.tmux.conf

set -sg escape-time 0
set-option -g default-terminal "screen-256color"
set -g default-shell $SHELL
set-option -g default-command "reattach-to-user-namespace -l ${SHELL}"

is_vim="ps -o state= -o comm= -t '#{pane_tty}' \
    | grep -iqE '^[^TXZ ]+ +(\\S+\\/)?g?(view|n?vim?x?)(diff)?$'"
bind-key -n C-h if-shell "$is_vim" "send-keys C-h"  "select-pane -L"
bind-key -n C-j if-shell "$is_vim" "send-keys C-j"  "select-pane -D"
bind-key -n C-k if-shell "$is_vim" "send-keys C-k"  "select-pane -U"
bind-key -n C-l if-shell "$is_vim" "send-keys C-l"  "select-pane -R"
bind-key -n C-\ if-shell "$is_vim" "send-keys C-\\" "select-pane -l"

bind C-l send-keys 'C-l'
setw -g mode-keys vi
set -g status-keys vi
bind-key -t vi-edit Up   history-up
bind-key -t vi-edit Down history-down