Allow to sort wiki pages by date and title

- Add controls for sorting by title and date
- Execute Gitaly call which now accepts sorting params for wikis

12 files changed, 259 insertions, 33 deletions

diff --git a/app/controllers/projects/wikis_controller.rb b/app/controllers/projects/wikis_controller.rb
index da2420633ef..88910c91763 100644
--- a/app/controllers/projects/wikis_controller.rb
+++ b/app/controllers/projects/wikis_controller.rb
@@ -16,7 +16,10 @@ class Projects::WikisController < Projects::ApplicationController
   end
 
   def pages
-    @wiki_pages = Kaminari.paginate_array(@project_wiki.pages).page(params[:page])
+    @wiki_pages = Kaminari.paginate_array(
+      @project_wiki.pages(sort: params[:sort], direction: params[:direction])
+    ).page(params[:page])
+
     @wiki_entries = WikiPage.group_by_directory(@wiki_pages)
   end
 
diff --git a/app/helpers/wiki_helper.rb b/app/helpers/wiki_helper.rb
index 647f34e57ed..edd48f82729 100644
--- a/app/helpers/wiki_helper.rb
+++ b/app/helpers/wiki_helper.rb
@@ -47,4 +47,24 @@ module WikiHelper
   def wiki_attachment_upload_url
     expose_url(api_v4_projects_wikis_attachments_path(id: @project.id))
   end
+
+  def wiki_sort_controls(project, sort, direction)
+    sort ||= ProjectWiki::TITLE_ORDER
+    link_class = 'btn btn-default has-tooltip reverse-sort-btn qa-reverse-sort'
+    reversed_direction = direction == 'desc' ? 'asc' : 'desc'
+    icon_class = direction == 'desc' ? 'highest' : 'lowest'
+
+    link_to(project_wikis_pages_path(project, sort: sort, direction: reversed_direction),
+      type: 'button', class: link_class, title: _('Sort direction')) do
+      sprite_icon("sort-#{icon_class}", size: 16)
+    end
+  end
+
+  def wiki_sort_title(key)
+    if key == ProjectWiki::CREATED_AT_ORDER
+      s_("Wiki|Created date")
+    else
+      s_("Wiki|Title")
+    end
+  end
 end
diff --git a/app/models/project_wiki.rb b/app/models/project_wiki.rb
index 268706a6aea..23ddd708396 100644
--- a/app/models/project_wiki.rb
+++ b/app/models/project_wiki.rb
@@ -13,6 +13,11 @@ class ProjectWiki
   CouldNotCreateWikiError = Class.new(StandardError)
   SIDEBAR = '_sidebar'
 
+  TITLE_ORDER = 'title'
+  CREATED_AT_ORDER = 'created_at'
+  DIRECTION_DESC = 'desc'
+  DIRECTION_ASC = 'asc'
+
   # Returns a string describing what went wrong after
   # an operation fails.
   attr_reader :error_message
@@ -82,8 +87,15 @@ class ProjectWiki
 
   # Returns an Array of GitLab WikiPage instances or an
   # empty Array if this Wiki has no pages.
-  def pages(limit: 0)
-    wiki.pages(limit: limit).map { |page| WikiPage.new(self, page, true) }
+  def pages(limit: 0, sort: nil, direction: DIRECTION_ASC)
+    sort ||= TITLE_ORDER
+    direction_desc = direction == DIRECTION_DESC
+
+    wiki.pages(
+      limit: limit, sort: sort, direction_desc: direction_desc
+    ).map do |page|
+      WikiPage.new(self, page, true)
+    end
   end
 
   # Finds a page within the repository based on a tile
diff --git a/app/models/wiki_page.rb b/app/models/wiki_page.rb
index 64daba81dcf..909da4316d0 100644
--- a/app/models/wiki_page.rb
+++ b/app/models/wiki_page.rb
@@ -28,16 +28,15 @@ class WikiPage
   def self.group_by_directory(pages)
     return [] if pages.blank?
 
-    pages.sort_by { |page| [page.directory, page.slug] }
-      .group_by(&:directory)
-      .map do |dir, pages|
-        if dir.present?
-          WikiDirectory.new(dir, pages)
-        else
-          pages
-        end
-      end
-      .flatten
+    pages.each_with_object([]) do |page, grouped_pages|
+      next grouped_pages << page unless page.directory.present?
+
+      directory = grouped_pages.find { |dir| dir.slug == page.directory }
+
+      next directory.pages << page if directory
+
+      grouped_pages << WikiDirectory.new(page.directory, [page])
+    end
   end
 
   def self.unhyphenize(name)
diff --git a/app/views/projects/wikis/pages.html.haml b/app/views/projects/wikis/pages.html.haml
index 94267b6e0cf..77fdf7f001c 100644
--- a/app/views/projects/wikis/pages.html.haml
+++ b/app/views/projects/wikis/pages.html.haml
@@ -2,6 +2,7 @@
 - add_to_breadcrumbs "Wiki", project_wiki_path(@project, :home)
 - breadcrumb_title s_("Wiki|Pages")
 - page_title s_("Wiki|Pages"), _("Wiki")
+- sort_title = wiki_sort_title(params[:sort])
 
