mort
/
pipic


			
				
					
						
						
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							var fs = require("fs");
var pathlib = require("path");
var marked = require("marked");

var mimetype = require("./mimetype");
var error = require("./error");

module.exports = Slideshow;

marked.setOptions({
	sanitize: true
});

var htmlPre =
	"<html>"+
	"<head>"+
	"<link rel='stylesheet' href='/slide.css'>"+
	"<meta charset='utf-8'>"+
	"</head>"+
	"<body>"+
	"<div id='_wrapper'>";

var htmlPost =
	"<script src='/slide.js'></script>"+
	"</div>"+
	"</body>"+
	"</html>";

function sendFile(path, res) {
	res.writeHead(200, {
		"content-type": mimetype(path)
	});

	fs.createReadStream(path)
		.on("error", err => {
			res.writeHead(404);
			res.end(err.toString());
		})
		.pipe(res);
}

function sendIndex(html, res) {
	res.writeHead(200, {
		"content-type": "text/html"
	});
	res.write(htmlPre);
	res.write(html);
	res.end(htmlPost);
}

// The individual slide
function Slide(dir) {
	var self = {};

	self.dir = dir;
	self.name = pathlib.parse(dir).name;
	self.stat = null;
	self.html = "";

	self.sendIndex = function(res) {
		var path = pathlib.join(self.dir, "index.md");

		fs.stat(pathlib.join(self.dir, "index.md"), (err, stat) => {
			if (err) {
				sendIndex("", res);
				console.log(err);
				return;
			}

			if (!self.stat || !stat || self.stat.mtime !== stat.mtime) {
				fs.readFile(path, "utf-8", (err, md) => {
					if (err) {
						sendIndex(err);
						console.log(err);
						return;
					}

					self.html = marked(md);
					sendIndex(self.html, res);
				});
			} else {
				sendIndex(self.html, res);
			}

			self.stat = stat;
		});
	}

	self.sendFile = function(name, res) {
		sendFile(self.html, res);
	}

	self.serveFiles = function(parts, res) {

		// Serve index if /{name} is requested
		if (parts.pathname.replace(/\//g, "") === self.name) {

			// Redirect from /{name} to /{name}/
			if (parts.pathname[parts.pathname.length - 1] !== '/') {
				res.writeHead(302, {
					location: parts.pathname+"/"
				});
				res.end();

				// Serve index if it's already /{name}/
			} else {
				self.sendIndex(res);
			}
		} else {

			// Serve other files
			var name = parts.pathname.substring(1).replace(self.name, "");
			var path = pathlib.join(dir, name);
			sendFile(path, res);
		}
	}

	self.indexExists = function() {
		try {
			fs.accessSync(pathlib.join(dir, "index.md"));
			return true;
		} catch (err) {
			return false;
		}
	}

	try {
		self.meta = JSON.parse(
			fs.readFileSync(pathlib.join(dir, "meta.json")));
	} catch (err) {
		if (err.code !== "ENOENT")
			error(err);

		self.meta = {};
	}

	return self;
}

// The slideshow, whose job it is to manage all slides
// and tell the client whether it has to update or not
function Slideshow(dir, changeInterval) {
	var self = {};

	var currentSlide = null;
	var awaiters = [];
	var slides = [];
	var slideIndex = 0;
	var nextTimeout;

	self.sendEvent = function(evt, args) {
		var str = JSON.stringify({ evt: evt, args: args });
		awaiters.forEach(res => res.end(str));
		awaiters = [];
	}

	// Get the current slide's interval
	function currentInterval() {
		var itv = currentSlide.meta.interval;
		if (itv === undefined)
			itv = changeInterval;
		return itv;
	}

	// Return if the current slide is enabled and valid
	function currentEnabled() {
		return currentSlide.indexExists() && !currentSlide.meta.disabled;
	}

	self.getSlideName = getSlideName;
	function getSlideName() {
		return currentSlide ? currentSlide.name : ""
	}

	self.pushAwaiter = pushAwaiter;
	function pushAwaiter(res) {
		awaiters.push(res);
	}

	self.getSlides = getSlides;
	function getSlides() {
		return slides;
	}

	self.next = next;
	function next() {
		slideIndex += 1;

		// Go to the next slide, or restart
		if (slideIndex >= slides.length) {
			clearTimeout(nextTimeout);
			init();
		} else {
			currentSlide = slides[slideIndex];

			nextTimeout = setTimeout(next, currentInterval());
		}

		// End all awaiting connections to notify slide change,
		if (currentEnabled()) {
			self.sendEvent("next", { name: currentSlide.name });

		// Or go to the next slide if the current one doesn't have an index.html
		// or if the slide is disabled
		} else {
			clearTimeout(nextTimeout);
			setTimeout(next, 0);
		}
	}

	self.updateSlides = updateSlides;
	function updateSlides() {
		slides = fs.readdirSync(dir)
			.sort()
			.map(file => Slide(pathlib.join(dir, file)));
	}

	self.serve = serve;
	function serve(parts, res) {
		for (var slide of slides) {
			if (slide.name === parts.pathname.substr(1, slide.name.length)) {
				slide.serveFiles(parts, res);
				return;
			}
		}

		// We haven't found any matching slides
		res.writeHead(404);
		res.end("404");
	}

	// This function starts the slideshow and goes through the slides
	// one by one. When done, it starts again by calling this function again.
	function init() {
		updateSlides();

		slideIndex = 0;
		currentSlide = slides[slideIndex];

		nextTimeout = setTimeout(next, currentInterval());
	}
	init();

	return self;
}