feat(search): add pathNamespaces option

This option allows to dynamically choose the index path depending on the path prefixes in auto mode. Thus, different path namespace could avoid index intersection (e.g., when having multiple locales)

docs/plugins.md

@@ -44,6 +44,17 @@ By default, the hyperlink on the current page is recognized and the content is s
       // To avoid search index collision
       // between multiple websites under the same domain
       namespace: 'website-1',
+
+      // Use different indexes for path prefixes (namespaces).
+      // NOTE: Only works in 'auto' mode.
+      //
+      // When initialiazing an index, we look for the first path from the sidebar.
+      // If it matches the prefix from the list, we switch to the corresponding index.
+      pathNamespaces: ['/zh-cn', '/ru-ru', '/ru-ru/v1'],
+
+      // You can provide a regexp to match prefixes. In this case,
+      // the matching substring will be used to identify the index
+      pathNamespaces: /^(\/(zh-cn|ru-ru))?(\/(v1|v2))?/
     }
   }
 </script>

index.html

@@ -51,7 +51,8 @@
           '/de-de/': 'Suche',
           '/zh-cn/': '搜索',
           '/': 'Search'
-        }
+        },
+        pathNamespaces: ['/zh-cn', '/de-de', '/ru-ru', '/es']
       },
       plugins: [
         function (hook, vm) {

src/plugins/search/index.js

@@ -10,6 +10,7 @@ const CONFIG = {
   maxAge: 86400000, // 1 day
   hideOtherSidebarContent: false,
   namespace: undefined,
+  pathNamespaces: undefined,
 };
 
 const install = function(hook, vm) {
@@ -27,6 +28,7 @@ const install = function(hook, vm) {
     CONFIG.hideOtherSidebarContent =
       opts.hideOtherSidebarContent || CONFIG.hideOtherSidebarContent;
     CONFIG.namespace = opts.namespace || CONFIG.namespace;
+    CONFIG.pathNamespaces = opts.pathNamespaces || CONFIG.pathNamespaces;
   }
 
   const isAuto = CONFIG.paths === 'auto';

src/plugins/search/search.js

@@ -198,9 +198,29 @@ export function search(query) {
 
 export function init(config, vm) {
   const isAuto = config.paths === 'auto';
+  const paths = isAuto ? getAllPaths(vm.router) : config.paths;
+
+  let namespaceSuffix = '';
+
+  // only in auto mode
+  if (isAuto && config.pathNamespaces) {
+    const path = paths[0];
+
+    if (Array.isArray(config.pathNamespaces)) {
+      namespaceSuffix =
+        config.pathNamespaces.find(prefix => path.startsWith(prefix)) ||
+        namespaceSuffix;
+    } else if (config.pathNamespaces instanceof RegExp) {
+      const matches = path.match(config.pathNamespaces);
+
+      if (matches) {
+        namespaceSuffix = matches[0];
+      }
+    }
+  }
 
-  const expireKey = resolveExpireKey(config.namespace);
-  const indexKey = resolveIndexKey(config.namespace);
+  const expireKey = resolveExpireKey(config.namespace) + namespaceSuffix;
+  const indexKey = resolveIndexKey(config.namespace) + namespaceSuffix;
 
   const isExpired = localStorage.getItem(expireKey) < Date.now();
 
@@ -212,15 +232,9 @@ export function init(config, vm) {
     return;
   }
 
-  const paths = isAuto ? getAllPaths(vm.router) : config.paths;
   const len = paths.length;
   let count = 0;
 
-  // Fix search error when exist translations documents
-  if (INDEXS !== null && !INDEXS[paths[0]]) {
-    INDEXS = {};
-  }
-
   paths.forEach(path => {
     if (INDEXS[path]) {
       return count++;