# GitLab Markdown

This document is intended to be a comprehensive example of custom GitLab
Markdown usage. It will be parsed and then tested for accuracy. Let's get
started.

## Markdown

GitLab uses [Redcarpet](http://git.io/ld_NVQ) to parse all Markdown into
HTML.

It has some special features. Let's try 'em out!

### No Intra Emphasis

This string should have no emphasis: foo_bar_baz

### Tables

| Header   | Row  | Example |
| :------: | ---: | :------ |
| Foo      | Bar  | **Baz** |

### Fenced Code Blocks

```c
#include<stdio.h>

main()
{
    printf("Hello World");

}
```

```python
print "Hello, World!"
```

### Strikethrough

This text says this, ~~and this text doesn't~~.

### Superscript

This is my 1^(st) time using superscript in Markdown. Now this is my
2^(nd).

### Next step

After the Markdown has been turned into HTML, it gets passed through...

## HTML::Pipeline

### SanitizationFilter

GitLab uses <a href="http://git.io/vfW8a">HTML::Pipeline::SanitizationFilter</a>
to sanitize the generated HTML, stripping dangerous or unwanted tags.

Its default whitelist is pretty permissive. Check it:

<b>b tag</b> and <em>em tag</em>.

<code>code tag</code>

Press <kbd>s</kbd> to search.

<strike>Emoji</strike> Plain old images! <img src="http://www.emoji-cheat-sheet.com/graphics/emojis/smile.png" width="20" height="20" />

Here comes a line break:

<br />

And a horizontal rule:

<hr />

As permissive as it is, we've allowed even more stuff:

<span>span tag</span>

<a href="#" rel="bookmark">This is a link with a defined rel attribute, which should be removed</a>

<a href="javascript:alert('Hi')">This is a link trying to be sneaky. It gets its link removed entirely.</a>

### Escaping

The problem with SanitizationFilter is that it can be too aggressive.

| Input       | Expected         | Actual    |
| ----------- | ---------------- | --------- |
| `1 < 3 & 5` | 1 &lt; 3 &amp; 5 | 1 < 3 & 5 |
| `<foo>`     | &lt;foo&gt;      | <foo>     |

### Edge Cases

Markdown should be usable inside a link. Let's try!

- [_text_](#link-emphasis)
- [**text**](#link-strong)
- [`text`](#link-code)

### EmojiFilter

Because life would be :zzz: without Emoji, right? :rocket:

Get ready for the Emoji :bomb:: :+1::-1::ok_hand::wave::v::raised_hand::muscle:

### TableOfContentsFilter

All headers in this document should be linkable. Try it.

### AutolinkFilter

These are all plain text that should get turned into links:

- http://about.gitlab.com/
- https://google.com/
- ftp://ftp.us.debian.org/debian/
- smb://foo/bar/baz
- irc://irc.freenode.net/git
- http://localhost:3000

But it shouldn't autolink text inside certain tags:

- <code>http://about.gitlab.com/</code>
- <a>http://about.gitlab.com/</a>
- <kbd>http://about.gitlab.com/</kbd>

### ExternalLinkFilter

External links get a `rel="nofollow"` attribute:

- [Google](https://google.com/)
- [GitLab Root](<%= Gitlab.config.gitlab.url %>)

### Reference Filters (e.g., <%= issue.to_reference %>)

References should be parseable even inside _<%= merge_request.to_reference %>_ emphasis.

#### UserReferenceFilter

- All: @all
- User: <%= user.to_reference %>
- Group: <%= group.to_reference %>
- Ignores invalid: <%= User.reference_prefix %>fake_user
- Ignored in code: `<%= user.to_reference %>`
- Ignored in links: [Link to <%= user.to_reference %>](#user-link)

#### IssueReferenceFilter

- Issue: <%= issue.to_reference %>
- Issue in another project: <%= xissue.to_reference(project) %>
- Ignored in code: `<%= issue.to_reference %>`
- Ignored in links: [Link to <%= issue.to_reference %>](#issue-link)

#### MergeRequestReferenceFilter

- Merge request: <%= merge_request.to_reference %>
- Merge request in another project: <%= xmerge_request.to_reference(project) %>
- Ignored in code: `<%= merge_request.to_reference %>`
- Ignored in links: [Link to <%= merge_request.to_reference %>](#merge-request-link)

#### SnippetReferenceFilter

- Snippet: <%= snippet.to_reference %>
- Snippet in another project: <%= xsnippet.to_reference(project) %>
- Ignored in code: `<%= snippet.to_reference %>`
- Ignored in links: [Link to <%= snippet.to_reference %>](#snippet-link)

#### CommitRangeReferenceFilter

- Range: <%= commit_range.to_reference %>
- Range in another project: <%= xcommit_range.to_reference(project) %>
- Ignored in code: `<%= commit_range.to_reference %>`
- Ignored in links: [Link to <%= commit_range.to_reference %>](#commit-range-link)

#### CommitReferenceFilter

- Commit: <%= commit.to_reference %>
- Commit in another project: <%= xcommit.to_reference(project) %>
- Ignored in code: `<%= commit.to_reference %>`
- Ignored in links: [Link to <%= commit.to_reference %>](#commit-link)

#### LabelReferenceFilter

- Label by ID: <%= simple_label.to_reference %>
- Label by name: <%= Label.reference_prefix %><%= simple_label.name %>
- Label by name in quotes: <%= label.to_reference(:name) %>
- Ignored in code: `<%= simple_label.to_reference %>`
- Ignored in links: [Link to <%= simple_label.to_reference %>](#label-link)

### Task Lists

- [ ] Incomplete task 1
- [x] Complete task 1
- [ ] Incomplete task 2
  - [ ] Incomplete sub-task 1
  - [ ] Incomplete sub-task 2
  - [x] Complete sub-task 1
- [X] Complete task 2
