#!/bin/sh
# -*- sh -*-
# update feeds, merge with old feeds using xargs in parallel mode (non-POSIX).

# include script and reuse its functions, but do not start main().
SFEED_UPDATE_INCLUDE="1" . sfeed_update
# load config file, sets $config.
loadconfig "$1"

# process a single feed.
# args are: config, tmpdir, name, feedurl, basesiteurl, encoding
if [ "${SFEED_UPDATE_CHILD}" = "1" ]; then
	sfeedtmpdir="$2"
	_feed "$3" "$4" "$5" "$6"
	exit $?
fi

# ...else parent mode:

# feed(name, feedurl, basesiteurl, encoding)
feed() {
	# workaround: *BSD xargs doesn't handle empty fields in the middle.
	name="${1:-$$}"
	feedurl="${2:-http://}"
	basesiteurl="${3:-${feedurl}}"
	encoding="$4"

	printf '%s\0%s\0%s\0%s\0%s\0%s\0' "${config}" "${sfeedtmpdir}" \
		"${name}" "${feedurl}" "${basesiteurl}" "${encoding}"
}

# fetch feeds and store in temporary directory.
sfeedtmpdir="$(mktemp -d '/tmp/sfeed_XXXXXX')"
mkdir -p "${sfeedtmpdir}/feeds"
touch "${sfeedtmpdir}/ok"
# make sure path exists.
mkdir -p "${sfeedpath}"
# print feeds for parallel processing with xargs.
feeds | SFEED_UPDATE_CHILD="1" xargs -r -0 -P "${maxjobs}" -L 6 "$(readlink -f "$0")"
status=$?
# check error exit status indicator for parallel jobs.
test -f "${sfeedtmpdir}/ok" || status=1

## TODO: further processing for feed metadata
# ${sfeedtmpdir}/feeds/*

# cleanup temporary files etc.
cleanup
exit ${status}