1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
|
# Markdown
## Table of Contents
**[GitLab Flavored Markdown](#gitlab-flavored-markdown-gfm)**
* [Newlines](#newlines)
* [Multiple underscores in words](#multiple-underscores-in-words)
* [URL auto-linking](#url-auto-linking)
* [Code and Syntax Highlighting](#code-and-syntax-highlighting)
* [Inline Diff](#inline-diff)
* [Emoji](#emoji)
* [Special GitLab references](#special-gitlab-references)
* [Task lists](#task-lists)
**[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)**
## GitLab Flavored Markdown (GFM)
_GitLab uses the [Redcarpet Ruby library][redcarpet] for Markdown processing._
GitLab uses "GitLab Flavored Markdown" (GFM). It extends the standard Markdown in a few significant ways to add some useful functionality. It was inspired by [GitHub Flavored Markdown](https://help.github.com/articles/basic-writing-and-formatting-syntax/).
You can use GFM in
- comments
- issues
- merge requests
- milestones
- wiki pages
You can also use other rich text files in GitLab. You might have to install a dependency to do so. Please see the [github-markup gem readme](https://github.com/gitlabhq/markup#markups) for more information.
## Newlines
GFM honors the markdown specification in how [paragraphs and line breaks are handled](https://daringfireball.net/projects/markdown/syntax#p).
A paragraph is simply one or more consecutive lines of text, separated by one or more blank lines.
Line-breaks, or softreturns, are rendered if you end a line with two or more spaces
Roses are red [followed by two or more spaces]
Violets are blue
Sugar is sweet
Roses are red
Violets are blue
Sugar is sweet
## 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.
perform_complicated_task
do_this_and_do_that_and_another_thing
perform_complicated_task
do_this_and_do_that_and_another_thing
## URL auto-linking
GFM will autolink almost any URL you copy and paste into your text.
* https://www.google.com
* https://google.com/
* ftp://ftp.us.debian.org/debian/
* smb://foo/bar/baz
* irc://irc.freenode.net/gitlab
* http://localhost:3000
* https://www.google.com
* https://google.com/
* ftp://ftp.us.debian.org/debian/
* smb://foo/bar/baz
* irc://irc.freenode.net/gitlab
* http://localhost:3000
## Code and Syntax Highlighting
_GitLab uses the [Rouge Ruby library][rouge] for syntax highlighting. For a
list of supported languages visit the Rouge website._
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.
```
Inline `code` has `back-ticks around` it.
Example:
```javascript
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!")
puts markdown.to_html
```
```
No language indicated, so no syntax highlighting.
s = "There is no highlighting for this."
But let's throw in a <b>tag</b>.
```
becomes:
```javascript
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!")
puts markdown.to_html
```
```
No language indicated, so no syntax highlighting.
s = "There is no highlighting for this."
But let's throw in a <b>tag</b>.
```
## Inline Diff
With inline diffs tags you can display {+ additions +} or [- deletions -].
The wrapping tags can be either curly braces or square brackets [+ additions +] or {- deletions -}.
However the wrapping tags cannot be mixed as such:
- {+ additions +]
- [+ additions +}
- {- deletions -]
- [- deletions -}
## Emoji
Sometimes you want to :monkey: around a bit and add some :star2: to your :speech_balloon:. Well we have a gift for you:
:zap: You can use emoji anywhere GFM is supported. :v:
You can use it to point out a :bug: or warn about :speak_no_evil: patches. And if someone improves your really :snail: code, send them some :birthday:. People will :heart: you for that.
If you are new to this, don't be :fearful:. You can easily join the emoji :family:. All you need to do is to look up on the supported codes.
Consult the [Emoji Cheat Sheet](http://emoji.codes) for a list of all supported emoji codes. :thumbsup:
Sometimes you want to :monkey: around a bit and add some :star2: to your :speech_balloon:. Well we have a gift for you:
:zap: You can use emoji anywhere GFM is supported. :v:
You can use it to point out a :bug: or warn about :speak_no_evil: patches. And if someone improves your really :snail: code, send them some :birthday:. People will :heart: you for that.
If you are new to this, don't be :fearful:. You can easily join the emoji :family:. All you need to do is to look up on the supported codes.
Consult the [Emoji Cheat Sheet](http://emoji.codes) for a list of all supported emoji codes. :thumbsup:
## Special GitLab References
GFM recognizes special references.
You can easily reference e.g. an issue, a commit, a team member or even the whole team within a project.
GFM will turn that reference into a link so you can navigate between them easily.
