Run a pipeline of targets.

Run the pipeline you defined in the targets script file (default: _targets.R). tar_make() runs the correct targets in the correct order and stores the return values in _targets/objects/.

tar_make(
  names = NULL,
  shortcut = targets::tar_config_get("shortcut"),
  reporter = targets::tar_config_get("reporter_make"),
  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

names	Names of the targets to build or check. Set to NULL to check/build all the targets (default). Otherwise, you can supply tidyselect helpers like all_of() and starts_with(). Because tar_make() and friends run the pipeline in a new R session, if you pass a character vector to a tidyselect helper, you will need to evaluate that character vector early with !!, e.g. tar_make(names = all_of(!!your_vector)). Applies to ordinary targets (stem) and whole dynamic branching targets (patterns) but not to individual dynamic branches.
shortcut	Logical of length 1, how to interpret the names argument. If shortcut is FALSE (default) then the function checks all targets upstream of names as far back as the dependency graph goes. shortcut = TRUE increases speed if there are a lot of up-to-date targets, but it assumes all the dependencies are up to date, so please use with caution. It relies on stored metadata for information about upstream dependencies. shortcut = TRUE only works if you set names.
reporter	Character of length 1, name of the reporter to user. Controls how messages are printed as targets run in the pipeline. Defaults to tar_config_get("reporter_make"). Choices: "verbose": print one message for each target that runs (default). "silent": print nothing. "timestamp": print a time-stamped message for each target that runs. "summary": print a running total of the number of each targets in each status category (queued, started, skipped, build, canceled, or errored). Also show a timestamp ("%H:%M %OS2" strptime() format) of the last time the progress changed and printed to the screen.
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

NULL except if callr_function = callr::r_bg(), in which case a handle to the callr background process is returned. Either way, the value is invisibly returned.

See also

Other pipeline: tar_make_clustermq(), tar_make_future()

Examples

tar_dir({ # tar_dir() runs code from a temporary directory.
tar_script({
  tar_option_set()
  list(tar_target(x, 1 + 1))
})
tar_make()
tar_script({
  tar_option_set()
  list(
    tar_target(y1, 1 + 1),
    tar_target(y2, 1 + 1),
    tar_target(z, y1 + y2)
  )
}, ask = FALSE)
prefix <- "y"
tar_make(starts_with(!!prefix)) # Only builds y1 and y2.
})
#> • start target x
#> • built target x
#> • end pipeline
#> • start target y1
#> • built target y1
#> • start target y2
#> • built target y2
#> • end pipeline
#>