install.sh

#!/usr/bin/env bash
#
# install.sh — installs the Foreglow theme family for Vim and/or Neovim.
#
# Usage:
#   ./install.sh [theme]
#
#   theme   one of: foreglow (default) | afterglow | airglow | alpenglow

set -euo pipefail

REPO_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
THEMES=(foreglow afterglow airglow alpenglow)
THEME="${1:-foreglow}"

is_valid_theme() {
  local t="$1"
  for known in "${THEMES[@]}"; do
    [[ "$t" == "$known" ]] && return 0
  done
  return 1
}

if ! is_valid_theme "$THEME"; then
  echo "Unknown theme: $THEME"
  echo "Choose one of: ${THEMES[*]}"
  exit 1
fi

install_for() {
  local pack_root="$1"   # e.g. ~/.vim or ~/.config/nvim
  local rc_file="$2"     # e.g. ~/.vimrc or ~/.config/nvim/init.vim
  local label="$3"       # "Vim" or "Neovim"

  local start_dir="$pack_root/pack/themes/start"
  local dest="$start_dir/foreglow"

  mkdir -p "$start_dir"

  for other in "${THEMES[@]}"; do
    local other_dir="$start_dir/$other"
    if [[ -d "$other_dir" && "$other_dir" != "$dest" ]]; then
      rm -rf "$other_dir"
    fi
  done

  rm -rf "$dest"
  mkdir -p "$dest"
  cp -r "$REPO_DIR/autoload" "$dest/"
  cp -r "$REPO_DIR/colors" "$dest/"
  [[ -d "$REPO_DIR/doc" ]] && cp -r "$REPO_DIR/doc" "$dest/"
  [[ -d "$REPO_DIR/after" ]] && cp -r "$REPO_DIR/after" "$dest/"

  mkdir -p "$(dirname "$rc_file")"
  touch "$rc_file"

  # Strip any previously-managed block, then write a fresh one.
  if grep -q '" >>> foreglow >>>' "$rc_file"; then
    local tmp
    tmp="$(mktemp)"
    awk '/" >>> foreglow >>>/{skip=1} /" <<< foreglow <<</{skip=0; next} !skip' "$rc_file" > "$tmp"
    mv "$tmp" "$rc_file"
  fi

  {
    echo '" >>> foreglow >>>'
    echo 'syntax on'
    echo 'filetype plugin indent on'
    echo "if has('termguicolors')"
    echo '  set termguicolors'
    echo 'endif'
    echo "colorscheme $THEME"
    echo '" <<< foreglow <<<'
  } >> "$rc_file"

  echo "[$label] Installed '$THEME' -> $dest"
  echo "[$label] Configured in $rc_file"
}

install_for "$HOME/.vim" "$HOME/.vimrc" "Vim"

if command -v nvim >/dev/null 2>&1; then
  install_for "$HOME/.config/nvim" "$HOME/.config/nvim/init.vim" "Neovim"
fi

echo ""
echo "Done. Restart Vim/Neovim to see '$THEME'."
echo "Re-run with a different name any time, e.g.: ./install.sh airglow"