Multiple pacman cache directories in the form of aggregated CLI options

[Atreya Shankar]

Currently, the only way of passing multiple pacman cache directories would be to concatenate them into a space-separated string, such as:

downgrade --pacman-cache "/var/cache/pacman /my/thing/somewhere" foo

This issue proposes a modified feature where pacman caches can be aggregated, such that a user can specify multiple locations with ease:

downgrade
  --pacman-cache /var/cache/pacman \
  --pacman-cache ~/my/thing/somewhere \
  foo