 %div{ class: container_class }
   .wiki-page-header
@@ -15,6 +16,18 @@
         = icon('cloud-download')
         = _("Clone repository")
 
+      .dropdown.inline.wiki-sort-dropdown
+        .btn-group{ role: 'group' }
+          .btn-group{ role: 'group' }
+            %button.dropdown-toggle{ type: 'button', data: { toggle: 'dropdown', display: 'static' }, class: 'btn btn-default' }
+              = sort_title
+              = icon('chevron-down')
+            %ul.dropdown-menu.dropdown-menu-right.dropdown-menu-selectable.dropdown-menu-sort
+              %li
+                = sortable_item(s_("Wiki|Title"), project_wikis_pages_path(@project, sort: ProjectWiki::TITLE_ORDER), sort_title)
+                = sortable_item(s_("Wiki|Created date"), project_wikis_pages_path(@project, sort: ProjectWiki::CREATED_AT_ORDER), sort_title)
+          = wiki_sort_controls(@project, params[:sort], params[:direction])
+
   %ul.wiki-pages-list.content-list
     = render @wiki_entries, context: 'pages'
 
diff --git a/changelogs/unreleased/id-51433-sort-wiki-by-date.yml b/changelogs/unreleased/id-51433-sort-wiki-by-date.yml
new file mode 100644
index 00000000000..86fcf195fa7
--- /dev/null
+++ b/changelogs/unreleased/id-51433-sort-wiki-by-date.yml
@@ -0,0 +1,5 @@
+---
+title: Allow to sort wiki pages by date and title
+merge_request: 25365
+author:
+type: added
diff --git a/lib/gitlab/git/wiki.rb b/lib/gitlab/git/wiki.rb
index c43331bed60..a0dd4a24363 100644
--- a/lib/gitlab/git/wiki.rb
+++ b/lib/gitlab/git/wiki.rb
@@ -86,9 +86,9 @@ module Gitlab
         end
       end
 
-      def pages(limit: 0)
+      def pages(limit: 0, sort: nil, direction_desc: false)
         wrapped_gitaly_errors do
-          gitaly_get_all_pages(limit: limit)
+          gitaly_get_all_pages(limit: limit, sort: sort, direction_desc: direction_desc)
         end
       end
 
@@ -168,8 +168,10 @@ module Gitlab
         Gitlab::Git::WikiFile.new(wiki_file)
       end
 
-      def gitaly_get_all_pages(limit: 0)
-        gitaly_wiki_client.get_all_pages(limit: limit).map do |wiki_page, version|
+      def gitaly_get_all_pages(limit: 0, sort: nil, direction_desc: false)
+        gitaly_wiki_client.get_all_pages(
+          limit: limit, sort: sort, direction_desc: direction_desc
+        ).map do |wiki_page, version|
           Gitlab::Git::WikiPage.new(wiki_page, version)
         end
       end
diff --git a/lib/gitlab/gitaly_client/wiki_service.rb b/lib/gitlab/gitaly_client/wiki_service.rb
index 15c9463e2f2..e036cdcd800 100644
--- a/lib/gitlab/gitaly_client/wiki_service.rb
+++ b/lib/gitlab/gitaly_client/wiki_service.rb
@@ -87,8 +87,13 @@ module Gitlab
         wiki_page_from_iterator(response)
       end
 
-      def get_all_pages(limit: 0)
-        request = Gitaly::WikiGetAllPagesRequest.new(repository: @gitaly_repo, limit: limit)
+      def get_all_pages(limit: 0, sort: nil, direction_desc: false)
+        sort_value = Gitaly::WikiGetAllPagesRequest::SortBy.resolve(sort.to_s.upcase.to_sym)
+
+        params = { repository: @gitaly_repo, limit: limit, direction_desc: direction_desc }
+        params[:sort] = sort_value if sort_value
+
+        request = Gitaly::WikiGetAllPagesRequest.new(params)
         response = GitalyClient.call(@repository.storage, :wiki_service, :wiki_get_all_pages, request, timeout: GitalyClient.medium_timeout)
         pages = []
 
diff --git a/locale/gitlab.pot b/locale/gitlab.pot
index 9de34dd92ea..669028625ab 100644
--- a/locale/gitlab.pot
+++ b/locale/gitlab.pot
@@ -7417,6 +7417,9 @@ msgstr ""
 msgid "Sort by"
 msgstr ""
 
