tar_helper {targets}

Write a helper R script.

Description

Write a helper R script for a targets pipeline. Could be supporting functions or the target script file (default: ⁠_targets.R⁠) itself.

Usage

tar_helper(path = NULL, code = NULL, tidy_eval = TRUE, envir = parent.frame())

Arguments

path

Character of length 1, path to write (or overwrite) code. If the parent directory does not exist, tar_helper_raw() creates it.

code

Quoted code to write to path. tar_helper() overwrites the file if it already exists.

tidy_eval

Logical, whether to use tidy evaluation on code. If turned on, you can substitute expressions and symbols using ⁠!!⁠ and ⁠!!!⁠. See examples below.

envir

Environment for tidy evaluation.

Details

tar_helper() is a specialized version of tar_script() with flexible paths and tidy evaluation.

Value

NULL (invisibly)

See Also

Other scripts: tar_edit(), tar_github_actions(), tar_helper_raw(), tar_renv(), tar_script()

Examples

# Without tidy evaluation:
path <- tempfile()
tar_helper(path, x <- 1)
writeLines(readLines(path))
# With tidy evaluation:
y <- 123
tar_helper(path, x <- !!y)
writeLines(readLines(path))