lintr

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Static code analysis for R

lintr
lintr

RStudio

lintr lints are automatically displayed in the RStudio Marker pane, Rstudio versions (> v0.99.206). RStudio Example

Emacs

lintr has built-in integration with flycheck versions greater than 0.23. Emacs Example

Installation

lintr is fully integrated into flycheck when using ESS. See the installalation documentation for those packages for more information.

Configuration

You can also configure what linters are used. e.g. using a different line length cutoff. - M-x customize-option -> flycheck-lintr-linters -> with_defaults(line_length_linter(120))

Vim

lintr can be integrated with syntastic for on the fly linting.

Vim Example
Vim Example

Installation

Put the file syntastic/lintr.vim in syntastic/syntax_checkers/r. If you are using pathogen this directory is ~/.vim/bundles/syntastic/syntax_checkers/r.

You will also need to add the following lines to your .vimrc.

let g:syntastic_enable_r_lintr_checker = 1
let g:syntastic_r_checkers = 1

Configuration

You can also configure what linters are used. e.g. using a different line length cutoff.

let g:syntastic_r_lintr_linters = "with_defaults(line_length_linter(120))"

Sublime Text 3

lintr can be integrated with Sublime Linter for on the fly linting.

Sublime Example
Sublime Example

Installation

Simply install sublimeLinter-contrib-lintr using Package Control.

For more information see Sublime Linter Docs

Configuration

You can also configure what linters are used. e.g. using a different line length cutoff. In the SublimeLinter User Settings

{
  "user": {
    "linters": {
      "r": {
        "linters": "with_defaults(line_length_linter(120))"
      }
    }
  }
}

Atom

lintr can be integrated with Linter for on the fly linting.

Atom Example
Atom Example

Installation

Simply install linter-lintr from within Atom or on the command line with:

apm install linter-lintr

For more information and bug reports see Atom linter-lintr.

Available linters

Project Configuration

Lintr supports per-project configuration of the following fields. The config file (default file name: .lintr) is in Debian Control Field Format.

An example file that uses 120 character line lengths, excludes a couple of files and sets different default exclude regexs follows.

linters: with_defaults(line_length_linter(120))
exclusions: list("inst/doc/creating_linters.R" = 1, "inst/example/bad.R", "tests/testthat/exclusions-test")
exclude: "# Exclude Linting"
exclude_start: "# Begin Exclude Linting"
exclude_end: "# End Exclude Linting"

With the following command, you can create a configuration file for lintr that ignores all linters that show at least one error:

library(magrittr)
library(dplyr)
lintr::lint_package() %>%
  as.data.frame %>%
  group_by(linter) %>%
  tally(sort = TRUE) %$%
  sprintf("linters: with_defaults(\n    %s\n    NULL\n  )\n",
          paste0(linter, " = NULL, # ", n, collapse="\n    ")) %>%
  cat(file = ".lintr")

The resulting configuration will contain each currently failing linter and the corresponding number of hits as a comment. Proceed by successively enabling linters, starting with those with the least number of hits. Note that this requires lintr 0.3.0.9001 or later.

Travis-CI

If you want to run lintr on Travis-CI you will need to have travis install the package first. This can be done by adding the following line to your .travis.yml

r_github_packages:
  - jimhester/lintr

Testthat

If you are already using testthat for testing simply add the following to your tests to fail if there are any lints in your project. You will have to add Suggests: lintr to your package DESCRIPTION as well.

if (requireNamespace("lintr", quietly = TRUE)) {
  context("lints")
  test_that("Package Style", {
    lintr::expect_lint_free()
  })
}

Non-failing Lints

If you do not want to fail the travis build on lints or do not use testthat you can simply add the following to your .travis.yml

after_success:
  - Rscript -e 'lintr::lint_package()'

In both cases the lintr-bot will add comments to the commit or pull request with the lints found and they will also be printed on Travis-CI or Wercker. If you want to disable the commenting you can set the environment variable LINTR_COMMENT_BOT=false.

Installation of development version

To install the latest development version of lintr from GitHub

devtools::install_github("jimhester/lintr")

References

Most of the default linters are based on Hadley Wickham’s R Style Guide.