my customized tmux configuration

.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

# Easy config reload
bind-key R source-file ~/.tmux.conf \; display-message "tmux.conf reloaded."

# vi is good
setw -g mode-keys vi

# mouse behavior
set -g mouse on

set-option -g default-terminal screen-256color

bind-key : command-prompt
bind-key r refresh-client
bind-key L clear-history

bind-key space next-window
bind-key bspace previous-window
bind-key enter next-layout

# use vim-like keys for splits and windows
bind-key v split-window -h -c "#{pane_current_path}"
bind-key s split-window -v -c "#{pane_current_path}"
bind-key h select-pane -L
bind-key j select-pane -D
bind-key k select-pane -U
bind-key l select-pane -R

# uncomment below stanza to enable smart pane switching with awareness of vim splits
# bind -n C-h run "(tmux display-message -p '#{pane_current_command}' | grep -iqE '(^|\/)vim$' && tmux send-keys C-h) || tmux select-pane -L"
# bind -n C-j run "(tmux display-message -p '#{pane_current_command}' | grep -iqE '(^|\/)vim$' && tmux send-keys C-j) || tmux select-pane -D"
# bind -n C-k run "(tmux display-message -p '#{pane_current_command}' | grep -iqE '(^|\/)vim$' && tmux send-keys C-k) || tmux select-pane -U"
# bind -n C-l run "(tmux display-message -p '#{pane_current_command}' | grep -iqE '(^|\/)vim$' && tmux send-keys C-l) || tmux select-pane -R"
# bind -n C-\ run "(tmux display-message -p '#{pane_current_command}' | grep -iqE '(^|\/)vim$' && tmux send-keys 'C-\\') || tmux select-pane -l"
# bind C-l send-keys 'C-l'

bind-key C-o rotate-window

bind-key + select-layout main-horizontal
bind-key = select-layout main-vertical
set-window-option -g other-pane-height 25
set-window-option -g other-pane-width 80

bind-key a last-pane
bind-key q display-panes
bind-key c new-window
bind-key t next-window
bind-key T previous-window

bind-key [ copy-mode
bind-key ] paste-buffer

run-shell "tmux setenv -g TMUX_VERSION $(tmux -V | cut -c 6-)"

# Setup 'v' to begin selection as in Vim
# Update default binding of `Enter` to also use copy-pipe
#
# New keybindings for vi-mode when version >= 2.4
# https://github.com/tmux/tmux/issues/754
if-shell -b '[ "$(echo "$TMUX_VERSION >= 2.4" | bc)" = 1 ]' \
  'bind-key -T copy-mode-vi v send-keys -X begin-selection ; \
  bind-key -T copy-mode-vi y send-keys -X copy-pipe-and-cancel "reattach-to-user-namespace pbcopy" ; \
  unbind -T copy-mode-vi Enter ; \
  bind-key -T copy-mode-vi Enter send-keys -X copy-pipe-and-cancel "reattach-to-user-namespace pbcopy"; ' \
  'bind-key -t vi-copy v begin-selection ; \
  bind-key -t vi-copy y copy-pipe "reattach-to-user-namespace pbcopy" ; \
  unbind -t vi-copy Enter ; \
  bind-key -t vi-copy Enter copy-pipe "reattach-to-user-namespace pbcopy"; '

set-window-option -g display-panes-time 1500

# Status Bar
set-option -g status-interval 1
set-option -g status-left ''
set-option -g status-right '%l:%M%p'
set-window-option -g window-status-current-style fg=magenta
set-option -g status-style fg=default

# Status Bar solarized-dark (default)
set-option -g status-style bg=black
set-option -g pane-active-border-style fg=black
set-option -g pane-border-style fg=black

# Status Bar solarized-light
if-shell "[ \"$COLORFGBG\" = \"11;15\" ]" "set-option -g status-style bg=white"
if-shell "[ \"$COLORFGBG\" = \"11;15\" ]" "set-option -g pane-active-border-style fg=white"
if-shell "[ \"$COLORFGBG\" = \"11;15\" ]" "set-option -g pane-border-style fg=white"

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

# Enable native Mac OS X copy/paste
set-option -g default-command "/bin/bash -c 'which reattach-to-user-namespace >/dev/null && exec reattach-to-user-namespace $SHELL -l || exec $SHELL -l'"

# Allow the arrow key to be used immediately after changing windows
set-option -g repeat-time 0

# Fix to allow mousewheel/trackpad scrolling in tmux 2.1
bind-key -T root WheelUpPane if-shell -F -t = "#{alternate_on}" "send-keys -M" "select-pane -t =; copy-mode -e; send-keys -M"
bind-key -T root WheelDownPane if-shell -F -t = "#{alternate_on}" "send-keys -M" "select-pane -t =; send-keys -M"

# Disable assume-paste-time, so that iTerm2's "Send Hex Codes" feature works
# with tmux 2.1. This is backwards-compatible with earlier versions of tmux,
# AFAICT.
set-option -g assume-paste-time 0

source-file ~/.tmux.conf.local

# switch panes using Alt-arrow without prefix
bind -n M-Left select-pane -L
bind -n M-Right select-pane -R
bind -n M-Up select-pane -U
bind -n M-Down select-pane -D


######################
### DESIGN CHANGES ###
######################

# loud or quiet?
set -g visual-activity off
set -g visual-bell off
set -g visual-silence off
setw -g monitor-activity off
set -g bell-action none

#  modes
setw -g clock-mode-colour colour5
setw -g mode-style 'fg=colour1 bg=colour18 bold'

# panes
set -g pane-border-style 'fg=colour19 bg=colour0'
set -g pane-active-border-style 'bg=colour0 fg=colour9'

# statusbar
set -g status-position bottom
set -g status-justify left
set -g status-style 'bg=colour18 fg=colour137 dim'
set -g status-left ''
set -g status-right '#[fg=colour233,bg=colour19] %d/%m #[fg=colour233,bg=colour8] %H:%M:%S '
set -g status-right-length 50
set -g status-left-length 20

setw -g window-status-current-style 'fg=colour1 bg=colour19 bold'
setw -g window-status-current-format ' #I#[fg=colour249]:#[fg=colour255]#W#[fg=colour249]#F '

setw -g window-status-style 'fg=colour9 bg=colour18'
setw -g window-status-format ' #I#[fg=colour237]:#[fg=colour250]#W#[fg=colour244]#F '

setw -g window-status-bell-style 'fg=colour255 bg=colour1 bold'

# messages
set -g message-style 'fg=colour232 bg=colour16 bold'