Support sites deployed on paths other than "/" (by generating relative links)

lib/assets/javascripts/_modules/collapsible-navigation.js

@@ -57,25 +57,31 @@
       $toggleLabel.text(setOpen ? 'Collapse ' + $heading.text() : 'Expand ' + $heading.text())
     }
 
+    /**
+     * Returns an absolute pathname to $target by combining it with window.location.href
+     * @param $target The target whose pathname to return. This may be an anchor with an absolute or relative href.
+     * @returns {string} The absolute pathname of $target
+     */
+    function getAbsolutePath ($target) {
+      return new URL($target.attr('href'), window.location.href).pathname
+    }
+
     function openActiveHeading () {
       var $activeElement
       var currentPath = window.location.pathname
-      var isActiveTrail = '[href*="' + currentPath + '"]'
-      // Add an exception for the root page, as every href includes /
-      if (currentPath === '/') {
-        isActiveTrail = '[href="' + currentPath + window.location.hash + '"]'
-      }
       for (var i = $topLevelItems.length - 1; i >= 0; i--) {
         var $element = $($topLevelItems[i])
         var $heading = $element.find('> a')
         // Check if this item href matches
-        if ($heading.is(isActiveTrail)) {
+        if (getAbsolutePath($heading) === currentPath) {
           $activeElement = $element
           break
         }
         // Otherwise check the children
         var $children = $element.find('li > a')
-        var $matchingChildren = $children.filter(isActiveTrail)
+        var $matchingChildren = $children.filter(function (_) {
+          return getAbsolutePath($(this)) === currentPath
+        })
         if ($matchingChildren.length) {
           $activeElement = $element
           break

lib/assets/javascripts/_modules/in-page-navigation.js

@@ -70,13 +70,18 @@
     function highlightActiveItemInToc (fragment) {
       // Navigation items for single page navigation don't necessarily include the path name, but
       // navigation items for multipage navigation items do include it. This checks for either case.
-      var $activeTocItem = $tocItems.filter(
-        '[href="' + window.location.pathname + fragment + '"],[href="' + fragment + '"]'
-      )
+      var $activeTocItem = $tocItems.filter(function (_) {
+        var url = new URL($(this).attr('href'), window.location.href)
+        return url.href === window.location.href
+      })
+
       // Navigation items with children don't contain fragments in their url
       // Check to see if any nav items contain just the path name.
       if (!$activeTocItem.get(0)) {
-        $activeTocItem = $tocItems.filter('[href="' + window.location.pathname + '"]')
+        $activeTocItem = $tocItems.filter(function (_) {
+          var url = new URL($(this).attr('href'), window.location.href)
+          return url.hash === '' && url.pathname === window.location.pathname
+        })
       }
       if ($activeTocItem.get(0)) {
         $tocItems.removeClass('toc-link--in-view')

lib/assets/javascripts/_modules/search.js

@@ -16,6 +16,7 @@
     var results
     var query
     var maxSearchEntries = 20
+    var pathToSiteRoot
     var searchIndexPath
 
     this.start = function start ($element) {
@@ -27,6 +28,7 @@
       $searchResultsTitle = $searchResultsWrapper.find('.search-results__title')
       $searchHelp = $('#search-help')
       searchIndexPath = $element.data('searchIndexPath')
+      pathToSiteRoot = $element.data('pathToSiteRoot')
 
       changeSearchAction()
       changeSearchLabel()
@@ -40,7 +42,7 @@
           query = s.getQuery()
           if (query) {
             $searchInput.val(query)
-            doSearch(query)
+            doSearch(query, pathToSiteRoot)
             doAnalytics()
             document.title = query + ' - ' + document.title
           }
@@ -51,7 +53,7 @@
     this.downloadSearchIndex = function downloadSearchIndex () {
       updateTitle('Loading search results')
       $.ajax({
-        url: searchIndexPath,
+        url: pathToSiteRoot + (searchIndexPath.startsWith('/') ? searchIndexPath.slice(1) : searchIndexPath),
         cache: true,
         method: 'GET',
         success: function (data) {
@@ -67,7 +69,7 @@
       // We need JavaScript to do search, so if JS is not available the search
       // input sends the query string to Google. This JS function changes the
       // input to instead send it to the search page.
-      $searchForm.prop('action', '/search')
+      $searchForm.prop('action', pathToSiteRoot + 'search/index.html')
       $searchForm.find('input[name="as_sitesearch"]').remove()
     }
 
