[cliplumber] Add rot13 feature

bin/cliplumber

@@ -29,7 +29,7 @@ fi
 urls="$(echo $clip | grep -o 'https\?://[a-zA-Z0-9~#%&_+=,.?/-]\+')"
 
 # Check the requirements for every option
-opts=""
+opts="rot13"
 check_exists "$TERM_EMU" "mpv" "youtube-dl" &&
     opts="$(printf "audio-search\n%s" "$opts")"
 check_exists "dragon" &&
@@ -67,6 +67,13 @@ case "$choice" in
     "audio-search")
         "$TERM_EMU" --single-instance mpv --ytdl-format=bestaudio ytdl://ytsearch:"$clip"
         ;;
+    "rot13")
+        if [ -z "$WAYLAND_DISPLAY" ]; then
+            xsel -b -o | tr 'A-Za-z' 'N-ZA-Mn-za-m' | xsel -b -i
+        else
+            wl-copy -n "$(wl-paste | tr 'A-Za-z' 'N-ZA-Mn-za-m')"
+        fi
+        ;;
     *)
         printf 'Nope\n'
         ;;