Preprocessing .tex file

[Matej Cepl]

Hi,

I am a Czech. And we have a problem in the Czech typography -- 
one letter prepositions. According to the Czech typographical rules, 
one-letter preposition cannot be the last word on a line. Therefore, 
some Czechs prepared program vlnka (see 
http://math.feld.cvut.cz/olsak/Welcome.html for further reference), 
which replaces space after one-letter preposition by tilde (~). How 
to include such preprocessor to work in the LyX-driven process of 
{dvi,ps}-generation?

                        Have a nice day

                                                                Matej Cepl