d0feae0632
ln_sf does the right thing when `dest` is a symlink pointing to a file: the symlink gets overwritten with a link pointing to the new src. But when dest points to a directory, we create a new symlink inside the folder dest points to, which doesn't help us at all.
Homebrew's Formula API
This is the (partially) documented public API for Homebrew.
The main class you should look at is the {Formula} class (and classes linked from there). That's the class that's used to create Homebrew formulae (i.e. package descriptions). Assume anything else you stumble upon is private.
You may also find the Formula Cookbook and Ruby Style Guide helpful in creating formulae.
Good luck!