Hi vim_use!

I'm trying to read some info from a file to the status line. The file is
changed by an external command (basically a latex compiler). How can I run
a function (which reads the file) when the file changes without using vim
client-server communication. Any ideas?

The best what I can get is using :redrawstatus on CursorMoved or sth similar,
but it is not as good as I would like to.

To be more precise the setting is sth like this:

set statusline=%{ReadFile()}
fun! ReadFile()
" read some file and get an integer i from it.
return i
endfun

Best,
Marcin

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