/* * grunt-contrib-less * http://gruntjs.com/ * * Copyright (c) 2013 Tyler Kellen, contributors * Licensed under the MIT license. */ 'use strict'; module.exports = function(grunt) { // Internal lib. var contrib = require('grunt-lib-contrib').init(grunt); var path = require('path'); var less = require('less'); var lessOptions = { parse: ['paths', 'optimization', 'filename', 'strictImports', 'syncImport', 'dumpLineNumbers', 'relativeUrls', 'rootpath'], render: ['compress', 'yuicompress', 'ieCompat', 'strictMath'] }; grunt.registerMultiTask('less', 'Compile LESS files to CSS', function() { var done = this.async(); var options = this.options(); grunt.verbose.writeflags(options, 'Options'); if (this.files.length < 1) { grunt.verbose.warn('Destination not written because no source files were provided.'); } grunt.util.async.forEachSeries(this.files, function(f, nextFileObj) { var destFile = f.dest; var files = f.src.filter(function(filepath) { // Warn on and remove invalid source files (if nonull was set). if (!grunt.file.exists(filepath)) { grunt.log.warn('Source file "' + filepath + '" not found.'); return false; } else { return true; } }); if (files.length === 0) { if (f.src.length < 1) { grunt.log.warn('Destination not written because no source files were found.'); } // No src files, goto next target. Warn would have been issued above. return nextFileObj(); } var compiledMax = [], compiledMin = []; grunt.util.async.concatSeries(files, function(file, next) { compileLess(file, options, function(css, err) { if (!err) { if (css.max) { compiledMax.push(css.max); } compiledMin.push(css.min); next(); } else { nextFileObj(err); } }); }, function() { if (compiledMin.length < 1) { grunt.log.warn('Destination not written because compiled files were empty.'); } else { var min = compiledMin.join(options.yuicompress ? '' : grunt.util.normalizelf(grunt.util.linefeed)); grunt.file.write(destFile, min); grunt.log.writeln('File ' + destFile.cyan + ' created.'); // ...and report some size information. if (options.report) { contrib.minMaxInfo(min, compiledMax.join(grunt.util.normalizelf(grunt.util.linefeed)), options.report); } } nextFileObj(); }); }, done); }); var compileLess = function(srcFile, options, callback) { options = grunt.util._.extend({filename: srcFile}, options); options.paths = options.paths || [path.dirname(srcFile)]; var css; var srcCode = grunt.file.read(srcFile); var parser = new less.Parser(grunt.util._.pick(options, lessOptions.parse)); parser.parse(srcCode, function(parse_err, tree) { if (parse_err) { lessError(parse_err); callback('',true); } try { css = minify(tree, grunt.util._.pick(options, lessOptions.render)); callback(css, null); } catch (e) { lessError(e); callback(css, true); } }); }; var formatLessError = function(e) { var pos = '[' + 'L' + e.line + ':' + ('C' + e.column) + ']'; return e.filename + ': ' + pos + ' ' + e.message; }; var lessError = function(e) { var message = less.formatError ? less.formatError(e) : formatLessError(e); grunt.log.error(message); grunt.fail.warn('Error compiling LESS.'); }; var minify = function (tree, options) { var result = { min: tree.toCSS(options) }; if (!grunt.util._.isEmpty(options)) { result.max = tree.toCSS(); } return result; }; };