Package 'cargo'

Title: Functions to Define R Functions from Inlined Rust Code
Description: Dynamically define R functions with inlined 'Rust' code. Help is provided to run 'Cargo' <https://doc.rust-lang.org/cargo/> in a manner consistent with CRAN policies in R packages using 'Rust'. The package is not official, affiliated with, nor endorsed by the Rust project.
Authors: David B. Dahl [aut, cre]
Maintainer: David B. Dahl <[email protected]>
License: MIT + file LICENSE | Apache License 2.0
Version: 0.6.0
Built: 2025-02-10 05:29:14 UTC
Source: https://github.com/dbdahl/cargo-framework

Help Index

Install Rust Toolchain

Description

This function downloads the ‘⁠rustup⁠’ installer, run it, and adds targets to compile for all the CRAN build machines.

Usage

install(force = FALSE)

Arguments

force

If TRUE, installation proceeds without asking for user confirmation.

Value

Invisibly, TRUE if successful and FALSE otherwise.

Run Cargo

Description

This function runs Cargo (Rust's package manager) with the ... arguments passed as command line arguments.

Usage

run(
  ...,
  minimum_version = ".",
  search_methods = c("cache", "convention", "path"),
  leave_no_trace = FALSE,
  environment_variables = list(),
  rustflags = NULL,
  verbose = TRUE,
  run_twice = FALSE,
  stdout = "",
  stderr = ""
)

Arguments

...

Character vector of command line arguments passed to the cargo command.
minimum_version

A character string representing the minimum version of Rust that is needed. Or a path to the root of a package (i.e., the directory containing the DESCRIPTION file), in which case the value is found from the field: SystemRequirements: Cargo (>= XXXX). For the search_methods being "cache", the shell command rustup is used to upgrade the Cargo installation if needed.
search_methods

A character vector potentially containing values "path", "convention", and "cache". This indicates the methods to use (and their order) when searching for a suitable Cargo installation. "path" indicates to try to use base::Sys.which(). "convention" indicates to try to use the directories .cargo in the user's home directory. "cache" indicates to try to use the directory from the cargo package's own installation as given by the tools::R_user_dir('cargo', 'cache').
leave_no_trace

If TRUE, the CARGO_HOME environment variable is set to a temporary directory that is subsequently deleted.
environment_variables

A named character vector providing environment variables which should be temporarily set while running Cargo. Note that the CARGO_HOME and RUSTUP_HOME environment variables are automatically set when using the "cache" search method. Also, the CARGO_HOME environment variable is also set when leave_no_trace == TRUE.
rustflags

A character vector from which the CARGO_ENCODED_RUSTFLAGS environment variables is constructed and then temporarily set. Or, if NULL, this environment variable is left unchanged.
verbose

If TRUE, details of the search for Cargo are shown. If FALSE, no details are shown. If it is a connection, then details are shown and also written to the connection.
run_twice

Should the cargo command be run twice? The environment variable R_CARGO_RUN_COUNTER is set to either 1 or 2 during each run.
stdout

See argument of the same name in base::system2().
stderr

See argument of the same name in base::system2().

Value

The same value and behavior as the base::system2() function, except a non-zero exit code will be given in Cargo is not found.

Examples

if (run("--version") != 0) {
  message("Cargo is not installed. Please run cargo::install() in an interactive session.")
}

Define an R Function Implemented in Rust

Description

This function takes Rust code as a string from the last unnamed argument, takes variable names for all other unnamed arguments, compiles the Rust function, and wraps it as an R function.

Usage

rust_fn(
  ...,
  dependencies = character(0),
  minimum_version = "1.31.0",
  verbose = FALSE,
  cached = TRUE,
  longjmp = TRUE,
  invisible = FALSE,
  force = FALSE,
  which = NULL
)

Arguments

...

Rust code is taken as a string from the last unnamed argument, and variable names come for all other unnamed arguments. See example.
dependencies

A character vector of crate dependencies, e.g., c('rand = "0.8.5"','rand_pcg = "0.3.1"').
minimum_version

A character string representing the minimum version of Rust that is needed. Or a path to the root of a package (i.e., the directory containing the DESCRIPTION file), in which case the value is found from the field: SystemRequirements: Cargo (>= XXXX). For the search_methods being "cache", the shell command rustup is used to upgrade the Cargo installation if needed.
verbose

If TRUE, Cargo prints compilation details. If FALSE, Cargo is run in quiet mode, except for the first time this function is run. If "never", Cargo is always run in quiet mode. In any case, errors in code are always shown.
cached

Should Cargo use previously downloaded and compiled artifacts?
longjmp

Should the compiled function use the faster (but experimental) longjmp functionality when Rust code panics?
invisible

Should the compiled function return values invisibly?
force

If TRUE, write to cache directory on first usage without asking for user confirmation.
which

NULL or a vector of length one with name either 'tag' or 'branch' indicating the specific version of the roxido framework to use. If NULL, 'c(tag = "latest")' is used. This only has an effect when downloading artifacts (e.g., when cached = FALSE).

Value

An R function implemented with the supplied Rust code.