Merge branch 'header-anchors' of github.com:cirosantilli/gitlab-elearn into...

Merge branch 'header-anchors' of github.com:cirosantilli/gitlab-elearn into cirosantilli-header-anchors
Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

Conflicts:
	CHANGELOG

CHANGELOG

@@ -14,6 +14,7 @@ v 6.6.0
   - Fix block/remove UI for admin::users#show page
   - Show users' group membership on users' activity page
   - User pages are visible without login if user is authorized to a public project
+  - Markdown rendered headers have id derived from their name and link to their id
 
 v 6.5.1
   - Fix branch selectbox when create merge request from fork

app/assets/stylesheets/generic/files.scss

@@ -50,7 +50,6 @@
     }
 
     &.wiki {
-      padding: 20px;
       font-size: 14px;
       line-height: 1.6;
 

app/assets/stylesheets/generic/issue_box.scss

@@ -23,11 +23,12 @@
     line-height: 28px;
     margin: 0;
     color: #444;
+    border-bottom: 1px solid #eee;
   }
 
   .context {
     border: none;
-    border-top: 1px solid #eee;
+    border-bottom: 1px solid #eee;
   }
 
   .description {
@@ -35,7 +36,7 @@
   }
 
   .title, .context, .description {
-    padding: 15px;
+    padding: 15px 15px 15px 30px;
 
     .clearfix {
       margin: 0;

app/assets/stylesheets/generic/typography.scss

@@ -90,6 +90,27 @@ a:focus {
 
   font-size: 14px;
   line-height: 1.6;
+
+  /* Link to current header. */
+  h1, h2, h3, h4, h5, h6 {
+    position: relative;
+    &:hover > :last-child {
+      $size: 16px;
+      position: absolute;
+      right: 100%;
+      top: 50%;
+      margin-top: -$size/2;
+      margin-right: 0px;
+      padding-right: 20px;
+      display: inline-block;
+      width: $size;
+      height: $size;
+      background-image: url("icon-link.png");
+      background-size: contain;
+      background-repeat: no-repeat;
+    }
+  }
+
   ul {
     padding: 0;
     margin: 0 0 9px 25px !important;

app/assets/stylesheets/main/mixins.scss

@@ -114,6 +114,10 @@
     font-size: 1.2em;
   }
 
+  // Larger 30px left margin is required for the header link icon.
+  // Use on all markdown including those without header links for uniformity.
+  margin: 20px 20px 20px 30px;
+
   blockquote p {
     color: #888;
     font-size: 14px;

app/helpers/gitlab_markdown_helper.rb

@@ -28,14 +28,16 @@ module GitlabMarkdownHelper
     link_to(gfm_body.html_safe, url, html_options)
   end
 
-  def markdown(text)
-    unless @markdown
-      gitlab_renderer = Redcarpet::Render::GitlabHTML.new(self,
-                          # see https://github.com/vmg/redcarpet#darling-i-packed-you-a-couple-renderers-for-lunch-
-                          filter_html: true,
-                          with_toc_data: true,
-                          hard_wrap: true,
-                          safe_links_only: true)
+  def markdown(text, options={})
+    unless (@markdown and options == @options)
+      @options = options
+      gitlab_renderer = Redcarpet::Render::GitlabHTML.new(self, {
+                            # see https://github.com/vmg/redcarpet#darling-i-packed-you-a-couple-renderers-for-lunch-
+                            filter_html: true,
+                            with_toc_data: true,
+                            hard_wrap: true,
+                            safe_links_only: true
+                          }.merge(options))
       @markdown = Redcarpet::Markdown.new(gitlab_renderer,
                       # see https://github.com/vmg/redcarpet#and-its-like-really-simple-to-use
                       no_intra_emphasis: true,
@@ -47,7 +49,6 @@ module GitlabMarkdownHelper
                       space_after_headers: true,
                       superscript: true)
     end
-
     @markdown.render(text).html_safe
   end
 

app/views/help/_layout.html.haml

@@ -8,4 +8,5 @@
           = link_to title, path
 
   .col-md-9
-    = yield
+    .wiki
+      = yield

app/views/projects/issues/show.html.haml

@@ -46,10 +46,9 @@
       = render partial: 'issue_context', locals: { issue: @issue }
 
