# A trigger is just a set of decision rules
# to decide whether to build a target.
trigger()
# This trigger will build a target on Tuesdays
# and when the value of an online dataset changes.
trigger(condition = today() == "Tuesday", change = get_online_dataset())
if (FALSE) {
isolate_example("Quarantine side effects.", {
if (suppressWarnings(require("knitr"))) {
load_mtcars_example() # Get the code with drake_example("mtcars").
# You can use a global trigger argument:
# for example, to always run everything.
make(my_plan, trigger = trigger(condition = TRUE))
make(my_plan, trigger = trigger(condition = TRUE))
# You can also define specific triggers for each target.
plan <- drake_plan(
x = sample.int(15),
y = target(
command = x + 1,
trigger = trigger(depend = FALSE)
)
)
# Now, when x changes, y will not.
make(plan)
make(plan)
plan$command[1] <- "sample.int(16)" # change x
make(plan)
}
})
}
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