TMUX Setup

setup-tmux.sh

#!/usr/bin/env bash
set -euo pipefail

TMUX_CONF="$HOME/.tmux.conf"
BACKUP="$HOME/.tmux.conf.backup.$(date +%Y%m%d-%H%M%S)"

echo "Setting up custom tmux config..."

if [ -f "$TMUX_CONF" ]; then
  echo "Existing ~/.tmux.conf found. Creating backup:"
  echo "$BACKUP"
  cp "$TMUX_CONF" "$BACKUP"
fi

cat > "$TMUX_CONF" <<'EOF'
# Prefix: Ctrl+a instead of Ctrl+b
unbind C-b
set -g prefix C-a
bind C-a send-prefix

# Better pane splitting
bind | split-window -h
bind - split-window -v
unbind '"'
unbind %

# Vim-like pane movement
bind h select-pane -L
bind j select-pane -D
bind k select-pane -U
bind l select-pane -R

# Resize panes with capital H/J/K/L
bind H resize-pane -L 5
bind J resize-pane -D 5
bind K resize-pane -U 5
bind L resize-pane -R 5

# Mouse support
set -g mouse on

# Start windows and panes at 1
set -g base-index 1
setw -g pane-base-index 1

# Better colors
set -g default-terminal "tmux-256color"
set -ga terminal-overrides ",xterm-256color:RGB"

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

# Status bar
set -g status-position bottom
set -g status-interval 5
set -g status-left-length 40
set -g status-right-length 80

# History
set -g history-limit 50000

# Renumber windows after closing one
set -g renumber-windows on

# Escape delay: makes Vim/Neovim feel faster
set -sg escape-time 10
EOF

echo "tmux config written to $TMUX_CONF"

if command -v tmux >/dev/null 2>&1; then
  if tmux has-session 2>/dev/null; then
    tmux source-file "$TMUX_CONF"
    echo "Reloaded config in current tmux server."
  else
    echo "No active tmux session found."
  fi
else
  echo "tmux is not installed. Install it with:"
  echo "brew install tmux"
fi

echo "Done."
echo ""
echo "Main shortcuts:"
echo "  Ctrl+a then |    split vertical"
echo "  Ctrl+a then -    split horizontal"
echo "  Ctrl+a then h/j/k/l move panes"
echo "  Ctrl+a then H/J/K/L resize panes"
echo "  Ctrl+a then c    new window"
echo "  Ctrl+a then d    detach"
echo "  Ctrl+a then r    reload config"