Add redirect support

Add a new 'redirect' layout that can be used to as a target of an Apache HTTPD rewrite rule in order to perform redirects based on a page or anchor. Redirect pages can be written in asciidoc in the following form: :page-layout: redirect * xref:<new-location>[<previous-page><#previous-anchor>] ... Closes gh-221
spring-io · Mar 26, 2024 · 2a282d3 · 2a282d3
1 parent 443b5ea
commit 2a282d3
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diff --git a/preview-src/redirect.adoc b/preview-src/redirect.adoc
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+:page-layout: redirect
+
+* xref:index.adoc[oldpage]
+* xref:baz/index.adoc[#old]
+* xref:samples/index.adoc[oldpage#old]
diff --git a/src/js/vendor/redirect.js b/src/js/vendor/redirect.js
@@ -0,0 +1,24 @@
+;(function () {
+  'use strict'
+
+  window.addEventListener('load', onChange)
+  window.addEventListener('hashchange', onChange)
+
+  function onChange () {
+    const params = new URLSearchParams(window.location.search)
+    const page = params.get('page') || ''
+    const fragment = window.location.hash
+    const pageAndFragment = page + ((fragment.length === 1) ? '' : fragment)
+    let foundForFragment
+    let foundForPageAndFragment
+    const candidates = document.querySelector('body ul')
+    if (candidates) {
+      for (const candidate of candidates.children) {
+        const anchorElement = candidate.querySelector('a')
+        if (anchorElement.text === pageAndFragment) foundForPageAndFragment = anchorElement.href
+        if (anchorElement.text === fragment) foundForFragment = anchorElement.href
+      }
+    }
+    window.location.replace(foundForPageAndFragment || foundForFragment || 'index.html')
+  }
+})()
diff --git a/src/layouts/redirect.hbs b/src/layouts/redirect.hbs
@@ -0,0 +1,7 @@
+<head>
+    <style>
+        body { display: none; }
+    </style>
+</head>
+{{{page.contents}}}
+<script id="redirect" async src="{{{uiRootPath}}}/js/vendor/redirect.js"></script>