Consider the following (currently {caret} Depends on {ggplot2} and {lattice}):
NB: in the below I set R_DEFAULT_PACKAGES=methods just to reduce visual noise
search()
# [1] ".GlobalEnv" "package:methods" "Autoloads" "package:base"
library(data.table)
library(caret, pos="package:base")
search()
# [1] ".GlobalEnv" "package:lattice" "package:ggplot2"
# [4] "package:data.table" "package:caret" "package:methods"
# [7] "Autoloads" "package:base"
c.f. a session where we attach the Depends ourselves:
library(data.table)
library(lattice, pos='package:base')
library(ggplot2, pos='package:base')
library(caret, pos='package:base')
search()
# [1] ".GlobalEnv" "package:data.table" "package:methods"
# [4] "Autoloads" "package:lattice" "package:ggplot2"
# [7] "package:caret" "package:base"
I.e., the search() resolution of the Depends w.r.t. {data.table}
differs in the two invocations.
This is a bit surprising to me -- add it to the list of reasons why I
think 'Depends' should be deprecated.
For now, is this a bug? An existing workaround is to use
attach.required=FALSE, but it's not ideal -- it has the similar effect
of requiring the author to track down recursive Depends to attach them
manually.
Michael Chirico
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