permafrost-dev / codeboost

import { execSync } from 'child_process';

import { createHash } from 'crypto';

import { copyFile, copyFileSync, existsSync, lstatSync, mkdirSync, readdir, readdirSync, readFileSync, writeFileSync } from 'fs';

import yaml from 'js-yaml';

import { dirname } from 'path';

import { promisify } from 'util';

export type OnFileCopiedCallback = (src: string, dest: string) => void;

export class Tools {

    /**

     * This function takes a number of milliseconds and returns a promise that

     * resolves after that many milliseconds have passed.

     *

     * This function is used to create a delay in a program, which can be useful

     * for debugging, or for building a user interface with an animation.

     * @param {number} ms - The number of milliseconds to wait.

     * @returns A promise that resolves after the given number of milliseconds.

     */

    public async sleep(ms: number) {

        return new Promise(resolve => setTimeout(resolve, ms));

    }

    /**

     * This function returns true if the file exists, and false if it doesn't

     * @param {string} path - The path to the file you want to check.

     * @returns A boolean value.

     */

    public fileexists(path: string) {

        return existsSync(path);

    }

    /**

     * It reads a file and returns its contents

     * @param {string} path - The path to the file you want to read.

     * @returns The contents of the file at the given path.

     */

    public readfile(path: string) {

        return readFileSync(path, { encoding: 'utf8' });

    }

    /**

     * Write the given content to the given file path.

     * @param {string} path - The path to the file you want to write to.

     * @param {string} content - The content to write to the file.

     */

    public writefile(path: string, content: string) {

        writeFileSync(path, content, { encoding: 'utf8' });

    }

    /**

     * Copies a file from `src` to `dest`. Both `src` and `dest` should be absolute paths.

     * @param {string} src

     * @param {string} dest

     */

    public copyfile(src: string, dest: string) {

        if (!existsSync(dirname(dest))) {

            mkdirSync(dirname(dest), { recursive: true });

        }

        copyFileSync(src, dest);

        return dest;

    }

    /**

     * It takes a file path and returns the sha-256 hash of the file contents.

     * @param {string} path - The path to the file you want to hash.

     * @returns {string} The sha-256 hash of the file.

     */

    public hashfile(path: string) {

        return this.hashstring(this.readfile(path));

    }

    /**

     * It takes a string and returns the sha-256 hash.

     * @param {string} str - The string you want to hash.

     * @returns {string} The sha-256 hash of the string.

     */

    public hashstring(str: string) {

        return createHash('sha256').update(str)

            .digest('hex')

            .toLowerCase();

    }

    /**

     * This function returns true if the two files have the exact same contents

     * @param {string}

     * @param {string}.

     */

    public filesAreEqual(file1: string, file2: string) {

        if (!this.fileexists(file1) || !this.fileexists(file2)) {

            return false;

        }

        return this.hashfile(file1) === this.hashfile(file2);

    }

    /**

     * It reads a yaml file and returns the contents as an object.

     * @param {string} path - The path to the file you want to read.

     * @returns {object}

     */

    public readYaml(path: string) {

        return yaml.load(this.readfile(path));

    }

    /**

     * It dumps an object to yaml and saves it to the given path.

     * @param {string} path - The path to the file you want to write to.

     * @param {any} data

     */

    public writeYaml(path: string, data: any) {

        this.writefile(path, yaml.dump(data));

    }

    /**

     * It reads a json file and returns the parsed contents as an object.

     * @param {string} path - The path to the file you want to read.

     * @returns {object}

     */

    public readJson(path: string) {

        return JSON.parse(this.readfile(path));

    }

    /**

     * It writes a JSON file to the specified path.

     * @param {string} path - The path to the file you want to write to.

     * @param {any} data - The content to write to the file.

     */

    public writeJson(path: string, data: any) {

        this.writefile(path, JSON.stringify(data, null, 4));

    }

    /**

     * A function that recursively copies a files from one directory to another. Files that already exist

     * at the destination are overwritten, and directories that do not exist are created.

     *

     * Returns a list of filenames that were copied.

     *

     * @param {string} src - The source directory.

     * @param {string} dest - The destination directory.

     * @param {function|null} onCopiedCallback - A callback function that is called after each file is copied.

     * @returns {string[]}

     */

    public recursiveDirectoryCopy(src: string, dest: string, onCopiedCallback: OnFileCopiedCallback | null = null) {

        const files: string[] = [];

        const handler = (src, dest) => {

            readdirSync(src).forEach(file => {

                const srcFn = src + '/' + file;

                const destFn = dest + '/' + file;

                const stats = lstatSafe(srcFn);

                this.handleFilesForDirectoryCopy({

                    stats,

                    srcFn,

                    destFn,

                    files: new Proxy(files, {}),

                    onCopiedCallback,

                });

                this.handleDirectoriesForDirectoryCopy({

                    stats,

                    srcFn,

                    destFn,

                    handler,

                });

            });

        };

        handler(src, dest);

        return files;

    }

    protected handleDirectoriesForDirectoryCopy({

        stats, srcFn, destFn, handler 

    }) {

        if (!stats?.isDirectory()) {

            return;

        }

        if (!this.fileexists(destFn)) {

            mkdirSync(destFn, { recursive: true });

        }

        handler(srcFn, destFn);

    }

    protected handleFilesForDirectoryCopy({

        stats, srcFn, destFn, files, onCopiedCallback 

    }) {

        if (!stats?.isFile() || this.filesAreEqual(srcFn, destFn)) {

            return;

        }

        files.push(this.copyfile(srcFn, destFn));

        if (onCopiedCallback) {

            onCopiedCallback(srcFn, destFn);

        }

    }

}