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annotate mod_latex/mod_latex.lua @ 4646:072d078be095

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mod_storage_xmlarchive: Advertise capabilities (none atm) Both 'total' and 'quota' would be prohibitively expensive for the kind of archives this module targets as it would require counting items across the entire archive.
author Kim Alvefur <zash@zash.se>
date Fri, 13 Aug 2021 01:18:32 +0200
parents df8da7e4c2bf
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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e190c1643a8f mod_latex: New (well, kind of) module for rendering LaTeX in messages and replacing with a rendered embedded image
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1 local st = require "stanza";
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2 local urlencode = require "net.http".urlencode;
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3
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4 local xmlns_xhtmlim = "http://jabber.org/protocol/xhtml-im";
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5 local xmlns_xhtml = "http://www.w3.org/1999/xhtml";
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7 local function replace_latex(data)
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8 local origin, stanza = data.origin, data.stanza;
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9 local body = stanza:get_child_text("body");
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10 if not body or not body:match("%$%$") then
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11 return;
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12 end
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13 module:log("debug", "Replacing latex...");
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14
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15 local html = st.stanza("html", { xmlns = xmlns_xhtmlim })
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16 :tag("body", { xmlns = xmlns_xhtml });
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17
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18 local in_latex, last_char;
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19 for snippet, up_to in body:gmatch("(.-)%$%$()") do
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20 last_char = up_to;
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21 if in_latex then
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22 -- Render latex and add image, next snippet is text
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23 in_latex = nil;
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24 html:tag("img", { src = "http://www.mathtran.org/cgi-bin/mathtran?D=2;tex="..urlencode(snippet), alt = snippet }):up();
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25 else
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26 -- Add text to HTML, next snippet is latex
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27 in_latex = true;
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28 html:tag("span"):text(snippet):up();
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30 end
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31 end
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32 if last_char < #body then
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33 html:tag("span"):text(body:sub(last_char, #body)):up();
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34 end
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35
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36 for n, tag in ipairs(stanza.tags) do
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37 module:log("debug", "Tag: %s|%s", tag.attr.xmlns or "", tag.name or "");
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38 if tag.name == "html" and tag.attr.xmlns == xmlns_xhtmlim then
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39 stanza.tags[n] = html;
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40 for n, child in ipairs(stanza) do
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parents:
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41 if child == tag then
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42 stanza[n] = html;
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43 end
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44 end
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Matthew Wild <mwild1@gmail.com>
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45 return;
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46 end
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47 end
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48
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49 stanza[#stanza+1] = html;
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50 stanza.tags[#stanza.tags+1] = html;
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51 end
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53 module:hook("message/bare", replace_latex, 30);
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54 module:hook("message/full", replace_latex, 30);