#!/bin/bash
# Search 4chan archives based on FoolFuuka
# Output: one post per line in HTML, prefixed with the post ID
#  Note that posts can appear multiple times in the output in some cases. You're encouraged to filter based on the post ID.
domain="$1"
q="$2"
end=
nextend=2038-01-19
while :
do
	end="${nextend}"
	content=$(curl -s "https://${domain}/_/search/text/${q}/end/${end}/page/${page}/")

	declare -i page=1
	while [[ ${page} -lt 201 ]]
	do
		echo "Grabbing https://${domain}/_/search/text/${q}/end/${end}/page/${page}/" >&2
		content=$(curl -s "https://${domain}/_/search/text/${q}/end/${end}/page/${page}/")
		tr -d '\n' <<<"${content}" | grep -Po '<article class="post.*?</article>' | perl -pe 's,^(.*?id="(\d+)".*$),\2 \1,'

		# Get last date seen to update end date; subtract one because the search appears to be a bit unreliable
		nextend="$(date --date="@$(($(date --date="$(tr -d '\n' <<<"${content}" | grep -Po '<article class="post.*?</article>' | tail -1 | grep -Po '<time datetime="\K[^"]+')" '+%s') - 86400))" '+%Y-%m-%d')"

		if grep -qF '<div class="alert"' <<<"${content}"
		then
			if ! tr -d '\n' <<<"${content}" | grep -Po '<div class="alert".*?</div>' | grep -q 'No results found'
			then
				echo "Error" >&2
				break
			else
				break 2
			fi
		fi
		page+=1
	done
done