#!/usr/bin/env bash
# Writes Sources/TodoApp/Assets.swift: the shared TodoMVC CSS and this app's
# static files, embedded byte for byte so the binary is the whole app.
#   tools/embed.sh <shared-dir> <static-dir> <out.swift>
set -euo pipefail
shared=$1 static=$2 out=$3
tmp=$(mktemp "$out.XXXXXX")
trap 'rm -f "$tmp"' EXIT
literal() {
  if grep -q '"""#' "$1"; then echo "embed.sh: $1 contains \"\"\"#" >&2; exit 1; fi
  printf '    static let %s = #"""\n' "$2"
  cat "$1"
  # A raw multi-line literal drops the newline before its closing
  # delimiter, so add one to keep the file's own final newline.
  printf '\n"""#\n\n'
}
{
  printf '// GENERATED by tools/embed.sh from shared/ and static/. Do not edit.\n\n'
  printf 'enum Assets {\n'
  literal "$shared/base.css" baseCSS
  literal "$shared/index.css" indexCSS
  literal "$static/app.css" appCSS
  literal "$static/app.js" appJS
  printf '}\n'
} > "$tmp"
if cmp -s "$tmp" "$out"; then exit 0; fi
mv "$tmp" "$out"
trap - EXIT