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annotate mod_latex/mod_latex.lua @ 5608:1893ae742f66

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mod_http_oauth2: Show errors on device flow user code entry page If the user enters the code incorrectly, having to click back to try again is no fun. Instead, show the error and the code entry form again.
author Kim Alvefur <zash@zash.se>
date Wed, 19 Jul 2023 13:05:47 +0200
parents df8da7e4c2bf
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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e190c1643a8f mod_latex: New (well, kind of) module for rendering LaTeX in messages and replacing with a rendered embedded image
Matthew Wild <mwild1@gmail.com>
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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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6
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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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df8da7e4c2bf mod_latex: Log debug message when actually deciding to do LaTeX replacing
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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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29
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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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parents:
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38 if tag.name == "html" and tag.attr.xmlns == xmlns_xhtmlim then
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parents:
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39 stanza.tags[n] = html;
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parents:
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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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parents:
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42 stanza[n] = html;
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43 end
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Matthew Wild <mwild1@gmail.com>
parents:
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44 end
e190c1643a8f mod_latex: New (well, kind of) module for rendering LaTeX in messages and replacing with a rendered embedded image
Matthew Wild <mwild1@gmail.com>
parents:
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45 return;
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Matthew Wild <mwild1@gmail.com>
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46 end
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Matthew Wild <mwild1@gmail.com>
parents:
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47 end
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48
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parents:
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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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Matthew Wild <mwild1@gmail.com>
parents:
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52
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Matthew Wild <mwild1@gmail.com>
parents:
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53 module:hook("message/bare", replace_latex, 30);
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parents:
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54 module:hook("message/full", replace_latex, 30);