feat: use go tool
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# `MD041` - First line in a file should be a top-level heading
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Tags: `headings`
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Aliases: `first-line-h1`, `first-line-heading`
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Parameters:
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- `allow_preamble`: Allow content before first heading (`boolean`, default
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`false`)
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- `front_matter_title`: RegExp for matching title in front matter (`string`,
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default `^\s*title\s*[:=]`)
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- `level`: Heading level (`integer`, default `1`)
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This rule is intended to ensure documents have a title and is triggered when
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the first line in a document is not a top-level ([HTML][HTML] `h1`) heading:
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```markdown
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This is a document without a heading
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```
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To fix this, add a top-level heading to the beginning of the document:
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```markdown
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# Document Heading
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This is a document with a top-level heading
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```
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Because it is common for projects on GitHub to use an image for the heading of
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`README.md` and that pattern is not well-supported by Markdown, HTML headings
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are also permitted by this rule. For example:
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```markdown
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<h1 align="center"><img src="https://placekitten.com/300/150"/></h1>
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This is a document with a top-level HTML heading
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```
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In some cases, a document's title heading may be preceded by text like a table
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of contents. This is not ideal for accessibility, but can be allowed by setting
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the `allow_preamble` parameter to `true`.
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```markdown
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This is a document with preamble text
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# Document Heading
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```
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If [YAML][YAML] front matter is present and contains a `title` property
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(commonly used with blog posts), this rule will not report a violation. To use a
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different property name in the front matter, specify the text of a [regular
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expression][RegExp] via the `front_matter_title` parameter. To disable the use
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of front matter by this rule, specify `""` for `front_matter_title`.
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The `level` parameter can be used to change the top-level heading (ex: to `h2`)
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in cases where an `h1` is added externally.
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Rationale: The top-level heading often acts as the title of a document. More
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information: <https://cirosantilli.com/markdown-style-guide#top-level-header>.
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[HTML]: https://en.wikipedia.org/wiki/HTML
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[RegExp]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Regular_expressions
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[YAML]: https://en.wikipedia.org/wiki/YAML
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