my .tmux.conf file along with the scripts I use for the status bar. I am using the following theme https://github.com/chriskempson/tomorrow-theme with the inconsolata-dz patched font https://github.com/Lokaltog/powerline-fonts

.tmux.conf

unbind C-b
set -g prefix C-o
bind v send-prefix

#setting utf8 encoding
  set -g utf8
  set-window-option -g utf8 on

#default settings
  set -g default-terminal "screen-256color"
  set-option -g default-shell $SHELL
  set-option -g default-command "reattach-to-user-namespace -l zsh"

#monitor any activity that happens in other windows and screens
  setw -g monitor-activity on
  set -g visual-activity on

#set window and pane index to 1
  set -g base-index 1
  set -g pane-base-index 1

#aggressive resize
  setw -g aggressive-resize on

#clear screen
  bind C-l send-keys 'C-l'

#use PREFIX | and - to split windows
  bind | split-window -h -c "#{pane_current_path}"
  bind - split-window -v -c "#{pane_current_path}"

#window options
  set-option -g allow-rename off
  set-option -g renumber-windows on

#enabling mouse specific features
  set -g mouse-select-pane on
  set -g mouse-resize-pane on
  set -g mouse-select-window on

#swap windows with its neighbor
  bind-key H swap-window -t -1
  bind-key L swap-window -t +1

#reload config file
  bind-key r source-file ~/.tmux.conf\;\
  display "Config Reloaded."

#clear the screen
  bind-key C-k clear-history \;\
  display "Screen Cleared"

#set simple status bar
  bind-key s \
    set -g status-left-length 0\;\
    set -g status-justify left \;\
    display "Simple Status Bar Enabled"

#set full status bar
  bind-key S \
    set -g status-left-length 70\;\
    set -g status-justify centre\;\
    display "Full Status Bar Enabled"

#run a command in the command prompt
  bind-key e \
    command-prompt "run -b 'cd #{pane_current_path} && %1'"

#quick to-do list
  bind-key T clock-mode
  bind-key t \
    command-prompt -p "Todo:" "run -b 'echo %1 >> ~/Documents/txtFiles/todo.txt'"

#swap ; and :
    bind-key \; command-prompt
    bind-key : last-pane

#use vim keybinding in copy mode
  setw -g mode-keys vi

  bind-key -t vi-copy v begin-selection
  bind-key -t vi-copy y copy-pipe "reattach-to-user-namespace pbcopy"

#update default binding of `Enter` to also use copy-pipe
  unbind -t vi-copy Enter
  bind-key -t vi-copy Enter copy-pipe "reattach-to-user-namespace pbcopy"

#Clock options
  set-window-option -g clock-mode-colour green
  set-window-option -g clock-mode-style 24

#status bar options
  set-option -g status on         #enable status bar
  set -g status-utf8 on           #enable utf-8 for status bar
  set -g status-interval 10       #set update frequency
  set -g status-justify centre    #position windows in the middle

#color stuff

#pane colors
  set-option -g pane-border-fg colour246
  set-option -g pane-active-border-fg colour4

#setting color for status bar
  set-option -g status-bg colour234
  set-option -g status-fg colour4
  set-option -g status-attr dim

#setting window list colors
  set-window-option -g window-status-fg colour4
  set-window-option -g window-status-bg colour235
  set-window-option -g window-status-attr dim

  set-window-option -g window-status-current-fg colour1
  set-window-option -g window-status-current-bg colour235
  set-window-option -g window-status-current-attr bright

#setting the right status bar
  set -g status-left-length 70
  set -g status-left "#[fg=colour234,bg=colour2] #S:#I.#P #[fg=colour2, bg=colour4] #[fg=colour234]cpu: #(sh ~/.bin/getCPU.sh)%% #[fg=colour4, bg=colour5] #[fg=colour234]mem: #(sh ~/.bin/getMem.sh)%% #[fg=colour5,bg=colour6] #[fg=colour234]bat: #(sh ~/.bin/getBatt.sh) #[fg=colour6,bg=colour234]#[fg=colour234]"
  #set -g status-left "#(node ~/Documents/Programming/projects/muxly/muxly.js left) here"
  set -g status-right-length 60
  set -g status-right "#[fg=colour3,bg=colour234]#[fg=colour234,bg=colour3]%d %b %Y - %H:%M %p "

#setting status bar message options
  set -g message-bg colour238
  set -g message-fg colour6
  set -g message-command-bg colour238
  set -g message-command-fg colour6
  set -g display-time 1500

#setting options for when an alert happens
  set -g window-status-bell-bg colour240
  set -g window-status-content-bg colour240
  set -g window-status-activity-bg colour240

#setting options to move between panes with vim keys
  bind-key k select-pane -U
  bind-key j select-pane -D
  bind-key h select-pane -L
  bind-key l select-pane -R

#tmux/vim magic
bind -n C-h run "(tmux display-message -p '#{pane_current_command}' | grep -iqE '(^|\/)vim(diff)?$' && tmux send-keys C-h) || tmux select-pane -L"
bind -n C-j run "(tmux display-message -p '#{pane_current_command}' | grep -iqE '(^|\/)vim(diff)?$' && tmux send-keys C-j) || tmux select-pane -D"
bind -n C-k run "(tmux display-message -p '#{pane_current_command}' | grep -iqE '(^|\/)vim(diff)?$' && tmux send-keys C-k) || tmux select-pane -U"
bind -n C-l run "(tmux display-message -p '#{pane_current_command}' | grep -iqE '(^|\/)vim(diff)?$' && tmux send-keys C-l) || tmux select-pane -R"
bind -n C-\ run "(tmux display-message -p '#{pane_current_command}' | grep -iqE '(^|\/)vim(diff)?$' && tmux send-keys 'C-\\') || tmux select-pane -l"

currentTrack.sh

#!/bin/sh

state=`osascript -e 'tell application "iTunes" to player state as string'`;

if [ $state = 'playing' ]; then
    artist=`osascript -e 'tell application "iTunes" to artist of current track as string'`;
    track=`osascript -e 'tell application "iTunes" to name of current track as string'`;
    echo "#[fg=colour1]#[fg=colour234,bg=colour1] $artist: $track #[fg=colour3,bg=colour1]";
else
    echo "#[fg=colour3,bg=colour234]"
fi

getBatt.sh

#! /bin/bash
pmset -g batt | egrep "([0-9]+\%).*" -o | cut -f1 -d';'

getCPU.sh

#!bin/sh
ps aux | awk {'sum+=$3;print sum'} | tail -n 1

getMem.sh

#!bin.sh
ps aux | awk {'sum+=$4;print sum'} | tail -n 1