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enso/docs/style-guide/markdown.md

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Markdown Style Guide

Markdown's primary strength is that it's readable in its source form as well as its rendered form. In the team we seem to have our reading time split evenly between the two, and so creating a readable format for our markdown documentation is very important.

Automated Formatting

The bulk of the heavy lifting for formatting our markdown is done by the formatter prettier. This formatter should be run on the entire repository using npx prettier --write . before every pull request.

For instructions on how to install it, please see our contributing guidelines.

If you notice files in generated code being formatted by prettier, please add them to the .prettierignore file.

When bumping the version of prettier, please commit the resultant documentation formatting changes along with the bump as a separate PR from any functional code changes.

Manual Formatting

Unfortunately, however, prettier doesn't cope with all of the requirements that we place on our markdown source files to ensure that they're both easy to read and easy to navigate.

The following elements require manual formatting.

Title Case

All section headings should use Title Case.

The only exceptions to this rule are where the title refers to the name of an in-language construct. In these situations, the capitalisation should match that of the language construct, and it should be surrounded in backticks (```).

Table of Contents

All files should contain a table of contents that shows headings at levels two and three. This should be placed directly before the first level-two heading.

It should be formatted as follows, with the key elements being:

  • Each entry should be a bullet point, with level 2 entries against the baseline and level 3 entries indented by two spaces.
  • The entries should be internal-document links to each of the sections.
  • The title of the entry should match the title of the section to which it is linking.
<!-- MarkdownTOC levels="2,3" autolink="true" -->

- [Level Two](#level-two)
- [Level Two Again](#level-two-again)
  - [Level Three](#level-three)

<!-- /MarkdownTOC -->

These table of contents can be automatically generated by plugins to common editors.

A document needing its table of contents to show level four entries is usually indicative of portions of the document needing to be extracted. If you feel that you have a situation where this is not the case, please talk to a documentation code owner.

In the Future

As prettier doesn't enforce all of our markdown style guidelines, in the future a new formatter will be written that will enforce all of our guidelines in one go.