Convert lyx file to markdown and BBcode

README.md

rips off all the sample code from the projects composer uses, as well as https://codepen.io/MrHuds0n/full/bgWdqe for the bbcode output.

usage:

composer install
# (put a single .lyx file into the directory)
sh generate.sh

edit generate.sh as needed to fix paths (you'll need to do this, trust me). also check out the top of mdToBBC.php.

this code is all shit patched together with more shit, so that it can handle my very specific and narrow use case.

composer.json

{
    "require": {
        "league/html-to-markdown": "^4.4",
        "michelf/php-markdown": "^1.7"
    }
}

generate.sh

# clean old files
rm *.xhtml _markdown.md _html.html _bbcode.txt

/e/program\ files\ \(x86\)/LyX\ 2.3/bin/lyx --export xhtml *.lyx

cat *.xhtml      | php htmlToMD.php > _markdown.md
cat _markdown.md | php MDToHTML.php > _html.html
cat _markdown.md | php mdToBBC.php  > _bbcode.txt

htmlToMD.php

<?php 

require 'vendor/autoload.php';

use League\HTMLToMarkdown\HtmlConverter;

$converter = new HtmlConverter();
$converter->getConfig()->setOption('strip_tags', true);

$html = file_get_contents("php://stdin");
$markdown = $converter->convert($html);

$filter = "Chapter 1";
/**
 * everything up to and including $filter will be trimmed.
 * use to eliminate the xml tag and css shit
 **/

echo trim(substr($markdown, strpos($markdown, $filter) + strlen($filter)));

mdToBBC.php

<?php
$h1replace = "[size=7][b]$1[/b][/size]";
$h2replace = "[hr][size=6]$1[/size]";
$h3replace = "[size=4]$1[/size]";

$h1regex = "/# (.*?)(?:\\ *)\\n/";
$h2regex = "/## (.*?)(?:\\ *)\\n/";
$h3regex = "/### (.*?)(?:\\ *)\n/";

$h1regexUnderline = "/(.*?)\\n={3,}/";
$h2regexUnderline = "/(.*?)\\n-{3,}/";

$boldItalicRegex = "/(?:\\*\\*\\*|___)(.*?)(?:\\*\\*\\*|___)(?![^\\[]*\\])/";
$boldRegex = "/(?:\\*\\*|__)(.*?)(?:\\*\\*|__)(?![^\\[]*\\])/";
$italicRegex = "/(?:\\*|_)(.*?)(?:\\*|_)(?![^\\[]*\\])/";
$strikethroughRegex = "/~~(.*?)~~/";

$imgRegex = "/!\\[(?:.*?)\\]\\((.*?)\\)/";
$urlRegex = "/\\[(.*?)\\]\\((.*?)\\)/";
$codeRegex = "/```(?:\\ *)\\n(.*?)(?:\\ *)\\n```/";

//Set replace values for headers

$output = file_get_contents("php://stdin");

$output = preg_replace($h3regex, $h3replace, $output);

$output = preg_replace($h2regex, $h2replace, $output);
$output = preg_replace($h2regexUnderline, $h2replace, $output);

$output = preg_replace($h1regex, $h1replace, $output);
$output = preg_replace($h1regexUnderline, $h1replace, $output);

$output = preg_replace($imgRegex, "[img]$1[/img]", $output);
$output = preg_replace($urlRegex, "[url=$2]$1[/url]", $output);
$output = preg_replace($codeRegex, "[code]$1[/code]", $output);

$output = preg_replace($boldItalicRegex, "[b][i]$1[/i][/b]", $output);
$output = preg_replace($boldRegex, "[b]$1[/b]", $output);
$output = preg_replace($italicRegex, "[i]$1[/i]", $output);
$output = preg_replace($strikethroughRegex, "[s]$1[/s]", $output);

echo $output;

MDToHTML.php

<?php 

require 'vendor/autoload.php';
use Michelf\MarkdownExtra;

$md = file_get_contents("php://stdin");

$html = MarkdownExtra::defaultTransform($md);

echo $html;