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#!/bin/bash
if [ -z "$1" -o ! -d "$1" ]; then
echo "Usage: $0 <top-directory> [<days ago>]" 1>&2
exit 1
fi
top="${1}"
shift
source "${top}/etc/settings.sh"
tmp="$(mktemp -d)"
cd "${tmp}"
browser="Mozilla/4.76 [de] (X11; U; Linux 2.2.18 i586)"
newn="${day}.png"
# get url
echo $(date -d"$daysago days ago" +%Y-%-m-%-d)
url="$(wget ${wget_args} -U "$browser" https://xkcd.com/archive/ -O - | \
grep -o "href=\".*\" .*\"$(date -d"$daysago days ago" +%Y-%-m-%-d)\"" | \
sed 's/^href="\(.*\)" title.*$/\1/')"
if [ -n "$url" ]; then
# fetch comic
wget ${wget_args} -U "$browser" "https://www.xkcd.com${url}" -O index.html
url=$(grep -A 1 "Image URL" index.html | sed 'N;s/.*\(http.*png\)<\?.*/\1/')
imgname=$(echo "$url" | tr '/' '\n' | tail -1)
# get additional information
img_tag=$(grep -A2 "src=\"${url:5}" index.html | sed 'N;N;s/.*\(<img [^>]\+>\).*/\1/')
alt=$(sed 's/.*title="\([^"]*\)".*/\1/'<<< $img_tag)
title=$(sed 's/.*alt="\([^"]*\)".*/\1/'<<< $img_tag)
wget ${wget_args} -U "$browser" -O "${tmp}/${newn}" --header="Referer: https://www.xkcd.com/" "$url"
if [ -s "${tmp}/${newn}" ]; then
# save
mv "${tmp}/${newn}" "${image_dir}/$newn"
echo "$title" > "${image_dir}/${day}.title"
echo "$alt" > "${image_dir}/${day}.alt"
# update symlinks
rm -f "${comic_dir}/latest.png" "${comic_dir}/latest.title" "${comic_dir}/latest.alt"
ln -s "${image_offset}/$newn" "${comic_dir}/latest.png"
ln -s "${image_offset}/${day}.title" "${comic_dir}/latest.title"
ln -s "${image_offset}/${day}.alt" "${comic_dir}/latest.alt"
fi
fi
rm -rf ${tmp}
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