Call stack utility functions — call-stack • fmesher

Helper functions for displaying call stack information

Usage

fm_caller_name(which = 0L, override = NULL)

fm_call_stack(start = 0L, end = 0L, with_numbers = TRUE, ...)

fm_try_callstack(expr)

Arguments

which: The number of frames to go back from the caller
override: character; Overrides the automated function name logic
start: The stack starting point
end: The stack end point
with_numbers: INclude call stack location numbers
...: Currently unused
expr: An expression to evaluate

Value

fm_caller_name returns a string with the the name of a calling function

fm_call_stack returns a character vector

fm_try_callstack If successful, returns (invisibly) the value from the evaluated expression, otherwise an error object with call stack information attached to the error message.

Functions

fm_call_stack():
fm_try_callstack(): Inspired by berryFunctions::tryStack

Examples

fun <- function() {
  print(fm_caller_name())
  nm <- fm_caller_name()
  print(nm)
}
fun()
#> [1] "print"
#> [1] "fun"