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#' @title Static aggregation (raw version).
#' @export
#' @family branching
#' @description Like [tar_combine()] except the `name`, `command`,
#' and `pattern` arguments use standard evaluation.
#' @return A new target object to combine the return values
#' from the upstream targets.
#' See the "Target objects" section for background.
#' @inheritSection tar_map Target objects
#' @inheritParams targets::tar_target_raw
#' @param name Character, name of the new target.
#' @param ... One or more target objects or list of target objects.
#' Lists can be arbitrarily nested, as in `list()`.
#' @param command Expression object,
#' R command to aggregate the targets. Must contain
#' `!!!.x` where the arguments are to be inserted,
#' where `!!!` is the unquote splice operator from `rlang`.
#' @param use_names Logical, whether to insert the names of the targets
#' into the command when splicing.
#' @examples
#' if (identical(Sys.getenv("TAR_LONG_EXAMPLES"), "true")) {
#' targets::tar_dir({ # tar_dir() runs code from a temporary directory.
#' targets::tar_script({
#' target1 <- targets::tar_target(x, head(mtcars))
#' target2 <- targets::tar_target(y, tail(mtcars))
#' target3 <- tarchetypes::tar_combine(new_target_name, target1, target2)
#' list(target1, target2, target3)
#' })
#' targets::tar_manifest()
#' })
#' }
tar_combine_raw <- function(
name,
...,
command = expression(vctrs::vec_c(!!!.x)),
use_names = TRUE,
pattern = NULL,
packages = targets::tar_option_get("packages"),
library = targets::tar_option_get("library"),
format = targets::tar_option_get("format"),
repository = targets::tar_option_get("repository"),
iteration = targets::tar_option_get("iteration"),
error = targets::tar_option_get("error"),
memory = targets::tar_option_get("memory"),
garbage_collection = targets::tar_option_get("garbage_collection"),
deployment = targets::tar_option_get("deployment"),
priority = targets::tar_option_get("priority"),
resources = targets::tar_option_get("resources"),
storage = targets::tar_option_get("storage"),
retrieval = targets::tar_option_get("retrieval"),
cue = targets::tar_option_get("cue"),
description = targets::tar_option_get("description")
) {
tar_combine_impl(
name = name,
targets = unlist(list(...), recursive = TRUE),
command = command,
use_names = use_names,
pattern = pattern,
packages = packages,
library = library,
format = format,
repository = repository,
iteration = iteration,
error = error,
memory = memory,
garbage_collection = garbage_collection,
deployment = deployment,
priority = priority,
resources = resources,
storage = storage,
retrieval = retrieval,
cue = cue,
description = description
)
}
tar_combine_impl <- function(
name,
targets,
command,
use_names,
pattern,
packages,
library,
format,
repository,
iteration,
error,
memory,
garbage_collection,
deployment,
priority,
resources,
storage,
retrieval,
cue,
description
) {
targets::tar_assert_chr(name)
targets::tar_assert_target_list(targets)
names_chr <- map_chr(targets, ~.x$settings$name)
names_sym <- as_symbols(names_chr)
if (use_names) {
names(names_sym) <- names_chr
}
command <- targets::tar_tidy_eval(
command,
envir = list(.x = names_sym),
tidy_eval = TRUE
)
targets::tar_target_raw(
name = name,
command = command,
pattern = pattern,
packages = packages,
library = library,
format = format,
repository = repository,
iteration = iteration,
error = error,
memory = memory,
garbage_collection = garbage_collection,
deployment = deployment,
priority = priority,
resources = resources,
storage = storage,
retrieval = retrieval,
cue = cue,
description = description
)
}
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