   - if @issue.description.present?
-    .description
-      .wiki
-        = preserve do
-          = markdown @issue.description
+    .wiki
+      = preserve do
+        = markdown @issue.description
 
 - content_for :note_actions do
   - if can?(current_user, :modify_issue, @issue)

app/views/projects/merge_requests/show/_mr_box.html.haml

@@ -15,10 +15,9 @@
 
 
   - if @merge_request.description.present?
-    .description
-      .wiki
-        = preserve do
-          = markdown @merge_request.description
+    .wiki
+      = preserve do
+        = markdown @merge_request.description
 
   - if @merge_request.closed?
     .description.alert-danger

app/views/projects/milestones/show.html.haml

@@ -42,13 +42,11 @@
     .progress.progress-info
       .progress-bar{style: "width: #{@milestone.percent_complete}%;"}
 
-
   - if @milestone.description.present?
-    .description
+    .wiki
       = preserve do
         = markdown @milestone.description
 
-
 %ul.nav.nav-tabs.append-bottom-10
   %li.active
     = link_to '#tab-issues', 'data-toggle' => 'tab' do

app/views/projects/notes/_note.html.haml

@@ -31,7 +31,7 @@
   .note-body
     .note-text
       = preserve do
-        = markdown(note.note)
+        = markdown(note.note, {no_header_anchors: true})
 
     .note-edit-form
       = form_for note, url: project_note_path(@project, note), method: :put, remote: true, authenticity_token: true do |f|

doc/markdown/markdown.md

 ----------------------------------------------
 
-Table of Contents  
+Table of Contents
 =================
 
 ----------------------------------------------
 
-[GitLab Flavored Markdown](#toc_3)
--------------------------------
-[Newlines](#toc_4)
-[Multiple underscores in words](#toc_5)
-[URL autolinking](#toc_6)
-[Code and Syntax Highlighting](#toc_7)
-[Emoji](#toc_8)
-[Special GitLab references](#toc_9)
-
-
-
-[Standard Markdown](#toc_10)
-------------------------------
-[Headers](#toc_11)
-[Emphasis](#toc_20)
-[Lists](#toc_21)
-[Links](#toc_22)
-[Images](#toc_23)
-[Blockquotes](#toc_24)
-[Inline HTML](#toc_25)
-[Horizontal Rule](#toc_26)
-[Line Breaks](#toc_27)
-[Tables](#toc_28)
-
-[References](#toc_29)
----------------------
+**[GitLab Flavored Markdown](#gitlab-flavored-markdown-gfm)**
+
+[Newlines](#newlines)
+[Multiple underscores in words](#multiple-underscores-in-words)
+[URL autolinking](#url-autolinking)
+[Code and Syntax Highlighting](#code-and-syntax-highlighting)
+[Emoji](#emoji)
+[Special GitLab references](#special-gitlab-references)
+
+**[Standard Markdown](#standard-markdown)**
+
+[Headers](#headers)
+[Emphasis](#emphasis)
+[Lists](#lists)
+[Links](#links)
+[Images](#images)
+[Blockquotes](#blockquotes)
+[Inline HTML](#inline-html)
+[Horizontal Rule](#horizontal-rule)
+[Line Breaks](#line-breaks)
+[Tables](#tables)
+
+**[References](#references)**
 
 ----------------------------------------------
 
-<a name="gfm" />
-GitLab Flavored Markdown (GFM) 
+GitLab Flavored Markdown (GFM)
 ==============================
 For GitLab we developed something we call "GitLab Flavored Markdown" (GFM). It extends the standard Markdown in a few significant ways to add some useful functionality.
 
