def assets_in_paths(app, segments):
"""
Select some assets from all of the static paths in the app which match the
given segments, and return the available basenames.
Useful for getting a list of options for random selections of banners or
other images.
"""
names = []
for path in app.static_paths:
root = FilePath(path)
fp = root.descendant(segments)
# Get some banners, if they exist.
if fp.exists():
names.extend([p.basename() for p in fp.children()])
return names
