modern osx tmux conf

.tmux.conf

# ~/.tmux.conf

# General settings
set -g default-terminal "screen-256color"  # Use 256-color terminal
set -g history-limit 5000  # Increase scrollback buffer size
set -g base-index 0  # Start window indexes at 0
set -g mouse on  # Enable mouse control (pane selection, resizing, scrolling)

# Restore original prefix key
set-option -g prefix C-b  # Set prefix to Ctrl-b
bind-key C-b send-prefix  # Send the prefix to client inside window

# Status bar
set -g status-interval 5  # Status bar update interval
set -g status-justify left  # Left-justify window list in status bar
setw -g window-status-format "#I:#W#F"  # Window list format
setw -g window-status-current-format "#[bold]#I:#W#F"  # Active window format

# Appearance
setw -g mode-keys vi  # Use vi-style keybindings in copy mode
set -g status-keys vi  # Use vi-style keybindings in status line

# Mouse support in copy mode
setw -g mouse on  # Enable mouse in copy mode and pane resizing, selection

# Splits and windows
bind-key | split-window -h  # Horizontal split
bind-key - split-window -v  # Vertical split
bind-key c new-window  # Create new window
bind-key n next-window  # Move to the next window
bind-key p previous-window  # Move to the previous window

# Copy and paste
bind-key -T copy-mode-vi 'v' send -X begin-selection  # Begin selection in copy mode
bind-key -T copy-mode-vi 'y' send -X copy-selection-and-cancel  # Yank selection and exit copy mode
bind-key -T prefix ] paste-buffer  # Paste buffer

# Navigation using arrow keys for panes and windows
bind-key -n "C-Left"  select-window -t :-  # Ctrl-Left to select previous window
bind-key -n "C-Right" select-window -t :+  # Ctrl-Right to select next window
bind-key -n "C-Up"    select-pane -U  # Ctrl-Up to select the pane above
bind-key -n "C-Down"  select-pane -D  # Ctrl-Down to select the pane below

# Resizing panes
bind-key -r H resize-pane -L 5  # Resize pane left
bind-key -r J resize-pane -D 5  # Resize pane down
bind-key -r K resize-pane -U 5  # Resize pane up
bind-key -r L resize-pane -R 5  # Resize pane right

# Detach, reload, and other bindings
bind-key d detach  # Detach session
bind-key R source-file ~/.tmux.conf \; display-message "Config reloaded!"  # Reload tmux config
bind-key x confirm-before "kill-pane"  # Kill current pane
bind-key X confirm-before "kill-window"  # Kill current window

# Default statusbar colors
set -g status-style fg=white,bg=default
setw -g window-status-style fg=white,bg=default,dim
setw -g window-status-current-style fg=cyan,bg=default,underscore

# Automatically adjust window size when pane is added or closed
setw -g aggressive-resize on