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112 lines
3.1 KiB
112 lines
3.1 KiB
/*
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* grunt-contrib-less
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* http://gruntjs.com/
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*
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* Copyright (c) 2012 Tyler Kellen, contributors
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* Licensed under the MIT license.
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*/
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'use strict';
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module.exports = function(grunt) {
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var path = require('path');
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var less = require('less');
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var lessOptions = {
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parse: ['paths', 'optimization', 'filename', 'strictImports', 'dumpLineNumbers'],
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render: ['compress', 'yuicompress']
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};
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grunt.registerMultiTask('less', 'Compile LESS files to CSS', function() {
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var done = this.async();
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var options = this.options();
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grunt.verbose.writeflags(options, 'Options');
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if (this.files.length < 1) {
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grunt.log.warn('Destination not written because no source files were provided.');
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}
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grunt.util.async.forEachSeries(this.files, function(f, nextFileObj) {
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var destFile = f.dest;
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var files = f.src.filter(function(filepath) {
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// Warn on and remove invalid source files (if nonull was set).
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if (!grunt.file.exists(filepath)) {
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grunt.log.warn('Source file "' + filepath + '" not found.');
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return false;
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} else {
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return true;
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}
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});
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if (files.length === 0) {
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if (f.src.length < 1) {
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grunt.log.warn('Destination not written because no source files were found.');
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}
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// No src files, goto next target. Warn would have been issued above.
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return nextFileObj();
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}
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var compiled = [];
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grunt.util.async.concatSeries(files, function(file, next) {
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compileLess(file, options, function(css, err) {
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if (!err) {
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compiled.push(css);
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next();
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} else {
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nextFileObj(false);
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}
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});
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}, function() {
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if (compiled.length < 1) {
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grunt.log.warn('Destination not written because compiled files were empty.');
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} else {
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grunt.file.write(destFile, compiled.join(grunt.util.normalizelf(grunt.util.linefeed)));
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grunt.log.writeln('File ' + destFile.cyan + ' created.');
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}
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nextFileObj();
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});
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}, done);
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});
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var compileLess = function(srcFile, options, callback) {
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options = grunt.util._.extend({filename: srcFile}, options);
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options.paths = options.paths || [path.dirname(srcFile)];
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var css;
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var srcCode = grunt.file.read(srcFile);
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var parser = new less.Parser(grunt.util._.pick(options, lessOptions.parse));
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parser.parse(srcCode, function(parse_err, tree) {
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if (parse_err) {
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lessError(parse_err);
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callback('',true);
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}
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try {
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css = tree.toCSS(grunt.util._.pick(options, lessOptions.render));
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callback(css, null);
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} catch (e) {
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lessError(e);
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callback(css, true);
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}
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});
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};
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var formatLessError = function(e) {
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var pos = '[' + 'L' + e.line + ':' + ('C' + e.column) + ']';
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return e.filename + ': ' + pos + ' ' + e.message;
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};
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var lessError = function(e) {
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var message = less.formatError ? less.formatError(e) : formatLessError(e);
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grunt.log.error(message);
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grunt.fail.warn('Error compiling LESS.');
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};
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};
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