hexo scaffold的创建过程

layout从哪边来

new.js

var data = {
   title: args._.pop(),//标题
   layout: args._.length ? args._[0] : this.config.default_layout,
   slug: args.s || args.slug,
   path: args.p || args.path
 };

 ...省略
  return this.post.create(data, args.r || args.replace).then(function(post){
   self.log.info('Created: %s', chalk.magenta(tildify(post.path)));
 });

post.js

//默认layout为post
data.layout = (data.layout || config.default_layout).toLowerCase();

...省略
this._getScaffold(data.layout)

...省略
Post.prototype._getScaffold = function(layout){
var ctx = this.context;

//从scaffold目录中获取post.md
return ctx.scaffold.get(layout).then(function(result){
    if (result != null) return result;
    return ctx.scaffold.get('normal');
  });
};

hexo-front-matter/front_matter.js

 var split = yfm.split(scaffold);

 ...省略
 var rPrefixSep = /^(-{3,}|;{3,})/;
 var rFrontMatter = /^(-{3,}|;{3,})\n([\s\S]+?)\n\1(?:$|\n([\s\S]*)$)/;
 var rFrontMatterNew = /^([\s\S]+?)\n(-{3,}|;{3,})(?:$|\n([\s\S]*)$)/;

 ...省略
 function split(str){
  if (typeof str !== 'string') throw new TypeError('str is required!');
  console.log(str);
  if (rFrontMatter.test(str)) return splitOld(str);

  //post.md中默认内容 匹配rFrontMatterNew
  if (rFrontMatterNew.test(str)) return splitNew(str);

  return {content: str};
}

function splitNew(str){
  console.log('splitNew');
  if (rPrefixSep.test(str)) return {content: str};

  var match = str.match(rFrontMatterNew);

  return {
    data: match[1],
    content: match[3] || '',
    separator: match[2],
    prefixSeparator: false
  };
}

var frontMatter = prepareFrontMatter(_.clone(data));

...省略
function prepareFrontMatter(data){
 var keys = Object.keys(data);
 var key = '';
 var item;

 for (var i = 0, len = keys.length; i < len; i++){
   key = keys[i];
   item = data[key];
//时间格式化
   if (moment.isMoment(item)){
     data[key] = item.utc().format('YYYY-MM-DD HH:mm:ss');
   } else if (moment.isDate(item)){
     data[key] = moment.utc(item).format('YYYY-MM-DD HH:mm:ss');
   } else if (typeof item === 'string'){
     data[key] = '"' + item + '"';
   }
 }

 return data;
}

最后调用 swig模板引擎 编译splitedata对象

 var renderedData = swig.compile(split.data)(frontMatter);

this.compile = function (source, options) {
    var key = options ? options.filename : null,
      cached = key ? cacheGet(key, options) : null,
      context,
      contextLength,
      pre;

    if (cached) {
      return cached;
    }

    context = getLocals(options);
    contextLength = utils.keys(context).length;
    pre = this.precompile(source, options);

    function compiled(locals) {
      var lcls;
      if (locals && contextLength) {
        lcls = utils.extend({}, context, locals);
      } else if (locals && !contextLength) {
        lcls = locals;
      } else if (!locals && contextLength) {
        lcls = context;
      } else {
        lcls = {};
      }
      return pre.tpl(self, lcls, filters, utils, efn);
    }

    utils.extend(compiled, pre.tokens);

    if (key) {
      cacheSet(key, options, compiled);
    }

    return compiled;
 };