This package provides the autolog function, which instruments all functions in a session or package to let you follow along with the execution.
Here is an example:
autolg> f <- function(a,b) a / b
autolg> zzz <- function(x,y) f(x,y) / f(y,x)
autolg> autolog(environment(), verbose=TRUE)
wrapping f
wrapping zzz
autolg> zzz(2,1)
2015-02-24 18:55:10 zzz(2, 1) enter
2015-02-24 18:55:10 f(x, y) enter
2015-02-24 18:55:10 f(x, y) exit
2015-02-24 18:55:10 f(y, x) enter
2015-02-24 18:55:10 f(y, x) exit
2015-02-24 18:55:10 zzz(2, 1) exit
If you would like to add logging to an entire package, add the following to R/zzz.R:
if(getOption("autologging", FALSE) && require(autolog)) autolog(environment())
This will be run on package load and add logging to every function in the package, including non-exported functions. To activate it,
options(autologging=TRUE) # Set *before* you load the pkg
library(mypkg)