use local options for custom indicator

Author: MunifTanjim

README.md

@@ -88,22 +88,22 @@ set -g @mode_indicator_empty_mode_style 'bg=cyan,fg=black'
 
 ### Custom Indicator
 
-You can override the indicator at any time by setting these variables:
+You can override the indicator at any time by setting these options:
 
 ```ini
 # prompt to display instead of default mode indicators
-set -g @mode_indicator_custom_prompt ' ---- '
+set @mode_indicator_custom_prompt ' ---- '
 
 # style values for custom prompt
-set -g @mode_indicator_custom_mode_style 'default'
+set @mode_indicator_custom_mode_style 'default'
 ```
 
-To revert back to the default mode indicators, unset those variables:
+To revert back to the default mode indicators, unset those options:
 
 ```ini
-set -gu @mode_indicator_custom_prompt
+set -u @mode_indicator_custom_prompt
 
-set -gu @mode_indicator_custom_mode_style
+set -u @mode_indicator_custom_mode_style
 ```
 
 ## License

mode_indicator.tmux

@@ -38,8 +38,8 @@ init_tmux_mode_indicator() {
     empty_style=$(indicator_style "$empty_mode_style_config" "bg=cyan,fg=black")
 
   local -r \
-    custom_prompt="#(tmux show-option -gqv $custom_prompt_config)" \
-    custom_style="#(tmux show-option -gqv $custom_mode_style_config)"
+    custom_prompt="#(tmux show-option -t #S -qv $custom_prompt_config)" \
+    custom_style="#(tmux show-option -t #S -qv $custom_mode_style_config)"
 
   local -r \
     mode_prompt="#{?#{!=:$custom_prompt,},$custom_prompt,#{?client_prefix,$prefix_prompt,#{?pane_in_mode,$copy_prompt,#{?pane_synchronized,$sync_prompt,$empty_prompt}}}}" \