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MD043 - Required heading structure

Tags: headers, headings

Aliases: required-headers, required-headings

Parameters:

  • headers: List of headings (string[], default [])
  • headings: List of headings (string[], default [])
  • match_case: Match case of headings (boolean, default false)

If headings is not provided, headers (deprecated) will be used.

This rule is triggered when the headings in a file do not match the array of headings passed to the rule. It can be used to enforce a standard heading structure for a set of files.

To require exactly the following structure:

# Head
## Item
### Detail

Set the headings parameter to:

[
    "# Head",
    "## Item",
    "### Detail"
]

To allow optional headings as with the following structure:

# Head
## Item
### Detail (optional)
## Foot
### Notes (optional)

Use the special value "*" meaning "zero or more unspecified headings" or the special value "+" meaning "one or more unspecified headings" and set the headings parameter to:

[
    "# Head",
    "## Item",
    "*",
    "## Foot",
    "*"
]

When an error is detected, this rule outputs the line number of the first problematic heading (otherwise, it outputs the last line number of the file).

Note that while the headings parameter uses the "## Text" ATX heading style for simplicity, a file may use any supported heading style.

By default, the case of headings in the document is not required to match that of headings. To require that case match exactly, set the match_case parameter to true.

Rationale: Projects may wish to enforce a consistent document structure across a set of similar content.