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id_chr() gives you the name of the current target while make() is running. For static branching in drake_plan(), use the .id_chr symbol instead. See the examples for details.




The name of the current target.


drake_plan() understands special keyword functions for your commands. With the exception of target(), each one is a proper function with its own help file.

  • target(): give the target more than just a command. Using target(), you can apply a transformation (examples:, # nolint supply a trigger (, # nolint or set any number of custom columns.

  • file_in(): declare an input file dependency.

  • file_out(): declare an output file to be produced when the target is built.

  • knitr_in(): declare a knitr file dependency such as an R Markdown (*.Rmd) or R LaTeX (*.Rnw) file.

  • ignore(): force drake to entirely ignore a piece of code: do not track it for changes and do not analyze it for dependencies.

  • no_deps(): tell drake to not track the dependencies of a piece of code. drake still tracks the code itself for changes.

  • id_chr(): Get the name of the current target.

  • drake_envir(): get the environment where drake builds targets. Intended for advanced custom memory management.


try(id_chr()) # Do not use outside the plan.
#> Error : Could not find the environment where drake builds targets. Functions drake_envir(), id_chr(), cancel(), and cancel_if() can only be invoked through make().
if (FALSE) {
isolate_example("id_chr()", {
plan <- drake_plan(x = id_chr())
# Dynamic branching
plan <- drake_plan(
  x = seq_len(4),
  y = target(id_chr(), dynamic = map(x))
readd(y, subtargets = 1)
# Static branching
plan <- drake_plan(
  y = target(c(x, .id_chr), transform = map(x = !!seq_len(4)))