Add extra-packages option

setup-r-dependencies/README.md

@@ -13,7 +13,8 @@ This action install dependencies for the current R environment based on the DESC
 
 See [action.yml](action.yml)
 
-The only input is `cache-version`, which defaults to 1. If you need to invalidate the existing cache pass any other number and a new cache will be used.
+- `cache-version` - default `1`. If you need to invalidate the existing cache pass any other number and a new cache will be used.
+- `extra-packages` - One or more extra package references to install. Separate each reference by newlines or commas for more than one package.
 
 Basic:
 ```yaml
@@ -23,6 +24,9 @@ steps:
 - uses: r-lib/actions/setup-r-dependencies@v1
   with:
     cache-version: 2
+    extra-packages: |
+      ggplot2
+      rcmdcheck
 ```
 
 # License

setup-r-dependencies/action.yaml

@@ -6,6 +6,8 @@ inputs:
     description: 'The version of the cache, change this from the default (1) to start over with a fresh cache'
     required: true
     default: 1
+  extra-packages:
+    description: 'Any extra packages to install outside of the packages listed in the dependencies'
 runs:
   using: "composite"
   steps:
@@ -31,19 +33,17 @@ runs:
           key: ${{ steps.get-version.outputs.os-version }}-${{ steps.get-version.outputs.r-version }}-${{inputs.cache-version }}-${{ hashFiles('.github/r-depends.rds') }}
           restore-keys: ${{ steps.get-version.outputs.os-version }}-${{ steps.get-version.outputs.r-version }}-${{inputs.cache-version }}-
 
-      - name: Install system dependencies
+      - name: Install dependencies
         run: |
+          local_deps <- pak::local_dev_deps(dependencies = TRUE)[["ref"]]
+          extra_deps <- strsplit("${{ inputs.extra-packages }}", "[[:space:],]+")[[1]]
           if (Sys.info()[["sysname"]] == "Linux") {
             pak::local_system_requirements(execute = TRUE)
-            pak::pkg_system_requirements("rcmdcheck", execute = TRUE)
+            for (dep in extra_deps) {
+              pak::pkg_system_requirements(dep, execute = TRUE)
+            }
           }
-        shell: Rscript {0}
-
-      - name: Install dependencies
-        run: |
-          options(pak.no_extra_messages = TRUE)
-          pak::local_install_dev_deps(upgrade = TRUE)
-          pak::pkg_install("sessioninfo")
+          pak::pkg_install(c(local_deps, extra_deps, "sessioninfo"))
         shell: Rscript {0}
 
       - name: Session info