GFM will recognize the following:
| input | references |
|:-----------------------|:---------------------------|
| `@user_name` | specific user |
| `@group_name` | specific group |
| `@all` | entire team |
| `#123` | issue |
| `!123` | merge request |
| `$123` | snippet |
| `~123` | label by ID |
| `~bug` | one-word label by name |
| `~"feature request"` | multi-word label by name |
| `9ba12248` | specific commit |
| `9ba12248...b19a04f5` | commit range comparison |
| `[README](doc/README)` | repository file references |
GFM also recognizes certain cross-project references:
| input | references |
|:----------------------------------------|:------------------------|
| `namespace/project#123` | issue |
| `namespace/project!123` | merge request |
| `namespace/project$123` | snippet |
| `namespace/project@9ba12248` | specific commit |
| `namespace/project@9ba12248...b19a04f5` | commit range comparison |
| `namespace/project~"Some label"` | issues with given label |
## Task Lists
You can add task lists to issues, merge requests and comments. To create a task list, add a specially-formatted Markdown list, like so:
```no-highlight
- [x] Completed task
- [ ] Incomplete task
- [ ] Sub-task 1
- [x] Sub-task 2
- [ ] Sub-task 3
```
- [x] Completed task
- [ ] Incomplete task
- [ ] Sub-task 1
- [x] Sub-task 2
- [ ] Sub-task 3
Task lists can only be created in descriptions, not in titles. Task item state can be managed by editing the description's Markdown or by toggling the rendered check boxes.
# Standard Markdown
## Headers
```no-highlight
# H1
## H2
### H3
#### H4
##### H5
###### H6
Alternatively, for H1 and H2, an underline-ish style:
Alt-H1
======
Alt-H2
------
```
# H1
## H2
### H3
#### H4
##### H5
###### H6
Alternatively, for H1 and H2, an underline-ish style:
Alt-H1
======
Alt-H2
------
### Header IDs and links
All Markdown-rendered headers automatically get IDs, except in 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. All text is converted to lowercase
1. All non-word text (e.g., punctuation, HTML) is removed
1. All spaces are converted to hyphens
1. Two or more hyphens in a row are converted to one
1. If a header with the same ID has already been generated, a unique
incrementing number is appended, starting at 1.
For example:
```
# This header has spaces in it
## This header has a :thumbsup: in it
# This header has Unicode in it: 한글
## This header has spaces in it
### This header has spaces in it
```
Would generate the following link IDs:
1. `this-header-has-spaces-in-it`
1. `this-header-has-a-in-it`
1. `this-header-has-unicode-in-it-한글`
1. `this-header-has-spaces-in-it`
1. `this-header-has-spaces-in-it-1`
Note that the Emoji processing happens before the header IDs are generated, so the Emoji is converted to an image which then gets removed from the ID.
## Emphasis
```no-highlight
Emphasis, aka italics, with *asterisks* or _underscores_.
Strong emphasis, aka bold, with **asterisks** or __underscores__.
Combined emphasis with **asterisks and _underscores_**.
Strikethrough uses two tildes. ~~Scratch this.~~
```
Emphasis, aka italics, with *asterisks* or _underscores_.
Strong emphasis, aka bold, with **asterisks** or __underscores__.
Combined emphasis with **asterisks and _underscores_**.
Strikethrough uses two tildes. ~~Scratch this.~~
## Lists
```no-highlight
1. First ordered list item
2. Another item
* Unordered sub-list.
1. Actual numbers don't matter, just that it's a number
1. Ordered sub-list
4. And another item.
* Unordered list can use asterisks
- Or minuses
+ Or pluses
```
1. First ordered list item
2. Another item
* Unordered sub-list.
1. Actual numbers don't matter, just that it's a number
1. Ordered sub-list
4. And another item.
* Unordered list can use asterisks
- Or minuses
+ Or pluses
If a list item contains multiple paragraphs,
each subsequent paragraph should be indented with four spaces.
```no-highlight
1. First ordered list item
Second paragraph of first item.
2. Another item
```
1. First ordered list item
Second paragraph of first item.
2. Another item
If the second paragraph isn't indented with four spaces,
the second list item will be incorrectly labeled as `1`.
```no-highlight
1. First ordered list item
Second paragraph of first item.
2. Another item
```
1. First ordered list item
Second paragraph of first item.
2. Another item
## Links
There are two ways to create links, inline-style and reference-style.
[I'm an inline-style link](https://www.google.com)
[I'm a reference-style link][Arbitrary case-insensitive reference text]
[I'm a relative reference to a repository file](LICENSE)
[You can use numbers for reference-style link definitions][1]
Or leave it empty and use the [link text itself][]
Some text to show that the reference links can follow later.
