Friday 14 May 2021

WaveDrom with Confluence (Server)

Summary
This blog illustrates how Atlassian's Confluence tool can work with WaveDrom to render scripts. The process requires
Confluence Administrator access and a small amount of configuration.

Example of WaveDrom Output
Example of WaveDrom Output

Enabling the HTML Macro
The process of enabling HTML Macro's in Confluence Server is documented in this blog and formally on the Atlassian website here.   

The Custom HTML feature is accessed under the Administration 'cog' icon.

Confluence Manage Apps
Confluence Manage Apps

Open the Manage Apps item. Select System from the drop-down list box. Type HTML into the Filter Visible Apps text box.

Confluence Locate HTML Macro
Confluence Locate HTML Macro
 

After typing into the filter, the HTML Macro should be displayed.

Confluence HTML Macro
Confluence HTML Macro


Expand the Confluence HTML Macro heading.

Confluence HTML Macro Expanded
Confluence HTML Macro Expanded

Then expand the modules enabled heading.

Confluence HTML Macro Enabling
Confluence HTML Macro Enabling


Locate the html (html-xhtml) entry and enable.

This first step is complete.

Custom HTML
To execute a WaveDrom script, the Confluence HTML Macro is processed by custom code added to Confluence pages. The custom code links  JavaScript libraries and calls a function to process the WaveDrom script.

Information relating to the libraries is detailed under the Web Usage section of the WaveDrom site on GitHub.

Below is the code taken from the GitHub site.

<script src="https://cdnjs.cloudflare.com/ajax/libs/wavedrom/2.6.8/skins/default.js" type="text/javascript"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/wavedrom/2.6.8/wavedrom.min.js" type="text/javascript"></script>
<
body onload="WaveDrom.ProcessAll()">

To add Custom HTML, open the Custom HTML entry under the Look and Feel heading whilst under Confluence Administration.

Confluence Custom HTML
Confluence Custom HTML

Click Edit.

Confluence Added WaveDrom Link
Confluence Added WaveDrom Link

Under the End of Head section, add the code from the GitHub site.

Confluence Adding WaveDrom
Confluence Adding WaveDrom

Click Save, this step is completed.

Note that some companies or IT providers may have policies restricting access to external sites.

HTML Macro on Pages with WaveDrom
A script can be generated in the
WaveDrom editor then copied into Confluence after it has been finalised or the script can be manually entered into the a HTML macro.

An HTML macro is required to contain the WaveDrom script.

On the required page, use the Insert More Content (Ctrl + Shift + A) to locate the HTML macro. Typing HTML into the Search box will expedite the process.

Confluence Select Macro
Confluence Select Macro

Click the HTML then Insert.

Confluence Select Macro Insert
Confluence Select Macro Insert

An editable box titled with HTML be displayed.

HTML Macro Inserted into Confluence
HTML Macro Inserted into Confluence
 

The WaveDrom script is then copied into the HTML field.

HTML Macro with WaveDrom Script
HTML Macro with WaveDrom Script

Click Update at the bottom of the Confluence page to complete the change.

View the page to ensure the render has worked.

Example of WaveDrom Output
Example of WaveDrom Output

Final Thoughts
Tools such as WaveDrom can provide a permanent description of information such as timing diagrams. Integrating the functionality of WaveDrom into a collaboration tool such as Confluence can reduce the requirement for separate applications and documentation tool consistency.