targets: tar_helper – R documentation

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tar_helper

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)

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))

targets

Dynamic Function-Oriented 'Make'-Like Declarative Workflows

v0.10.0

MIT + file LICENSE

Authors

William Michael Landau [aut, cre] (<https://orcid.org/0000-0003-1878-3253>), Matthew T. Warkentin [ctb], Samantha Oliver [rev] (<https://orcid.org/0000-0001-5668-1165>), Tristan Mahr [rev] (<https://orcid.org/0000-0002-8890-5116>), Eli Lilly and Company [cph]

Initial release