@@ -49,7 +45,6 @@ You can use GFM in
 * milestones
 * wiki pages
 
-<a name="newlines" />
 Newlines
 --------
 The biggest difference that GFM introduces is in the handling of linebreaks. With traditional Markdown you can hard wrap paragraphs of text and they will be combined into a single paragraph. We find this to be the cause of a huge number of unintentional formatting errors. GFM treats newlines in paragraph-like content as real line breaks, which is probably what you intended.
@@ -61,8 +56,7 @@ The next paragraph contains two phrases separated by a single newline character:
 
 Roses are red
 Violets are blue
-    
-<a name="underscores" />
+
 Multiple underscores in words
 -----------------------------
 It is not reasonable to italicize just _part_ of a word, especially when you're dealing with code and names that often appear with multiple underscores. Therefore, GFM ignores multiple underscores in words.
@@ -73,7 +67,6 @@ It is not reasonable to italicize just _part_ of a word, especially when you're
 perform_complicated_task
 do_this_and_do_that_and_another_thing
 
-<a name="autolink" />
 URL autolinking
 ---------------
 GFM will autolink standard URLs you copy and paste into your text.
@@ -83,12 +76,10 @@ So if you want to link to a URL (instead of a textural link), you can simply put
 
 http://www.google.com
 
-<a name="code"/>
 ## Code and Syntax Highlighting
 
 Blocks of code are either fenced by lines with three back-ticks <code>```</code>, or are indented with four spaces. Only the fenced code blocks support syntax highlighting.
 
-
 ```no-highlight
 Inline `code` has `back-ticks around` it.
 ```
@@ -101,14 +92,14 @@ Example:
     var s = "JavaScript syntax highlighting";
     alert(s);
     ```
-         
+
     ```python
     def function():
         #indenting works just fine in the fenced code block
         s = "Python syntax highlighting"
         print s
     ```
-         
+
     ```ruby
     require 'redcarpet'
     markdown = Redcarpet.new("Hello World!")
@@ -116,7 +107,7 @@ Example:
     ```
 
     ```
-    No language indicated, so no syntax highlighting. 
+    No language indicated, so no syntax highlighting.
     s = "There is no highlighting for this."
     But let's throw in a <b>tag</b>.
     ```
@@ -147,7 +138,6 @@ s = "There is no highlighting for this."
 But let's throw in a <b>tag</b>.
 ```
 
-<a name="emoji"/>
 Emoji
 -----
 
@@ -159,7 +149,7 @@ Emoji
 
 	If you are :new: to this, don't be :fearful:. You can easily join the emoji :circus_tent:. All you need to do is to :book: up on the supported codes.
 
-	Consult the [Emoji Cheat Sheet](http://www.emoji-cheat-sheet.com/) for a list of all supported emoji codes. :thumbsup: 
+	Consult the [Emoji Cheat Sheet](http://www.emoji-cheat-sheet.com/) for a list of all supported emoji codes. :thumbsup:
 
 Sometimes you want to be :cool: and add some :sparkles: to your :speech_balloon:. Well we have a :gift: for you:
 
@@ -169,9 +159,8 @@ You can use it to point out a :bug: or warn about :monkey:patches. And if someon
 
 If you are :new: to this, don't be :fearful:. You can easily join the emoji :circus_tent:. All you need to do is to :book: up on the supported codes.
 
-Consult the [Emoji Cheat Sheet](http://www.emoji-cheat-sheet.com/) for a list of all supported emoji codes. :thumbsup: 
+Consult the [Emoji Cheat Sheet](http://www.emoji-cheat-sheet.com/) for a list of all supported emoji codes. :thumbsup:
 
-<a name="special"/>
 Special GitLab References
 -----
 
@@ -179,7 +168,6 @@ GFM recognized special references.
 You can easily reference e.g. a team member, an issue, or a commit within a project.
 GFM will turn that reference into a link so you can navigate between them easily.
 
-
 GFM will recognize the following:
 
 * @foo : for team members
@@ -189,13 +177,10 @@ GFM will recognize the following:
 * 1234567 : for commits
 * \[file\](path/to/file) : for file references
 
-<a name="standard"/>
-
 ----------------------------------
 # Standard Markdown
 
 ----------------------------------
-<a name="headers"/>
 ## Headers
 
