Update 2024-01-23-thermal.md

_posts/2024-01-23-thermal.md

@@ -34,3 +34,25 @@ if ! printf '\x1B\x40\x1B\x21\x08\x1B\x61\x01%s\x0A\x0A\x0A\x1B\x69' "$converted
 fi
 
 ```
+
+# reverse white printing
+
+```
+
+if ! command -v xclip &>/dev/null; then
+  echo "xclip could not be found."
+  exit 1
+fi
+
+clipboard_content="$(xclip -o -selection clipboard)" 
+
+escaped_content=$(sed 's/%/%%/g' <<<"$clipboard_content") 
+
+converted_text=$(iconv -f UTF-8 -t CP850//TRANSLIT//IGNORE <<<"$escaped_content" 2>/dev/null)
+
+if ! printf '\x1A\x5B\x01\x00\x00\x00\x00\x40\x02\xB0\x04\x00\x1A\x54\x01\x00\x00\x00\x00\x18\x00\x04\x00%s\x00\x1A\x5D\x00\x1A\x4F\x00\x1B\x69' "$converted_text" | lp -d thermal -o raw; then
+  echo "Failed to print. Please check the printer and its configuration."
+  exit 1
+fi
+
+```