fd-gulp-less/index.js

convert less file to css

var less = require('less');
var through2 = require('through2');
var gutil = require('gulp-util');
var PluginError = gutil.PluginError;
var path = require('path');
var constants = require('./assets/constants');
var iconv = require('iconv-lite');

module.exports = function (srcDir, options) {
	
	function transform (file, enc, callback) {
		var self = this;
		
		if (file.isNull()) return; 
		if (file.isStream()) return this.emit('error', new PluginError(constants.PLUGIN_NAME,  'STYLE_BUILD_ERR: Streaming not supported'));

		//是否有跳过编译选项，如果没有，则进行编译
		if(!constants.EXCEPT_COMPIRE_FLAG.test(file.contents)){
				var fileContent = iconv.decode(file.contents, 'GBK');
				var opts = options || {};
				opts.filename = file.path;
				
				less.render(fileContent, opts, function (err, css) {
					  if (err) {
							err.lineNumber = err.line;
							err.fileName = err.filename;
							err.message = err.message + ' in file ' + err.fileName + ' line no. ' + err.lineNumber;
							self.emit('error', new PluginError('fd-gulp-less', err));
					  } else {
							file.contents = iconv.encode(css, 'GBK');
							file.path = gutil.replaceExtension(file.path, '.css');
							self.push(file);
							callback();
					  }
				});
		}else{
			self.push(file);
			callback();
		}
	}
	return through2.obj(transform);

};