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const crc = require('crc');
const path = require('path');
const imagesUtil = require('../../utils/images');
const fs = require('../../utils/fs');
const LocationUtils = require('../../utils/location');
const editHTMLElement = require('./editHTMLElement');
/**
* Convert all inline PNG images to PNG file
*
* @param {String} rootFolder
* @param {HTMLDom} $
* @return {Promise}
*/
function inlinePng(rootFolder, currentFile, $) {
const currentDirectory = path.dirname(currentFile);
return editHTMLElement($, 'img', ($img) => {
const src = $img.attr('src');
if (!LocationUtils.isDataURI(src)) {
return;
}
// We avoid generating twice the same PNG
const hash = crc.crc32(src).toString(16);
let fileName = hash + '.png';
// Result file path
const filePath = path.join(rootFolder, fileName);
return fs.assertFile(filePath, () => {
return imagesUtil.convertInlinePNG(src, filePath);
})
.then(() => {
// Convert filename to a relative filename
fileName = LocationUtils.relative(currentDirectory, fileName);
// Replace src
$img.attr('src', fileName);
});
});
}
module.exports = inlinePng;
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