setup.sh

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

# Function to print error message and exit
function error_exit {
  echo "$1" >&2
  exit 1
}

# Install Nix
# Official installation link: https://nixos.org/download/
if ! command -v nix >/dev/null 2>&1; then
  echo "Installing Nix..."
  sh <(curl -L https://nixos.org/nix/install) --daemon || error_exit "Failed to install Nix."
else
  echo "Nix is already installed."
fi

# Install Nix Home Manager
# Official installation link: https://nix-community.github.io/home-manager/index.xhtml#sec-install-standalone
echo "Setting up Nix Home Manager..."
nix-channel --add https://github.com/nix-community/home-manager/archive/master.tar.gz home-manager || error_exit "Failed to add home-manager channel."
nix-channel --update || error_exit "Failed to update nix channels."
nix-shell '<home-manager>' -A install || error_exit "Failed to install Home Manager."

# Enable experimental features in Nix
mkdir -p ~/.config/nix
if ! grep -q "experimental-features = nix-command flakes" ~/.config/nix/nix.conf 2>/dev/null; then
  echo "experimental-features = nix-command flakes" >> ~/.config/nix/nix.conf
  echo "Enabled Nix experimental features."
else
  echo "Nix experimental features already enabled."
fi

# Backup existing Neovim configuration
backup_dir=~/.config/nvim_backup
echo "Backing up existing Neovim configuration to $backup_dir..."
mkdir -p $backup_dir
for dir in ~/.config/nvim ~/.local/share/nvim ~/.local/state/nvim ~/.cache/nvim; do
  if [ -d "$dir" ]; then
    mv "$dir" "$backup_dir" || error_exit "Failed to move $dir to $backup_dir."
  fi
done

# Install Astronvim
echo "Installing Astronvim..."
git clone https://github.com/inmzhang/astronvim_config ~/.config/nvim || error_exit "Failed to clone Astronvim config."

# Set up Home Manager
echo "Setting up Home Manager..."
home-manager switch || error_exit "Failed to switch Home Manager configuration."

echo "Setup completed successfully."