convert powerpoint pdf svgs into pngs for use on courses

kokanu.mjs

#!/usr/bin/env node

// mkdir input && mkdir cleaned && mkdir raster
// pdf2svg Logography\ for\ Kokanu.pdf input/kokanu_%d.svg all
// node kokanu.mjs pre
// node kokanu.mjs post

import fs from 'fs/promises'
import fsx from 'fs'
import readline from 'readline'

import { spawn } from 'child_process'

const inputDirectory = 'input'
const cleanedDirectory = 'cleaned'
const rasterDirectory = 'raster'

async function removeFluff(inFileName, outFileName)
{
    const fileStream = fsx.createReadStream(`${inputDirectory}/${inFileName}.svg`)

    const lineReader = readline.createInterface(
    {
        input: fileStream,
        crlfDelay: Infinity
    })
    
	const lines = []
    for await (const line of lineReader)
    {
		lines.push(line)
    }
        
	const cleaned = lines
		.filter(line =>
			line.startsWith("<?xml")
			|| line.startsWith("<svg")
			|| line.startsWith("</svg>")
			|| (line.startsWith("<path")
				&& line.includes("stroke-width")))
		.join("\n")
	
	await fs.writeFile(`${cleanedDirectory}/${outFileName}.svg`, cleaned)
}

async function finalize(fileName)
{

	const convertToPNG = spawn('convert', [
		'-background', 'none',
		'+level-colors', 'transparent,black',
		'-gravity', 'center',
		'-extent', '400x400',
		'-format', 'png',
		`${cleanedDirectory}/${fileName}.svg`,
		`${rasterDirectory}/${fileName}.png`])
	
	await new Promise((resolve, reject) => {
        convertToPNG.on('close', resolve);
    });

	const trimPNG = spawn('mogrify', [
		'-trim',
		`${rasterDirectory}/${fileName}.png`])
	
	await new Promise((resolve, reject) => {
        trimPNG.on('close', resolve);
    });

	const resizePNG = spawn('mogrify', [
		'-background', 'transparent',
		'-resize', '400x400',
		'-gravity', 'center',
		'-extent', '400x400',
		`${rasterDirectory}/${fileName}.png`])
	
	await new Promise((resolve, reject) => {
        resizePNG.on('close', resolve);
    });
}

let end = false

async function main()
{
	var args = process.argv.slice(2);
	
	const fileStream = fsx.createReadStream(`words.txt`)

    const lineReader = readline.createInterface(
    {
        input: fileStream,
        crlfDelay: Infinity
    })
    
	const words = []
    for await (const line of lineReader)
    {
		words.push(line)
    }
	await words.forEach(async (word, i) =>
	{
		if (args[0] == 'pre')
		{
			await removeFluff(`kokanu_${i+3}`, word)
		}
		else if (args[0] == 'post')
		{
			await finalize(word)
		} else
		{
			throw new Error("invalid subcommand")
		}
	})
	end = true
}

main()

function wait()
{
	if (!end) setTimeout(wait, 1000)
}
wait()

I then use this to fix the ones that have been filled in incorrectly:

LOGOGRAM=napa && convert -background none -gravity center -extent 400x400 -format png cleaned/$LOGOGRAM.svg raster/$LOGOGRAM.png && mogrify -trim raster/$LOGOGRAM.png && m
ogrify -transparent white -fuzz 70% raster/$LOGOGRAM.png && convert +level-colors transparent,black raster/$LOGOGRAM.png raster/$LOGOGRAM.png && mogrify -background transparent -r
esize 400x400 -gravity center -extent 400x400 raster/$LOGOGRAM.png