 ```no-highlight
@@ -230,7 +215,54 @@ Alt-H1
 Alt-H2
 ------
 
-<a name="emphasis"/>
+### Header IDs and links
+
+All markdown rendered headers automatically get IDs, except for comments.
+
+On hover a link to those IDs becomes visible to make it easier to copy the link to the header to give it to someone else.
+
+The IDs are generated from the content of the header according to the following rules:
+
+1) remove the heading hashes `#` and process the rest of the line as it would be processed if it were not a header
+2) from the result, remove all HTML tags, but keep their inner content
+3) convert all characters to lowercase
+4) convert all characters except `[a-z0-9_-]` into hyphens `-`
+5) transform multiple adjacent hyphens into a single hyphen
+6) remove trailing and heading hyphens
+
+For example:
+
+```
+###### ..Ab_c-d. e [anchor](url) ![alt text](url)..
+```
+
+which renders as:
+
+###### ..Ab_c-d. e [anchor](url) ![alt text](url)..
+
+will first be converted by step 1) into a string like:
+
+```
+..Ab_c-d. e &lt;a href="url">anchor&lt;/a> &lt;img src="url" alt="alt text"/>..
+```
+
+After removing the tags in step 2) we get:
+
+```
+..Ab_c-d. e anchor ..
+```
+
+And applying all the other steps gives the id:
+
+```
+ab_c-d-e-anchor
+```
+
+Note in particular how:
+
+- for markdown anchors `[text](url)`, only the `text` is used
+- markdown images `![alt](url)` are completely ignored
+
 ## Emphasis
 
 ```no-highlight
@@ -251,18 +283,16 @@ Combined emphasis with **asterisks and _underscores_**.
 
 Strikethrough uses two tildes. ~~Scratch this.~~
 
-
-<a name="lists"/>
 ## Lists
 
 ```no-highlight
 1. First ordered list item
 2. Another item
-  * Unordered sub-list. 
+  * Unordered sub-list.
 1. Actual numbers don't matter, just that it's a number
   1. Ordered sub-list
-4. And another item.  
-   
+4. And another item.
+
    Some text that should be aligned with the above item.
 
 * Unordered list can use asterisks
@@ -272,18 +302,17 @@ Strikethrough uses two tildes. ~~Scratch this.~~
 
 1. First ordered list item
 2. Another item
-  * Unordered sub-list. 
+  * Unordered sub-list.
 1. Actual numbers don't matter, just that it's a number
   1. Ordered sub-list
-4. And another item.  
-   
+4. And another item.
+
    Some text that should be aligned with the above item.
 
 * Unordered list can use asterisks
 - Or minuses
 + Or pluses
 
-<a name="links"/>
 ## Links
 
 There are two ways to create links.
@@ -320,30 +349,28 @@ Some text to show that the reference links can follow later.
 [1]: http://slashdot.org
 [link text itself]: http://www.reddit.com
 
-<a name="images"/>
 ## Images
 
     Here's our logo (hover to see the title text):
 
-    Inline-style: 
+    Inline-style:
     ![alt text](assets/logo-white.png)
 
-    Reference-style: 
+    Reference-style:
     ![alt text1][logo]
 
     [logo]: assets/logo-white.png
 
 Here's our logo (hover to see the title text):
 
-Inline-style: 
+Inline-style:
 ![alt text](/assets/logo-white.png "Logo Title Text 1")
 
-Reference-style: 
+Reference-style:
 ![alt text][logo]
 
 [logo]: /assets/logo-white.png "Logo Title Text 2"
 
-<a name="blockquotes"/>
 ## Blockquotes
 
 ```no-highlight
@@ -352,7 +379,7 @@ Reference-style:
 
 Quote break.
 
-> This is a very long line that will still be quoted properly when it wraps. Oh boy let's keep writing to make sure this is long enough to actually wrap for everyone. Oh, you can *put* **Markdown** into a blockquote. 
+> This is a very long line that will still be quoted properly when it wraps. Oh boy let's keep writing to make sure this is long enough to actually wrap for everyone. Oh, you can *put* **Markdown** into a blockquote.
 ```
 
 > Blockquotes are very handy in email to emulate reply text.
@@ -360,12 +387,11 @@ Quote break.
 