+msgid "Sort direction"
+msgstr ""
+
 msgid "SortOptions|Access level, ascending"
 msgstr ""
 
@@ -9197,6 +9200,9 @@ msgstr ""
 msgid "Wiki|Create page"
 msgstr ""
 
+msgid "Wiki|Created date"
+msgstr ""
+
 msgid "Wiki|Edit Page"
 msgstr ""
 
@@ -9215,6 +9221,9 @@ msgstr ""
 msgid "Wiki|Pages"
 msgstr ""
 
+msgid "Wiki|Title"
+msgstr ""
+
 msgid "Wiki|Wiki Pages"
 msgstr ""
 
diff --git a/spec/features/projects/wiki/user_views_wiki_pages_spec.rb b/spec/features/projects/wiki/user_views_wiki_pages_spec.rb
new file mode 100644
index 00000000000..5c16d7783f0
--- /dev/null
+++ b/spec/features/projects/wiki/user_views_wiki_pages_spec.rb
@@ -0,0 +1,89 @@
+# frozen_string_literal: true
+
+require 'spec_helper'
+
+describe 'User views wiki pages' do
+  include WikiHelpers
+
+  let(:user) { create(:user) }
+  let(:project) { create(:project, :wiki_repo, namespace: user.namespace) }
+
+  let!(:wiki_page1) do
+    create(:wiki_page, wiki: project.wiki, attrs: { title: '3 home', content: '3' })
+  end
+  let!(:wiki_page2) do
+    create(:wiki_page, wiki: project.wiki, attrs: { title: '1 home', content: '1' })
+  end
+  let!(:wiki_page3) do
+    create(:wiki_page, wiki: project.wiki, attrs: { title: '2 home', content: '2' })
+  end
+
+  let(:pages) do
+    page.find('.wiki-pages-list').all('li').map { |li| li.find('a') }
+  end
+
+  before do
+    project.add_maintainer(user)
+    sign_in(user)
+    visit(project_wikis_pages_path(project))
+  end
+
+  context 'ordered by title' do
+    let(:pages_ordered_by_title) { [wiki_page2, wiki_page3, wiki_page1] }
+
+    context 'asc' do
+      it 'pages are displayed in direct order' do
+        pages.each.with_index do |page_title, index|
+          expect(page_title.text).to eq(pages_ordered_by_title[index].title)
+        end
+      end
+    end
+
+    context 'desc' do
+      before do
+        page.within('.wiki-sort-dropdown') do
+          page.find('.qa-reverse-sort').click
+        end
+      end
+
+      it 'pages are displayed in reversed order' do
+        pages.reverse_each.with_index do |page_title, index|
+          expect(page_title.text).to eq(pages_ordered_by_title[index].title)
+        end
+      end
+    end
+  end
+
+  context 'ordered by created_at' do
+    let(:pages_ordered_by_created_at) { [wiki_page1, wiki_page2, wiki_page3] }
+
+    before do
+      page.within('.wiki-sort-dropdown') do
+        click_button('Title')
+        click_link('Created date')
+      end
+    end
+
+    context 'asc' do
+      it 'pages are displayed in direct order' do
+        pages.each.with_index do |page_title, index|
+          expect(page_title.text).to eq(pages_ordered_by_created_at[index].title)
+        end
+      end
+    end
+
+    context 'desc' do
+      before do
+        page.within('.wiki-sort-dropdown') do
+          page.find('.qa-reverse-sort').click
+        end
+      end
+
+      it 'pages are displayed in reversed order' do
+        pages.reverse_each.with_index do |page_title, index|
+          expect(page_title.text).to eq(pages_ordered_by_created_at[index].title)
+        end
+      end
+    end
+  end
+end
diff --git a/spec/helpers/wiki_helper_spec.rb b/spec/helpers/wiki_helper_spec.rb
index 92c6f27a867..8eab40aeaf3 100644
--- a/spec/helpers/wiki_helper_spec.rb
+++ b/spec/helpers/wiki_helper_spec.rb
@@ -18,4 +18,56 @@ describe WikiHelper do
       end
     end
   end
+
+  describe '#wiki_sort_controls' do
+    let(:project) { create(:project) }
+    let(:wiki_link) { helper.wiki_sort_controls(project, sort, direction) }
+    let(:classes) { "btn btn-default has-tooltip reverse-sort-btn qa-reverse-sort" }
+
+    def expected_link(sort, direction, icon_class)
+      path = "/#{project.full_path}/wikis/pages?direction=#{direction}&sort=#{sort}"
+
+      helper.link_to(path, type: 'button', class: classes, title: 'Sort direction') do
+        helper.sprite_icon("sort-#{icon_class}", size: 16)
+      end
+    end
+
+    context 'initial call' do
+      let(:sort) { nil }
+      let(:direction) { nil }
+
+      it 'renders with default values' do
+        expect(wiki_link).to eq(expected_link('title', 'desc', 'lowest'))
+      end
+    end
+
+    context 'sort by title' do
+      let(:sort) { 'title' }
+      let(:direction) { 'asc' }
+
+      it 'renders a link with opposite direction' do
+        expect(wiki_link).to eq(expected_link('title', 'desc', 'lowest'))
+      end
+    end
+
+    context 'sort by created_at' do
+      let(:sort) { 'created_at' }
+      let(:direction) { 'desc' }
+
+      it 'renders a link with opposite direction' do
+        expect(wiki_link).to eq(expected_link('created_at', 'asc', 'highest'))
+      end
+    end
+  end
+
+  describe '#wiki_sort_title' do
+    it 'returns a title corresponding to a key' do
+      expect(helper.wiki_sort_title('created_at')).to eq('Created date')
+      expect(helper.wiki_sort_title('title')).to eq('Title')
+    end
+
+    it 'defaults to Title if a key is unknown' do
+      expect(helper.wiki_sort_title('unknown')).to eq('Title')
+    end
+  end
 end
diff --git a/spec/models/wiki_page_spec.rb b/spec/models/wiki_page_spec.rb
index e68da67818a..cacdb0e0595 100644
--- a/spec/models/wiki_page_spec.rb
+++ b/spec/models/wiki_page_spec.rb
@@ -20,12 +20,16 @@ describe WikiPage do
     context 'when there are pages' do
       before do
         create_page('dir_1/dir_1_1/page_3', 'content')
+        create_page('page_1', 'content')
         create_page('dir_1/page_2', 'content')
         create_page('dir_2/page_5', 'content')
+        create_page('page_6', 'content')
         create_page('dir_2/page_4', 'content')
-        create_page('page_1', 'content')
       end
+
       let(:page_1) { wiki.find_page('page_1') }
+      let(:page_6) { wiki.find_page('page_6') }
+
       let(:dir_1) do
         WikiDirectory.new('dir_1', [wiki.find_page('dir_1/page_2')])
       end
@@ -38,25 +42,38 @@ describe WikiPage do
         WikiDirectory.new('dir_2', pages)
       end
 
