code-highlighting.js
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	/**
	* Copyright (C) 2018 The Software Heritage developers
	* See the AUTHORS file at the top-level directory of this distribution
	* License: GNU Affero General Public License version 3, or any later version
	* See top-level LICENSE file for more information
	*/

	import {removeUrlFragment} from 'utils/functions';

	export async function highlightCode(showLineNumbers = true) {

	await import(/* webpackChunkName: "highlightjs" */ 'utils/highlightjs');

	// keep track of the first highlighted line
	let firstHighlightedLine = null;
	// highlighting color
	let lineHighlightColor = 'rgb(193, 255, 193)';

	// function to highlight a line
	function highlightLine(i) {
	let lineTd = $(`.hljs-ln-line[data-line-number="${i}"]`);
	lineTd.css('background-color', lineHighlightColor);
	return lineTd;
	}

	// function to reset highlighting
	function resetHighlightedLines() {
	firstHighlightedLine = null;
	$('.hljs-ln-line[data-line-number]').css('background-color', 'inherit');
	}

	function scrollToLine(lineDomElt) {
	if ($(lineDomElt).closest('.swh-content').length > 0) {
	$('html, body').animate({
	scrollTop: $(lineDomElt).offset().top - 70
	}, 500);
	}
	}

	// function to highlight lines based on a url fragment
	// in the form '#Lx' or '#Lx-Ly'
	function parseUrlFragmentForLinesToHighlight() {
	let lines = [];
	let linesRegexp = new RegExp(/L(\d+)/g);
	let line = linesRegexp.exec(window.location.hash);
	while (line) {
	lines.push(parseInt(line[1]));
	line = linesRegexp.exec(window.location.hash);
	}
	resetHighlightedLines();
	if (lines.length === 1) {
	firstHighlightedLine = parseInt(lines[0]);
	scrollToLine(highlightLine(lines[0]));
	} else if (lines[0] < lines[lines.length - 1]) {
	firstHighlightedLine = parseInt(lines[0]);
	scrollToLine(highlightLine(lines[0]));
	for (let i = lines[0] + 1; i <= lines[lines.length - 1]; ++i) {
	highlightLine(i);
	}
	}
	}

	$(document).ready(() => {
	// highlight code and add line numbers
	$('code').each((i, block) => {
	hljs.highlightBlock(block);
	if (showLineNumbers) {
	hljs.lineNumbersBlock(block);
	}
	});

	if (!showLineNumbers) {
	return;
	}

	// click handler to dynamically highlight line(s)
	// when the user clicks on a line number (lines range
	// can also be highlighted while holding the shift key)
	$('body').click(evt => {
	if (evt.target.classList.contains('hljs-ln-n')) {
	let line = parseInt($(evt.target).data('line-number'));
	if (evt.shiftKey && firstHighlightedLine && line > firstHighlightedLine) {
	let firstLine = firstHighlightedLine;
	resetHighlightedLines();
	for (let i = firstLine; i <= line; ++i) {
	highlightLine(i);
	}
	firstHighlightedLine = firstLine;
	window.location.hash = `#L${firstLine}-L${line}`;
	} else {
	resetHighlightedLines();
	highlightLine(line);
	window.location.hash = `#L${line}`;
	scrollToLine(evt.target);
	}
	} else if ($(evt.target).closest('.hljs-ln').length) {
	resetHighlightedLines();
	removeUrlFragment();
	}
	});

	// update lines highlighting when the url fragment changes
	$(window).on('hashchange', () => parseUrlFragmentForLinesToHighlight());

	// schedule lines highlighting if any as hljs.lineNumbersBlock() is async
	setTimeout(() => {
	parseUrlFragmentForLinesToHighlight();
	});

	});
	}

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