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annotate mod_pubsub_summary/mod_pubsub_summary.lua @ 4426:3fe2c264aac4

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mod_pubsub_summary: Mangle HTML payloads in Atom/RSS feeds This module is meant for use with mod_pubsub_feeds and tries to improve on mod_pubsub's built-in Atom summary generator.
author Kim Alvefur <zash@zash.se>
date Thu, 04 Feb 2021 01:12:41 +0100
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children a620bf249e63
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4426
3fe2c264aac4 mod_pubsub_summary: Mangle HTML payloads in Atom/RSS feeds
Kim Alvefur <zash@zash.se>
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1 -- No, not trying to parse HTML here. It's an illusion. Just trying to read RSS feeds.
3fe2c264aac4 mod_pubsub_summary: Mangle HTML payloads in Atom/RSS feeds
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2 --
3fe2c264aac4 mod_pubsub_summary: Mangle HTML payloads in Atom/RSS feeds
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3 -- Compose a textual representation of Atom payloads
3fe2c264aac4 mod_pubsub_summary: Mangle HTML payloads in Atom/RSS feeds
Kim Alvefur <zash@zash.se>
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4 module:hook("pubsub-summary/http://www.w3.org/2005/Atom", function (event)
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5 local payload = event.payload;
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6 local title = payload:get_child_text("title");
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Kim Alvefur <zash@zash.se>
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7 local content_tag = payload:get_child("content") or payload:get_child("summary");
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8 local content = content_tag:get_text();
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9 if content_tag.attr.type == "html" then
3fe2c264aac4 mod_pubsub_summary: Mangle HTML payloads in Atom/RSS feeds
Kim Alvefur <zash@zash.se>
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10 content = content:gsub("\n*<p[^>]*>\n*(.-)\n*</p>\n*", "%1\n\n");
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11 content = content:gsub("<li>(.-)</li>\n", "* %1\n");
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12 content = content:gsub("<a[^>]*href=[\"'](.-)[\"'][^>]*>(.-)</a>", "%2 <%1>");
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13 content = content:gsub("<b>(.-)</b>", "*%1*");
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14 content = content:gsub("<strong>(.-)</strong>", "*%1*");
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15 content = content:gsub("<em>(.-)</em>", "*%1*");
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16 content = content:gsub("<i>(.-)</i>", "*%1*");
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Kim Alvefur <zash@zash.se>
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17 content = content:gsub("<img[^>]*src=[\"'](.-)[\"'][^>]*>", " %1 "); -- TODO alt= would have been nice to grab
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Kim Alvefur <zash@zash.se>
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18 content = content:gsub("<br[^>]*>", "\n");
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19 content = content:gsub("<[^>]+>", "");
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20 content = content:gsub("^%s*", ""):gsub("%s*$", "");
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21 content = content:gsub("\n\n\n+", "\n\n");
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22 content = content:gsub("&(%w+);", {
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23 apos = "'";
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24 quot = '"';
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25 lt = "<";
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26 gt = ">";
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27 amp = "&";
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28 nbsp = utf8 and utf8.char(0xa0) or " ";
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29 });
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30 end
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31 local link = payload:get_child("link");
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32 local summary;
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33 if title and content then
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34 summary = title .. "\n\n" .. content;
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35 elseif title or content then
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36 summary = content or title;
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37 end
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38 if link and link.attr.href and link.attr.href ~= content then
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39 summary = (summary and summary .. "\n" or "") .. link.attr.href;
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40 end
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41 return summary;
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42 end, 1);