MyST Markdown

The Table of Contents is the left-hand navigation for your site. It can either be auto-generated, following some simple heuristics described below, or can be explicitly defined in a _toc.yml using the jb-book format.

myst build --write-toc

This will create a _toc.yml in the current directory, you can read more about the below.

When there is no _toc.yml defined an implicit table of contents is defined by the file system structure. All markdown and notebook files will be found in the working directory and all sub-directories. Filenames are not treated as case sensitive, and files are listed before folders. All hidden directories are ignored (e.g. .git) and the _build directory is also ignored.

### #Filename Transformations

The filenames will also be transformed into url-friendly “slugs” that: remove preceding numbers (unless they are year-like, e.g. 1988-02 or 2022); rename any non-url characters (spaces, underscores, etc.) to -; lowercase the filename; remove any file extensions (e.g. .md or .ipynb); and keep the slug less than 50 characters. If there are duplicates, these will be enumerated with a trailing number (e.g. readme-1).

• 01-notebook.ipynb will become notebook
• 2021_02_presentation.md will remain 2021-02-presentation

### #Title Transformations

If a title is not provided by a notebook or markdown document in the front matter or first heading, the filename is used. The filename is transformed to a title by splitting on camel case, replacing - or _ with spaces, and transforming to title-case.

• 01_MyNotebook.ipynb becomes My Notebook
• my_article.md becomes My Article

### #Root Page

The “root” of a site is the page displayed when someone browses to the index of your site without any pathname. The CLI will choose the root file in the following order:

1. index.md
2. README.md
3. main.md
4. The first .md file found alphabetically
5. index.ipynb
6. README.ipynb
7. main.ipynb
8. The first .ipynb file found alphabetically

## #Defining a _toc.yml using Jupyter Book’s format

The _toc.yml can be defined for a site, and uses the format describe by Jupyter Book, the documentation for the format is fully described in Jupyter Book. Briefly, it defines a format as jb-book and can list a number of chapters with files. The file paths are relative to your _toc.yml file and can optionally include the extension.

format: jb-book
root: index
chapters:
- file: path/to/chapter1
- file: path/to/chapter2

For larger books, you can group the content into parts. Each part has a caption and a list of chapters files can define children using a list of sections.

format: jb-book
root: index
parts:
- caption: Name of Part 1
chapters:
- file: path/to/part1/chapter1
- file: path/to/part1/chapter2
sections:
- file: path/to/part1/chapter2/section1
- caption: Name of Part 2
chapters:
- file: path/to/part2/chapter1
- file: path/to/part2/chapter2

## #Nesting of Files in URLs

You can have any level of nesting in a file-system of your project, however, when it is displayed in the URL in mystjs, these nesting will be flattened to have a single “slug” that is contained in the project.

• project/folder2/01_my_article.md becomes project/my-article

All internal links will automatically be updated, and there is a file property that is exported as metadata. Add .json to the end of any url in your site to see the full data of the page.

If you want to have URL nesting, we suggest splitting your site up into different "projects", which are simply other myst.yml definitions and can all exist in a single Git repository, for example. Each project has its own metadata, and can for example define GitHub links, or any other that will cascade to the various documents in that project.

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