How to convert non english text to uppercase in vim?

Question

I have the following text:

żółć gęślą jaźń

If I capitalize it in Vim (using gUU) under Windows (cp1250 encoding), I get:

żółć GęśLą JAźń

But I have to get:

ŻÓŁĆ GĘŚLĄ JAŹŃ

in accordance with the Polish alphabet.

Is there a way to override uppercase and lowercase letters in Vim?

Answer 1

There is always brute force method:

%s#\%(ż\|ó\|ł\)#\={'ż':'Ż','ó':'Ó','ł':'Ł'}[submatch(0)]#gcI 

Answer 2

You probably need to set your language correctly in Vim. Try adding this line to your vimrc

 lang ctype Polish_Poland.1250