Forget about heredoc.

Author: pawchen

.github/workflows/publish_book.yml

@@ -36,33 +36,41 @@ jobs:
 
       - name: Optimize still images
         run: |
-          parallel -0 -a <(find pages/ \( -iname "*.png" -o -iname "*.jpg" -o -iname "*.jpeg" \) -print0) << 'EOF'
-            msg=$(cwebp -quiet -lossless -q 100 {} -o {.}.webp 2>&1 >/dev/null)
+          find pages/ \( -iname "*.png" -o -iname "*.jpg" -o -iname "*.jpeg" \) -print0 | \
+          parallel -0 '
+            file="{}"
+            output="{.}.webp"
+
+            err=$(cwebp -quiet -lossless -q 100 "$file" -o "$output" 2>&1 >/dev/null)
             status=$?
+
             if [ $status -eq 0 ]; then
-              rm {}
-              if [ -n "$msg" ]; then
-                echo "::notice::Optimized {}, but had warnings: $msg"
+              rm "$file"
+              if [ -n "$err" ]; then
+                echo "::notice::Optimized $file, but had warnings 👉 $err"
               fi
             else
-              echo "::warning::Skipped optimizing {} because $msg"
-            fi
-          EOF
+              echo "::warning::Skipped optimizing $file because 👉 $err"
+            fi'
 
       - name: Optimize gif images
         run: |
-          parallel -0 -a <(find pages/ -iname "*.gif" -print0) << 'EOF'
-            msg=$(gif2webp -quiet -min_size -q 100 {} -o {.}.webp 2>&1 >/dev/null)
+          find pages/ -iname "*.gif" -print0 | \  
+          parallel -0 '
+            file="{}"
+            output="{.}.webp"
+
+            msg=$(gif2webp -quiet -min_size -q 100 "$file" -o "$output" 2>&1 >/dev/null)
             status=$?
+
             if [ $status -eq 0 ]; then
               rm {}
               if [ -n "$msg" ]; then
-                echo "::notice::Optimized {}, but had warnings: $msg"
+                echo "::notice::Optimized {}, but had warnings 👉 $msg"
               fi
             else
-              echo "::warning::Skipped optimizing {} because $msg"
-            fi
-          EOF
+              echo "::warning::Skipped optimizing {} because 👉 $msg"
+            fi'
 
       - name: Optimize text
         run: |