 Quote break.
 
-> This is a very long line that will still be quoted properly when it wraps. Oh boy let's keep writing to make sure this is long enough to actually wrap for everyone. Oh, you can *put* **Markdown** into a blockquote. 
+> This is a very long line that will still be quoted properly when it wraps. Oh boy let's keep writing to make sure this is long enough to actually wrap for everyone. Oh, you can *put* **Markdown** into a blockquote.
 
-<a name="html"/>
 ## Inline HTML
 
-You can also use raw HTML in your Markdown, and it'll mostly work pretty well. 
+You can also use raw HTML in your Markdown, and it'll mostly work pretty well.
 
 ```no-highlight
 <dl>
@@ -385,7 +411,6 @@ You can also use raw HTML in your Markdown, and it'll mostly work pretty well.
   <dd>Does *not* work **very** well. Use HTML <em>tags</em>.</dd>
 </dl>
 
-<a name="hr"/>
 ## Horizontal Rule
 
 ```
@@ -418,10 +443,9 @@ ___
 
 Underscores
 
-<a name="lines"/>
 ## Line Breaks
 
-My basic recommendation for learning how line breaks work is to experiment and discover -- hit &lt;Enter&gt; once (i.e., insert one newline), then hit it twice (i.e., insert two newlines), see what happens. You'll soon learn to get what you want. "Markdown Toggle" is your friend. 
+My basic recommendation for learning how line breaks work is to experiment and discover -- hit &lt;Enter&gt; once (i.e., insert one newline), then hit it twice (i.e., insert two newlines), see what happens. You'll soon learn to get what you want. "Markdown Toggle" is your friend.
 
 Here are some things to try out:
 
@@ -438,11 +462,9 @@ Here's a line for us to start with.
 
 This line is separated from the one above by two newlines, so it will be a *separate paragraph*.
 
-This line is also begins a separate paragraph, but...  
+This line is also begins a separate paragraph, but...
 This line is only separated by a single newline, so it's a separate line in the *same paragraph*.
 
-
-<a name="tables"/>
 ## Tables
 
 Tables aren't part of the core Markdown spec, but they are part of GFM and Markdown Here supports them.
@@ -461,10 +483,8 @@ Code above produces next output:
 | cell 1   | cell 2   |
 | cell 3   | cell 4   |
 
-
 ------------
 
-<a name="references"/>
 ## References
 
 * This document leveraged heavily from the [Markdown-Cheatsheet](https://github.com/adam-p/markdown-here/wiki/Markdown-Cheatsheet).

features/dashboard/help.feature

+Feature: Help
+  Background:
+    Given I sign in as a user
+    And I visit the "Rake Tasks" help page
+
+  Scenario: The markdown should be rendered correctly
+    Then I should see "Rake Tasks" page markdown rendered
+    And Header "Rebuild project satellites" should have correct ids and links

features/project/issues/issues.feature

@@ -55,3 +55,15 @@ Feature: Project Issues
     And I fill in issue search with ".3"
     Then I should see "Release 0.3" in issues
     And I should not see "Release 0.4" in issues
+
+  # Markdown
+
+  Scenario: Headers inside the description should have ids generated for them.
+    Given I visit issue page "Release 0.4"
+    Then Header "Description header" should have correct id and link
+
+  @javascript
+  Scenario: Headers inside comments should not have ids generated for them.
+    Given I visit issue page "Release 0.4"
+    And I leave a comment with a header containing "Comment with a header"
+    Then The comment with the header should not have an ID

features/project/issues/milestones.feature

@@ -22,3 +22,9 @@ Feature: Project Milestones
     Given the milestone has open and closed issues
     And I click link "v2.2"
     Then I should see 3 issues
+
+  # Markdown
+
+  Scenario: Headers inside the description should have ids generated for them.
+    Given I click link "v2.2"
+    Then Header "Description header" should have correct id and link

features/project/merge_requests.feature

@@ -77,3 +77,15 @@ Feature: Project Merge Requests
     Then I modify merge commit message
     And I accept this merge request
     Then I should see merged request
+
+  # Markdown
+
+  Scenario: Headers inside the description should have ids generated for them.
+    When I visit merge request page "Bug NS-04"
+    Then Header "Description header" should have correct id and link
+
+  @javascript
+  Scenario: Headers inside comments should not have ids generated for them.
+    Given I visit merge request page "Bug NS-04"
+    And I leave a comment with a header containing "Comment with a header"
+    Then The comment with the header should not have an ID

features/project/source/markdown_render.feature

@@ -4,6 +4,15 @@ Feature: Project markdown render
     And I own project "Delta"
     Given I visit project source page
 
