[tmux] Use custom icon when in Ghostty

Author: dirn

.config/tmux/tmux.conf

@@ -113,10 +113,19 @@ set-option -g @catppuccin_pane_border_status "off"
 set-option -g @online_icon "ok"
 set-option -g @offline_icon "nok"
 
+# Detect terminal emulator by walking up the process tree
+run-shell 'tmux setenv -g TERMINAL_EMULATOR "$(pid=$(pgrep -o -x tmux); while [ $pid -gt 1 ]; do cmd=$(ps -o comm= -p $pid); ppid=$(ps -o ppid= -p $pid | tr -d " "); if echo "$cmd" | grep -q "MacOS/"; then basename "$cmd"; exit 0; fi; pid=$ppid; done)"'
+# Use TERMINAL_EMULATOR to set conditional values
+%if "#{==:#{TERMINAL_EMULATOR},ghostty}"
+    set-option -g @terminal_icon "👻"
+%else
+    set-option -g @terminal_icon ""
+%endif
+
 # status left look and feel
 set-option -g status-left-length 100
 set-option -g status-left ""
-set-option -ga status-left "#{?client_prefix,#{#[bg=#{@thm_red},fg=#{@thm_bg},bold]  #S },#{#[fg=#{@thm_green}]  #S }}"
+set-option -ga status-left "#{?client_prefix,#{#[bg=#{@thm_red},fg=#{@thm_bg},bold] #{@terminal_icon} #S },#{#[fg=#{@thm_green}] #{@terminal_icon} #S }}"
 
 set-option -g @cpu_low_fg_color "#[fg=#{@thm_green}]"
 set-option -g @cpu_medium_fg_color "#[fg=#{@thm_yellow}]"