install.sh

#!/usr/bin/env bash
#
# Idempotent installer for the framework-free zsh setup.
#
# Defaults to a dry run — prints what it would do without touching $HOME.
# Pass --apply to actually symlink files and back up anything in the way.
#
#   ./install.sh          # dry run (default)
#   ./install.sh --apply  # do it for real
#
set -euo pipefail

DOTFILES_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
BACKUP_DIR="$HOME/.dotfiles-backup/$(date +%Y%m%d%H%M%S)"

APPLY=0
for arg in "$@"; do
  case "$arg" in
    --apply) APPLY=1 ;;
    --dry-run) APPLY=0 ;;
    *)
      echo "Unknown argument: $arg" >&2
      echo "Usage: $0 [--apply|--dry-run]" >&2
      exit 1
      ;;
  esac
done

if [[ "$APPLY" -eq 0 ]]; then
  echo "-- DRY RUN -- no files will be changed. Re-run with --apply to install."
fi

# name -> source path (relative to $DOTFILES_DIR), symlinked to ~/name
LINKS=(
  ".zshrc:.zshrc"
  ".zsh_plugins.txt:.zsh_plugins.txt"
  ".config/starship.toml:starship.toml"
  ".zalias:zsh/.zalias"
  ".zexports:zsh/.zexports"
  ".zfunc:zsh/.zfunc"
  ".p10k.zsh:p10"
  "Library/Application Support/iTerm2/DynamicProfiles/dotfiles.json:iterm2/DynamicProfiles.json"
  "Library/Fonts/Meslo LG L DZ Regular for Powerline.otf:fonts/Meslo LG L DZ Regular for Powerline.otf"
  ".config/nvim:nvim"
)

backup_if_needed() {
  local target="$1"
  if [[ -e "$target" || -L "$target" ]]; then
    if [[ "$APPLY" -eq 1 ]]; then
      mkdir -p "$BACKUP_DIR"
      mv "$target" "$BACKUP_DIR/"
      echo "backed up existing $target -> $BACKUP_DIR/"
    else
      echo "would back up existing $target -> $BACKUP_DIR/"
    fi
  fi
}

link_one() {
  local dest_name="$1" src_rel="$2"
  local src="$DOTFILES_DIR/$src_rel"
  local dest="$HOME/$dest_name"

  if [[ -L "$dest" && "$(readlink "$dest")" == "$src" ]]; then
    echo "already linked: $dest"
    return
  fi

  backup_if_needed "$dest"

  if [[ "$APPLY" -eq 1 ]]; then
    mkdir -p "$(dirname "$dest")"
    ln -s "$src" "$dest"
    echo "linked $dest -> $src"
  else
    echo "would link $dest -> $src"
  fi
}

for entry in "${LINKS[@]}"; do
  dest_name="${entry%%:*}"
  src_rel="${entry#*:}"
  link_one "$dest_name" "$src_rel"
done

echo
echo "Homebrew packages (antidote, starship, eza, fzf, ...) are listed in Brewfile."
if [[ "$APPLY" -eq 1 ]]; then
  echo "Run 'brew bundle --file=$DOTFILES_DIR/Brewfile' to install them."
else
  echo "would suggest: brew bundle --file=$DOTFILES_DIR/Brewfile"
fi

echo
echo "iTerm2: the 'Gargantua' and 'Default' profiles from the old"
echo "com.googlecode.iterm2.plist are now available as a Dynamic Profile."
echo "Open iTerm2 -> Preferences -> Profiles to see them (no restart needed,"
echo "this does NOT overwrite your current iTerm preferences or profiles)."

echo
echo "This script never changes your default shell or touches ~/.zprezto."
echo "To switch shells yourself: chsh -s \$(which zsh)"