+  # -------------------------------------------
+  # README
+  # -------------------------------------------
+
+  Scenario: Tree view should have correct links in README
+    Given I go directory which contains README file
+    And I click on a relative link in README
+    Then I should see the correct markdown
+
   Scenario: I browse files from master branch
     Then I should see files from repository in master
     And I should see rendered README which contains correct links
@@ -28,6 +37,14 @@ Feature: Project markdown render
     And I click on Maintenance in README
     Then I should see correct maintenance file rendered
 
+  Scenario: README headers should have header links
+    Then I should see rendered README which contains correct links
+    And Header "Application details" should have correct id and link
+
+  # -------------------------------------------
+  # File content
+  # -------------------------------------------
+
   Scenario: I navigate to doc directory to view documentation in master
     And I navigate to the doc/api/README
     And I see correct file rendered
@@ -40,6 +57,14 @@ Feature: Project markdown render
     And I click on raketasks in doc/api/README
     Then I should see correct directory rendered
 
+  Scenario: I navigate to doc directory to view user doc in master
+    And I navigate to the doc/api/README
+    And Header "GitLab API" should have correct id and link
+
+  # -------------------------------------------
+  # Markdown branch README
+  # -------------------------------------------
+
   Scenario: I browse files from markdown branch
     When I visit markdown branch
     Then I should see files from repository in markdown branch
@@ -68,6 +93,10 @@ Feature: Project markdown render
     And I click on raketasks in doc/api/README
     Then I should see correct directory rendered for markdown branch
 
+  # -------------------------------------------
+  # Wiki
+  # -------------------------------------------
+
   Scenario: I create a wiki page with different links
     Given I go to wiki page
     And I add various links to the wiki page
@@ -81,12 +110,7 @@ Feature: Project markdown render
     And I click on Rake tasks link
     Then I see Rake tasks directory
 
-  Scenario: I visit the help page with markdown
-    Given I visit to the help page
-    And I select a page with markdown
-    Then I should see a help page with markdown
-
-  Scenario: Tree view should have correct links in README
-    Given I go directory which contains README file
-    And I click on a relative link in README
-    Then I should see the correct markdown
+  Scenario: Wiki headers should have should have ids generated for them.
+    Given I go to wiki page
+    And I add a header to the wiki page
+    Then Wiki header should have correct id and link

features/steps/help.rb

+class Spinach::Features::Help < Spinach::FeatureSteps
+  include SharedAuthentication
+  include SharedPaths
+  include SharedMarkdown
+
+  step 'I visit the help page' do
+    visit help_path
+  end
+
+  step 'I visit the "Rake Tasks" help page' do
+    visit help_raketasks_path
+  end
+
+  step 'I should see "Rake Tasks" page markdown rendered' do
+    page.should have_content "GitLab provides some specific rake tasks to enable special features or perform maintenance tasks"
+  end
+
+  step 'Header "Rebuild project satellites" should have correct ids and links' do
+    header_should_have_correct_id_and_link(3, 'Rebuild project satellites', 'rebuild-project-satellites')
+  end
+end

features/steps/project/project_issues.rb

@@ -3,6 +3,7 @@ class ProjectIssues < Spinach::FeatureSteps
   include SharedProject
   include SharedNote
   include SharedPaths
+  include SharedMarkdown
 
   Given 'I should see "Release 0.4" in issues' do
     page.should have_content "Release 0.4"
@@ -121,7 +122,9 @@ class ProjectIssues < Spinach::FeatureSteps
     create(:issue,
            title: "Release 0.4",
            project: project,
-           author: project.users.first)
+           author: project.users.first,
+           description: "# Description header"
+          )
   end
 
