(Under 2.2.0, Mac)
I have been unable to reduce this to a simple case, so I'll include my
full code, and my intentions. The problem I'm trying to solve is that
while many defaults (eg. na.rm=F, drop=T) make sense for interactive
programming, they tend to be a bit of a pain when developing a
package. For example, I often forget to use drop=FALSE, only test
with multiple columns and then spend ages trying to figure out why it
doesn't work when I use the function with a single column. The idea of
the functions below is to automatically warn me when I do something
like that.
trace_all <- function(fs, tracer) {
sapply(fs, trace, tracer=tracer, print=FALSE)
return()
}
functions_with_arg <- function(arg, pos) {
fs <- ls(pos=pos)
present <- unlist(lapply(fs, function(x) is.function(get(x)) &&
!is.null(formals(x)[[arg]])))
fs[present]
}
trace_all(list("sum"), quote(if (!na.rm) warning("na.rm = FALSE")))
# Works
trace_all(functions_with_arg("na.rm", "package:base"), quote(if
(!na.rm) warning("na.rm = FALSE")))
# Segfaults
I'd be happy to explore alternative approaches, especially since this
approach modifies the functions in their original namespaces, and I
only want to see the warnings when my functions use these functions.
Hadley
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