Error out with classed condition

[alexverse]

Using rlang::abort() we can create classed conditions using the class param that can be caught or handled selectively, allowing for finer-grained error handling. This can be useful for Rmarkdown reports that execute pipelines and shiny apps that control targets workflows.

Is there a way to error out with classed conditions from targets pipeline? for example something like:

library(targets)
list(
  tar_target(
    name = abort,
    command = rlang::abort("FOO", class = "foo_error")
  )
)

and when calling tar_make():

tryCatch({
  targets::tar_make()
}, foo_error = function(e) {
  rlang::inform("foo handled")
})

[wlandau]

That sounds reasonable. See 381d967 for an implementation.

[alexverse]

Great! Changes in main are OK for custom error classes!
Thank you 🎄

[alexverse]

With these changes we can also use a custom error handling with base R:

library(targets)
list(
  tar_target(
    name = abort,
    command = stop(errorCondition("foo", class = "foo_error"))
  )
)

and then:

tryCatch({
  targets::tar_make()
}, foo_error = function(e) {
  message("foo handled")
})