67 lines
1.4 KiB
JavaScript
67 lines
1.4 KiB
JavaScript
var util = require("./util");
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var path = require("path");
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var api = require("./node");
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var fs = require("fs");
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var _ = require("lodash");
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module.exports = function (opts) {
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opts = _.defaults(opts || {}, {
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src: "assets",
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dest: "cache"
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});
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var cache = {};
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return function (req, res, next) {
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var url = req.url;
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if (!util.canCompile(url)) return next();
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var dest = path.join(opts.dest, url);
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var src = path.join(opts.src, url);
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var write = function (transformed) {
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fs.writeFile(dest, transformed, function (err) {
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if (err) {
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next(err);
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} else {
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cache[url] = Date.now();
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next();
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}
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});
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};
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var compile = function () {
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var transformOpts = _.clone(opts.transform || {});
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api.transformFile(opts.dest, transformOpts, function (err, transformed) {
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if (err) return next(err);
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write(transformed);
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});
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};
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var destExists = function () {
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fs.stat(dest, function (err, stat) {
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if (err) return next(err);
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if (cache[url] < +stat.mtime) {
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compile();
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} else {
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next();
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}
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});
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};
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fs.exists(src, function (exists) {
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if (!exists) return next();
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fs.exists(dest, function (exists) {
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if (exists && cache[dest]) {
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destExists();
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} else {
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compile();
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}
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});
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});
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};
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};
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