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node_modules/hexo-pagination/lib/pagination.js

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+'use strict';
+
+const { format } = require('util');
+
+function pagination(base, posts, options = {}) {
+  if (typeof base !== 'string') throw new TypeError('base must be a string!');
+  if (!posts) throw new TypeError('posts is required!');
+
+  if (base && !base.endsWith('/')) base += '/';
+
+  const { length } = posts;
+
+  const { format: _format, layout, data, perPage } = Object.assign({
+    format: 'page/%d/',
+    layout: ['archive', 'index'],
+    data: {},
+    perPage: 10
+  }, options);
+
+  const total = perPage ? Math.ceil(length / perPage) : 1;
+  const result = [];
+  const urlCache = new Map();
+
+  function formatURL(i) {
+    if (urlCache.has(i)) return urlCache.get(i);
+
+    const url = i > 1 ? base + format(_format, i) : base;
+    urlCache.set(i, url);
+
+    return url;
+  }
+
+  function makeData(i) {
+    const data = {
+      base,
+      total,
+      current: i,
+      current_url: formatURL(i),
+      posts: perPage ? posts.slice(perPage * (i - 1), perPage * i) : posts,
+      prev: 0,
+      prev_link: '',
+      next: 0,
+      next_link: ''
+    };
+
+    if (i > 1) {
+      data.prev = i - 1;
+      data.prev_link = formatURL(data.prev);
+    }
+
+    if (i < total) {
+      data.next = i + 1;
+      data.next_link = formatURL(data.next);
+    }
+
+    return data;
+  }
+
+  if (perPage) {
+    for (let i = 1; i <= total; i++) {
+      result.push({
+        path: formatURL(i),
+        layout,
+        data: Object.assign(makeData(i), data)
+      });
+    }
+  } else {
+    result.push({
+      path: base,
+      layout,
+      data: Object.assign(makeData(1), data)
+    });
+  }
+
+  return result;
+}
+
+module.exports = pagination;