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+# -*- sh -*-
+
+# SFEED="$HOME/.sfeed"
+USER_AGENT='Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:78.0) Gecko/20100101 Firefox/78.0'
+# sfeedpath="$SFEED/feeds"
+maxjobs="$(nproc)"
+
+### Feeds #######################################################
+
+feeds() {
+        feeds_planets
+        feeds_youtube
+        feeds_podcasts
+        feeds_friends
+        feeds_news
+        feeds_smolweb
+        feeds_comics
+        feeds_misc
+        feeds_me
+}
+
+feeds_planets() {
+        feed "Planet Emacs" "https://planet.emacslife.com/atom.xml"
+        feed "Planet Lisp" "https://planet.lisp.org/rss20.xml"
+        feed "Planet Scheme" "https://planet.scheme.org/atom.xml"
+}
+
+feeds_youtube() {
+        feed "3Blue1Brown" 'https://www.youtube.com/feeds/videos.xml?channel_id=UCYO_jab_esuFRV4b17AJtAw'
+        feed "AB - Ancienne Belgique" 'https://www.youtube.com/feeds/videos.xml?channel_id=UCUVAw2kdxJlcfCdEcdgXv5A'
+        feed "Abraham Moller" 'https://www.youtube.com/feeds/videos.xml?channel_id=UCMfIwe2KHD2XoBO2lWqeFXg'
+        feed "Adam Ragusea" 'https://www.youtube.com/feeds/videos.xml?channel_id=UC9_p50tH3WmMslWRWKnM7dQ'
+        feed "Babish Culinary Universe" 'https://www.youtube.com/feeds/videos.xml?channel_id=UCJHA_jMfCvEnv-3kRjTCQXw'
+        feed "Baggers" 'https://www.youtube.com/feeds/videos.xml?channel_id=UCMV8p6Lb-bd6UZtTc_QD4zA'
+        feed "Case Duckworth" 'https://www.youtube.com/feeds/videos.xml?channel_id=UC92gRJdnUYklVu4pvj9n0Lw'
+        feed "Claire Saffitz x Dessert Person" 'https://www.youtube.com/feeds/videos.xml?channel_id=UCvw6Y1kr_8bp6B5m1dqNyiw'
+        feed "Computerphile" 'https://www.youtube.com/feeds/videos.xml?channel_id=UC9-y-6csu5WGm29I7JiwpnA'
+        feed "EBRPL Career Center" 'https://www.youtube.com/feeds/videos.xml?channel_id=UCIvntuaxP7PyaJDeHE_9E8Q'
+        feed "EmacsConf and Emacs hangouts" 'https://www.youtube.com/feeds/videos.xml?channel_id=UCwuyodzTl_KdEKNuJmeo99A'
+        feed "freeCodeCamp.org" 'https://www.youtube.com/feeds/videos.xml?channel_id=UC8butISFwT-Wl7EV0hUK0BQ'
+        feed "Gavin Freeborn" 'https://www.youtube.com/feeds/videos.xml?channel_id=UCJetJ7nDNLlEzDLXv7KIo0w'
+        feed "Henry Homesweet" 'https://www.youtube.com/feeds/videos.xml?channel_id=UCZqjwc1Wy5t1rsviYYsJiYg'
+        feed "Howard Abrams" 'https://www.youtube.com/feeds/videos.xml?channel_id=UCVHICXXtKG7rZgtC5xonNdQ'
+        feed "Ignite Talks" 'https://www.youtube.com/feeds/videos.xml?channel_id=UCZotK8ZPTUNLMeW5Q6T0cKg'
+        feed "Jake B" 'https://www.youtube.com/feeds/videos.xml?channel_id=UCBMMB7Yi0eyFuY95Qn2o0Yg'
+        feed "James Tomasino" 'https://www.youtube.com/feeds/videos.xml?channel_id=UCbTp1BYjpuhDRG5OmgIT8iw'
+        feed "jan Misali" 'https://www.youtube.com/feeds/videos.xml?channel_id=UCJOh5FKisc0hUlEeWFBlD-w'
+        feed "J Duckworth Animations" 'https://www.youtube.com/feeds/videos.xml?channel_id=UCtAEaNVrNxAUy2VSRPD_PYQ'
+        feed "Jelle's Marble Runs" 'https://www.youtube.com/feeds/videos.xml?channel_id=UCYJdpnjuSWVOLgGT9fIzL0g'
