adrdox.latex source code

1 module adrdox.latex;
2 
3 import std.process;
4 import std.file;
5 
6 import arsd.dom;
7 
8 string makeDataUrl(string mimeType, in void[] data) {
9     import std.base64;
10 	auto data64 = Base64.encode(cast(const(ubyte[])) data);
11 	return "data:" ~ mimeType ~ ";base64," ~ cast(string)(data64);
12 }
13 
14 // requires latex and dvipng to be installed on your system already, it just
15 // calls out to them in the shell
16 Element mathToImgHtml(string mathCode) {
17 
18 	string dir = tempDir;
19 
20 	// FIXME: this should prolly be unique or somethign
21 	string filebase = "./adrdox";
22 
23 	std.file.write(dir ~ "/" ~ filebase ~ ".latex", 
24 `\documentclass{article}
25 \usepackage{amsmath}
26 \usepackage{amsfonts}
27 \usepackage{amssymb}
28 \pagestyle{empty}
29 \begin{document}
30 $ `~mathCode~` $
31 \end{document}`
32 	);
33 
34 	auto tpl = executeShell(
35 		"latex -interaction=nonstopmode " ~ filebase ~ ".latex"
36 		~ " && " ~
37 		"dvipng -T tight -D 200 -o "~filebase~".png -bg Transparent "~filebase~".dvi -z 9",
38 		null, Config.none, size_t.max, dir
39 	);
40 
41 	if(tpl.status != 0)
42 		return null;
43 
44 
45 	auto prefix = dir ~ "/" ~ filebase;
46 	if(exists(prefix ~ ".aux"))
47 		remove(prefix ~ ".aux");
48 	if(exists(prefix ~ ".dvi"))
49 		remove(prefix ~ ".dvi");
50 	if(exists(prefix ~ ".latex"))
51 		remove(prefix ~ ".latex");
52 	if(exists(prefix ~ ".log"))
53 		remove(prefix ~ ".log");
54 
55 	if(exists(prefix ~ ".png")) {
56 		auto file = read(prefix ~ ".png");
57 		remove(prefix ~ ".png");
58 
59 		auto img = Element.make("img");
60 		img.alt = mathCode;
61 		img.src = makeDataUrl("image/png", file);
62 		img.className = "rendered-math";
63 		return img;
64 	}
65 
66 	return null;
67 
68 }