Updating the Developer Guide¶

Setting up a documentation environment¶

To work on documentation and be able to view the rendered web site you need to create an environment, which comprises of:

The developer guide is created using MkDocs with the Materials theme theme.

MkDocs takes Markdown documents and turns them into a static website, that can be accessed from a filesystem or served from a web server.

A link checker tool is also used to validate all links in the MkDocs generated website.

Document layout¶

The documentation is organized into distinct sections to provide easy navigation and allow self-service viewers to get started, then dive into deeper content with a clear path.

The sections are as follows:

1. Overview - This is high level information about the Cloud-Native Toolkit. What it is and why does it exist.
2. Install - This is a section designed to help the first time user get up and running with minimal knowledge. More advanced install options are provided in a later section
3. Learning - This section is designed to teach the fundamentals of Cloud-Native development with the toolkit. Using a default installation of the Toolkit to work through Continuous Integration and Continuous Delivery. This section is more about Cloud-Native development and how the Toolkit provides functionality to support Cloud-Native development rather than a deep dive on specific tools that are part of the toolkit.
4. Adopting - This section is designed to move from the initial learning phase to adopting the Toolkit as part of development activities. It covers more advanced installation options, customization options, best practices and how the Toolkit can be applied to certain use cases
5. Reference - The reference section is the technical documentation for the resources delivered by the Toolkit.
6. Resources - The resources section provides links to content outside the toolkit that someone learning the toolkit may find useful
7. Contributing - This section provides how someone can become a contributor to the Cloud-Native Toolkit project, which includes the core Toolkit, adding additional starter kits or pipeline tasks, updating or adding to the documentation.

Creating content¶

MkDocs supports standard Markdown syntax and a set Markdown extensions provided by plugins. The exact Markdown syntax supported is based on the python implementation.

MkDocs is configured using the mkdocs.yml file in the root of the git repository. For the prototype, the existing Gatsby content is still within the repository, with the prototype content located in the mkdocs directory.

The mkdoc.yml file defines the top level navigation for the site. The level of indentation is configurable (this requires the theme to support this feature) with Markdown headings, levels 2 (##) and 3 (###) being used for the page navigation on the right of the page.

Standard Markdown features¶

The following markdown syntax is used within the documentation

HTML can be embedded in Markdown, but in the documentation it is preferred to stick with pure Markdown with the installed extensions.

Links within MkDocs generated content¶

MkDocs will warn of any internal broken links, so it is important that links within the documentation are recognized as internal links.

• a link starting with a protocol name, such as http or https, is an external link
• a link starting with / is an external link. This is because MkDocs generated content can be embedded into another web application, so links can point outside of the MkDocs generated site but hosted on the same website
• a link starting with a file name (including the .md extension) or relative directory (../directory/filename.md) is an internal link and will be verified by MkDocs

As part of the build process a linkchecker application will check the generated html site for any broken links. You can run this linkchecker locally using the instructions. If any links in the documentation should be excluded from the link checker, such as links to localhost, then they should be added as a regex to the linkcheckerrc file, located in the root folder of the project - see linkchecker documentation for additional information

Extensions used in the prototype¶

There are a number of Markdown extensions being used in the prototype. See the mkdocs.yml file to see which extensions are configured. The documentation for the extensions can be found here

Link configuration¶

Links on the page or embedded images can be annotated to control the links and also the appearance of the links:

Image¶

Images are embedded in a page using the standard Markdown syntax ![description](URL), but the image can be formatted with Attribute Lists. This is most commonly used to scale an image or center an image, e.g.

![GitHub repo url](images/github-repo-url.png){style="width: 80%" .center }

External Links¶

External links can also use attribute lists to control behaviors, such as open in new tab or add a css class attribute to the generated HTML, such as external in the example below:

[MkDocs](http://mkdocs.org){: target="_blank" .external }

YouTube videos¶

It is possible to embed a YouTube video and have it play in place using pure markdown. You can use HTML to embed a video:

<iframe width="100%" height="500" src="https://www.youtube-nocookie.com/embed/V-BFLaPdoPo" title="YouTube video player" frameborder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture" allowfullscreen></iframe>

Tabs¶

Content can be organized into a set of horizontal tabs.

