Shopper is a shopping list plugin which allows you to maintain reusable shopping lists. You should create a text file called .list, .shopper, for example shopping.list, shopping.shopper, and use a text editor to make a list the items you might want to buy. You will later be able to select which of these items you want to buy at a particular time. If you want to separate the items you can do so by creating categories, which are prepended with '#'.
For example, shopping.list shopping.shopper could contain
Note that it isn't possible to choose exact quantities, so I often create a number of entries with different quantities in the name of the item, such as for the apples in the above example.
Once you've made your list, if you select "play" the filename file in the file viewer browser in Rockbox, Shopper will load it automatically.
There are two modes, edit mode and view mode. The edit mode shows all the items, and it allows you to select which of the items you want to buy. When you have finished selecting the items, use the menu to go to the view mode, and you will see only the items you wish to buy. If you 'select' an item in view mode then that item will be removed from the list.
When you exit Shopper the last view is saved, including which items you have selected, so if you re-open the shopping list it will be as you left it. There are additional menu options for clearing the list, selecting all items, showing and hiding the categories, toggling the categories, and displaying the playback menu.