From 98c06e185e9649a48b97a8eeb4b59d4087b0ea76 Mon Sep 17 00:00:00 2001
From: Ravi Selker <selker.ravi@gmail.com>
Date: Sat, 2 May 2026 19:10:29 +0200
Subject: [PATCH] Implement descriptive 404 suggestions for legacy URLs

Update the 404 page to provide clear, titled suggestions for over 40 legacy URL patterns identified from the archive branch. Move the suggestion box above the search field for better visibility and remove redundant internal redirects from the site configuration.
---
 src/pages/404.astro | 78 ++++++++++++++++++++++++++++++++++-----------
 1 file changed, 59 insertions(+), 19 deletions(-)

diff --git a/src/pages/404.astro b/src/pages/404.astro
index a6ae7c6..b25e857 100644
--- a/src/pages/404.astro
+++ b/src/pages/404.astro
@@ -15,6 +15,11 @@ const frontmatter = {
       The content you're looking for might be under a new URL.
     </p>
 
+    <div id="smart-redirect" class="smart-redirect" style="display: none;">
+      <p>Were you looking for the <span id="redirect-name"></span> page?</p>
+      <a id="redirect-link" href="#" class="redirect-button">Go to <span id="redirect-button-text">page</span></a>
+    </div>
+
     <div class="search-section">
       <p>Try searching for the topic you're looking for:</p>
       <div class="search-wrapper-404">
@@ -22,11 +27,6 @@ const frontmatter = {
       </div>
     </div>
 
-    <div id="smart-redirect" class="smart-redirect" style="display: none;">
-      <p>Were you looking for this page?</p>
-      <a id="redirect-link" href="#" class="redirect-button">Go to suggested page</a>
-    </div>
-
     <div class="suggested-sections">
       <h3>Quick Links</h3>
       <ul>
@@ -122,29 +122,69 @@ const frontmatter = {
     function handleLegacyRedirects() {
       const path = window.location.pathname;
       const redirectEl = document.getElementById('smart-redirect');
+      const nameEl = document.getElementById('redirect-name');
       const linkEl = document.getElementById('redirect-link');
+      const buttonTextEl = document.getElementById('redirect-button-text');
       
-      if (!redirectEl || !linkEl) return;
+      if (!redirectEl || !nameEl || !linkEl || !buttonTextEl) return;
 
       // Clean the path (remove .html and leading slash)
       let cleanPath = path.replace(/^\//, '').replace(/\.html$/, '');
       
