Question

In Lua, is it possible to know which function has called the current function.

For instance

function a()
    get_calling_function()    --Should print function b
end 


function b()
    a() 
end 

Is something like this possible?
Does the debug library have such functionality?

Answer 1

You could use debug.traceback():

function a()
    print(debug.traceback())
end 


function b()
    a() 
end 

b()

which would print:

stack traceback:
    ./test.lua:45: in function 'a'
    ./test.lua:50: in function 'b'
    ./test.lua:53: in main chunk
    [C]: in ?