R

Recognised by .R sources (and, once the project is known to be R, .r files, which REBOL uses too; R Markdown, Quarto, Sweave, Rd and RStudio project files are files of the ecosystem with no language of their own) and by an R package's DESCRIPTION with a Package: field. <package>.Rcheck directories are build trees.

CI runs R code in three ways, read alike: Rscript -e "covr::codecov()" (or R -e), a step whose shell: Rscript {0} runs its script, and the r-lib/actions, whose check-r-package runs rcmdcheck with its inputs.

tests-run

testthat's files (test_that() in tests/testthat/test-*.R) or tinytest's (inst/tinytest/test_*.R), run by R CMD check (which runs the tests), rcmdcheck::rcmdcheck() or r-lib/actions/check-r-package, devtools::test() or devtools::check(), testthat::test_local() and its kin, or tinytest::test_package().

coverage

covr counts lines, the finest R has: covr::package_coverage(), or the reports and uploads built on it (covr::codecov(), covr::coveralls(), covr::report(), covr::to_cobertura()).

platform-matrix

The toolchains are R versions: r-lib/actions/setup-r's r-version (release, devel, oldrel-1, or a version), or a rocker image (rocker/r-ver:4.4.1, rocker/tidyverse, rocker/verse) or r-base image.

compiler-warnings

R has no compiler warnings; lintr's lints stand in. lintr::lint_package() runs in CI and fails on a lint, which it does only with LINTR_ERROR_ON_LINT=true (as r-lib's example workflow sets it) or error_on_lint = TRUE; the lintr pre-commit hook fails by itself.

warnings-as-errors

The package check fails on a WARNING (or a NOTE): rcmdcheck::rcmdcheck(error_on = "warning"), which r-lib/actions/check-r-package does by default. R CMD check alone fails only on an ERROR.

code-formatting

air: air format --check . fails on a file it would change, plain air format . rewrites; air.toml is optional. styler (styler::style_pkg(), or the style-files pre-commit hook) only rewrites, which counts where the job fails on git diff --exit-code or commits the changes.

static-analysis

lintr, with the linters .lintr names (its defaults without).

function-limits

lizard parses R, so CI runs it with a length limit.

committed-artifacts

.Rhistory, .RData, .Rproj.user/ and *.Rcheck/.

vcs-ignore

.Rhistory, .RData, .Rproj.user/ and *.Rcheck/, each.

Not judged

R is interpreted, so hardening, cxx-extensions and ci-build-types do not apply, and nor does type-checking; no code security scanner or dependency auditor the validator knows reads R, and a lock file (renv.lock) belongs to an analysis or an application rather than a package (dependency-management); no fuzzer or mutation testing tool the validator knows runs R tests.