#!/bin/bash
# Search 4chan archives based on FoolFuuka
# Searches each board individually to get as much content as possible due to the 5000 results limit
# Output: one post per line in HTML
domain="$1"
q="$2"
curl -s "https://${domain}/" | grep -Po 'href="(https?://'"$(sed 's/[]\.|$(){}?+*^]/\\&/g' <<<"${domain}")"')?/\K[^/]+(?=/")' | awk '!seen[$0]++' | while read -r board
do
	content=$(curl -s "https://${domain}/${board}/search/text/${q}/")
	if grep -qP '<h3 class="section_title">.*Returning only' <<<"${content}"
	then
		echo "Warning: only 5000 results!" >&2
	fi

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