tmux in vim mode

.tmux.conf

# use C-a, since it's on the home row and easier to hit than C-b
set-option -g prefix C-a
unbind-key C-a
bind-key C-a send-prefix
set -g base-index 1

# vi is good
set-window-option -g mode-keys vi


bind-key -T copy-mode-vi 'v' send -X begin-selection
bind-key -T copy-mode-vi 'y' send -X copy-selection-and-cancel

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"

# mouse behavior
setw -g mouse on

# Set window notifications
setw -g monitor-activity on
set -g visual-activity on