Refactor. Update dependencies. Update tests. Make img plugin async.

lib/link-less.js

@@ -0,0 +1,58 @@
+const co = require('co');
+const fs = require('mz/fs');
+const isLocalPath = require('is-local-path');
+const less = require('less');
+const path = require('path');
+const R = require('ramda');
+const Ru = require('@panosoft/ramda-utils');
+
+const forEachIndexed = R.addIndex(R.forEach);
+const resolve = R.curry((a,b) => path.resolve(a,b));
+
+const render = R.curryN(2, co.wrap(function * (options, filename) {
+	options = R.merge(options || {}, { filename });
+	const contents = yield fs.readFile(filename, 'utf8');
+	return yield less.render(contents, options);
+}));
+/**
+ * Inline linked less files
+ *
+ * @param {Object} $
+ * 	Parsed HTML source to inline
+ * @param {String} filename
+ * 	Filename to apply to the HTML source being inlined
+ * @param {Object} [options]
+ * @param {Object} [options.less]
+ * 	LESS compiler options
+ */
+const inlineLess = co.wrap(function * ($, filename, options) {
+	options = Ru.defaults({ less: {} }, options || {});
+	options = Ru.defaults({ relativeUrls: true }, options.less);
+	var files = [];
+	const basedir = path.dirname(filename);
+	const getAttr = R.curry((attr, element) => $(element).attr(attr));
+	const getStylesheet = R.pipe(getAttr('href'), resolve(basedir));
+	try {
+		const links = $('link[rel="stylesheet/less"]')
+			.filter((index, link) => isLocalPath($(link).attr('href')))
+			.toArray();
+
+		const stylesheets = R.map(getStylesheet, links);
+		files = R.concat(files, stylesheets);
+		const outputs = yield R.map(render(options), stylesheets);
+		const imports = R.flatten(R.map(R.prop('imports'), outputs));
+		files = R.concat(files, imports);
+		const styles = R.map(output => $('<style>').html(output.css), outputs);
+
+		forEachIndexed((link, index) => $(link).replaceWith(styles[index]), links);
+
+		files = R.uniq(files);
+		return { $, files };
+	}
+	catch (error) {
+		if (!error.filename) error.filename = filename;
+		error.files = R.uniq(files);
+		throw error;
+	}
+});
+module.exports = inlineLess;