do_prework {drake} | R Documentation |
Do the prework in the prework
argument to make()
.
![[Stable]](../help/figures/lifecycle-stable.svg)
Description
For internal use only. The only reason this function is exported is to set up parallel socket (PSOCK) clusters without too much fuss.
Usage
do_prework(config, verbose_packages)
Arguments
config |
A configured workflow from |
verbose_packages |
logical, whether to print package startup messages |
Value
Inivisibly returns NULL
.
Examples
## Not run:
isolate_example("Quarantine side effects.", {
if (suppressWarnings(require("knitr"))) {
load_mtcars_example() # Get the code with drake_example("mtcars").
# Create a main internal configuration list with prework.
con <- drake_config(my_plan, prework = c("library(knitr)", "x <- 1"))
# Do the prework. Usually done at the beginning of `make()`,
# and for distributed computing backends like "future_lapply",
# right before each target is built.
do_prework(config = con, verbose_packages = TRUE)
# The `eval` element is the environment where the prework
# and the commands in your workflow plan data frame are executed.
identical(con$eval$x, 1) # Should be TRUE.
}
})
## End(Not run)
[Package drake version 7.13.11 Index]