@@ -88,10 +90,10 @@
       return query
     }
 
-    function doSearch (query) {
+    function doSearch (query, pathToSiteRoot) {
       s.search(query, function (r) {
         results = r
-        renderResults(query)
+        renderResults(query, pathToSiteRoot)
         updateTitle()
       })
     }
@@ -140,7 +142,7 @@
       callback(getResults(query))
     }
 
-    function renderResults (query) {
+    function renderResults (query, pathToSiteRoot) {
       var output = ''
       if (results.length === 0) {
         output += '<p>Nothing found</p>'
@@ -151,7 +153,9 @@
         var content = s.processContent(result.content, query)
         output += '<li class="search-result">'
         output += '<h3 class="search-result__title">'
-        output += '<a href="' + result.url + '">'
+        var pagePathWithoutLeadingSlash = result.url.startsWith('/') ? result.url.slice(1) : result.url
+        var url = pathToSiteRoot.startsWith('.') ? pathToSiteRoot + pagePathWithoutLeadingSlash : '/' + pagePathWithoutLeadingSlash
+        output += '<a href="' + url + '">'
         output += result.title
         output += '</a>'
         output += '</h3>'

lib/govuk_tech_docs.rb

@@ -67,6 +67,7 @@ def self.configure(context, options = {})
     context.activate :api_reference
 
     context.helpers do
+      include GovukTechDocs::PathHelpers
       include GovukTechDocs::TableOfContents::Helpers
       include GovukTechDocs::ContributionBanner
 

lib/govuk_tech_docs/pages.rb

@@ -1,10 +1,12 @@
 module GovukTechDocs
   class Pages
+    include GovukTechDocs::PathHelpers
     attr_reader :sitemap
 
-    def initialize(sitemap, config)
+    def initialize(sitemap, config, current_page)
       @sitemap = sitemap
       @config = config
+      @current_page = current_page
     end
 
     def to_json(*_args)
@@ -18,7 +20,7 @@ def as_json
         review = PageReview.new(page, @config)
         {
           title: page.data.title,
-          url: "#{@config[:tech_docs][:host]}#{page.url}",
+          url: get_path_to_resource(@config, page, @current_page).to_s,
           review_by: review.review_by,
           owner_slack: review.owner_slack,
         }

lib/govuk_tech_docs/path_helpers.rb

@@ -0,0 +1,30 @@
+module GovukTechDocs
+  module PathHelpers
+    def get_path_to_resource(config, resource, current_page)
+      if config[:relative_links]
+        resource_path_segments = resource.path.split("/").reject(&:empty?)[0..-2]
+        resource_file_name = resource.path.split("/")[-1]
+
+        path_to_site_root = path_to_site_root config, current_page.path
+        resource_path = path_to_site_root + resource_path_segments
+                                           .push(resource_file_name)
+                                           .join("/")
+      else
+        resource_path = resource.url
+      end
+      resource_path
+    end
+
+    def path_to_site_root(config, page_path)
+      if config[:relative_links]
+        number_of_ascents_to_site_root = page_path.to_s.split("/").reject(&:empty?)[0..-2].length
+        ascents = number_of_ascents_to_site_root.zero? ? ["."] : number_of_ascents_to_site_root.times.collect { ".." }
+        path_to_site_root = ascents.join("/").concat("/")
+      else
+        middleman_http_prefix = config[:http_prefix]
+        path_to_site_root = middleman_http_prefix.end_with?("/") ? middleman_http_prefix : "#{middleman_http_prefix}/"
+      end
+      path_to_site_root
+    end
+  end
+end

