tmux.conf

# Set prefix to Ctrl-Space instead of Ctrl-b
unbind C-b
set -g prefix C-a
bind a send-prefix

# See (and comments): https://stackoverflow.com/a/42461580/3943054
bind -n S-Enter send-keys Escape "[13;2u"
bind -n C-Enter send-keys Escape "[13;5u"

# split panes using | and _
bind | split-window -h
bind _ split-window -v
unbind '"'
unbind %

bind q killp

set-window-option -g mode-keys vi
bind-key -T copy-mode-vi v send -X begin-selection
bind-key -T copy-mode-vi V send -X select-line
bind-key -T copy-mode-vi y send -X copy-pipe-and-cancel 'xclip -in -selection clipboard'
# switch panes using Alt-arrow without prefix
bind -n M-h select-pane -L
bind -n M-l select-pane -R
bind -n M-k select-pane -U
bind -n M-j select-pane -D
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"

set -g mouse on

set-option -gw xterm-keys on
bind C-Tab next-window
bind C-S-Tab previous-window

# address vim mode switching delay (http://superuser.com/a/252717/65504)
set -s escape-time 0

# increase scrollback buffer size
set -g history-limit 50000

# tmux messages are displayed for 4 seconds
set -g display-time 2000

# upgrade $TERM
set -g default-terminal "screen-256color"

# focus events enabled for terminals that support them
set -g focus-events on

# super useful when using "grouped sessions" and multi-monitor setup
setw -g aggressive-resize on