renders renamer

renamer.js

#!/bin/node

/* MIT License, (c) 2020 xcmats */

/**
 * usage:
 * $ renamer.js [directory]
 *
 * set env. variable in windows 7+:
 * > setx NODE_PATH C:\Windows\npm
 *
 * > node -r renamer
 *
 */




// ...
var

    {
        readdirSync,
        renameSync,
    } = require("fs"),


    {
        extname,
        resolve,
    } = require("path"),


    print = console.info,


    // ...
    suffixes = [
        "7016-1003",  // 0001
        "7016-5015",  // 0002
        "7016-6018",  // 0003
        "7035-5015",  // 0004
        "7035-7016",  // 0005
        "7035-7035",  // 0006
    ],


    // ...
    matchingRegex = /(.*-)(000[1-6])(\.png)/,


    // ...
    comp3 = f => g => h => x => f(g(h(x))),
    waitForKey = (prompt = "hit some key...") => new Promise(r => {
        print(prompt);
        process.stdin.setRawMode(true);
        process.stdin.resume();
        process.stdin.on("data", comp3(r) (x => x[0]) (Array.from));
    }),


    // ...
    findEntries = dir => {

        let files = [];

        readdirSync(dir, { withFileTypes: true })
            .forEach(entry => {
                if (entry.isDirectory()) {
                    files.push.apply(
                        files,
                        findEntries(resolve(dir, entry.name))
                    );
                } else if (entry.isFile() && extname(entry.name) === ".png") {
                    let match = entry.name.match(matchingRegex);
                    if (match && match[2]) {
                        files.push([
                            resolve(dir),
                            entry.name,
                            [
                                match[1],
                                suffixes[parseInt(match[2], 10) - 1],
                                match[3],
                            ].join(""),
                        ]);
                    }
                }
            });

        return files;

    };




// main
(async () => {

    let dir = resolve(process.argv[2] || "./");

    print(`Finding candidates to rename at '${dir}'...`);

    try {

        let entries = findEntries(dir);

        if (entries.length) {

            print("Rename proposal:");

            entries.forEach(entry =>
                print(`\t'${entry[0]}': '${entry[1]}' -> '${entry[2]}'`)
            );

            let choice = await waitForKey("Make changes on disk? - [y/n]");

            if (String.fromCharCode(choice) === "y") {
                print("Renaming...");
                entries.forEach(entry => {
                    renameSync(
                        resolve(entry[0], entry[1]),
                        resolve(entry[0], entry[2])
                    )
                });
                print("Done!");
            } else {
                print("Cancelled.");
            }

        } else {

            print(`No matches found at '${dir}'.`);

        }

    } catch (ex) {

        print(ex.toString());

    } finally {

        process.exit(0);

    }

})();