+        feed "John Kitchin" 'https://www.youtube.com/feeds/videos.xml?channel_id=UCQp2VLAOlvq142YN3JO3y8w'
+        feed "karthik" 'https://www.youtube.com/feeds/videos.xml?channel_id=UCbh_g91w0T6OYp40xFrtnhA'
+        feed "Ken Forkish" 'https://www.youtube.com/feeds/videos.xml?channel_id=UCvVvFZd0e86bLbd5FdgYiUg'
+        feed "Lex Fridman" 'https://www.youtube.com/feeds/videos.xml?channel_id=UCSHZKyawb77ixDdsGog4iWA'
+        feed "LockPickingLawyer" 'https://www.youtube.com/feeds/videos.xml?channel_id=UCm9K6rby98W8JigLoZOh6FQ'
+        feed "Maangchi" 'https://www.youtube.com/feeds/videos.xml?channel_id=UC8gFadPgK2r1ndqLI04Xvvw'
+        feed "Mike Zamansky" 'https://www.youtube.com/feeds/videos.xml?channel_id=UCxkMDXQ5qzYOgXPRnOBrp1w'
+        feed "MIT OpenCourseWare" 'https://www.youtube.com/feeds/videos.xml?channel_id=UCEBb1b_L6zDS3xTUrIALZOw'
+        feed "My Analog Journal" 'https://www.youtube.com/feeds/videos.xml?channel_id=UC8TZwtZ17WKFJSmwTZQpBTA'
+        feed "Nat's What I Reckon" 'https://www.youtube.com/feeds/videos.xml?channel_id=UCEFW1E8QzP-hKxjO2Rj68wg'
+        feed "Now You See It" 'https://www.youtube.com/feeds/videos.xml?channel_id=UCWTFGPpNQ0Ms6afXhaWDiRw'
+        feed "Numberphile" 'https://www.youtube.com/feeds/videos.xml?channel_id=UCoxcjq-8xIDTYp3uz647V5A'
+        feed "Philosophy Tube" 'https://www.youtube.com/feeds/videos.xml?channel_id=UC2PA-AKmVpU6NKCGtZq_rKQ'
+        feed "PronunciationManual" 'https://www.youtube.com/feeds/videos.xml?channel_id=UCqDSLtXeZsGc3dtVb5MW13g'
+        feed "Protesilaos Stavrou" 'https://www.youtube.com/feeds/videos.xml?channel_id=UC0uTPqBCFIpZxlz_Lv1tk_g'
+        feed "RailCowGirl" 'https://www.youtube.com/feeds/videos.xml?channel_id=UCj-Xm8j6WBgKY8OG7s9r2vQ'
+        feed "Simone Giertz" 'https://www.youtube.com/feeds/videos.xml?channel_id=UC3KEoMzNz8eYnwBC34RaKCQ'
+        feed "Steve Yegge" 'https://www.youtube.com/feeds/videos.xml?channel_id=UC2RCcnTltR3HMQOYVqwmweA'
+        feed "System Crafters" 'https://www.youtube.com/feeds/videos.xml?channel_id=UCAiiOTio8Yu69c3XnR7nQBQ'
+        feed "Tasting History with Max Miller" 'https://www.youtube.com/feeds/videos.xml?channel_id=UCsaGKqPZnGp_7N80hcHySGQ'
+        feed "Technology Connections" 'https://www.youtube.com/feeds/videos.xml?channel_id=UCy0tKL1T7wFoYcxCe0xjN6Q'
+        feed "Too Many Zooz" 'https://www.youtube.com/feeds/videos.xml?channel_id=UCtjXVqMVzBIgU0SO8AV0vPg'
+        feed "Townsends" 'https://www.youtube.com/feeds/videos.xml?channel_id=UCxr2d4As312LulcajAkKJYw'
+        feed "Unitarian Church of Baton Rouge" 'https://www.youtube.com/feeds/videos.xml?channel_id=UClrqHvbiFM-1hn931ZmAPFw'
+        feed "Vulf" 'https://www.youtube.com/feeds/videos.xml?channel_id=UCtWuB1D_E3mcyYThA9iKggQ'
+        feed "WFTDA: Women's Flat Track Derby Association" 'https://www.youtube.com/feeds/videos.xml?channel_id=UC7eMWpvytqd3gYAqxTl9w7g'
+        feed "Zach Anner" 'https://www.youtube.com/feeds/videos.xml?channel_id=UCPTVYxUoYWhNa8J7GzIGnyQ'
