--- description: 'Writing styles, markup, formatting, and reusing regular expressions throughout the GitLab Documentation.' --- # Documentation style guidelines The documentation style guide defines the markup structure used in GitLab documentation. Check the [documentation guidelines](writing_documentation.md) for general development instructions. Check the GitLab handbook for the [writing styles guidelines](https://about.gitlab.com/handbook/communication/#writing-style-guidelines). ## Text - Split up long lines (wrap text), this makes it much easier to review and edit. Only double line breaks are shown as a full line break in [GitLab markdown][gfm]. 80-100 characters is a good line length - Make sure that the documentation is added in the correct [directory](writing_documentation.md#documentation-directory-structure) and that there's a link to it somewhere useful - Do not duplicate information - Be brief and clear - Unless there's a logical reason not to, add documents in alphabetical order - Write in US English - Use [single spaces][] instead of double spaces - Jump a line between different markups (e.g., after every paragraph, header, list, etc) - Capitalize "G" and "L" in GitLab - Use sentence case for titles, headings, labels, menu items, and buttons. - Use title case when referring to [features](https://about.gitlab.com/features/) or [products](https://about.gitlab.com/pricing/), and methods. Note that some features are also objects (e.g. "Merge Requests" and "merge requests"). E.g.: GitLab Runner, Geo, Issue Boards, Git, Prometheus, Continuous Integration. ## Formatting - Use double asterisks (`**`) to mark a word or text in bold (`**bold**`) - Use undescore (`_`) for text in italics (`_italic_`) - Jump a line between different markups, for example: ```md ## Header Paragraph. - List item - List item ``` ### Punctuation For punctuation rules, please refer to the [GitLab UX guide](https://design.gitlab.com/content/punctuation/). ### Ordered and unordered lists - Use dashes (`-`) for unordered lists instead of asterisks (`*`) - Use the number one (`1`) for ordered lists - For punctuation in bullet lists, please refer to the [GitLab UX guide](https://design.gitlab.com/content/punctuation/) ## Headings - Add **only one H1** in each document, by adding `#` at the beginning of it (when using markdown). The `h1` will be the document ``. - For subheadings, use `##`, `###` and so on - Avoid putting numbers in headings. Numbers shift, hence documentation anchor links shift too, which eventually leads to dead links. If you think it is compelling to add numbers in headings, make sure to at least discuss it with someone in the Merge Request - [Avoid using symbols and special chars](https://gitlab.com/gitlab-com/gitlab-docs/issues/84) in headers. Whenever possible, they should be plain and short text. - Avoid adding things that show ephemeral statuses. For example, if a feature is considered beta or experimental, put this info in a note, not in the heading. - When introducing a new document, be careful for the headings to be grammatically and syntactically correct. Mention one or all of the following GitLab members for a review: `@axil` or `@marcia`. This is to ensure that no document with wrong heading is going live without an audit, thus preventing dead links and redirection issues when corrected - Leave exactly one newline after a heading ## Links - Use the regular inline link markdown markup `[Text](https://example.com)`. It's easier to read, review, and maintain. - If there's a link that repeats several times through the same document, you can use `[Text][identifier]` and at the bottom of the section or the document add: `[identifier]: https://example.com`, in which case, we do encourage you to also add an alternative text: `[identifier]: https://example.com "Alternative text"` that appears when hovering your mouse on a link. - To link to internal documentation, use relative links, not full URLs. Use `../` to navigate tp high-level directories, and always add the file name `file.md` at the end of the link with the `.md` extension, not `.html`. Example: instead of `[text](../../merge_requests/)`, use `[text](../../merge_requests/index.md)` or, `[text](../../ci/README.md)`, or, for anchor links, `[text](../../ci/README.md#examples)`. Using the markdown extension is necessary for the [`/help`](writing_documentation.md#gitlab-help) section of GitLab. - To link from CE to EE-only documentation, use the EE-only doc full URL. - Use [meaningful anchor