   And 'project "Shop" have "Tweet control" open issue' do

features/steps/project/project_markdown_render.rb

 class Spinach::Features::ProjectMarkdownRender < Spinach::FeatureSteps
   include SharedAuthentication
   include SharedPaths
+  include SharedMarkdown
 
   And 'I own project "Delta"' do
     @project = Project.find_by(name: "Delta")
@@ -44,7 +45,6 @@ class Spinach::Features::ProjectMarkdownRender < Spinach::FeatureSteps
     page.should have_content "maintenance.md"
   end
 
-
   And 'I click on GitLab API doc directory in README' do
     click_link "GitLab API doc directory"
   end
@@ -140,6 +140,16 @@ class Spinach::Features::ProjectMarkdownRender < Spinach::FeatureSteps
     page.should have_content "test GitLab API doc Rake tasks"
   end
 
+  step 'I add a header to the wiki page' do
+    fill_in "wiki[content]", with: "# Wiki header\n"
+    fill_in "wiki[message]", with: "Add header to wiki"
+    click_button "Create page"
+  end
+
+  step 'Wiki header should have correct id and link' do
+    header_should_have_correct_id_and_link(1, 'Wiki header', 'wiki-header')
+  end
+
   And 'I click on test link' do
     click_link "test"
   end
@@ -173,18 +183,6 @@ class Spinach::Features::ProjectMarkdownRender < Spinach::FeatureSteps
     page.should have_content "maintenance.md"
   end
 
-  Given 'I visit to the help page' do
-    visit help_path
-  end
-
-  And 'I select a page with markdown' do
-    click_link "Rake Tasks"
-  end
-
-  Then 'I should see a help page with markdown' do
-    page.should have_content "GitLab provides some specific rake tasks to enable special features or perform maintenance tasks"
-  end
-
   Given 'I go directory which contains README file' do
     visit project_tree_path(@project, "master/doc/api")
     current_path.should == project_tree_path(@project, "master/doc/api")
@@ -198,4 +196,12 @@ class Spinach::Features::ProjectMarkdownRender < Spinach::FeatureSteps
     current_path.should == project_blob_path(@project, "master/doc/api/users.md")
     page.should have_content "List users"
   end
+
+  step 'Header "Application details" should have correct id and link' do
+    header_should_have_correct_id_and_link(2, 'Application details', 'application-details')
+  end
+
+  step 'Header "GitLab API" should have correct id and link' do
+    header_should_have_correct_id_and_link(1, 'GitLab API', 'gitlab-api')
+  end
 end

features/steps/project/project_merge_requests.rb

@@ -3,6 +3,7 @@ class ProjectMergeRequests < Spinach::FeatureSteps
   include SharedProject
   include SharedNote
   include SharedPaths
+  include SharedMarkdown
 
   step 'I click link "New Merge Request"' do
     click_link "New Merge Request"
@@ -83,7 +84,9 @@ class ProjectMergeRequests < Spinach::FeatureSteps
            target_project: project,
            source_branch: 'stable',
            target_branch: 'master',
-           author: project.users.first)
+           author: project.users.first,
+           description: "# Description header"
+          )
   end
 
   step 'project "Shop" have "Bug NS-05" open merge request with diffs inside' do

features/steps/project/project_milestones.rb

@@ -2,6 +2,7 @@ class ProjectMilestones < Spinach::FeatureSteps
   include SharedAuthentication
   include SharedProject
   include SharedPaths
+  include SharedMarkdown
 
   Then 'I should see milestone "v2.2"' do
     milestone = @project.milestones.find_by(title: "v2.2")
@@ -32,8 +33,11 @@ class ProjectMilestones < Spinach::FeatureSteps
 
