%inv:EXPR% inventory is empty
Checks if a custom inventory is completely empty.
if gui inventory is empty:
Every distinct way you can write this pattern, with optional groups and choice groups expanded. Placeholders are shown as <name>.
<inv> inventory is empty
%b:BLOCK% inventory (is|is not) empty
%b:BLOCK% is [a] container
slot %slot:INT% of %inv:EXPR% is empty
slot %slot:INT% of %inv:EXPR% is not empty
%inv:EXPR% inventory is not empty
%inv:EXPR% inventory contains %mat:MATERIAL%
%inv:EXPR% inventory does not contain %mat:MATERIAL%
%inv:EXPR% is [a] lumen inventory
%inv:EXPR% is not [a] lumen inventory