texts](https://www.futurehosting.com/blog/links-should-have-meaningful-anchor-text-heres-why/). E.g., instead of writing something like `Read more about GitLab Issue Boards [here](LINK)`, write `Read more about [GitLab Issue Boards](LINK)`. ## Images - Place images in a separate directory named `img/` in the same directory where the `.md` document that you're working on is located. Always prepend their names with the name of the document that they will be included in. For example, if there is a document called `twitter.md`, then a valid image name could be `twitter_login_screen.png`. [**Exception**: images for [articles](writing_documentation.md#technical-articles) should be put in a directory called `img` underneath `/articles/article_title/img/`, therefore, there's no need to prepend the document name to their filenames.] - Images should have a specific, non-generic name that will differentiate them. - Keep all file names in lower case. - Consider using PNG images instead of JPEG. - Compress all images with <https://tinypng.com/> or similar tool. - Compress gifs with <https://ezgif.com/optimize> or similar tool. - Images should be used (only when necessary) to _illustrate_ the description of a process, not to _replace_ it. Inside the document: - The Markdown way of using an image inside a document is: `![Proper description what the image is about](img/document_image_title.png)` - Always use a proper description for what the image is about. That way, when a browser fails to show the image, this text will be used as an alternative description - If there are consecutive images with little text between them, always add three dashes (`---`) between the image and the text to create a horizontal line for better clarity - If a heading is placed right after an image, always add three dashes (`---`) between the image and the heading ## Alert boxes Whenever you want to call the attention to a particular sentence, use the following markup for highlighting. _Note that the alert boxes only work for one paragraph only. Multiple paragraphs, lists, headers, etc will not render correctly._ ### Note ```md NOTE: **Note:** This is something to note. ``` How it renders in docs.gitlab.com: NOTE: **Note:** This is something to note. ### Tip ```md TIP: **Tip:** This is a tip. ``` How it renders in docs.gitlab.com: TIP: **Tip:** This is a tip. ### Caution ```md CAUTION: **Caution:** This is something to be cautious about. ``` How it renders in docs.gitlab.com: CAUTION: **Caution:** This is something to be cautious about. ### Danger ```md DANGER: **Danger:** This is a breaking change, a bug, or something very important to note. ``` How it renders in docs.gitlab.com: DANGER: **Danger:** This is a breaking change, a bug, or something very important to note. ## Blockquotes For highlighting a text within a blue blockquote, use this format: ```md > This is a blockquote. ``` which renders in docs.gitlab.com to: > This is a blockquote. If the text spans across multiple lines it's OK to split the line. ## Specific sections and terms To mention and/or reference specific terms in GitLab, please follow the styles below. ### GitLab versions and tiers - Every piece of documentation that comes with a new feature should declare the GitLab version that feature got introduced. Right below the heading add a note: ```md > Introduced in GitLab 8.3. ``` - Whenever possible, every feature should have a link to the MR, issue, or epic that introduced it. The above note would be then transformed to: ```md > [Introduced][ce-1242] in GitLab 8.3. ``` , where the [link identifier](#links) is named after the repository (CE) and the MR number. - If the feature is only available in GitLab Enterprise Edition, don't forget to mention the [paid tier](https://about.gitlab.com/handbook/marketing/product-marketing/#tiers) the feature is available in: ```md > [Introduced][ee-1234] in [GitLab Starter](https://about.gitlab.com/pricing/) 8.3. ``` ### Product badges When a feature is available in EE-only tiers, add the corresponding tier according to the feature availability: - For GitLab Starter and GitLab.com Bronze: `**[STARTER]**` - For GitLab Premium and GitLab.com Silver: `**[PREMIUM]**` - For GitLab Ultimate and GitLab.com Gold: `**[ULTIMATE]**` - For GitLab Core and GitLab.com Free: `**[CORE]**` To exclude GitLab.com tiers (when the feature is not available in GitLab.com), add the keyword "only": - For GitLab Starter: `**[STARTER ONLY]**` - For GitLab Premium: `**[PREMIUM ONLY]**` - For GitLab Ultimate: `**[ULTIMATE ONLY]**` - For GitLab Core: `**[CORE ONLY]**` The tier should be ideally added to headers, so that the full badge will be displayed. But it can be also mentioned from paragraphs, list items, and table cells. For these cases, the tier mention will be represented by an orange question mark. E.g., `**[STARTER]**` renders **[STARTER]**, `**[STARTER ONLY]**` renders **[STARTER ONLY]**. The absence of tiers' mentions mean that the feature is available in GitLab Core, GitLab.com Free, and higher tiers. #### How it works Introduced by [!244](https://gitlab.com/gitlab-com/gitlab-docs/merge_requests/244), the special markup `**[STARTER]**` will generate a `span` element to trigger the badges and tooltips (`<span class="badge-trigger starter">`). When the keyword "only" is added, the corresponding GitLab.com badge will not be displayed. ### GitLab Restart There are many cases that a restart/reconfigure of GitLab is required. To avoid duplication, link to the special document that can be found in [`doc/administration/restart_gitlab.md`][doc-restart]. Usually the text will read like: ``` Save the file and [reconfigure GitLab](../administration/restart_gitlab.md) for the changes to take effect. ``` If the document you are editing resides in a place other than the GitLab CE/EE `doc/` directory, instead of the relative link, use the full path: `http://docs.gitlab.com/ce/administration/restart_gitlab.html`. Replace `reconfigure` with `restart` where appropriate. ### Installation guide **Ruby:** In [step 2 of the installation guide](../install/installation.md#2-ruby), we install Ruby from source. Whenever there is a new version that needs to be updated, remember to change it throughout the codeblock and also replace the sha256sum (it can be found in the [downloads page][ruby-dl] of the Ruby website). [ruby-dl]: https://www.ruby-lang.org/en/downloads/ "Ruby download website" ### Configuration documentation for source and Omnibus installations GitLab currently officially supports two installation methods: installations from source and Omnibus packages installations. Whenever there is a setting that is configurable for both installation methods, prefer to document it in the CE docs to avoid duplication. Configuration settings include: - settings that touch configuration files in `config/` - NGINX settings and settings in `lib/support/` in general When there is a list of steps to perform, usually that entails editing the configuration file and reconfiguring/restarting GitLab. In such case, follow the style below as a guide: ```md **For Omnibus installations** 1. Edit `/etc/gitlab/gitlab.rb`: ```ruby external_url "https://gitlab.example.com" ``` 1. Save the file and [reconfigure] GitLab for the changes to take effect. --- **For installations from source** 1. Edit `config/gitlab.yml`: ```yaml gitlab: host: "gitlab.example.com" ``` 1. Save the file and [restart] GitLab for the changes to take effect. [reconfigure]: path/to/administration/restart_gitlab.md#omnibus-gitlab-reconfigure [restart]: path/to/administration/restart_gitlab.md#installations-from-source ``` In this case: - before each step list the installation method is declared in bold - three dashes (`---`) are used to create a horizontal line and separate the two methods - the code blocks are indented one or more spaces under the list item to render correctly - different highlighting languages are used for each config in the code block - the [references](#references) guide is used for reconfigure/restart ### Fake tokens There may be times where a token is needed to demonstrate an API call using cURL or a secret variable used in CI. It is strongly advised not to use real tokens in documentation even if the probability of a token being exploited is low. You can use the following fake tokens as examples. | **Token type** | **Token value** | | --------------------- | --------------------------------- | | Private user token | `9koXpg98eAheJpvBs5tK` | | Personal access token | `n671WNGecHugsdEDPsyo` | | Application ID | `2fcb195768c39e9a94cec2c2e32c59c0aad7a3365c10892e8116b5d83d4096b6` | | Application secret | `04f294d1eaca42b8692017b426d53bbc8fe75f827734f0260710b83a556082df` | | Secret CI variable | `Li8j-mLUVA3eZYjPfd_H` | | Specific Runner token | `yrnZW46BrtBFqM7xDzE7dddd` | | Shared Runner token | `6Vk7ZsosqQyfreAxXTZr` | | Trigger token | `be20d8dcc028677c931e04f3871a9b` | | Webhook secret token | `6XhDroRcYPM5by_h-HLY` | | Health check token | `Tu7BgjR9qeZTEyRzGG2P` | | Request profile token | `7VgpS4Ax5utVD2esNstz` | ### API Here is a list of must-have