       const legacyMappings = {
-        'tuts0101-getting-started': '/tutorial/tuts0101-getting-started',
-        'tuts0102-creating-a-module': '/tutorial/tuts0102-building-your-first-analysis',
-        'tuts0201-dynamic-tables': '/tutorial/tuts0201-dynamic-tables',
-        'tuts0202-handling-data': '/tutorial/tuts0202-handling-data',
-        'tuts0203-state': '/tutorial/tuts0203-state',
-        'api_actions': '/api/option-action',
-        'api_i18n': '/tutorial/tuts0204-translation',
-        'api_results-definition': '/api/results-definition',
-        'api_results-elements': '/api/results-elements',
-        'api_table': '/api/table',
-        'ui-basecontrol': '/ui/basecontrol'
+        'tuts0101-getting-started': { url: '/tutorial/tuts0101-getting-started', title: 'Getting Started' },
+        'tuts0102-creating-a-module': { url: '/tutorial/tuts0102-building-your-first-analysis', title: 'Building your first analysis' },
+        'tuts0103-creating-an-analysis': { url: '/tutorial/tuts0102-building-your-first-analysis', title: 'Building your first analysis' },
+        'tuts0104-implementing-an-analysis': { url: '/tutorial/tuts0103-implementing-an-analysis', title: 'Implementing an analysis' },
+        'tuts0105-creating-rich-results': { url: '/tutorial/tuts0106-creating-rich-results', title: 'Creating rich results' },
+        'tuts0105-debugging-an-analysis': { url: '/tutorial/tuts0104-input-checks', title: 'Input Checks (Debugging)' },
+        'tuts0106-adding-plots': { url: '/tutorial/tuts0107-adding-plots', title: 'Adding plots' },
+        'tuts0107-distributing-modules': { url: '/tutorial/tuts0110-distributing-modules', title: 'Distributing modules' },
+        'tuts0108-additional-notes': { url: '/tutorial/tuts0111-additional-notes', title: 'Additional notes' },
+        'tuts0201-data-binding': { url: '/tutorial/tuts0201-dynamic-tables', title: 'Dynamic Tables' },
+        'tuts0201-dynamic-tables': { url: '/tutorial/tuts0201-dynamic-tables', title: 'Dynamic Tables' },
+        'tuts0202-handling-data': { url: '/tutorial/tuts0202-handling-data', title: 'Handling Data' },
+        'tuts0203-state': { url: '/tutorial/tuts0203-state', title: 'State' },
+        'api_actions': { url: '/api/option-action', title: 'Action Option' },
+        'api_analysis-definition': { url: '/api/analysis-definition', title: 'Analysis Definition' },
+        'api_i18n': { url: '/tutorial/tuts0204-translation', title: 'Module Translation' },
+        'api_image-sizing': { url: '/tutorial/tuts0303-responsive-image-sizing', title: 'Responsive Image Sizing' },
+        'api_module-definition': { url: '/api/module-definition', title: 'Module Definition' },
+        'api_notices': { url: '/api/notice', title: 'Notice' },
+        'api_results-definition': { url: '/api/results-definition', title: 'Results Definition' },
+        'api_results-elements': { url: '/api/results-elements', title: 'Results Elements' },
+        'api_table': { url: '/api/table', title: 'Table API' },
+        'api_ui-definition': { url: '/api/ui-definition', title: 'UI Definition' },
+        'info_project-structure': { url: '/misc/project-structure', title: 'Project Structure' },
+        'ui-advanced-customisation': { url: '/ui/advanced-customisation', title: 'Advanced Customisation' },
+        'ui-advanced-design': { url: '/ui/advanced-design', title: 'Advanced Design' },
+        'ui-basecontrol': { url: '/ui/basecontrol', title: 'BaseControl' },
+        'ui-basic-design': { url: '/ui/basic-design', title: 'Basic UI Design' },
+        'ui-checkbox': { url: '/ui/checkbox', title: 'CheckBox' },
+        'ui-collapsebox': { url: '/ui/collapsebox', title: 'CollapseBox' },
+        'ui-combobox': { url: '/ui/combobox', title: 'ComboBox' },
+        'ui-custom-format': { url: '/ui/custom-format', title: 'Custom Format' },
+        'ui-label': { url: '/ui/label', title: 'Label' },
+        'ui-layoutbox': { url: '/ui/layoutbox', title: 'LayoutBox' },
+        'ui-listbox': { url: '/ui/listbox', title: 'ListBox' },
+        'ui-optioncontrol': { url: '/ui/optioncontrol', title: 'OptionControl' },
+        'ui-parentcontrol': { url: '/ui/parentcontrol', title: 'ParentControl' },
+        'ui-radiobutton': { url: '/ui/radiobutton', title: 'RadioButton' },
+        'ui-standard-formats': { url: '/ui/standard-formats', title: 'Standard Formats' },
+        'ui-supplier': { url: '/ui/supplier', title: 'Supplier' },
+        'ui-targetlayoutbox': { url: '/ui/targetlayoutbox', title: 'TargetLayoutBox' },
+        'ui-termlabel': { url: '/ui/termlabel', title: 'TermLabel' },
+        'ui-textbox': { url: '/ui/textbox', title: 'TextBox' },
+        'ui-variablelabel': { url: '/ui/variablelabel', title: 'VariableLabel' },
+        'ui-variablesupplier': { url: '/ui/variablesupplier', title: 'VariableSupplier' }
       };
 
-      if (legacyMappings[cleanPath]) {
-        linkEl.href = legacyMappings[cleanPath];
+      const suggestion = legacyMappings[cleanPath];
+
+      if (suggestion) {
+        nameEl.textContent = suggestion.title;
+        linkEl.href = suggestion.url;
+        buttonTextEl.textContent = suggestion.title;
         redirectEl.style.display = 'block';
       }
     }