55 lines
1.7 KiB
Nix
55 lines
1.7 KiB
Nix
{ lib, ... }:
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rec {
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# PRIMARY API: generate a OPML file from a list of feeds
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feedsToOpml = feeds: opmlTopLevel (opmlGroups (partitionByCat feeds));
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# only keep feeds whose category is one of the provided
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filterByFormat = fmts: builtins.filter (feed: builtins.elem feed.format fmts);
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## INTERNAL APIS
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# transform a list of feeds into an attrs mapping cat => [ feed0 feed1 ... ]
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partitionByCat = feeds: builtins.groupBy (f: f.cat) feeds;
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xmlTag = tag: close: attrs:
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let
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fmt-attrs = builtins.concatStringsSep
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" "
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(lib.mapAttrsToList (name: value: ''${lib.escapeXML name}="${lib.escapeXML value}"'') attrs);
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fmt-close = if close then "/" else "";
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in
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''<${tag} ${fmt-attrs} ${fmt-close}>'';
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# represents a single RSS feed.
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opmlTerminal = feed: xmlTag "outline" true (
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{
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xmlUrl = feed.url;
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type = "rss";
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} // lib.optionalAttrs (feed.title != null) {
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title = feed.title;
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}
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);
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# a list of RSS feeds.
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opmlTerminals = feeds: lib.concatStringsSep "\n" (builtins.map opmlTerminal feeds);
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# one node which packages some flat grouping of terminals.
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opmlGroup = title: feeds: ''
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<outline text="${title}" title="${title}">
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${opmlTerminals feeds}
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</outline>
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'';
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# a list of groups (`groupMap` is an attrs mapping groupName => [ feed0 feed1 ... ]).
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opmlGroups = groupMap: lib.concatStringsSep "\n" (
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builtins.attrValues (builtins.mapAttrs opmlGroup groupMap)
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);
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# top-level OPML file which could be consumed by something else.
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opmlTopLevel = body: ''
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<?xml version="1.0" encoding="utf-8"?>
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<opml version="2.0">
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<body>
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${body}
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</body>
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</opml>
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'';
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}
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