Run shinytests2 only if the modules are affected

.github/workflows/build-check-install.yaml

@@ -294,7 +294,6 @@ jobs:
         uses: actions/[email protected]
         if: github.event_name == 'pull_request'
         with:
-          ref: ${{ steps.branch-name.outputs.head_ref_branch }}
           path: ${{ github.event.repository.name }}
           repository: ${{ github.event.pull_request.head.repo.full_name }}
           fetch-depth: 0
@@ -515,6 +514,52 @@ jobs:
           path: "${{ inputs.additional-caches }}"
           key: additional-caches-${{ runner.os }}
 
+      - name: Check only affected modules 🎯
+        if: startsWith(${{ github.event.repository.name }}, 'teal.modules.') && github.event_name == 'pull_request'
+        run: |
+          # Set working directory where the git repo is
+          cd ${{ github.event.repository.name }}/${{ inputs.package-subdirectory }}
+
+          # Debugging
+
+
+          # Get the list of R files that have changed
+          # https://github.com/cloudnativeto/envoy/blob/de67446fa8af973761bb4716f5143d73643baf8b/.github/workflows/get_build_targets.sh_bak#L9
+          files=$(git diff --name-only HEAD FETCH_HEAD -- tests/* R/*.R)
+
+          # Base directories
+          src_dir="R/"
+          test_dir="tests/testthat/"
+
+          # Loop through each modified file and determine which tests to run
+          for file in $files; do
+
+              # Extract the base name of the file, examples:
+              # tests/testthat/test-shinytest2-foo.R -> foo
+              # R/foo.R -> foo
+              base_name=$(basename "$file" .R | sed s/test-shinytest2-//g)
+              # Find matching test files (parenthesis to not match arguments)
+              test_files=$(grep -l "$base_name(" "$test_dir"test-shinytest2-*.R)
+              td=$TESTING_DEPTH
+
+              # Modify in place so that only modified modules are tested.
+              if [[ -n "$test_files" ]]
+              then {
+                  sed -i 's/skip_if_too_deep(5)/skip_if_too_deep(3)/g' "$test_files"
+                  TESTING_DEPTH=3
+              } else {
+                  # Flag for helpers
+                  helper_modified="yes"
+              } fi
+
+              # R file without corresponding test file: reset the testing depth
+              if [[ -n "$helper_modified" ]]
+              then {
+                  TESTING_DEPTH=td
+              } fi
+          done
+        shell: bash
+
       - name: Build R package 🏗
         run: |
           if [ "${{ inputs.additional-env-vars }}" != "" ]