My tmux config, heavy influenced by https://github.com/simonsmith/dotfiles

.tmux.conf

# tmux prefix
unbind C-b
set -g prefix C-a
# set -g default-terminal "xterm-256color"
set -g default-terminal "screen-256color"
set -ga terminal-overrides ",xterm-256color:Tc"

# Enable true color - tmux 2.2+
# https://deductivelabs.com/en/2016/03/using-true-color-vim-tmux/
# set-option -ga terminal-overrides ",xterm-256color:Tc"

# 0 is too far
set -g base-index 1
setw -g pane-base-index 1

setw -g mouse on
setw -g monitor-activity off
setw -g mode-keys vi

# Set vim style copy paste
bind-key -T copy-mode-vi 'v' send-keys -X begin-selection
bind-key -T copy-mode-vi 'V' send-keys -X select-line
bind-key -T copy-mode-vi 'r' send-keys -X rectangle-toggle

# = = = = = = = =
# disable "release mouse drag to copy and exit copy-mode", ref: https://github.com/tmux/tmux/issues/140
set -g @yank_with_mouse off # or 'on'

unbind-key -T copy-mode-vi MouseDragEnd1Pane

# since MouseDragEnd1Pane neither exit copy-mode nor clear selection now,
# let single click do selection clearing for us.
bind-key -T copy-mode-vi MouseDown1Pane select-pane\; send-keys -X clear-selection

# this line changes the default binding of MouseDrag1Pane, the only difference
# is that we use `copy-mode -eM` instead of `copy-mode -M`, so that WheelDownPane
# can trigger copy-mode to exit when copy-mode is entered by MouseDrag1Pane
bind -n MouseDrag1Pane if -Ft= '#{mouse_any_flag}' 'if -Ft= \"#{pane_in_mode}\" \"copy-mode -eM\" \"send-keys -M\"' 'copy-mode -eM'
# = = = = = = = =

# resize panes
bind -r H resize-pane -L 5
bind -r J resize-pane -D 5
bind -r K resize-pane -U 5
bind -r L resize-pane -R 5

# create window and panes
bind c new-window -c "#{pane_current_path}"
bind | split-window -h -c "#{pane_current_path}"
bind - split-window -v -c "#{pane_current_path}"

# Restore clear screen
bind C-l send-keys 'C-l'
# ctrl+] => cmd+k (iTerm, send keys: cmd+k => 0x1d)
bind -n C-] send-keys -R \; send-keys C-l \; clear-history

# status
set -g @prefix_highlight_show_copy_mode 'on'
set -g @prefix_highlight_copy_mode_attr 'fg=colour231,bg=colour04' # default is 'fg=default,bg=yellow'

# Plugins
set -g @plugin 'tmux-plugins/tpm'
set -g @plugin 'tmux-plugins/tmux-sensible'
set -g @plugin 'tmux-plugins/tmux-prefix-highlight'
set -g @plugin 'tmux-plugins/tmux-copycat'
set -g @plugin 'tmux-plugins/tmux-yank'
set -g @plugin 'tmux-plugins/tmux-open'
set -g @plugin 'christoomey/vim-tmux-navigator'

# Theme
source ~/.tmuxline_snapshot

run -b '~/.tmux/plugins/tpm/tpm'

.tmuxline_snapshot

set -g status-justify "left"
set -g status "on"
set -g status-right-length "160"
set -g status-right-style "none"
set -g message-style fg=colour2
set -g message-style bg=colour0
set -g status-style "none"
set -g status-style bg=default
set -g pane-border-style bg=default
set -g pane-border-style fg=colour240
set -g pane-active-border-style bg=default
set -g pane-active-border-style fg=colour245
set -g status-left-length "100"
set -g status-left-style "none"
setw -g window-status-style bg=default
setw -g window-status-style fg=colour242
setw -g window-status-style "none"
setw -g window-status-activity-style "none"
setw -g window-status-activity-style fg=colour2
setw -g window-status-separator ""
set -g status-left "#[fg=colour231] #S #[fg=colour2,nobold,nounderscore,noitalics]"
set -g status-right "#{prefix_highlight} #[fg=colour0,nobold,nounderscore,noitalics] #[fg=colour242] #(spotify) #(ipconfig getifaddr en0) | #(battery -a -p -t) #[fg=colour242]| %R - %d-%m-%Y"
setw -g window-status-format "#[fg=colour0,nobold,nounderscore,noitalics] #[fg=colour242] #W #[fg=colour0,nobold,nounderscore,noitalics]"
setw -g window-status-current-format "#[fg=colour0,nobold,nounderscore,noitalics] #[fg=colour04] #W #[fg=colour0,nobold,nounderscore,noitalics]"
setw -g window-status-current-style "bright"
setw -g window-status-current-style bg=default

battery

#!/bin/bash

usage() {
cat <<EOF
battery: usage:

  general:
    -h, --help    print this message
    -p            use pmset (more accurate)
    -t            output tmux status bar format
    -a            output ascii bar instead of spark's
    -b            battery path            default: /sys/class/power_supply/BAT0
  colors:
    -g <color>    good battery level      default: green or 1;32
    -m <color>    middle battery level    default: yellow or 1;33
    -w <color>    warn battery level      default: red or 0;31
EOF
}

