add test for codetools

.Rbuildignore

@@ -1,3 +1,4 @@
 ^.*\.Rproj$
 ^\.Rproj\.user$
 ^README\.Rmd$
+^\.github$

.github/.gitignore

@@ -0,0 +1 @@
+*.html

.github/workflows/R-CMD-check.yaml

@@ -0,0 +1,52 @@
+# Workflow derived from https://github.com/r-lib/actions/tree/v2/examples
+# Need help debugging build failures? Start at https://github.com/r-lib/actions#where-to-find-help
+on:
+  push:
+    branches: [main, master]
+  pull_request:
+    branches: [main, master]
+
+name: R-CMD-check.yaml
+
+permissions: read-all
+
+jobs:
+  R-CMD-check:
+    runs-on: ${{ matrix.config.os }}
+
+    name: ${{ matrix.config.os }} (${{ matrix.config.r }})
+
+    strategy:
+      fail-fast: false
+      matrix:
+        config:
+          - {os: macos-latest,   r: 'release'}
+          - {os: windows-latest, r: 'release'}
+          - {os: ubuntu-latest,   r: 'devel', http-user-agent: 'release'}
+          - {os: ubuntu-latest,   r: 'release'}
+          - {os: ubuntu-latest,   r: 'oldrel-1'}
+
+    env:
+      GITHUB_PAT: ${{ secrets.GITHUB_TOKEN }}
+      R_KEEP_PKG_SOURCE: yes
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: r-lib/actions/setup-pandoc@v2
+
+      - uses: r-lib/actions/setup-r@v2
+        with:
+          r-version: ${{ matrix.config.r }}
+          http-user-agent: ${{ matrix.config.http-user-agent }}
+          use-public-rspm: true
+
+      - uses: r-lib/actions/setup-r-dependencies@v2
+        with:
+          extra-packages: any::rcmdcheck
+          needs: check
+
+      - uses: r-lib/actions/check-r-package@v2
+        with:
+          upload-snapshots: true
+          build_args: 'c("--no-manual","--compact-vignettes=gs+qpdf")'

README.Rmd

@@ -3,6 +3,10 @@ title: dotty
 output: github_document
 ---
 
+<!-- badges: start -->
+[![R-CMD-check](https://github.com/kevinushey/dotty/actions/workflows/R-CMD-check.yaml/badge.svg)](https://github.com/kevinushey/dotty/actions/workflows/R-CMD-check.yaml)
+<!-- badges: end -->
+
 Destructuring assignments in R with the `.` object.
 
 

README.md

@@ -1,6 +1,11 @@
 dotty
 ================
 
+<!-- badges: start -->
+
+[![R-CMD-check](https://github.com/kevinushey/dotty/actions/workflows/R-CMD-check.yaml/badge.svg)](https://github.com/kevinushey/dotty/actions/workflows/R-CMD-check.yaml)
+<!-- badges: end -->
+
 Destructuring assignments in R with the `.` object.
 
 ### Usage
@@ -45,24 +50,19 @@ c(x, y, z)
 c(major, minor, patch)
 ```
 
-    ## [1] 4 2 2
-
-``` r
-# compute on values in object -- this is probably too magical
-.[total = sum(a)] <- list(a = 1:5)
-total
-```
-
-    ## [1] 15
+    ## [1] 4 4 1
 
 ### R CMD check
 
 If you’d like to use `dotty` in your CRAN package, you can avoid
 `R CMD check` warnings by including a file called `R/zzz.R` with the
 contents:
 
-    dotty::dotify()
+    .onLoad <- function(libname, pkgname) {
+      dotty::dotify()
+    }
 
-This function will search for usages of `dotty`, and call
-`utils::globalVariables()` to assert to `R CMD check` that such
-variables are valid for use.
+This function patches
+[codetools](https://cran.r-project.org/package=codetools) so that
+variables usages in `.` expressions can be linted as though those were
+regular bindings / assignments.

tests/testthat/test-dot.R

@@ -81,3 +81,23 @@ test_that("we can destructure R versions", {
   expect_equal(minor, unclass(version)[[1L]][[2L]])
   expect_equal(patch, unclass(version)[[1L]][[3L]])
 })
+
+test_that("dotify helps codetools understand dotty usages", {
+
+  skip_if_not_installed("codetools")
+
+  example <- function() {
+    .[apple, banana] <- c(1, 2)
+    c(apple, banana, cherry)
+  }
+
+  messages <- ""
+  result <- codetools::checkUsage(example, report = function(x) {
+    messages <<- paste(messages, x, sep = "")
+  })
+
+  expect_false(grepl("apple", messages))
+  expect_false(grepl("banana", messages))
+  expect_true(grepl("cherry", messages))
+
+})