Item Stacker Reborn

Item Stacker
This plugin let you to stack items inside your inventory together. There is no problem for you to place Stacked Lava Bucket / Water Bucket on the floor.

Functions:

• You can define what items can be stack with permissions
• You can limit who can stack the item with permission
• You can turn off permission in config.yml
• You can change the max stack sized on config.yml (Min: 1 , Max: 127
• You can stack the item with only one command
• You can change the message inside the config.yml

Commands:

/stackitems - Stack the item that you holding with your hands

Permissions:

itemstacker.use - access to all function of the plugin
itemstacker.stack.<material> - if enabled per-items-perms inside config.yml, this permission allowed player to stack specific item only

Configuration:

# Do you want to use this command only for specific items?
# If this is true, players will need the itemstacker.stack.<ITEM> permission.
# e.g. itemstacker.stack.COBBLESTONE
# All item names can be found here: https://hub.spigotmc.org/javadocs/spigot/org/bukkit/Material.html
per-item-perms: true

# Default stack size for every item
# ! DO NOT SET SIZE HIGHER THAN 127 !
# Maximum possible stack size of Minecraft vanilla clients is 127
# Value 0 -> will stack each item on its normal vanilla-default value 
stack-size: 0

# Different stack size for some items
# Stack sizes in here will override default stack-size defined above
# e.g. 'EGG': '32'
# You need to use Item names, like they are defined here: https://hub.spigotmc.org/javadocs/spigot/org/bukkit/Material.html
special-sizes:
  'WATER_BUCKET': '16'
  'LAVA_BUCKET': '16'

# Define the ingame messages.
messages:
  'no-perm': '&7[&eStacker&7]&2 You are not permitted to use this command.'
  'no-itemperm': '&7[&eStacker&7]&2 You need &a&o<PERM>&2 to stack this item.'
  'no-player': '&7[&eStacker&7]&2 Only players can use this command.'
  'no-item': '&7[&eStacker&7]&2 You need to hold the item you want to stack in your hand.'
  'stacked': '&7[&eStacker&7]&2 All &a&o<TYPE>&2 items has been combined.'

Thanks to @DumptruckLove for the ideas
This is a reborn version of Item_Stacker