gitlab-org--gitlab-foss/doc/user/asciidoc.md

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# AsciiDoc
GitLab uses the [Asciidoctor](https://asciidoctor.org) gem to convert AsciiDoc content to HTML5.
Consult the [Asciidoctor User Manual](https://asciidoctor.org/docs/user-manual/) for a complete Asciidoctor reference.
## Syntax
Here's a brief reference of the most commonly used AsciiDoc syntax.
You can find the full documentation for the AsciiDoc syntax at <https://asciidoctor.org/docs/>.
### Paragraphs
```asciidoc
A normal paragraph.
Line breaks are not preserved.
```
Line comments, which are lines that start with `//`, are skipped:
```asciidoc
// this is a comment
```
A blank line separates paragraphs.
A paragraph with the `[%hardbreaks]` option will preserve line breaks:
```asciidoc
[%hardbreaks]
This paragraph carries the `hardbreaks` option.
Notice how line breaks are now preserved.
```
An indented (literal) paragraph disables text formatting,
preserves spaces and line breaks, and is displayed in a
monospaced font:
```asciidoc
This literal paragraph is indented with one space.
As a consequence, *text formatting*, spaces,
and lines breaks will be preserved.
```
An admonition paragraph grabs the reader's attention:
```asciidoc
NOTE: This is a brief reference, please read the full documentation at https://asciidoctor.org/docs/.
TIP: Lists can be indented. Leading whitespace is not significant.
```
### Text Formatting
**Constrained (applied at word boundaries)**
```asciidoc
*strong importance* (aka bold)
_stress emphasis_ (aka italic)
`monospaced` (aka typewriter text)
"`double`" and '`single`' typographic quotes
+passthrough text+ (substitutions disabled)
`+literal text+` (monospaced with substitutions disabled)
```
**Unconstrained (applied anywhere)**
```asciidoc
**C**reate+**R**ead+**U**pdate+**D**elete
fan__freakin__tastic
``mono``culture
```
**Replacements**
```asciidoc
A long time ago in a galaxy far, far away...
(C) 1976 Arty Artisan
I believe I shall--no, actually I won't.
```
**Macros**
```asciidoc
// where c=specialchars, q=quotes, a=attributes, r=replacements, m=macros, p=post_replacements, etc.
The European icon:flag[role=blue] is blue & contains pass:[************] arranged in a icon:circle-o[role=yellow].
The pass:c[->] operator is often referred to as the stabby lambda.
Since `pass:[++]` has strong priority in AsciiDoc, you can rewrite pass:c,a,r[C++ => C{pp}].
// activate stem support by adding `:stem:` to the document header
stem:[sqrt(4) = 2]
```
### Attributes
**User-defined attributes**
```asciidoc
// define attributes in the document header
:name: value
```
```asciidoc
:url-gem: https://rubygems.org/gems/asciidoctor
You can download and install Asciidoctor {asciidoctor-version} from {url-gem}.
C{pp} is not required, only Ruby.
Use a leading backslash to output a word enclosed in curly braces, like \{name}.
```
**Environment attributes**
GitLab sets the following environment attributes:
| Attribute | Description |
| :-------------- | :--------------------------------------------------------------------------------------------------------------------- |
| `docname` | Root name of the source document (no leading path or file extension). |
| `outfilesuffix` | File extension corresponding to the backend output (defaults to `.adoc` to make inter-document cross references work). |
### Links
```asciidoc
https://example.org/page[A webpage]
link:../path/to/file.txt[A local file]
xref:document.adoc[A sibling document]
mailto:hello@example.org[Email to say hello!]
```
### Anchors
```asciidoc
[[idname,reference text]]
// or written using normal block attributes as `[#idname,reftext=reference text]`
A paragraph (or any block) with an anchor (aka ID) and reftext.
See <<idname>> or <<idname,optional text of internal link>>.
xref:document.adoc#idname[Jumps to anchor in another document].
This paragraph has a footnote.footnote:[This is the text of the footnote.]
