feature:

文章分类功能

lib/notion.js

@@ -1,3 +1,4 @@
 export { getAllPosts } from './notion/getAllPosts'
 export { getAllTags } from './notion/getAllTags'
 export { getPostBlocks } from './notion/getPostBlocks'
+export { getAllCategories } from './notion/getAllCategories'

lib/notion/getAllCategories.js

@@ -0,0 +1,22 @@
+/**
+ * 获取所有文章的分类
+ * @param allPosts
+ * @returns {Promise<{}|*[]>}
+ */
+export async function getAllCategories (allPosts) {
+  if (!allPosts) {
+    return []
+  }
+
+  let categories = allPosts.map(p => p.category)
+  categories = [...categories.flat()]
+  const categoryObj = {}
+  categories.forEach(category => {
+    if (category in categoryObj) {
+      categoryObj[category]++
+    } else {
+      categoryObj[category] = 1
+    }
+  })
+  return categoryObj
+}