Press the § key (below esc on mac keyboards) and a list of suggestions pop up. Press enter and it'll update and show a tool-tip.
You can also press tab to jump between each argument.
I've added all the functions to the list from the wiki, but not every functions has a tooltip and arguments yet,
if anyone wants to help finish this tedious task the completion list is stored in LOVE.tmbundle/support/completions.rb
it's a ruby hash table but it's pretty self explanatory to edit. Just fork and send a pull request.


Get it here:
http://github.com/perky/love2d-textmate-bundle