setup-rust-cli.sh

```bash
#!/usr/bin/env bash
set -e

echo "🚀 Setting up Rust-based CLI tools on macOS..."

# --- Helper functions --------------------------------------------------------

append_if_missing() {
  local FILE="$1"
  local LINE="$2"

  touch "$FILE"
  if ! grep -Fq "$LINE" "$FILE"; then
    echo "$LINE" >> "$FILE"
    echo "  ➕ Added to $FILE: $LINE"
  else
    echo "  ✔ Already in $FILE: $LINE"
  fi
}

# --- Check Homebrew ----------------------------------------------------------

if ! command -v brew >/dev/null 2>&1; then
  echo "❌ Homebrew is not installed."
  echo "👉 Install with: /bin/bash -c \"\$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/HEAD/install.sh)\""
  exit 1
fi

echo "✅ Homebrew found."

# --- Install tools -----------------------------------------------------------

TOOLS=(
  ripgrep
  fd
  eza
  bat
  zoxide
  nushell
  alacritty
  zellij
  starship
  dust
  procs
  hyperfine
  bottom
)

echo "📦 Installing CLI tools via Homebrew..."
brew install "${TOOLS[@]}"

echo "✅ Tools installed."

# --- Zsh configuration -------------------------------------------------------

ZSHRC="${HOME}/.zshrc"
mkdir -p "${HOME}/.config"

echo "📝 Updating ${ZSHRC} ..."

# Aliases
append_if_missing "$ZSHRC" 'alias ls="eza --git --icons --group-directories-first"'
append_if_missing "$ZSHRC" 'alias ll="eza -lah --git --icons --group-directories-first"'
append_if_missing "$ZSHRC" 'alias la="eza -la --git --icons --group-directories-first"'
append_if_missing "$ZSHRC" 'alias cat="bat"'
append_if_missing "$ZSHRC" 'alias f="fd"'
append_if_missing "$ZSHRC" 'alias rg="rg --hidden --glob \x27!.git\x27"'

# zoxide init
append_if_missing "$ZSHRC" 'eval "$(zoxide init zsh)"'

# starship init
append_if_missing "$ZSHRC" 'eval "$(starship init zsh)"'

echo "✅ Zsh aliases & init blocks configured."

# --- starship basic config ---------------------------------------------------

STARSHIP_CONFIG_DIR="${HOME}/.config"
STARSHIP_CONFIG_FILE="${STARSHIP_CONFIG_DIR}/starship.toml"

if [ ! -f "$STARSHIP_CONFIG_FILE" ]; then
  echo "🛠  Creating basic starship config at ${STARSHIP_CONFIG_FILE} ..."
  cat > "$STARSHIP_CONFIG_FILE" << 'EOF'
add_newline = true

[character]
success_symbol = "[➜](bold)"
error_symbol = "[✗](bold)"

[directory]
truncation_length = 3

[git_status]
conflicted = "⚔️ "
ahead = "⇡"
behind = "⇣"
staged = "+ "
modified = "~ "
untracked = "? "
EOF
  echo "✅ starship config created."
else
  echo "ℹ️  starship config already exists at ${STARSHIP_CONFIG_FILE}, leaving it untouched."
fi

echo ""
echo "🎉 Done!"
echo "👉 Bitte ein neues Terminal öffnen oder ausführen:"
echo "   source \"$ZSHRC\""
echo ""
echo "Viel Spass mit deinem neuen Rust-CLI-Setup, Tom 🦀🔥"
```