I've been looking for a mod that does this but couldn't find, so if it already exists please tell me the name (I know HoloInventory btw, but it's not what I'm asking for)
Say I'm in a factions server and I'm raiding a base. The guy is coming, and his base got 50 different chests, most of them empty. I need a specific item badly, but can't find it at all in these chests. SURPRISE! WHILE I WAS LOOKING FOR THE ITEM THE GUY COMES BEHIND AND KILLS ME WITH HIS SHARP 3 SWORD! (this didn't actually happen, it's just an example) He now has all my enchanted iron armor! Oh no! I'll have to start from the beggining!
So my idea is, you can, in the mod's GUI or something, select any item or block or whatever, and a color. Then, all chests that contain that item will be not only highlighted by the color you choose, but also visible through walls (because that guy's diamonds were actually in a secret room behind a cobblestone wall, for example). This would also work for Trapped and Ender chests, and maybe even Dispensers and these blocks with an inventory.
I and certainly many people will be really happy if anyone makes this (I wonder if it's even possible tho?).
1. This mod (if it existed) wouldn't even work on a server without the mod installed on both sides, because in vanilla minecraft the client does not know about a chest's inventory unless you open it....
2. Enderchests don't even have an inventory, so that wouldn't work either..