+}
+
+feeds_podcasts() {
+        feed "Tilde Whirl Tildeverse Podcast" 'https://tilde.town/~dozens/podcast/rss.xml'
+        feed "trash cat tech cat" 'https://podcast.librepunk.club/tctc/ogg.xml'
+        feed "Hacker Public Radio" 'https://hackerpublicradio.org/hpr_ogg_rss.php'
+}
+
+feeds_friends() {
+        # nihilazo
+        feed "lipu pi jan Niko" 'https://tilde.town/~nihilazo/index.xml'
+        # dozens
+        feed "chrismanbrown.gitlab.io (dozens)" 'https://chrismanbrown.gitlab.io/rss.xml'
+        feed "Dozens and Dragons" 'https://dozensanddragons.neocities.org/rss.xml'
+        feed "dozens: Society For Putting Things On Top Of Other Things" 'https://society.neocities.org/rss.xml'
+        feed "dozens: vgnfdblg" 'https://supervegan.neocities.org/feed.xml'
+        feed "dozens: backgammon" 'http://tilde.town/~dozens/backgammon/rss.xml'
+        feed "dozens: It's Pro Toad and Superb Owl" 'https://git.tilde.town/dozens/protoadandsuperbowl/raw/branch/master/feed.xml'
+        feed "dozens dreams" 'https://tilde.team/~dozens/dreams/rss.xml'
+        feed "dozens: write.as" 'https://write.tildeverse.org/dozens/feed/'
+        feed "dozens css art" 'http://tilde.town/~dozens/cssart/feed.xml'
+        ###
+        feed "Benjamin Wil" 'https://benjaminwil.info/feed.xml'
+        feed "(lambda (x) (create x))" 'http://lambdacreate.com/static/feed.rss'
+        feed "m455.casa" 'https://m455.casa/feed.rss'
+        feed "Oatmeal" 'https://eli.li/feed.rss'
+        feed "RSRSSS" 'https://envs.net/~lucidiot/rsrsss/feed.xml'
+        feed "Tomasino Blog" 'https://blog.tomasino.org/index.xml'
+        feed "Tomasino Labs" 'https://labs.tomasino.org/index.xml'
+        feed "Will's Blog" 'https://wflewis.com/feed.xml'
+        feed "Rick Carlino's Blog" 'https://rickcarlino.com/rss/feed.rss'
+        feed "Causal Agency" 'https://text.causal.agency/feed.atom'
+        feed "Benoit Joly" 'https://blog.benoitj.ca/posts/index.xml'
+        feed "p1k3::feed" 'https://p1k3.com/feed'
+        feed "linkbudz" 'https://linkbudz.m455.casa/feed.rss'
+        feed "Alex Schroeder" "https://alexschroeder.ch/wiki/feed/full/"
+        feed "Björn Wärmedal" "https://warmedal.se/~bjorn/atom.xml"
+        feed "a rickety bridge of impossible crossing" "https://bluelander.bearblog.dev/feed/"
+}
+
+feeds_comics() {
+        feed "Cat and Girl" 'https://catandgirl.com/feed/'
+        feed "Dinosaur Comics!" 'https://qwantz.com/rssfeed.php'
+        feed "False Knees" 'https://falseknees.tumblr.com/rss'
+        feed "Saturday Morning Breakfast Cereal" 'https://www.smbc-comics.com/comic/rss'
+        feed "xkcd" 'https://xkcd.com/atom.xml'
+}
+
+feeds_news() {
+        feed "tilde news: Private feed for acdw" \
+                'https://tilde.news/rss?token=FvdFj8rQkhrBy9j1yON1t6RYKDdcuG1MoUlyvRICmbgDGCf2JTWAEObDhdgt'
+        feed "Tildes Atom feed" 'https://tildes.net/topics.atom'
+        feed "NPR" "https://feeds.npr.org/1001/rss.xml"
+}
+
+feeds_me() {
+        :
+}
+
+feeds_smolweb() {
