> Is there a way to call :update <some other file name> such that you can
> tell whether there actually were changes and that the file was written?
>
> I'd like to perform an action each time the current buffer changes (without
> explicitly saving to the current file), but presently calling :update
> <other file name> seems like a black hole as there's no way to know whether
> anything was written or not.
>
> I've tried treating update as a function by doing things like `echo
> update`, but it seems that it behaves differently from a function and it
> errors...
>
I'm really not sure what you're asking for (on one hand you talk about
writing changes with :update, and then you go into performing actions
on EVERY change, which is entirely different). But, for detecting when
a buffer is saved, a simple test shows that BufWritePre autocmds only
fire when an actual write will be performed. You can define a
BufWritePre autocmd, and if you run :update, the autocmd will only
fire if there are changes which will be written.
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