items. Use them in the exact order that appears on this document. Further explanation is given below. - Every method must have the REST API request. For example: ``` GET /projects/:id/repository/branches ``` - Every method must have a detailed [description of the parameters](#method-description). - Every method must have a cURL example. - Every method must have a response body (in JSON format). #### Method description Use the following table headers to describe the methods. Attributes should always be in code blocks using backticks (``` ` ```). ``` | Attribute | Type | Required | Description | | --------- | ---- | -------- | ----------- | ``` Rendered example: | Attribute | Type | Required | Description | | --------- | ---- | -------- | ----------- | | `user` | string | yes | The GitLab username | #### cURL commands - Use `https://gitlab.example.com/api/v4/` as an endpoint. - Wherever needed use this personal access token: `9koXpg98eAheJpvBs5tK`. - Always put the request first. `GET` is the default so you don't have to include it. - Use double quotes to the URL when it includes additional parameters. - Prefer to use examples using the personal access token and don't pass data of username and password. | Methods | Description | | ------- | ----------- | | `-H "PRIVATE-TOKEN: 9koXpg98eAheJpvBs5tK"` | Use this method as is, whenever authentication needed | | `-X POST` | Use this method when creating new objects | | `-X PUT` | Use this method when updating existing objects | | `-X DELETE` | Use this method when removing existing objects | #### cURL Examples Below is a set of [cURL][] examples that you can use in the API documentation. ##### Simple cURL command Get the details of a group: ```bash curl --header "PRIVATE-TOKEN: 9koXpg98eAheJpvBs5tK" https://gitlab.example.com/api/v4/groups/gitlab-org ``` ##### cURL example with parameters passed in the URL Create a new project under the authenticated user's namespace: ```bash curl --request POST --header "PRIVATE-TOKEN: 9koXpg98eAheJpvBs5tK" "https://gitlab.example.com/api/v4/projects?name=foo" ``` ##### Post data using cURL's --data Instead of using `-X POST` and appending the parameters to the URI, you can use cURL's `--data` option. The example below will create a new project `foo` under the authenticated user's namespace. ```bash curl --data "name=foo" --header "PRIVATE-TOKEN: 9koXpg98eAheJpvBs5tK" "https://gitlab.example.com/api/v4/projects" ``` ##### Post data using JSON content > **Note:** In this example we create a new group. Watch carefully the single and double quotes. ```bash curl --request POST --header "PRIVATE-TOKEN: 9koXpg98eAheJpvBs5tK" --header "Content-Type: application/json" --data '{"path": "my-group", "name": "My group"}' https://gitlab.example.com/api/v4/groups ``` ##### Post data using form-data Instead of using JSON or urlencode you can use multipart/form-data which properly handles data encoding: ```bash curl --request POST --header "PRIVATE-TOKEN: 9koXpg98eAheJpvBs5tK" --form "title=ssh-key" --form "key=ssh-rsa AAAAB3NzaC1yc2EA..." https://gitlab.example.com/api/v4/users/25/keys ``` The above example is run by and administrator and will add an SSH public key titled ssh-key to user's account which has an id of 25. ##### Escape special characters Spaces or slashes (`/`) may sometimes result to errors, thus it is recommended to escape them when possible. In the example below we create a new issue which contains spaces in its title. Observe how spaces are escaped using the `%20` ASCII code. ```bash curl --request POST --header "PRIVATE-TOKEN: 9koXpg98eAheJpvBs5tK" "https://gitlab.example.com/api/v4/projects/42/issues?title=Hello%20Dude" ``` Use `%2F` for slashes (`/`). ##### Pass arrays to API calls The GitLab API sometimes accepts arrays of strings or integers. For example, to restrict the sign-up e-mail domains of a GitLab instance to `*.example.com` and `example.net`, you would do something like this: ```bash curl --request PUT --header "PRIVATE-TOKEN: 9koXpg98eAheJpvBs5tK" --data "domain_whitelist[]=*.example.com" --data "domain_whitelist[]=example.net" https://gitlab.example.com/api/v4/application/settings ``` [cURL]: http://curl.haxx.se/ "cURL website" [single spaces]: http://www.slate.com/articles/technology/technology/2011/01/space_invaders.html [gfm]: http://docs.gitlab.com/ce/user/markdown.html#newlines "GitLab flavored markdown documentation" [ce-1242]: https://gitlab.com/gitlab-org/gitlab-ce/issues/1242 [doc-restart]: ../administration/restart_gitlab.md "GitLab restart documentation"