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This is a fabric mod for Minecraft 1.21, which allows you to set breakpoints in the game and "freeze" the game when the breakpoint is reached.

• Set a breakpoint

In datapack, you can insert #breakpoint into .mcfunction file to set a breakpoint. For example:

#test:test

say 1
say 2
#breakpoint
say 3
say 4

In this case, after the game executes say 2, the game will be "frozen" because it meets the breakpoint.

When the game is "frozen", you can still move around, do whatever you want, just like execute the command tick freeze. So you can check the game state, or do some debugging.

• Step

When the game is "frozen", you can use the command /breakpoint step to execute the next command. In above example, after the game meets the breakpoint, you can use /breakpoint step to execute say 3, and then use /breakpoint step to execute say 4. When all commands are executed, the game will be unfrozen and continue running.

• Continue

When the game is "frozen", you can use the command /breakpoint move to unfreeze the game and continue running.

• Get Macro Arguments

By using /breakpoint get <key>, you can get the value of the macro argument if the game is executing a macro function. For example:

#test:test_macro

say start
#breakpoint
$say $(msg)
say end

After executing function test:test_macro {"msg":"test"}, we passed the value test to the macro argument msg and then the game will pause before $say $(msg). At this time, you can use /breakpoint get msg to get the value test.

• Get Function Stack

By using /breakpoint stack, you can get the function stack of the current game. For example, if we have following two functions:

#test:test1

say 1
function test:test2
say 2

#test: test2
say A
#breakpoint
say B

When the game pauses at the breakpoint, you can use /breakpoint stack and the function stack will be printed in the chat screen:

test:test2
test:test

• Run command in current context

By using /breakpoint run <command>, you can run any command in the current context, just like execute ... run ....