lib/govuk_tech_docs/table_of_contents/helpers.rb

@@ -1,3 +1,4 @@
+require "govuk_tech_docs/path_helpers"
 require "govuk_tech_docs/table_of_contents/heading_tree_builder"
 require "govuk_tech_docs/table_of_contents/heading_tree_renderer"
 require "govuk_tech_docs/table_of_contents/heading_tree"
@@ -7,6 +8,8 @@
 module GovukTechDocs
   module TableOfContents
     module Helpers
+      include GovukTechDocs::PathHelpers
+
       def single_page_table_of_contents(html, url: "", max_level: nil)
         output = "<ul>\n"
         output += list_items_from_headings(html, url: url, max_level: max_level)
@@ -48,11 +51,7 @@ def render_page_tree(resources, current_page, config, current_page_html)
 
           # Reuse the generated content for the active page
           # If we generate it twice it increments the heading ids
-          content = if current_page.url == resource.url && current_page_html
-                      current_page_html
-                    else
-                      resource.render(layout: false)
-                    end
+          content = current_page.url == resource.url && current_page_html ? current_page_html : resource.render(layout: false)
           # Avoid redirect pages
           next if content.include? "http-equiv=refresh"
 
@@ -71,15 +70,16 @@ def render_page_tree(resources, current_page, config, current_page_html)
               config[:http_prefix] + "/"
             end
 
+          link_value = get_path_to_resource(config, resource, current_page)
           if resource.children.any? && resource.url != home_url
-            output += %{<li><a href="#{resource.url}"><span>#{resource.data.title}</span></a>\n}
+            output += %{<li><a href="#{link_value}"><span>#{resource.data.title}</span></a>\n}
             output += render_page_tree(resource.children, current_page, config, current_page_html)
             output += "</li>\n"
           else
             output +=
               list_items_from_headings(
                 content,
-                url: resource.url,
+                url: link_value,
                 max_level: config[:tech_docs][:max_toc_heading_level],
               )
           end

lib/source/api/pages.json.erb

@@ -1 +1 @@
-<%= GovukTechDocs::Pages.new(sitemap, config).to_json %>
+<%= GovukTechDocs::Pages.new(sitemap, config, current_page).to_json %>

lib/source/layouts/_search.erb

@@ -1,5 +1,5 @@
 <% if config[:tech_docs][:enable_search] %>
-<div class="search" data-module="search" data-search-index-path="<%= search_index_path %>">
+<div class="search" data-module="search" data-path-to-site-root="<%= path_to_site_root config, current_page.path %>" data-search-index-path="<%= search_index_path %>">
   <form action="https://www.google.co.uk/search" method="get" role="search" class="search__form govuk-!-margin-bottom-4">
     <input type="hidden" name="as_sitesearch" value="<%= config[:tech_docs][:host] %>"/>
     <label class="govuk-label search__label" for="search" aria-hidden="true">

spec/govuk_tech_docs/pages_spec.rb

@@ -1,17 +1,33 @@
 RSpec.describe GovukTechDocs::Pages do
   describe "#to_json" do
-    it "returns the pages as JSON" do
+    it "returns the pages as JSON when using absolute links" do
+      current_page = double(path: "/api/pages.json")
       sitemap = double(resources: [
         double(url: "/a.html", data: double(title: "A thing", owner_slack: "#2ndline", last_reviewed_on: Date.yesterday, review_in: "0 days")),
         double(url: "/b.html", data: double(title: "B thing", owner_slack: "#2ndline", last_reviewed_on: Date.yesterday, review_in: "2 days")),
       ])
 