```
### Lists
#### Unordered
```asciidoc
* level 1
** level 2
*** level 3
**** level 4
***** etc.
* back at level 1
+
Attach a block or paragraph to a list item using a list continuation (which you can enclose in an open block).
.Some Authors
[circle]
- Edgar Allen Poe
- Sheri S. Tepper
- Bill Bryson
```
#### Ordered
```asciidoc
. Step 1
. Step 2
.. Step 2a
.. Step 2b
. Step 3
.Remember your Roman numerals?
[upperroman]
. is one
. is two
. is three
```
#### Checklist
```asciidoc
* [x] checked
* [ ] not checked
```
#### Callout
```asciidoc
// enable callout bubbles by adding `:icons: font` to the document header
[,ruby]
----
puts 'Hello, World!' # <1>
----
<1> Prints `Hello, World!` to the console.
```
#### Description
```asciidoc
first term:: description of first term
second term::
description of second term
```
### Document Structure
#### Header
```asciidoc
= Document Title
Author Name <author@example.org>
v1.0, 2019-01-01
```
#### Sections
```asciidoc
= Document Title (Level 0)
== Level 1
=== Level 2
==== Level 3
===== Level 4
====== Level 5
== Back at Level 1
```
#### Includes
```asciidoc
include::basics.adoc[]
// define -a allow-uri-read to allow content to be read from URI
include::https://example.org/installation.adoc[]
```
To guarantee good system performance and prevent malicious documents causing
problems, GitLab enforces a **maximum limit** on the number of include directives
processed in any one document. Currently a total of 32 documents can be
included, a number that is inclusive of transitive dependencies.
### Blocks
```asciidoc
--
open - a general-purpose content wrapper; useful for enclosing content to attach to a list item
--
```
```asciidoc
// recognized types include CAUTION, IMPORTANT, NOTE, TIP, and WARNING
// enable admonition icons by setting `:icons: font` in the document header
[NOTE]
====
admonition - a notice for the reader, ranging in severity from a tip to an alert
====
```
```asciidoc
====
example - a demonstration of the concept being documented
====
```
```asciidoc
.Toggle Me
[%collapsible]
====
collapsible - these details are revealed by clicking the title
====
```
```asciidoc
****
sidebar - auxiliary content that can be read independently of the main content
****
```
```asciidoc
....
literal - an exhibit that features program output
....
```
```asciidoc
----
listing - an exhibit that features program input, source code, or the contents of a file
----
```
```asciidoc
[,language]
----
source - a listing that is embellished with (colorized) syntax highlighting
----
```
````asciidoc
\```language
fenced code - a shorthand syntax for the source block
\```
````
```asciidoc
[,attribution,citetitle]
____
quote - a quotation or excerpt; attribution with title of source are optional
____
```
```asciidoc
[verse,attribution,citetitle]
____
verse - a literary excerpt, often a poem; attribution with title of source are optional
____
```
```asciidoc
++++
pass - content passed directly to the output document; often raw HTML
++++
```
```asciidoc
// activate stem support by adding `:stem:` to the document header
[stem]
++++
x = y^2
++++
```
```asciidoc
////
comment - content which is not included in the output document
////
```
### Tables
```asciidoc
.Table Attributes
[cols=>1h;2d,width=50%,frame=topbot]
|===
| Attribute Name | Values
| options
| header,footer,autowidth
| cols
| colspec[;colspec;...]
| grid
| all \| cols \| rows \| none
| frame
| all \| sides \| topbot \| none
| stripes
| all \| even \| odd \| none
| width
| (0%..100%)
| format
| psv {vbar} csv {vbar} dsv
|===
```
### Multimedia
```asciidoc
image::screenshot.png[block image,800,450]
Press image:reload.svg[reload,16,opts=interactive] to reload the page.
video::movie.mp4[width=640,start=60,end=140,options=autoplay]
video::aHjpOzsQ9YI[youtube]
video::300817511[vimeo]
```
### Breaks
```asciidoc
// thematic break (aka horizontal rule)
---
```
```asciidoc
// page break
<<<
```