fix: pipe logic

Signed-off-by: Jason C. Leach <[email protected]>

.github/workflows/actions/early-exit-check/action.yml

@@ -9,19 +9,30 @@ runs:
     - name: Check location of changed files
       shell: bash
       run: |
-        # On main branch, compare with the previous
-        # commit otherwise (for PRs) compare with the
-        # current commit.
-        if [ "${GITHUB_REF_NAME}" = "main" ]; then
-          end_ref="HEAD^"
+        set -x
+
+        if [ "${GITHUB_REF_NAME}" = "main" ]; then 
+          # On main branch, compare with the previous
+          # commit otherwise (for PRs) compare with the
+          # current commit.
+          parent_ref="${GITHUB_REF_NAME}^"
+          child_ref="${GITHUB_SHA}"
         else
-          end_ref="HEAD"
+          # On PRs, compare with the base branch.
+          parent_ref="origin/${GITHUB_BASE_REF:-main}"
+          child_ref="HEAD"
         fi
 
-        echo "Comparing origin/${GITHUB_BASE_REF:-HEAD} with ${end_ref}"
+        echo "Comparing ${parent_ref} with ${child_ref}"
 
-        change_count=$(git diff --name-only origin/${GITHUB_BASE_REF:-HEAD}..${end_ref} | grep -E '^(app/.*)|(.yarn/.*)|(.github/workflows/.*)' | wc -l | awk '{$1=$1};1')
+        change_count=$(
+          git diff --name-only $parent_ref..$child_ref | \
+          grep -E '^(app/.*)|(.yarn/.*)|(.github/workflows/.*)' || true | \
+          wc -l | \
+          awk '{$1=$1};1'
+        )
         echo "$change_count files changed in app, .yarn, or .github/workflows"
+
         if [ $change_count -gt 0 ]; then
           # A result greater than 0 means there are changes
           # in the specified directories.