Update latexdiff.yml

.github/workflows/latexdiff.yml

@@ -18,6 +18,11 @@ jobs:
       options: --user root
 
     steps:
+      - name: Install latexpand (Perl script)
+        run: |
+          tlmgr init-usertree
+          tlmgr install latexpand
+        
       - name: Checkout base branch
         uses: actions/checkout@v4
         with:
@@ -30,34 +35,29 @@ jobs:
           ref: ${{ github.event.inputs.compare_branch }}
           path: compare
 
-      - name: Install flatex (in a virtualenv)
-        run: |
-          python3 -m venv /tmp/latex-venv
-          . /tmp/latex-venv/bin/activate
-          pip install flatex
-          ln -s /tmp/latex-venv/bin/flatex /usr/local/bin/flatex
 
       - name: Create output folder
         run: mkdir -p diff_output
 
-      - name: Flatten base/main.tex
+      - name: Flatten base/main.tex (with latexpand)
         run: |
           cd base/latex
           echo "📂 Listing files in base/latex:"
           ls -R
-          echo "🔄 Flattening base/latex/main.tex..."
-          flatex main.tex ../../diff_output/base_flat.tex
-          echo "✅ base_flat.tex preview:"
+          echo "🔄 Flattening with latexpand..."
+          latexpand --verbose --keep-comments --output=../../diff_output/base_flat.tex main.tex
+          echo "✅ Preview of base_flat.tex:"
           head -n 50 ../../diff_output/base_flat.tex
 
-      - name: Flatten compare/main.tex
+
+      - name: Flatten compare/main.tex (with latexpand)
         run: |
           cd compare/latex
           echo "📂 Listing files in compare/latex:"
           ls -R
-          echo "🔄 Flattening compare/latex/main.tex..."
-          flatex main.tex ../../diff_output/compare_flat.tex
-          echo "✅ compare_flat.tex preview:"
+          echo "🔄 Flattening with latexpand..."
+          latexpand --verbose --keep-comments --output=../../diff_output/compare_flat.tex main.tex
+          echo "✅ Preview of compare_flat.tex:"
           head -n 50 ../../diff_output/compare_flat.tex
 
       - name: Generate diff.tex using latexdiff