fix: generation fail with no tags #1

lib/generators/tag.js

@@ -1,35 +1,34 @@
-const pagination = require('hexo-pagination')
-const {
-  tagMapper,
-  tagPageMapper,
-  postListMapper
-} = require('../helpers/mapper')
+const pagination = require('hexo-pagination');
+const { tagMapper, tagPageMapper, postListMapper } = require('../helpers/mapper');
 
 class TagGenerator {
-  data = []
-  posts = []
-  configs = {}
+  data = [];
+  posts = [];
+  configs = {};
 
   constructor(tags, posts, configs) {
-    this.data = tags
-    this.posts = posts
-    this.configs = configs
-    this.reduceTags()
-    for(let cat of this.data) {
-      cat.data.postlist.sort(function (a, b) {
-        return a.date< b.date? 1 : -1;
-      })
+    this.data = tags ?? [];
+    this.posts = posts;
+    this.configs = configs;
+
+    if (this.data.length < 1) return;
+
+    this.reduceTags();
+    for (let tag of this.data) {
+      tag.data.postlist.sort(function (a, b) {
+        return a.date < b.date ? 1 : -1;
+      });
     }
   }
 
   reduceTags() {
-    if (this.count() <= 0) return
-    const tags = this.data
-    const posts = this.posts
-    const configs = this.configs
+    if (this.count() <= 0) return;
+    const tags = this.data;
+    const posts = this.posts;
+    const configs = this.configs;
 
     this.data = tags.reduce(function (result, item) {
-      if (!item.length) return result
+      if (!item.length) return result;
 
       return result.concat(
         pagination(item.path, posts, {
@@ -40,34 +39,34 @@ class TagGenerator {
             count: item.posts.length,
             path: 'api/tags/' + item.slug + '.json',
             postlist: item.posts.map((post) => {
-              return postListMapper(post, configs)
+              return postListMapper(post, configs);
             })
           }
         })
-      )
-    }, [])
+      );
+    }, []);
   }
 
   addTags(data) {
-    if (this.count <= 0) {
+    if (this.count() <= 0) {
       data.push({
         path: 'api/tags.json',
         data: JSON.stringify([])
-      })
+      });
     } else {
       data.push({
         path: 'api/tags.json',
         data: JSON.stringify(this.data.map(tagMapper))
-      })
-      data = data.concat(this.data.map(tagPageMapper))
+      });
+      data = data.concat(this.data.map(tagPageMapper));
     }
 
-    return data
+    return data;
   }
 
   count() {
-    return this.data.length
+    return this.data.length;
   }
 }
 
-module.exports = TagGenerator
+module.exports = TagGenerator;