mkanimedir

#!/bin/bash
set -eo pipefail

throw() {
  printf '%s: %s\n' "${0##*/}" "$1" >&2
  return 1
}

sanitize_filename() {
  # Replaces chars invalid in Windows file/dir names with a space
  perl -pe 's/[<>:"\/\\|?*]/ /g; s/ +/ /g; s/^ +|[ \.]+$//g' <<<"$1"
}

if [[ $# == 0 || $1 =~ ^(--help|-h)$ ]]; then
  cat >&2 <<EOF
Usage: mkanimedir <mal link> [<nyaa link>] [<dir>|<files...>]

Creates (or renames) a directory with the anime name and image (as a hidden
folder.jpg) from MAL, moving any given files into it.

If given a nyaa URL, will create a readme.md as well (using mkanimereadme).

Example:
  mkanimedir https://myanimelist.net/anime/6547/Angel_Beats
EOF
  exit 1
fi

# Parse options
mal_id=
nyaa_url=
existing_dir=
files=()
while (( $# > 0 )); do
  case $1 in
    -*)
      throw "unknown option: $1"
      ;;
    https://myanimelist.net/*)
      if [[ ! $1 =~ ^https://myanimelist.net/anime/([[:digit:]]+) ]]; then
        throw 'unrecognized mal url'
      fi
      mal_id=${BASH_REMATCH[1]}
      ;;
    https://*nyaa.si/*)
      nyaa_url=$1
      ;;
    *)
      if [[ -d $1 ]]; then
        if [[ $existing_dir ]]; then
          throw 'multiple directories given'
        fi
        existing_dir=$1
      elif [[ -f $1 ]]; then
        files+=("$1")
      else
        throw "'$1' is neither an option nor a file or directory..."
      fi
      ;;
  esac
  shift
done

# Get mal info
if ! json=$(curl -sSL "https://api.jikan.moe/v4/anime/$mal_id"); then
  throw 'failed to get mal data from jikan.moe'
fi

title=$(jq -r .data.title <<<"$json")
image=$(jq -r .data.images.jpg.large_image_url <<<"$json")

if [[ ! $title || $title == 'null' ]]; then
  throw "$(printf 'unexpected response from jikan.moe:\n\n%s' "$(jq -C . <<<"$json" 2>/dev/null || echo "$json")")"
fi

# Create or rename directory
base=$(dirname "$existing_dir") # . if empty
dir=$base/$(sanitize_filename "$title")

if [[ ! $existing_dir -ef "$dir" ]]; then
  if [[ -e $dir ]]; then
    throw "a file/directory named '$dir' already exists"
  fi

  if [[ $existing_dir ]]; then
    mv "$existing_dir" "$dir"
    echo "Renamed '$existing_dir' to '$dir'"
  else
    mkdir "$dir"
    echo "Created $dir"
  fi
fi

# Download image
if [[ $image && $image != 'null' ]]; then
  folderjpg="$dir/folder.jpg"
  curl -fsSL "$image" -o "$folderjpg"

  # Hide folder.jpg if on Windows
  if command -v wslpath &>/dev/null; then
    attrib.exe +h "$(wslpath -w "$folderjpg")"
    echo "Downloaded folder.jpg (and set as hidden)"
  else
    echo "Downloaded folder.jpg"
  fi
else
  echo "No folder.jpg was created, as the api did not return an image" >&2
fi

# Create readme
if [[ $nyaa_url ]]; then
  mkanimereadme "$nyaa_url" "$dir"
fi

# Move files into directory
if (( ${#files[@]} > 0 )); then
  mv -t "$dir" "${files[@]}"
  echo "Moved ${#files[@]} files"
fi