feat(feed_tag): support parsing config.feed

lib/plugins/helper/feed_tag.js

@@ -1,9 +1,36 @@
 'use strict';
 
 function feedTagHelper(path, options = {}) {
-  const title = options.title || this.config.title;
+  const { config } = this;
+  const title = options.title || config.title;
+  const { feed } = config;
 
-  return `<link rel="alternate" href="${this.url_for(path)}" title="${title}">`;
+  if (path) {
+    if (typeof path !== 'string') throw new TypeError('path must be a string!');
+    const { type } = options;
+    let typeAttr = '';
+
+    if (type === 'atom' || path.includes('atom')) typeAttr = 'type="application/atom+xml"';
+    else if (type.includes('rss') || path.includes('rss')) typeAttr = 'type="application/rss+xml"';
+
+    return `<link rel="alternate" href="${this.url_for(path)}" title="${title}" ${typeAttr}>`;
+  }
+
+  if (!path && feed) {
+    if (feed.type && feed.path) {
+      if (typeof feed.type === 'string') {
+        return `<link rel="alternate" href="${this.url_for(feed.path)}" title="${title}" type="application/${feed.type.replace(/2$/, '')}+xml">`;
+      }
+
+      let result = '';
+      for (const i in feed.type) {
+        result += `<link rel="alternate" href="${this.url_for(feed.path[i])}" title="${title}" type="application/${feed.type[i].replace(/2$/, '')}+xml">`;
+      }
+      return result;
+    }
+  }
+
+  return '';
 }
 
 module.exports = feedTagHelper;

test/scripts/helpers/feed_tag.js

@@ -1,26 +1,86 @@
 'use strict';
 
 describe('feed_tag', () => {
-  const Hexo = require('../../../lib/hexo');
-  const hexo = new Hexo(__dirname);
-
   const ctx = {
-    config: hexo.config
+    config: {
+      title: 'Hexo',
+      url: 'http://yoursite.com',
+      root: '/',
+      feed: {}
+    }
   };
 
+  beforeEach(() => { ctx.config.feed = {}; });
+
   ctx.url_for = require('../../../lib/plugins/helper/url_for').bind(ctx);
 
   const feed = require('../../../lib/plugins/helper/feed_tag').bind(ctx);
 
   it('path', () => {
-    feed('atom.xml').should.eql('<link rel="alternate" href="/atom.xml" title="Hexo">');
+    feed('atom.xml').should.eql('<link rel="alternate" href="/atom.xml" title="Hexo" type="application/atom+xml">');
   });
 
   it('title', () => {
-    feed('atom.xml', {title: 'RSS Feed'}).should.eql('<link rel="alternate" href="/atom.xml" title="RSS Feed">');
+    feed('atom.xml', {title: 'RSS Feed'}).should.eql('<link rel="alternate" href="/atom.xml" title="RSS Feed" type="application/atom+xml">');
   });
 
   it('type', () => {
-    feed('rss.xml', {type: 'rss'}).should.eql('<link rel="alternate" href="/rss.xml" title="Hexo">');
+    feed('rss.xml', {type: 'rss'}).should.eql('<link rel="alternate" href="/rss.xml" title="Hexo" type="application/rss+xml">');
+  });
+
+  it('invalid input - number', () => {
+    try {
+      feed(123);
+    } catch (err) {
+      err.message.should.eql('path must be a string!');
+    }
+  });
+
+  it('invalid input - undefined', () => {
+    ctx.config.feed = {};
+    const result = feed();
+    const typeOf = str => typeof str;
+
+    typeOf(result).should.eql('string');
+    result.length.should.eql(0);
+  });
+
+  it('feed - parse argument if available', () => {
+    ctx.config.feed = {
+      type: 'atom',
+      path: 'atom.xml'
+    };
+
+    feed('atomic.xml').should.eql('<link rel="alternate" href="/atomic.xml" title="Hexo" type="application/atom+xml">');
+  });
+
+  it('feed - atom', () => {
+    ctx.config.feed = {
+      type: 'atom',
+      path: 'atom.xml'
+    };
+
+    feed().should.eql('<link rel="alternate" href="/atom.xml" title="Hexo" type="application/atom+xml">');
+  });
+
+  it('feed - rss2', () => {
+    ctx.config.feed = {
+      type: 'rss2',
+      path: 'rss.xml'
+    };
+
+    feed().should.eql('<link rel="alternate" href="/rss.xml" title="Hexo" type="application/rss+xml">');
+  });
+
+  it('feed - rss2', () => {
+    ctx.config.feed = {
+      type: ['atom', 'rss2'],
+      path: ['atom.xml', 'rss.xml']
+    };
+
+    feed().should.eql([
+      '<link rel="alternate" href="/atom.xml" title="Hexo" type="application/atom+xml">',
+      '<link rel="alternate" href="/rss.xml" title="Hexo" type="application/rss+xml">'
+    ].join(''));
   });
 });