How to go to command line mode from script

Hello,

How can I open a command line prompt from script, print a command there and leave it open so I can continue typing it and then press Enter myself. Sounds simple, but I've been searching for a solution for long, yet haven't lost my hope. That's a ruff example of what it would look like:

function! foo()
    " start command line mode, print there ':echo "hello"' and that's it
endfunction
map <F12> :call foo()<CR>

So when I press F12 it opens a command line with:
:echo "hello"<cursor here>
and I still can continue typing, I don't want it to be executed immediately.

:) I could use this:
map <F12> :echo "hello"
but my real function has to do some stuff before it gets a ready command to print out, that makes it very hard or even impossible to retype the whole thing to single mapping.

--
Aarto

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