gatsby-remark-vega/dist/node.js

Adds the ability to include a [Vega](https://vega.github.io/vega/) visualization from a markdown file.

"use strict";

var visit = require('unist-util-visit');

var getPageDir = function getPageDir(_ref) {
  var parent = _ref.parent;
  return parent.split(" ").shift().split("/").slice(0, -1).join("/");
};
var escape = function escape(txt) {
  return txt.replace(/"/g, '"');
};

var MARKDOWN_TAG = "vega";

module.exports = function (_ref2) {
  var markdownNode = _ref2.markdownNode,
      markdownAST = _ref2.markdownAST;

  visit(markdownAST, "inlineCode", function (node) {
    var value = node.value;


    if (value.startsWith(MARKDOWN_TAG + ":")) {
      var dir = getPageDir(markdownNode);
      var file = value.split(':').pop();
      var path = dir + "/" + file;

      console.log('require fs!');
      var fs = require("fs");
      if (!fs.existsSync(path)) {
        throw Error("Invalid file specified; no such file \"" + path + "\"");
      }

      var spec = fs.readFileSync(path, "utf8");

      node.type = "html";
      node.value = "<vega spec=\"" + escape(spec) + "\" />";
    }
  });

  return markdownAST;
};