[arbitrary case-insensitive reference text]: https://www.mozilla.org
[1]: http://slashdot.org
[link text itself]: https://www.reddit.com
[I'm an inline-style link](https://www.google.com)
[I'm a reference-style link][Arbitrary case-insensitive reference text]
[I'm a relative reference to a repository file](LICENSE)
[You can use numbers for reference-style link definitions][1]
Or leave it empty and use the [link text itself][]
Some text to show that the reference links can follow later.
[arbitrary case-insensitive reference text]: https://www.mozilla.org
[1]: http://slashdot.org
[link text itself]: https://www.reddit.com
**Note**
Relative links do not allow referencing project files in a wiki page or wiki page in a project file. The reason for this is that, in GitLab, wiki is always a separate git repository. For example:
`[I'm a reference-style link](style)`
will point the link to `wikis/style` when the link is inside of a wiki markdown file.
## Images
Here's our logo (hover to see the title text):
Inline-style:
![alt text](img/logo.png)
Reference-style:
![alt text1][logo]
[logo]: img/logo.png
Here's our logo:
Inline-style:
![alt text](img/logo.png)
Reference-style:
![alt text][logo]
[logo]: img/logo.png
## Blockquotes
```no-highlight
> Blockquotes are very handy in email to emulate reply text.
> This line is part of the same quote.
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.
```
> Blockquotes are very handy in email to emulate reply text.
> This line is part of the same quote.
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.
## Inline HTML
You can also use raw HTML in your Markdown, and it'll mostly work pretty well.
See the documentation for HTML::Pipeline's [SanitizationFilter](http://www.rubydoc.info/gems/html-pipeline/HTML/Pipeline/SanitizationFilter#WHITELIST-constant) class for the list of allowed HTML tags and attributes. In addition to the default `SanitizationFilter` whitelist, GitLab allows `span` elements.
```no-highlight
<dl>
<dt>Definition list</dt>
<dd>Is something people use sometimes.</dd>
<dt>Markdown in HTML</dt>
<dd>Does *not* work **very** well. Use HTML <em>tags</em>.</dd>
</dl>
```
<dl>
<dt>Definition list</dt>
<dd>Is something people use sometimes.</dd>
<dt>Markdown in HTML</dt>
<dd>Does *not* work **very** well. Use HTML <em>tags</em>.</dd>
</dl>
## Horizontal Rule
```
Three or more...
---
Hyphens
***
Asterisks
___
Underscores
```
Three or more...
---
Hyphens
***
Asterisks
___
Underscores
## Line Breaks
My basic recommendation for learning how line breaks work is to experiment and discover -- hit <Enter> 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:
```
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 a separate paragraph, but...
This line is only separated by a single newline, so it's a separate line in the *same paragraph*.
This line is also a separate paragraph, and...
This line is on its own line, because the previous line ends with two
spaces.
```
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 only separated by a single newline, so it's a separate line in the *same paragraph*.
This line is also a separate paragraph, and...
This line is on its own line, because the previous line ends with two
spaces.
## Tables
Tables aren't part of the core Markdown spec, but they are part of GFM and Markdown Here supports them.
```
| header 1 | header 2 |
| -------- | -------- |
| cell 1 | cell 2 |
| cell 3 | cell 4 |
```
Code above produces next output:
| header 1 | header 2 |
| -------- | -------- |
| cell 1 | cell 2 |
| cell 3 | cell 4 |
**Note**
The row of dashes between the table header and body must have at least three dashes in each column.
By including colons in the header row, you can align the text within that column:
```
| Left Aligned | Centered | Right Aligned | Left Aligned | Centered | Right Aligned |
| :----------- | :------: | ------------: | :----------- | :------: | ------------: |
| Cell 1 | Cell 2 | Cell 3 | Cell 4 | Cell 5 | Cell 6 |
| Cell 7 | Cell 8 | Cell 9 | Cell 10 | Cell 11 | Cell 12 |
```
| Left Aligned | Centered | Right Aligned | Left Aligned | Centered | Right Aligned |
| :----------- | :------: | ------------: | :----------- | :------: | ------------: |
| Cell 1 | Cell 2 | Cell 3 | Cell 4 | Cell 5 | Cell 6 |
| Cell 7 | Cell 8 | Cell 9 | Cell 10 | Cell 11 | Cell 12 |
## References
- This document leveraged heavily from the [Markdown-Cheatsheet](https://github.com/adam-p/markdown-here/wiki/Markdown-Cheatsheet).
- The [Markdown Syntax Guide](https://daringfireball.net/projects/markdown/syntax) at Daring Fireball is an excellent resource for a detailed explanation of standard markdown.
- [Dillinger.io](http://dillinger.io) is a handy tool for testing standard markdown.
[rouge]: http://rouge.jneen.net/ "Rouge website"
[redcarpet]: https://github.com/vmg/redcarpet "Redcarpet website"
|