indico

#!/usr/bin/env bash

function mkd { [[ -d $1 ]] || mkdir -p "$1"; }
function string#match { [[ $1 =~ $2 ]]; }
function install/cp { [[ $1 -ot $2 ]] || cp "$1" "$2"; }

function chkcmds {
  type -t "$@" &>/dev/null && return 0

  echo "indico: this operation requires the commands: $*." >&2
  local cmd
  for cmd; do
    type -t "$cmd" &>/dev/null || echo "indico: please install $cmd." >&2
  done
  return 1
}

_dl_useragent='Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/100.0.4896.88 Safari/537.36'
_dl_cooldown=0
_dl_cooldown_default=3
_dl_cooldown_fail=2
function dl() {
  local url=$1 dst=$2
  [[ -f $dst ]] && return 3
  local agent=$_dl_useragent

  local cooldown=$((_dl_cooldown))
  if ((cooldown)); then
    sleep "$cooldown"
    _dl_cooldown=0
  fi

  if
    wget -nv --show-progress --user-agent="$agent" "$url" -O "$dst.part" &&
      [[ -s $dst.part ]] &&
      mv "$dst.part" "$dst"
  then
    _dl_cooldown=$_dl_cooldown_default
  else
    rm -f "$dst.part"
    _dl_cooldown=$_dl_cooldown_fail
  fi
}

function sub:download/down { dl "$1" "$outdir/$2"; }
function sub:download {
  # input check
  if ! string#match "$1" '^(https?://[^/]+)/event/([0-9]+)'; then
    echo "indico: failed to analyze the indicto event URL." >&2
    return 2
  fi
  local baseurl=${BASH_REMATCH[1]}
  local event=${BASH_REMATCH[2]}
  if [[ ! $2 ]]; then
    echo "indico: output directory is not specified." >&2
    return 2
  fi
  local outdir=$2

  # env check
  chkcmds wget jq npm node || return $?

  if ! mkd "$outdir"; then
    echo "indico: failed to create the output directory '$outdir'." >&2
    return 1
  fi

  local url_timetable=$baseurl/event/$event/timetable
  dl "$url_timetable" "$outdir"/timetable0.tmp
  if (($?!=0&&$?!=3)); then
    echo "indico: failed to download '$url_timetable'" >&2
    return 1
  fi

  < "$outdir"/timetable0.tmp sed -n '/^[[:space:]]*var timetableArgs =/{n;n;s/,[[:space:]]*$//;p;q;}' | jq '
    [
      [keys_unsorted,[.[]]] | transpose | .[] | {
        date:.[0],
        session:.[1][]
      } | select(.session.entries != null) | {
        date: .date,
        session: .session.title,
        talk: .session.entries[] | select(has("presenters")) | {
          author: .presenters[0].name,
          title: .title,
          attach: [if .attachments.files != null then [.attachments.files[].download_url] else [] end][0],
          desc: .description,
        }
      } | {
        date: .date,
        session: (.date + " " + .session),
        author: .talk.author,
        title: .talk.title,
        attach: .talk.attach,
        desc: .talk.desc,
      }
    ]
  ' > "$outdir"/timetable1.tmp
  
  local -x indico_input=$outdir/timetable1.tmp
  local -x indico_baseurl=$baseurl
  npm install agh.sprintf
  node indico-timetable2html.js > "$outdir"/index.html
  install/cp slides.css "$outdir"/slides.css
  install/cp slides.js  "$outdir"/slides.js

  sed -n 's|^[[:space:]]*<!-- DOWNLOAD \(.*\) -->.*|sub:download/down \1|p' "$outdir"/index.html > "$outdir"/timetable3.tmp &&
    source "$outdir"/timetable3.tmp
}

if ((!$#)); then
  echo "usage: ./indico download <indico-event-url> <output-directory>" >&2
  return 2
elif ! declare -f "sub:$1" &>/dev/null; then
  echo "indico: unrecognized subcommand '$1'" >&2
  return 2
else
  "sub:$@"
fi