#!/bin/sh

# load config (evaluate shellscript).
# loadconfig(configfile)
loadconfig() {
	# allow to specify config via argv[1].
	if [ "$1" != "" ]; then
		# get absolute path of config file required for including.
		config="$1"
		configpath=$(readlink -f "${config}" 2>/dev/null)
	else
		# default config location.
		config="$HOME/.sfeed/sfeedrc"
		configpath="${config}"
	fi

	# config is loaded here to be able to override $sfeedpath or functions.
	if [ -r "${configpath}" ] && [ -f "${configpath}" ]; then
		. "${configpath}"
	else
		printf "Configuration file \"%s\" cannot be read.\n" "${config}" >&2
		echo "See the sfeedrc.example file or the sfeedrc(5) man page for an example." >&2
		exit 1
	fi
}

# override feed function to output OPML XML.
# feed(name, feedurl, [basesiteurl], [encoding])
feed() {
	# uses the characters 0x1f and 0x1e as a separator.
	printf '%s\037%s\036' "$1" "$2"
}

# load config file.
loadconfig "$1"

cat <<!
<?xml version="1.0" encoding="UTF-8"?>
<opml version="1.0">
<head>
	<title>OPML export</title>
</head>
<body>
!

feeds | LC_ALL=C awk '
BEGIN {
	FS = "\x1f"; RS = "\x1e";
}
{
	gsub("&", "\\&amp;");
	gsub("\"", "\\&quot;");
	gsub("'"'"'", "\\&#39;");
	gsub("<", "\\&lt;");
	gsub(">", "\\&gt;");

	print "\t<outline type=\"rss\" title=\"" $1 "\" text=\"" $1 "\" xmlUrl=\"" $2 "\"/>";
}'

cat <<!
</body>
</opml>
!
