Analyze the pipeline defined in the target script file (default: _targets.R) and return the vertices and edges of the directed acyclic graph of dependency relationships.

tar_network(
  targets_only = FALSE,
  reporter = targets::tar_config_get("reporter_outdated"),
  callr_function = callr::r,
  callr_arguments = targets::callr_args_default(callr_function, reporter),
  envir = parent.frame(),
  script = targets::tar_config_get("script"),
  store = targets::tar_config_get("store")
)

Arguments

targets_only

Logical, whether to restrict the output to just targets (FALSE) or to also include imported global functions and objects.

reporter

Character of length 1, name of the reporter to user. Controls how messages are printed as targets are checked. Choices:

  • "silent": print nothing.

  • "forecast": print running totals of the checked and outdated targets found so far.

callr_function

A function from callr to start a fresh clean R process to do the work. Set to NULL to run in the current session instead of an external process (but restart your R session just before you do in order to clear debris out of the global environment). callr_function needs to be NULL for interactive debugging, e.g. tar_option_set(debug = "your_target"). However, callr_function should not be NULL for serious reproducible work.

callr_arguments

A list of arguments to callr_function.

envir

An environment, where to run the target R script (default: _targets.R) if callr_function is NULL. Ignored if callr_function is anything other than NULL. callr_function should only be NULL for debugging and testing purposes, not for serious runs of a pipeline, etc.

The envir argument of tar_make() and related functions always overrides the current value of tar_option_get("envir") in the current R session just before running the target script file, so whenever you need to set an alternative envir, you should always set it with tar_option_set() from within the target script file. In other words, if you call tar_option_set(envir = envir1) in an interactive session and then tar_make(envir = envir2, callr_function = NULL), then envir2 will be used.

script

Character of length 1, path to the target script file. Defaults to tar_config_get("script"), which in turn defaults to _targets.R. When you set this argument, the value of tar_config_get("script") is temporarily changed for the current function call. See tar_script(), tar_config_get(), and tar_config_set() for details about the target script file and how to set it persistently for a project.

store

Character of length 1, path to the targets data store. Defaults to tar_config_get("store"), which in turn defaults to _targets/. When you set this argument, the value of tar_config_get("store") is temporarily changed for the current function call. See tar_config_get() and tar_config_set() for details about how to set the data store path persistently for a project.

Value

A list with two data frames: vertices and edges. The vertices data frame has one row per target with fields to denote the type of the target or object (stem, branch, map, cross, function, or object) and the target's status (up to date, outdated, started, canceled, or errored). The edges data frame has one row for every edge and columns to and from to mark the starting and terminating vertices.

See also

Examples

if (identical(Sys.getenv("TAR_EXAMPLES"), "true")) { tar_dir({ # tar_dir() runs code from a temporary directory. tar_script({ tar_option_set() list( tar_target(y1, 1 + 1), tar_target(y2, 1 + 1), tar_target(z, y1 + y2) ) }, ask = FALSE) tar_network(targets_only = TRUE) }) }