Table of contents:
set-option -g renumber-windows on
bind-key -n M-k confirm-before -p "kill-window #W? (y/n)" kill-window
bind-key -n M-z resize-pane -Z
bind -n M-m run "\
tmux show-options -g | grep -q "mouse\\s*on"; \
if [ \$? = 0 ]; \
then \
toggle=off; \
else \
toggle=on; \
fi; \
tmux display-message \"mouse is now: \$toggle\"; \
tmux set-option -w mouse \$toggle; \
tmux set-option -g mouse \$toggle; \
"