Add linting action (#2431)

Fixes #2430

Author: hadley

.github/workflows/lint.yaml

@@ -0,0 +1,32 @@
+# 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: lint
+
+jobs:
+  lint:
+    runs-on: ubuntu-latest
+    env:
+      GITHUB_PAT: ${{ secrets.GITHUB_TOKEN }}
+    steps:
+      - uses: actions/checkout@v2
+
+      - uses: r-lib/actions/setup-r@v2
+        with:
+          use-public-rspm: true
+
+      - uses: r-lib/actions/setup-r-dependencies@v2
+        with:
+          packages: r-lib/lintr
+
+      - name: Lint
+        run: |
+          out <- lintr::lint_package()
+          print(out)
+          if (length(out)) stop("lints found")
+        shell: Rscript {0}

.lintr

@@ -0,0 +1,20 @@
+linters: funs <- c(
+    # Base messaging
+    "message" = "use cli::cli_inform()",
+    "warning" = "use cli::cli_warn()",
+    "stop" = "use cli::cli_abort()",
+    # rlang messaging
+    "inform" = "use cli::cli_inform()",
+    "warn" = "use cli::cli_warn()",
+    "abort" = "use cli::cli_abort()",
+    # older cli
+    "cli_alert_danger" = "use cli::cli_inform()",
+    "cli_alert_info" = "use cli::cli_inform()",
+    "cli_alert_success" = "use cli::cli_inform()",
+    "cli_alert_warning" = "use cli::cli_inform()"
+  )
+  list(lintr::undesirable_function_linter(
+    fun = funs,
+    symbol_is_undesirable = FALSE
+  ))
+encoding: "UTF-8"