add rofi calculator

.config/rofi/config.rasi

@@ -9,6 +9,7 @@ configuration {
   display-nerdfont: " 󰞅 nerd-font ";
   display-emoji: "  emoji ";
   display-clipboard: " 󰆏 clipboard ";
+  display-calc: " 󰇽 calculator ";
   show-icons: true;
   drun-display-format: "{icon} {name}";
   sidebar-mode: true;

.config/sxhkd/sxhkdrc

@@ -20,7 +20,7 @@ super + n
 
 # clipboard manager
 super + c
-	rofi -modi "clipboard:greenclip print" -show clipboard -run-command '{cmd}'
+	rofi -modi "clipboard:greenclip print,calc" -show clipboard -run-command '{cmd}' -no-show-match -no-sort -calc-command "echo -n '{result}' | xclip -selection clipboard"
 
 # power menu
 super + p