grunt-jadeでjade名と同名のjsonファイルを読み込む関数

Gruntfile.js

function jadeDataFunc(env){

		return function(dest, srcAr){ //dest が生成するhtml、srcが参照元jadeファイル
			var _ = grunt.util._,
				regDest = /\/([A-Za-z_0-9-]+?)\.html/,
				destName = dest.match(regDest)[1],
				dataPath = "src/jade/json/" + destName + ".json",
				mergeData,
				data;
			try {
				mergeData = grunt.file.readJSON("src/jade/json/_common.json");
			} catch(e){
				mergeData = {};
			}
			mergeData = _.clone(mergeData);
				
			try {
				data = grunt.file.readJSON(dataPath);
			} catch(e){
				data = {};
			}
			_.extend(mergeData.pc, data.pc || {});
			_.extend(mergeData.sp, data.sp || {});
			_.extend(mergeData.common, data.common || {});

			return _.extend(mergeData, {
				env:env,
				page:destName
			});
		};
	}