-      it 'returns an array with pages and directories' do
-        expected_grouped_entries = [page_1, dir_1, dir_1_1, dir_2]
+      context 'sort by title' do
+        let(:grouped_entries) { described_class.group_by_directory(wiki.pages) }
+        let(:expected_grouped_entries) { [dir_1_1, dir_1, dir_2, page_1, page_6] }
 
-        grouped_entries = described_class.group_by_directory(wiki.pages)
+        it 'returns an array with pages and directories' do
+          grouped_entries.each_with_index do |page_or_dir, i|
+            expected_page_or_dir = expected_grouped_entries[i]
+            expected_slugs = get_slugs(expected_page_or_dir)
+            slugs = get_slugs(page_or_dir)
 
-        grouped_entries.each_with_index do |page_or_dir, i|
-          expected_page_or_dir = expected_grouped_entries[i]
-          expected_slugs = get_slugs(expected_page_or_dir)
-          slugs = get_slugs(page_or_dir)
+            expect(slugs).to match_array(expected_slugs)
+          end
+        end
+      end
+
+      context 'sort by created_at' do
+        let(:grouped_entries) { described_class.group_by_directory(wiki.pages(sort: 'created_at')) }
+        let(:expected_grouped_entries) { [dir_1_1, page_1, dir_1, dir_2, page_6] }
 
-          expect(slugs).to match_array(expected_slugs)
+        it 'returns an array with pages and directories' do
+          grouped_entries.each_with_index do |page_or_dir, i|
+            expected_page_or_dir = expected_grouped_entries[i]
+            expected_slugs = get_slugs(expected_page_or_dir)
+            slugs = get_slugs(page_or_dir)
+
+            expect(slugs).to match_array(expected_slugs)
+          end
         end
       end
 
-      it 'returns an array sorted by alphabetical position' do
-        # Directories and pages within directories are sorted alphabetically.
-        # Pages at root come before everything.
-        expected_order = ['page_1', 'dir_1/page_2', 'dir_1/dir_1_1/page_3',
-                          'dir_2/page_4', 'dir_2/page_5']
+      it 'returns an array with retained order with directories at the top' do
+        expected_order = ['dir_1/dir_1_1/page_3', 'dir_1/page_2', 'dir_2/page_4', 'dir_2/page_5', 'page_1', 'page_6']
 
         grouped_entries = described_class.group_by_directory(wiki.pages)