Fix cache

.githooks/pre-commit

@@ -0,0 +1,19 @@
+#!/bin/bash
+# Cache-busting: update ?v= query param in all HTML files when CSS/JS change.
+# Version = first 8 chars of a combined hash of style.css + main.js.
+
+REPO_ROOT=$(git rev-parse --show-toplevel)
+CSS="$REPO_ROOT/css/style.css"
+JS="$REPO_ROOT/js/main.js"
+
+VERSION=$(cat "$CSS" "$JS" | git hash-object --stdin | cut -c1-8)
+
+HTML_FILES=$(find "$REPO_ROOT" -name "index.html" -not -path "*/raw/*")
+
+for file in $HTML_FILES; do
+  sed -i -E "s|(\.\.\/)?css/style\.css(\?v=[^\"']*)?|\1css/style.css?v=$VERSION|g" "$file"
+  sed -i -E "s|(\.\.\/)?js/main\.js(\?v=[^\"']*)?|\1js/main.js?v=$VERSION|g" "$file"
+  git add "$file"
+done
+
+echo "Cache-bust version: $VERSION"