File

mod_latex/mod_latex.lua @ 5516:f25df3af02c1

mod_client_management: Include client software version number in listing Should you ever wish to revoke a client by version number, e.g. for security reasons affecting certain versions, then it would be good to at the very least see which version is used. Also includes the OAuth2 software ID, an optional unique identifier that should be the same for all installations of a particular software.
author Kim Alvefur <zash@zash.se>
date Sat, 03 Jun 2023 19:21:39 +0200
parent 1433:df8da7e4c2bf
line wrap: on
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local st = require "stanza";
local urlencode = require "net.http".urlencode;

local xmlns_xhtmlim = "http://jabber.org/protocol/xhtml-im";
local xmlns_xhtml = "http://www.w3.org/1999/xhtml";

local function replace_latex(data)
	local origin, stanza = data.origin, data.stanza;
	local body = stanza:get_child_text("body");
	if not body or not body:match("%$%$") then
		return;
	end
	module:log("debug", "Replacing latex...");

	local html = st.stanza("html", { xmlns = xmlns_xhtmlim })
		:tag("body", { xmlns = xmlns_xhtml });

	local in_latex, last_char;
	for snippet, up_to in body:gmatch("(.-)%$%$()") do
		last_char = up_to;
		if in_latex then
			-- Render latex and add image, next snippet is text
			in_latex = nil;
			html:tag("img", { src = "http://www.mathtran.org/cgi-bin/mathtran?D=2;tex="..urlencode(snippet), alt = snippet }):up();
		else
			-- Add text to HTML, next snippet is latex
			in_latex = true;
			html:tag("span"):text(snippet):up();

		end
	end
	if last_char < #body then
		html:tag("span"):text(body:sub(last_char, #body)):up();
	end

	for n, tag in ipairs(stanza.tags) do
		module:log("debug", "Tag: %s|%s", tag.attr.xmlns or "", tag.name or "");
		if tag.name == "html" and tag.attr.xmlns == xmlns_xhtmlim then
			stanza.tags[n] = html;
			for n, child in ipairs(stanza) do
				if child == tag then
					stanza[n] = html;
				end
			end
			return;
		end
	end

	stanza[#stanza+1] = html;
	stanza.tags[#stanza.tags+1] = html;
end

module:hook("message/bare", replace_latex, 30);
module:hook("message/full", replace_latex, 30);