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const visit = require('unist-util-visit');
const PLUGIN_NAME = 'remark-mermaid-simple';
/**
* Given the MDAST ast, look for all fenced codeblocks that have a language of
* `mermaid` and pass that to mermaid.cli to render the image. Replaces the
* codeblocks with an image of the rendered graph.
*
* @param {object} ast
* @param {vFile} vFile
* @return {function}
*/
function visitCodeBlock(ast, vFile) {
return visit(ast, 'code', (node, index, parent) => {
const { lang, value, position } = node;
const destinationDir = getDestinationDir(vFile);
// If this codeblock is not mermaid, bail.
if (lang !== 'mermaid') {
return node;
}
const image = {
type: 'mermaid',
value: value,
data: {
hName: 'div',
hProperties: {
className: 'mermaid'
},
hChildren: [
{
type: 'text',
value: value
}
]
}
};
parent.children.splice(index, 1, image);
return node;
});
}
/**
* Returns the transformer which acst on the MDAST tree and given VFile.
*
* @link https://github.com/unifiedjs/unified#function-transformernode-file-next
* @link https://github.com/syntax-tree/mdast
* @link https://github.com/vfile/vfile
* @return {function}
*/
function mermaid() {
/**
* @param {object} ast MDAST
* @param {vFile} vFile
* @param {function} next
* @return {object}
*/
return function transformer(ast, vFile, next) {
visitCodeBlock(ast, vFile);
if (typeof next === 'function') {
return next(null, ast, vFile);
}
return ast;
};
}
module.exports = mermaid;
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