=== "Tab 1"
    Hello

=== "Tab 2"
    World

produces :

Information boxes¶

The Admonition extension allows you to add themed information boxes using the !!! and ??? syntax:

!!! note
    This is a note

produces:

and

??? note
    This is a note

    You can add a `+` character to force the box to be initially open `???+`

produces a collapsible box:

You can override the title of the box by providing a title after the Admonition type.

!!!Example
    You can also nest different components as required

    === "note"
        !!!note
            This is a note

    === "collapsible note"
        ???+note
            This is a note

    === "custom title note"
        !!!note "Sample Title"
            This is a note

Supported Admonition Classes¶

The Admonitions supported by the Material theme are :

Code blocks¶

Code blocks allow you to insert code or blocks of text in line or as a block.

To use inline you simply enclose the text using a single back quote ` character. So a command can be included using `oc get pods` and will create oc get pods

When you want to include a block of code you use a fence, which is 3 back quote character at the start and end of the block. After the opening quotes you should also specify the content type contained in the block.

``` shell oc get pods ```

which will produce:

oc get pods

Notice that the block automatically gets the copy to clipboard link to allow easy copy and paste.

Every code block needs to identify the content. Where there is no content type, then text should be used to identify the content as plain text. Some of the common content types are shown in the table below. However, a full link of supported content types can be found here, where the short name in the documentation should be used.

Advanced highlighting of code blocks¶

There are some additional features available due to the highlight plugin installed in MkDocs. Full details can be found in the MkDocs Materials documentation.

Line numbers¶

You can add line numbers to a code block with the linenums directive. You must specify the starting line number, 1 in the example below:

``` javascript linenums="1"
<script>
document.getElementById("demo").innerHTML = "My First JavaScript";
</script>
```

creates

1
2
3

<script>
document.getElementById("demo").innerHTML = "My First JavaScript";
</script>

Code highlighting¶

You can highlight specific lines of code using the hl_lines directive. The line numbers starts at 1 for the first line of code. If you want multiple lines highlighted, then provide the line numbers separated with a space. Below lines 1 and 3 are highlighted:

``` javascript hl_lines="1 3"
<script>
document.getElementById("demo").innerHTML = "My First JavaScript";
</script>
```

creates

<script>
document.getElementById("demo").innerHTML = "My First JavaScript";
</script>

It is possible to combine line number and highlighting. Below I start the line numbers at 10 and highlight the second line of code:

``` javascript linenums="10" hl_lines="2"
<script>
document.getElementById("demo").innerHTML = "My First JavaScript";
</script>
```

creates

10
11
12

<script>
document.getElementById("demo").innerHTML = "My First JavaScript";
</script>

Redirects¶

To help external sites wanting to link to the documentation there are a number of vanity links maintained using the redirect plugin. The links are defined in the mkdocs.yml file and documented on the Additional Resources page.

To ensure the auto-generated link page does not get reported by the link checker, an entry needs to be added to the nofollow section of the link checker config file, linkcheckerrc in the root directory of the project.

E.g. if a link /help was created then an entry in the nofollow section should be public/help.html$.

Spell checking¶

This project uses cSpell to check spelling within the markdown. The configuration included in the project automatically excludes content in a code block, enclosed in triple back quotes ```.

The configuration file also specifies that US English is the language used in the documentation, so only US English spellings should be used for words where alternate international English spellings exist.

You can add words to be considered valid either within a markdown document or within the cspell configuration file, cspell.json, in the root folder of the documentation repository.

Words defined within a page only apply to that page, but words added to the configuration file apply to the entire project.

Adding local words¶

You can add a list of words to be considered valid for spell checking purposes as a comment in a Markdown file.

The comment has a specific format to be picked up by the cSpell tool:

<!--- cSpell:ignore linkchecker linkcheckerrc mkdocs mkdoc -->

here the words linkchecker, linkcheckerrc, mkdocs and mkdoc are specified as words to be accepted by the spell checker within the file containing the comment.

Adding global words¶

The cSpell configuration file cspell.json contains a list of words that should always be considered valid when spell checking. The list of words applies to all files being checked.