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

log() { echo -e "\033[0;34m[INFO]\033[0m $*"; }
warn() { echo -e "\033[1;33m[WARN]\033[0m $*"; }
err()  { echo -e "\033[0;31m[ERR ]\033[0m $*" >&2; }

require_cmd() {
  local miss=0
  for c in "$@"; do
    if ! command -v "$c" >/dev/null 2>&1; then err "missing command: $c"; miss=1; fi
  done
  [[ $miss -eq 0 ]]
}

today_version() { date +%Y%m%d; }

checksum_dir() {
  local dir="$1"; local out="$2"; : > "$out";
  (cd "$dir" && find . -type f -print0 | sort -z | xargs -0 sha256sum) >> "$out"
}

make_dir() { mkdir -p "$1"; }

copy_tree() {
  local src="$1" dst="$2"; rsync -a --delete "$src/" "$dst/" 2>/dev/null || cp -r "$src/." "$dst/";
}

gen_manifest() {
  local root="$1"; local out="$2"; : > "$out";
  (cd "$root" && find . -maxdepth 4 -type f -printf "%p\n" | sort) >> "$out"
}