#!/usr/bin/env bash

function trysuffex(){
	local suffix="$1"
	local response=$(curl -L -A "$useragent" --write-out %{http_code} --silent --output /dev/null "$url/$suffix")
	[ "$response" -eq "200" ] && (echo "$url/$suffix"; return 0) || return 1
}

# Remove trailing slash if there is one
url="${1%/}"

# User FF's user agent
useragent="Mozilla/5.0 (X11; Linux x86_64; rv:76.0) Gecko/20100101 Firefox/76.0"

page="$(curl -A "$useragent" -s -L "$url")"

# Look for alternate links with atom or rss type
echo "$page" | hq 'link[rel=alternate][type="application/rss+xml"]' attr href | awk '{print "RSS:  " $0}'
echo "$page" | hq 'link[rel=alternate][type="application/atom+xml"]' attr href | awk '{print "Atom: " $0}'

# Try common url patterns
trysuffex "feed" | awk '{print "200:  " $0}'
sleep 0.2
trysuffex ".rss" | awk '{print "200:  " $0}'