This simple script receives a pattern and a csv file with key,value lines and replaces all keys in all files with the respective values. Intended to aid androidX migration using the scripts from

replaceOnFiles.js

'use strict';
/**
* AndroidX class mapping: https://developer.android.com/topic/libraries/support-library/downloads/androidx-class-mapping.csv
* AndroidX artifact mapping: https://developer.android.com/topic/libraries/support-library/downloads/androidx-artifact-mapping.csv
**/

var fs = require('fs'),
    lineReader = require('n-readlines'),
    glob = require('glob');

/**
 * Expects a csv with 2 columns in the format key,value on each line.
 * @param csvFile
 * @returns Returns an object with properties keys and values value
 */
function parseKeyPairCsv(csvFile) {
    const map = {};
    let line;
    const liner = new lineReader(csvFile);

    while (line = liner.next()) {
        const splitted = line.toString().split(",")
        map[splitted[0]] = splitted[1];
    }
    return map;
}

function updateFiles(file, mapping, confirmDeletion) {
    let originalFile = fs.readFileSync(file, 'utf-8');
    let finalFile = originalFile;

    for (let key in mapping) {
        finalFile = finalFile.replace(key, mapping[key]);
    }
    if (originalFile != finalFile) {
        if (confirmDeletion === "-f") {
            fs.writeFileSync(file, finalFile, 'utf-8');
            console.log(`Rewriting ${file}`);
        } else {
            console.log(`Would rewrite ${file}`);
        }
        return 1;
    } else {
        return 0;
    }
}

function updateFile(pattern, mappingFile, confirmDeletion) {
    const mapping = parseKeyPairCsv(mappingFile)

    glob(pattern, {}, (err, files) => {
        let count = 0
        files.forEach(function (file) {
            count += updateFiles(file, mapping, confirmDeletion)
        })
        console.log(`Affected files: ${count}`)
    });
}

let myArgs = process.argv.slice(2);

if (myArgs.length > 1) {
    updateFile(myArgs[0], myArgs[1], myArgs[2])
} else {
    console.error("Sample usage: node replaceOnFiles.js androidApp/**/*.java mappingFile.csv")
    console.error("Command needs a file filter in which to replace the mappings from the csv file on the second argument")
    process.exit(1);
}