API debugstack

Returns a string representation of the current calling stack. description = debugstack([coroutine,] [start[, count1[, count2]]])

• coroutine:Thread - The thread with the stack to examine (default - the calling thread)
• start: - the stack depth at which to start the stack trace (default 1 - the function calling debugstack, or the top of coroutine's stack)
• count1: - the number of functions to output at the top of the stack (default 12)
• count2: - the number of functions to output at the bottom of the stack (default 10)

• description: - a multi-line string showing what the current call stack looks like

If there are more than count1+count2 calls in the stack, they are separated by a "..." line.

Long lines may become truncated.

The string ends with an extra newline character.

Assume the following example file, "file.lua":

1: function a 2: error("Boom!"); 3: end 4: 5: function b a; end 6: 7: function c b; end 8: 9: function d c; end 10: 11: function e d; end 12: 13: function f e; end 14: 15: function errhandler(msg) 16: print (msg .. "\nCall stack: \n" .. debugstack(2, 3, 2)); 17: end 18: 19: xpcall(f, errhandler);

This would output something along the following:

file.lua:2: Boom! Call stack: file.lua:2: in function a file.lua:5: in function b file.lua:7: in function c ... file.lua:13: in function f file.lua:19

Combining debugstack with a strmatch can enable you to get the current line of a function call. 1: function debugprint(msg) 2: local line = strmatch(debugstack(2),":(%d):"); 3: print("Debug Print on Line "..line.." with message: "..msg); 4: end 5: 6: function doSomething 7: debugprint("We tried to do something."); 8: end This would return the following output from print: Debug Print on Line 7 with message: We tried to do something.

This is a WoW API modified version of Lua's debug.traceback function.