-      json = described_class.new(sitemap, tech_docs: {}).to_json
+      json = described_class.new(sitemap, {}, current_page).to_json
 
       expect(JSON.parse(json)).to eql([
         { "title" => "A thing", "url" => "/a.html", "review_by" => Date.yesterday.to_s, "owner_slack" => "#2ndline" },
         { "title" => "B thing", "url" => "/b.html", "review_by" => Date.tomorrow.to_s, "owner_slack" => "#2ndline" },
       ])
     end
+
+    it "returns the pages as JSON when using relative links" do
+      current_page = double(path: "/api/pages.json")
+      sitemap = double(resources: [
+        double(url: "/a.html", path: "/a.html", data: double(title: "A thing", owner_slack: "#2ndline", last_reviewed_on: Date.yesterday, review_in: "0 days")),
+        double(url: "/b/c.html", path: "/b/c.html", data: double(title: "B thing", owner_slack: "#2ndline", last_reviewed_on: Date.yesterday, review_in: "2 days")),
+      ])
+
+      json = described_class.new(sitemap, { relative_links: true }, current_page).to_json
+
+      expect(JSON.parse(json)).to eql([
+        { "title" => "A thing", "url" => "../a.html", "review_by" => Date.yesterday.to_s, "owner_slack" => "#2ndline" },
+        { "title" => "B thing", "url" => "../b/c.html", "review_by" => Date.tomorrow.to_s, "owner_slack" => "#2ndline" },
+      ])
+    end
   end
 end

spec/govuk_tech_docs/path_helpers_spec.rb

@@ -0,0 +1,64 @@
+RSpec.describe GovukTechDocs::PathHelpers do
+  include GovukTechDocs::PathHelpers
+
+  describe "#get_path_to_resource" do
+    it "calculates the path to a resource when using absolute links" do
+      resource_url = "/documentation/introduction/index.html"
+
+      config = {}
+      resource = double("resource", url: resource_url)
+
+      resource_path = get_path_to_resource(config, resource, nil)
+      expect(resource_path).to eql(resource_url)
+    end
+
+    it "calculates the path to a resource when using relative links" do
+      current_page_path = "/documentation/introduction/section-one/index.html"
+      url = "/documentation/introduction/index.html"
+
+      config = {
+        relative_links: true,
+      }
+      resource = double("resource", url: url, path: url)
+      current_page = double("current_page", path: current_page_path)
+
+      resource_path = get_path_to_resource(config, resource, current_page)
+      expect(resource_path).to eql("../../../documentation/introduction/index.html")
+    end
+  end
+
+  describe "#path_to_site_root" do
+    it "calculates the path from a page to the site root when using absolute links" do
+      page_path = "/documentation/introduction/index.html"
+
+      config = {
+        http_prefix: "/", # This is Middleman's default setting.
+      }
+
+      path_to_site_root = path_to_site_root(config, page_path)
+      expect(path_to_site_root).to eql("/")
+    end
+
+    it "calculates the path from a page to the site root when a middleman http prefix" do
+      page_path = "/bananas/documentation/introduction/index.html"
+
+      config = {
+        http_prefix: "/bananas",
+      }
+
+      path_to_site_root = path_to_site_root(config, page_path)
+      expect(path_to_site_root).to eql("/bananas/")
+    end
+
+    it "calculates the path from a page to the site root when using relative links" do
+      page_path = "/documentation/introduction/index.html"
+
+      config = {
+        relative_links: true,
+      }
+
+      path_to_site_root = path_to_site_root(config, page_path)
+      expect(path_to_site_root).to eql("../../")
+    end
+  end
+end

spec/javascripts/search-spec.js

@@ -10,7 +10,7 @@ describe('Search', function () {
 
   beforeEach(function () {
     module = new GOVUK.Modules.Search()
-    $element = $('<div class="search" data-module="search">' +
+    $element = $('<div class="search" data-module="search" data-path-to-site-root="/">' +
   '<form action="https://www.google.co.uk/search" method="get" role="search">' +
     '<input type="hidden" name="as_sitesearch" value="<%= config[:tech_docs][:host] %>"/>' +
     '<label for="search"  class="govuk-label search__label">Search (via Google)</label>' +