# This is an sfeedrc(5) configuration file for sfeed_update(1).

# The key difference is that it truncates your feed files at every update,
# keeping only new posts. This saves you the work of filtering out old posts.


# You probably want to EDIT this.
sfeedpath="$HOME/.config/sfeed_mastodon/"


# You probably want to EDIT this.
# This contains a list of all your feeds, in the format:
#     feed NAME URL DOMAIN ENCODING
feeds() {
	feed "Planet GNU" "https://planet.gnu.org/rss20.xml"     "https://planet.gnu.org"  "UTF-8"
	feed "Tiriftjo"   "https://tirifto.xwx.moe/en/news.atom" "https://tirifto.xwx.moe" "UTF-8"
}


# This overrides sfeed_update’s default merge() function.
# This makes it so that only new and unseen posts are put in the feed file.
# This is done by storing the date of the latest post in an extended attribute,
# for comparison during the next update..
merge() {
	local oldfile="$2"
	local newfile="$3"

	local previous_max_date="$(attr -q -g sfeed_latest "$oldfile" 2> /dev/null)"
	if test -z "$previous_max_date"; then
		previous_max_date=0
	fi

	# Update the date of the last-processed post.
	local latest_date="$(latest_date "$newfile")"
	attr -qs sfeed_latest -V "$latest_date" "$oldfile" 2> /dev/null

	# Output only new and unprocessed posts.
	after_date "$newfile" "$previous_max_date"
}


# Given an sfeed file, this returns the date of the latest post (in seconds
# since the UNIX epoch).
latest_date() {
	local file="$1"
	awk -F '\t' \
		'$1 > latest { latest = $1 } END { print latest }' \
		"$file"
}


# This outputs only lines of an sfeed file with a date after the given min_date
# (in seconds since UNIX epoch).
after_date() {
	local file="$1"
	local min_date="$2"
	awk -F '\t' -v min_date="$min_date" \
		'$1 > min_date { print $0 }' \
		"$file"
}