if [[ $1 == '-h' || $1 == '--help' || $1 == '-?' ]]; then
  usage
  exit 0
fi

# For default behavior
setDefaults() {
  pmset_on=0
  output_tmux=0
  ascii=0
  ascii_bar='=========='
  good_color="1;32"
  middle_color="1;33"
  warn_color="0;31"
  connected=0
  battery_path=/sys/class/power_supply/BAT0
}

setDefaults

battery_charge() {
    case $(uname -s) in
        "Darwin")
            if ((pmset_on)) && hash pmset 2>/dev/null; then
                if [ "$(pmset -g batt | grep -o 'AC Power')" ]; then
                    BATT_CONNECTED=1
                else
                    BATT_CONNECTED=0
                fi
                BATT_PCT=$(pmset -g batt | grep -o '[0-9]*%' | tr -d %)
            else
                while read key value; do
                    case $key in
                        "MaxCapacity")
                            maxcap=$value;;
                        "CurrentCapacity")
                            curcap=$value;;
                        "ExternalConnected")
                            if [ $value == "No" ]; then
                                BATT_CONNECTED=0
                            else
                                BATT_CONNECTED=1
                            fi
                        ;;
                        esac
                    if [[ -n "$maxcap" && -n $curcap ]]; then
                        BATT_PCT=$(( 100 * curcap / maxcap))
                    fi
                done < <(ioreg -n AppleSmartBattery -r | grep -o '"[^"]*" = [^ ]*' | sed -e 's/= //g' -e 's/"//g' | sort)
            fi
            ;;
        "Linux")
			battery_state=$(cat $battery_path/status)
			battery_full=$battery_path/charge_full
			battery_current=$battery_path/charge_now
            if [ $battery_state == 'Discharging' ]; then
                BATT_CONNECTED=0
            else
                BATT_CONNECTED=1
            fi
			now=$(cat $battery_current)
			full=$(cat $battery_full)
			BATT_PCT=$((100 * $now / $full))
            ;;
    esac
}


# Apply the correct color to the battery status prompt
apply_colors() {
if [[ $BATT_PCT -ge 95 ]]; then
  if ((output_tmux)); then
    COLOR="#[fg=$good_color]Batt: "
  else
    COLOR=$good_color
  fi

# Green
elif [[ $BATT_PCT -ge 75 ]]; then
  if ((output_tmux)); then
    COLOR="#[fg=$good_color]Batt: "
  else
    COLOR=$good_color
  fi

# Yellow
elif [[ $BATT_PCT -ge 20 ]] && [[ $BATT_PCT -lt 75 ]]; then
  if ((output_tmux)); then
    COLOR="#[fg=$middle_color]Batt: "
  else
    COLOR=$middle_color
  fi

# Red
elif [[ $BATT_PCT -lt 20 ]]; then
  if ((output_tmux)); then
    COLOR="#[fg=$warn_color]Batt: "
  else
    COLOR=$warn_color
  fi
fi
}

print_status() {
# Print the battery status
    if ((BATT_CONNECTED)); then
        GRAPH=""
    else
        if hash spark 2>/dev/null; then
			sparks=$(spark 0 ${BATT_PCT} 100)
			GRAPH=${sparks:1:1}
        else
            ascii=1
        fi
    fi

    if ((ascii)); then
        barlength=${#ascii_bar}

        # Divides BATTTERY_STATUS by 10 to get a decimal number; i.e 7.6
        n=$(echo "scale = 1; $BATT_PCT / 10" | bc)

        # Round the number to the nearest whole number
        rounded_n=$(printf "%.0f" "$n")

        # Creates the bar
        GRAPH=$(printf "[%-${barlength}s]" "${ascii_bar:0:rounded_n}")
    fi


if ((output_tmux)); then
  printf "%s" "$COLOR" "$BATT_PCT%"
else
  printf "\e[0;%sm%s %s \e[m\n"  "$COLOR" "[$BATT_PCT%]"  "$GRAPH"
fi

}

# Read args
while getopts ":g:m:w:tab:p" opt; do
  case $opt in
    g)
      good_color=$OPTARG
      ;;
    m)
      middle_color=$OPTARG
      ;;
    w)
      warn_color=$OPTARG
      ;;
    t)
      output_tmux=1
      good_color="green"
      middle_color="yellow"
      warn_color="red"
      ;;
    a)
      ascii=1
      ;;
    p)
      pmset_on=1
      ;;
    b)
	  if [ -d $OPTARG ]; then
		battery_path=$OPTARG
	  else
		>&2 echo "Battery not found, trying to use default path..."
	    if [ ! -d $battery_path ]; then
		  >&2 echo "Default battery path is also unreachable"
		  exit 1
		fi
	  fi
      ;;
    \?)
      echo "Invalid option: -$OPTARG"
      exit 1
      ;;
    :)
      echo "Option -$OPTARG requires an argument"
      exit 1
      ;;
  esac
done

battery_charge
apply_colors
print_status

spotify

music=$(osascript ~/applescript/spotify.scpt)

if [[ $music ]]; then
  echo "$music |"
fi;

spotify.scpt

if application "Spotify" is running then
  tell application "Spotify"
    set theName to name of the current track
    set theArtist to artist of the current track
    set theAlbum to album of the current track
    set theUrl to spotify url of the current track

    set playerState to player state
    if playerState is playing then
      set playIcon to "Playing:"
    end if
    if playerState is paused then
      set playIcon to "Paused:"
    end if

    try
      return playIcon & " " & theName & " by " & theArtist
    on error err
    end try
  end tell
end if