Add CGAL setup script for header-only installation

Author: krystophny

scripts/setup/cgal.sh

@@ -0,0 +1,49 @@
+#!/usr/bin/env bash
+# CGAL setup script - downloads and installs CGAL header-only library
+# CGAL 5.x is header-only and only requires Boost headers
+
+set -e
+
+cd "$CODE/external" || exit 1
+
+CGAL_VERSION="5.6.1"
+CGAL_DIR="CGAL-${CGAL_VERSION}"
+CGAL_INSTALL="$CODE/external/cgal"
+
+if [ ! -d "$CGAL_INSTALL/include/CGAL" ]; then
+    echo "Fetching and installing CGAL ${CGAL_VERSION}..."
+
+    # Download CGAL
+    if [ ! -d "$CGAL_DIR" ]; then
+        echo "Downloading CGAL ${CGAL_VERSION}..."
+        curl -L "https://github.com/CGAL/cgal/releases/download/v${CGAL_VERSION}/CGAL-${CGAL_VERSION}.tar.xz" -o "CGAL-${CGAL_VERSION}.tar.xz"
+        tar xf "CGAL-${CGAL_VERSION}.tar.xz"
+        rm "CGAL-${CGAL_VERSION}.tar.xz"
+    fi
+
+    # Create install directory structure
+    mkdir -p "$CGAL_INSTALL"
+
+    # CGAL 5.x is header-only, just copy headers and cmake files
+    echo "Installing CGAL headers..."
+    cp -r "$CGAL_DIR/include" "$CGAL_INSTALL/"
+
+    # Copy CMake configuration files
+    mkdir -p "$CGAL_INSTALL/lib/cmake/CGAL"
+    cp -r "$CGAL_DIR/lib/cmake/CGAL/"* "$CGAL_INSTALL/lib/cmake/CGAL/"
+
+    # Clean up source directory
+    rm -rf "$CGAL_DIR"
+
+    echo "CGAL ${CGAL_VERSION} installed to $CGAL_INSTALL"
+else
+    echo "CGAL already installed at $CGAL_INSTALL"
+fi
+
+# Print usage instructions
+echo ""
+echo "To use CGAL with CMake, add to your cmake command:"
+echo "  -DCGAL_DIR=$CGAL_INSTALL/lib/cmake/CGAL"
+echo ""
+echo "Or set environment variable:"
+echo "  export CGAL_DIR=$CGAL_INSTALL/lib/cmake/CGAL"