Personal customized tmux configuration

.tmux.conf

# Customize configuration
set -g mouse on

# Use VIM navigation style
set -g mode-keys vi

# Status update interval
set -g status-interval 1

# Enable 24bit true color
set -g default-terminal "xterm-256color"
set-option -ga terminal-overrides ",xterm-256color:Tc"

# remap prefix from 'C-b' to 'C-a'
unbind C-b
set-option -g prefix C-a
bind-key C-a send-prefix

# Start window numbering at 1
set -g base-index 1
# Start pane number at 1
setw -g pane-base-index 1
set -g display-panes-time 2000

# Remap split shortcut
bind | split-window -h
bind - split-window -v

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

# Load theme configuration
source-file ~/.tmux.theme.conf

# List of plugins
set -g @plugin 'tmux-plugins/tpm'
set -g @plugin 'tmux-plugins/tmux-sensible'
set -g @plugin 'tmux-plugins/tmux-resurrect'
set -g @plugin 'tmux-plugins/tmux-yank'
set -g @plugin 'nhdaly/tmux-better-mouse-mode'
set -g @plugin 'tmux-plugins/tmux-prefix-highlight'

# Initialize TMUX plugin manager (keep this line at the very bottom of tmux.conf)
run -b '~/.tmux/plugins/tpm/tpm'

.tmux.theme.conf

### Customize status bar

# Prefix highlight
set -g @prefix_highlight_fg white
set -g @prefix_highlight_bg colour233
set -g @prefix_highlight_prefix_prompt 'Wait'
set -g @prefix_highlight_copy_prompt 'Copy'

# Basic status bar colors
set -g status-style fg=colour240,bg=colour233

# Left side of status bar
set -g status-left-style fg=colour243,bg=colour233
set -g status-left-length 40
set -g status-left "#[fg=colour233,bg=colour24,bold] #S #[fg=colour24,bg=colour240,nobold]#[fg=colour233,bg=colour240] #(whoami) #[fg=colour240,bg=colour235]#[fg=colour240,bg=colour235] #I:#P #[fg=colour235,bg=colour233,nobold]"

# Right side of status bar
set -g status-right-style fg=colour243,bg=colour233
set -g status-right-length 150
set -g status-right "#[fg=colour233,bg=colour233]#{prefix_highlight} #[fg=colour235,bg=colour233]#[fg=colour38,bg=colour235 bold] %H:%M:%S #[fg=colour240,bg=colour235]#[fg=colour233,bg=colour240] %d-%b-%y #[fg=colour24,bg=colour240]#[fg=colour250,bg=colour24,bold] #(hostname | cut -d . -f 1) "

# Window status
set -g window-status-format "  #I:#W#F  "
set -g window-status-current-format "#[fg=colour233,bg=black]#[fg=colour38,bold] #I:#W#F #[fg=colour233,bg=black,nobold]"

# Current window status
set -g window-status-current-style fg=colour235,bg=colour24

# Window with activity status
# set -g window-status-activity-bg colour245 # fg and bg are flipped here due to
# set -g window-status-activity-fg colour233 # a bug in tmux

# Window separator
set -g window-status-separator ""

# Window status alignment
set -g status-justify left

# Pane border
set -g pane-border-style fg=colour24,bg=default

# Active pane border
set -g pane-active-border-style fg=colour24,bg=default

# Pane number indicator
# set -g display-panes-colour colour233
set -g display-panes-active-colour colour24

# Clock mode
set -g clock-mode-colour colour24
set -g clock-mode-style 24

# Message
set -g message-style fg=white,bg=colour24

# Command message
set -g message-command-style fg=white,bg=colour233

# Mode
set -g mode-style fg=white,bg=colour24

Here's the link of TPM

git clone https://github.com/tmux-plugins/tpm ~/.tmux/plugins/tpm

Upgrade to tmux 2.9.x style syntax