set

I currently use a cmap mapping, but I am not satisfied with this solution.

Is anyone has an advice?

Thanks,

Jérôme

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