tuiApps: add sfeed

hosts/common/programs/assorted.nix

@@ -85,6 +85,7 @@ let
     inherit (pkgs)
       aerc  # email client
       offlineimap  # email mailox sync
+      sfeed  # RSS fetcher
       visidata  # TUI spreadsheet viewer/editor
       w3m
     ;

hosts/common/programs/default.nix

@@ -19,6 +19,7 @@
     ./newsflash.nix
     ./offlineimap.nix
     ./ripgrep.nix
+    ./sfeed.nix
     ./splatmoji.nix
     ./steam.nix
     ./sublime-music.nix

hosts/common/programs/sfeed.nix

@@ -0,0 +1,28 @@
+# simple RSS and Atom parser
+# - <https://codemadness.org/sfeed-simple-feed-parser.html>
+# - used by sxmo
+# - man 5 sfeedrc
+#
+# call `sfeed_update` to query each feed and populate entries in ~/.sfeed/feeds
+{ lib, config, sane-lib, ... }:
+let
+  feeds = sane-lib.feeds;
+  allFeeds = config.sane.feeds;
+  wantedFeeds = feeds.filterByFormat ["text"] allFeeds;
+  sfeedEntries = builtins.map (feed:
+    # format:
+    # feed <name> <feedurl> [basesiteurl] [encoding]
+    lib.escapeShellArgs [ "feed" (if feed.title != null then feed.title else feed.url) feed.url ]
+  ) wantedFeeds;
+in {
+  sane.programs.sfeed = {
+    fs.".sfeed/sfeedrc".symlink.text = ''
+      feeds() {
+        ${lib.concatStringsSep "\n  " sfeedEntries}
+      }
+    '';
+
+    # this is where the parsed feed items go
+    persist.plaintext = [ ".sfeed/feeds" ];
+  };
+}