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Port external gatsby-remark-autolink-headers plugin
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let offsetY = 0; | ||
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const getTargetOffset = hash => { | ||
const id = window.decodeURI(hash.replace(`#`, ``)); | ||
if (id !== ``) { | ||
const element = document.getElementById(id); | ||
if (element) { | ||
return element.offsetTop - offsetY; | ||
} | ||
} | ||
return null; | ||
}; | ||
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exports.onInitialClientRender = (_, pluginOptions) => { | ||
if (pluginOptions.offsetY) { | ||
offsetY = pluginOptions.offsetY; | ||
} | ||
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requestAnimationFrame(() => { | ||
const offset = getTargetOffset(window.location.hash); | ||
if (offset !== null) { | ||
window.scrollTo(0, offset); | ||
} | ||
}); | ||
}; | ||
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exports.shouldUpdateScroll = ({routerProps: {location}}) => { | ||
const offset = getTargetOffset(location.hash); | ||
return offset !== null ? [0, offset] : true; | ||
}; |
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const React = require(`react`); | ||
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const pluginDefaults = { | ||
className: `anchor`, | ||
icon: true, | ||
offsetY: 0, | ||
}; | ||
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exports.onRenderBody = ({setHeadComponents}, pluginOptions) => { | ||
const {className, icon, offsetY} = Object.assign( | ||
pluginDefaults, | ||
pluginOptions, | ||
); | ||
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const styles = ` | ||
.${className} { | ||
float: left; | ||
padding-right: 4px; | ||
margin-left: -20px; | ||
} | ||
h1 .${className} svg, | ||
h2 .${className} svg, | ||
h3 .${className} svg, | ||
h4 .${className} svg, | ||
h5 .${className} svg, | ||
h6 .${className} svg { | ||
visibility: hidden; | ||
} | ||
h1:hover .${className} svg, | ||
h2:hover .${className} svg, | ||
h3:hover .${className} svg, | ||
h4:hover .${className} svg, | ||
h5:hover .${className} svg, | ||
h6:hover .${className} svg, | ||
h1 .${className}:focus svg, | ||
h2 .${className}:focus svg, | ||
h3 .${className}:focus svg, | ||
h4 .${className}:focus svg, | ||
h5 .${className}:focus svg, | ||
h6 .${className}:focus svg { | ||
visibility: visible; | ||
} | ||
`; | ||
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const script = ` | ||
document.addEventListener("DOMContentLoaded", function(event) { | ||
var hash = window.decodeURI(location.hash.replace('#', '')) | ||
if (hash !== '') { | ||
var element = document.getElementById(hash) | ||
if (element) { | ||
var offset = element.offsetTop | ||
// Wait for the browser to finish rendering before scrolling. | ||
setTimeout((function() { | ||
window.scrollTo(0, offset - ${offsetY}) | ||
}), 0) | ||
} | ||
} | ||
}) | ||
`; | ||
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const style = icon ? ( | ||
<style key={`gatsby-remark-autolink-headers-style`} type="text/css"> | ||
{styles} | ||
</style> | ||
) : ( | ||
undefined | ||
); | ||
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return setHeadComponents([ | ||
style, | ||
<script | ||
key={`gatsby-remark-autolink-headers-script`} | ||
dangerouslySetInnerHTML={{__html: script}} | ||
/>, | ||
]); | ||
}; |
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/*! | ||
* Based on 'gatsby-remark-autolink-headers' | ||
* Original Author: Kyle Mathews <mathews.kyle@gmail.com> | ||
* Copyright (c) 2015 Gatsbyjs | ||
*/ | ||
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const toString = require('mdast-util-to-string'); | ||
const visit = require('unist-util-visit'); | ||
const slugs = require('github-slugger')(); | ||
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function patch(context, key, value) { | ||
if (!context[key]) { | ||
context[key] = value; | ||
} | ||
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return context[key]; | ||
} | ||
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const svgIcon = `<svg aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg>`; | ||
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module.exports = ( | ||
{markdownAST}, | ||
{icon = svgIcon, className = `anchor`, maintainCase = false}, | ||
) => { | ||
slugs.reset(); | ||
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visit(markdownAST, 'heading', node => { | ||
const id = slugs.slug(toString(node), maintainCase); | ||
const data = patch(node, 'data', {}); | ||
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patch(data, 'id', id); | ||
patch(data, 'htmlAttributes', {}); | ||
patch(data, 'hProperties', {}); | ||
patch(data.htmlAttributes, 'id', id); | ||
patch(data.hProperties, 'id', id); | ||
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if (icon !== false) { | ||
node.children.unshift({ | ||
type: 'link', | ||
url: `#${id}`, | ||
title: null, | ||
data: { | ||
hProperties: { | ||
'aria-hidden': true, | ||
class: className, | ||
}, | ||
hChildren: [ | ||
{ | ||
type: 'raw', | ||
// The Octicon link icon is the default. But users can set their own icon via the "icon" option. | ||
value: icon, | ||
}, | ||
], | ||
}, | ||
}); | ||
} | ||
}); | ||
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return markdownAST; | ||
}; |
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{ | ||
"name": "gatsby-remark-header-custom-ids", | ||
"version": "0.0.1" | ||
} |
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