In early stages of development, the final product is aiming to be a tool for guild masters to be able to make a list of items that they require either for donation to the guild bank, or for guilds who have material "farming teams".
The planned functionality albeit simple has already made our guild master's life so much easier, and has increased material farming by tenfold.
The add-on will be controlled via the guild bank's tab info text section via a little piece of formatting that will be generated by the add-on and by placing this formatting into the tab info, a guild master can build a list of items required for that tab to be farmed. When a guild member with the add-on opens their guild bank and calls the command to check the list, will be given a list of items to farm the quantity that is remaining to be farmed (based on the quantity that the guild master asks for minus any of the item that is currently in the guild bank).
It's not limited to guild masters to create the list. Anyone with the add-on that has access granted by the guild master to update bank tab text will be able to perform the creation of the "shopping list".
The bank tab only needs to be opened once per farming session when the player is out farming the ui will have various information about what is left to gather so they don't need to keep returning to the guild bank to find out whats left. saving precious farming time.