Nested tmux sessions

tmux.conf

### Nested sessions (YO DAWG)

# Source: <https://www.freecodecamp.org/news/tmux-in-practice-local-and-nested-remote-tmux-sessions-4f7ba5db8795/>

# TODO - remove
color_status_text="colour245"
color_window_off_status_bg="colour238"
color_light="white" #colour015
color_dark="colour232" # black= colour232
color_window_off_status_current_bg="colour254"

# While inside of a tmux-within-a-tmux, F12 will tell the outer session to
# ignore keypresses, forwarding all of them to the inner session
bind -T root F12  \
  set prefix None \;\
  set key-table off \;\
  set status-style "fg=$color_status_text,bg=$color_window_off_status_bg" \;\
  set window-status-current-format "#[fg=$color_window_off_status_bg,bg=$color_window_off_status_current_bg]$separator_powerline_right#[default] #I:#W# #[fg=$color_window_off_status_current_bg,bg=$color_window_off_status_bg]$separator_powerline_right#[default]" \;\
  set window-status-current-style "fg=$color_dark,bold,bg=$color_window_off_status_current_bg" \;\
  if -F '#{pane_in_mode}' 'send-keys -X cancel' \;\
  refresh-client -S \;\

# F12 will turn back on the outer session too
bind -T off F12 \
  set -u prefix \;\
  set -u key-table \;\
  set -u status-style \;\
  set -u window-status-current-style \;\
  set -u window-status-current-format \;\
  refresh-client -S

wg_is_keys_off="#[fg=$color_light,bg=$color_window_off_indicator]#([ $(tmux show-option -qv key-table) = 'off' ] && echo 'OFF')#[default]"

set -g status-right "$wg_is_keys_off #{sysstat_cpu} | #{sysstat_mem} | #{sysstat_loadavg} | $wg_user_host"