Couple of node scripts to convert GIF sprites to PNG format for TWoTS OpenXcom mod

convert.js

/**
 * This scripts takes a list of filenames from `files.txt` and converts
 * all of them to PNG format.
 * 
 * File list can either be generated by running `extra-sprites.js` script
 * or by using `find` utility from mod folder.
 * ```
 * [OpenXcom/mods/TWoTS] > find . -iname \*.gif > files.txt
 * ```
 */
const fs = require('fs');
const path = require('path');
const gm = require('gm');

const base_dir = process.env['HOME'] + '/Library/Application Support/OpenXcom/mods/TWoTS/';
const files = fs.readFileSync('./files.txt')
                .toString()
                .trim() // remove trailing whitespace
                .split("\n");

const paths = files.map((resource_path) => {
    return path.join(base_dir, resource_path);
});

function processImages(paths) {
    paths.map((image_path) => {
        const ext = path.extname(image_path);

        const new_filename = image_path.slice(0, -ext.length) + '.png';
        if (!fs.existsSync(new_filename)) {
            gm(image_path)
                .write(new_filename, (err) => {
                    if (err) {
                        console.error("Error during write", err);
                    }
                });
        }
    });
}

processImages(paths);

extra-sprites.js

/**
 * This script goes through all of the GIF filenames from ExtraSprites.rul,
 * checks if "converted" (PNG) version of that filename exists and spits out
 * ExtraSprites.rul content with updated filenames.
 * 
 * If the "converted" files do not exist, original filenames will be appended to `files.txt`
 * in script's directory.
 */ 

const fs = require('fs');
const yaml = require('js-yaml');

const base_dir = process.env['HOME'] + '/Library/Application Support/OpenXcom/mods/TWoTS/';

const extra_sprites_text = fs.readFileSync(base_dir + "Ruleset/ExtraSprites.rul.bak").toString();
const extra_sprites = yaml.load(extra_sprites_text).extraSprites;
const resource_files = extra_sprites.reduce((carry, value) => {
    return carry.concat(Object.values(value.files));
}, []);

const updated_text = resource_files.reduce((config_text, resource_path) => {
    if (
        fs.existsSync(base_dir + resource_path)
        && (/\.gif$/i).test(resource_path) 
    ) {
        const new_name = resource_path.replace(/\.gif$/i, '.png');

        const is_converted = fs.existsSync(base_dir + new_name);

        if (is_converted) {
            return config_text.replace(resource_path, new_name);            
        } else {
            fs.appendFile("./files.txt", resource_path + "\n", (err) => {if (err) throw err});
        }
    } else {

    }

    return config_text;
}, extra_sprites_text);

if (updated_text == extra_sprites_text) {
    console.log("File list created");
} else {
    process.stdout.write(updated_text);
}