id_chr {drake}

Name of the current target

Description

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.

Usage

id_chr()

Value

The name of the current target.

Keywords

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: ⁠https://books.ropensci.org/drake/plans.html#large-plans⁠), # nolint supply a trigger (⁠https://books.ropensci.org/drake/triggers.html⁠), # 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.

Examples

try(id_chr()) # Do not use outside the plan.
## Not run: 
isolate_example("id_chr()", {
plan <- drake_plan(x = id_chr())
make(plan)
readd(x)
# Dynamic branching
plan <- drake_plan(
  x = seq_len(4),
  y = target(id_chr(), dynamic = map(x))
)
make(plan)
readd(y, subtargets = 1)
# Static branching
plan <- drake_plan(
  y = target(c(x, .id_chr), transform = map(x = !!seq_len(4)))
)
plan
})

## End(Not run)