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Print a warning or message only once using rlang functions

Source: R/rlang.R
onetime-rlang.Rd

If you use these you will need to add "rlang" to your package dependencies.

Usage

onetime_rlang_warn(
  ...,
  id = deprecate_calling_package(),
  path = default_lockfile_dir(),
  expiry = NULL,
  without_permission = "warn"
)

onetime_rlang_inform(
  ...,
  id = deprecate_calling_package(),
  path = default_lockfile_dir(),
  expiry = NULL,
  without_permission = "warn"
)

Arguments

...

Passed to rlang::warn() or rlang::inform().

id

Unique ID string. If this is unset, the name of the calling package will be used. Since onetime 0.2.0, not setting id is deprecated.

path

Directory to store lockfiles. The default uses a unique directory corresponding to the calling package, beneath rappdirs::user_config_dir(). Normally you should leave this as the default.

expiry

difftime() or e.g. lubridate::duration() object. After this length of time, code will be run again.

without_permission

Character string. What to do if the user hasn't given permission to store files? "warn" runs the action with an extra warning; "run" runs the action with no warning; "pass" does nothing and returns the default; "stop" throws an error; "ask" asks for permission using check_ok_to_store(), and returns the default if it is not granted.

Value

Invisibly: TRUE if the message/warning was shown, FALSE otherwise.

Examples

oo <- options(onetime.dir = tempdir(check = TRUE))
id <- sample(10000L, 1)

for (n in 1:3) {
  onetime_rlang_warn(c("rlang-style warning", i = "Extra info"), id = id)
}
#> Warning: rlang-style warning
#> ℹ Extra info

onetime_reset(id = id)
options(oo)