   And 'project "Shop" has milestone "v2.2"' do
     project = Project.find_by(name: "Shop")
-    milestone = create(:milestone, title: "v2.2", project: project)
-
+    milestone = create(:milestone,
+                       title: "v2.2",
+                       project: project,
+                       description: "# Description header"
+                      )
     3.times { create(:issue, project: project, milestone: milestone) }
   end
 

features/steps/shared/markdown.rb

+module SharedMarkdown
+  include Spinach::DSL
+
+  def header_should_have_correct_id_and_link(level, text, id, parent = ".wiki")
+    page.find(:css, "#{parent} h#{level}##{id}").text.should == text
+    page.find(:css, "#{parent} h#{level}##{id} > :last-child")[:href].should =~ /##{id}$/
+  end
+
+  step 'Header "Description header" should have correct id and link' do
+    header_should_have_correct_id_and_link(1, 'Description header', 'description-header')
+  end
+end

features/steps/shared/note.rb

@@ -102,4 +102,21 @@ module SharedNote
       page.should have_content("XML attached")
     end
   end
+
+  # Markdown
+
+  step 'I leave a comment with a header containing "Comment with a header"' do
+    within(".js-main-target-form") do
+      fill_in "note[note]", with: "# Comment with a header"
+      click_button "Add Comment"
+      sleep 0.05
+    end
+  end
+
+  step 'The comment with the header should not have an ID' do
+    within(".note-text") do
+      page.should     have_content("Comment with a header")
+      page.should_not have_css("#comment-with-a-header")
+    end
+  end
 end

lib/redcarpet/render/gitlab_html.rb

@@ -8,6 +8,7 @@ class Redcarpet::Render::GitlabHTML < Redcarpet::Render::HTML
     @project = @template.instance_variable_get("@project")
     @ref = @template.instance_variable_get("@ref")
     @request_path = @template.instance_variable_get("@path")
+    @options = options.dup
     super options
   end
 
@@ -34,6 +35,16 @@ class Redcarpet::Render::GitlabHTML < Redcarpet::Render::HTML
     h.link_to_gfm(content, link, title: title)
   end
 
+  def header(text, level)
+    if @options[:no_header_anchors]
+      "<h#{level}>#{text}</h#{level}>"
+    else
+      id = ActionController::Base.helpers.strip_tags(h.gfm(text)).downcase() \
+          .gsub(/[^a-z0-9_-]/, '-').gsub(/-+/, '-').gsub(/^-/, '').gsub(/-$/, '')
+      "<h#{level} id=\"#{id}\">#{text}<a href=\"\##{id}\"></a></h#{level}>"
+    end
+  end
+
   def preprocess(full_document)
     if @project
       h.create_relative_links(full_document, @project, @ref, @request_path, is_wiki?)

spec/helpers/gitlab_markdown_helper_spec.rb

@@ -348,8 +348,21 @@ describe GitlabMarkdownHelper do
     it "should handle references in headers" do
       actual = "\n# Working around ##{issue.iid}\n## Apply !#{merge_request.iid}"
 
-      markdown(actual).should match(%r{<h1[^<]*>Working around <a.+>##{issue.iid}</a></h1>})
-      markdown(actual).should match(%r{<h2[^<]*>Apply <a.+>!#{merge_request.iid}</a></h2>})
+      markdown(actual, {no_header_anchors:true}).should match(%r{<h1[^<]*>Working around <a.+>##{issue.iid}</a></h1>})
+      markdown(actual, {no_header_anchors:true}).should match(%r{<h2[^<]*>Apply <a.+>!#{merge_request.iid}</a></h2>})
+    end
+
+    it "should add ids and links to headers" do
+      # Test every rule except nested tags.
+      text = '..Ab_c-d. e..'
+      id = 'ab_c-d-e'
+      markdown("# #{text}").should match(%r{<h1 id="#{id}">#{text}<a href="[^"]*##{id}"></a></h1>})
+      markdown("# #{text}", {no_header_anchors:true}).should == "<h1>#{text}</h1>"
+
+      id = 'link-text'
+      markdown("# [link text](url) ![img alt](url)").should match(
+        %r{<h1 id="#{id}"><a href="[^"]*url">link text</a> <img[^>]*><a href="[^"]*##{id}"></a></h1>}
+      )
     end
 
     it "should handle references in lists" do