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+#!/usr/bin/awk -f
+## Converts sfeed(1) files into an Actually Simple Sindication
+## (ASS) file.  See https://tilde.town/~dzwdz/ass/ for details.
+
+## THE SPEC
+
+# An .ass file consists of a bunch of lines. Every line represents an item
+# (e.g. article).
+
+# Every line consists of:
+
+# an ISO-8601 formatted date with dashes the URI of the item (optionally) the
+# title of the item
+
+# Those elements are separated by tabs. Every tab after the URI is treated as
+# part of the title. The order of the lines doesn't matter. Additional
+# whitespace before the date is NOT permitted.
+
+# Lines can also be empty or start with the # character. Those lines are to be
+# ignored by clients. I recommend adding a comment with a link to this page at
+# the top, so people won't get confused about what to do with the file.
+
+# It's very highly recommended to name the file "feed.ass". This will make feed
+# discovery much easier. If you want to get added to the list of known feeds,
+# you MUST name your feed that (the 2 feeds in there are grandfathered in).
+BEGIN {
+        FS = "\t"
+        OFS = "\t"
+}
+
+{
+        datecmd = "date -u -d '@" ($1 ? $1 : 0) "' +%F"
+        datecmd | getline timestamp
+        close(datecmd)
+        title = $2
+        link = $3
+        print timestamp, link, title
+        if (++line > 25) {
+                printf(".") > "/dev/stderr"
+                line = 0
+        }
+}
+
+END {
+        print("ok") > "/dev/stderr"
+}
+