+        feed "~town friday postcard" 'https://tilde.town/~lucidiot/fridaypostcard.xml'
+        feed "Cosmic Voyage" 'https://cosmic.voyage/rss.xml'
+        feed "plan.cat" 'https://plan.cat/rss'
+}
+
+feeds_misc() {
+        feed "Crystalverse" 'https://crystalverse.com/feed/'
+        feed "Hetzner" 'https://status.hetzner.com/en.atom'
+        feed "LOW-TECH MAGAZINE" 'https://feeds2.feedburner.com/typepad/krisdedecker/lowtechmagazineenglish'
+}
+
+### Filter ######################################################
+
+filter() {
+        case "$1" in
+        # Filter items based on feed name.
+        *NPR*)
+                sed 's@www\.npr\.org@text.npr.org@'
+                ;;
+        *) cat ;;
+        esac |
+                filter_add_empties |
+                filter_html_entities |
+                filter_embed_youtube |
+                filter_filter_links
+}
+
+filter_add_empties() {
+        awk 'BEGIN{FS="\t";OFS=FS;}
+        { $2 = $2 ? $2 : "[empty]" }
+        { print $1,$2,$3,$4,$5,$6,$7,$8,$9; }
+'
+}
+
+filter_embed_youtube() {
+        # replace youtube links with embed links
+        sed 's@www.youtube.com/watch?v=@www.youtube.com/embed/@g'
+}
+
+filter_filter_links() {
+        # shorten feedburner links and strip tracking parameters and pixels
+        awk -F '\t' 'BEGIN { OFS = "\t"; }
+        function filterlink(s) {
+                # protocol must start with http, https or gopher.
+                if (match(s, /^(http|https|gopher):\/\//) == 0) {
+                        return "";
+                }
+                # shorten feedburner links.
+                if (match(s, /^(http|https):\/\/[^\/]+\/~r\/.*\/~3\/[^\/]+\//)) {
+                        s = substr($3, RSTART, RLENGTH);
+                }
+                # strip tracking parameters
+                # urchin, facebook, piwik, webtrekk and generic.
+                gsub(/\?(ad|campaign|fbclid|pk|tm|utm|wt)_([^&]+)/, "?", s);
+                gsub(/&(ad|campaign|fbclid|pk|tm|utm|wt)_([^&]+)/, "", s);
+                gsub(/\?&/, "?", s);
+                gsub(/[\?&]+$/, "", s);
+                return s
+        }
+        {
+                $3 = filterlink($3); # link
+                $8 = filterlink($8); # enclosure
+                # try to remove tracking pixels: <img/> tags with 1px width or height.
+                gsub("<img[^>]*(width|height)[[:space:]]*=[[:space:]]*[\"'"'"' ]?1[\"'"'"' ]?[^0-9>]+[^>]*>", "", $4);
+                print $0;
+        }'
+}
+
+filter_html_entities() {
+        # convert HTML entities into dumb counterparts
+        awk '{
+        gsub(/&#34;/,"\""); gsub(/&#x22;/,"\"");
+        gsub(/&#39;/,"'\''"); gsub(/&#x27;/,"'\''");
+        gsub(/&amp;/,"\\&"); # MUST BE LAST!;
+        print
+}'
+}
+
+# Fetch #########################################################
+
+fetch() { # fetch(name, url, feedfile)
+        # return
+        curl -s -L \
+                --max-redirs 3 \
+                --header "'User-Agent: $USER_AGENT'" \
+                --fail \
+                --max-time 15 \
+                "$2"
+}