Extract individual pages

Author: Johennes

.github/workflows/generate-images-drawio.yml

@@ -23,11 +23,11 @@ jobs:
       - name: Check out repository
         uses: actions/checkout@v4
 
-      - name: Set up Xvfb & draw.io desktop
+      - name: Set up xmlstarlet, Xvfb & draw.io desktop
         run: |
             wget -q https://github.com/jgraph/drawio-desktop/releases/download/v${{ env.DRAWIO_VERSION }}/drawio-amd64-${{ env.DRAWIO_VERSION }}.deb
             sudo apt-get update
-            sudo apt-get install --yes --no-install-recommends xvfb ./drawio-amd64-${{ env.DRAWIO_VERSION }}.deb
+            sudo apt-get install --yes --no-install-recommends xmlstarlet xvfb ./drawio-amd64-${{ env.DRAWIO_VERSION }}.deb
 
       - name: Prepare output folder
         run: |
@@ -40,15 +40,22 @@ jobs:
           export DISPLAY=:42
           Xvfb :42 -nolisten unix &
 
-          for ext in png svg; do
-            # The chromium args need to be specified last because of whatever
-            drawio --export --recursive --format $ext "${{ env.DRAWIO_SRC }}" --no-sandbox --disable-gpu --disable-dev-shm-usage
+          while read -r file; do
+            page=0
 
-            rsync -v --recursive --include="*.$ext" --filter="-! */" "${{ env.DRAWIO_SRC }}"/* "${{ env.DRAWIO_OUT }}"
+            while read -r pagename; do
+              for ext in png svg; do
+                # The chromium args need to be specified last because of whatever
+                drawio --export -p $page -o "${file/.drawio/-$pagename}.$ext" "$file" --no-sandbox --disable-gpu --disable-dev-shm-usage
+              done
 
-            # Nuke the exported files so that draw.io desktop doesn't attempt to use them as input files on the next loop pass
-            find "${{ env.DRAWIO_SRC }}" -name "*.$ext" -exec rm -v "{}" \;  
-          done
+              page=$((page + 1))
+
+            # For whatever reason xmlstarlet doesn't end its output with a newline so we append one with echo to not lose the last line
+            done < <(xml sel -t -v "//diagram/@name" "$file"; echo)
+          done < <(find "${{ env.DRAWIO_SRC }}" -name "*.drawio")
+
+          rsync -v --recursive --include="*.png" --include="*.svg" --filter="-! */" "${{ env.DRAWIO_SRC }}"/* "${{ env.DRAWIO_OUT }}"
 
       - name: Add & Commit
         uses: EndBug/add-and-commit@v9