Make IIS rewrite map from csv file.

build_IIS_rewriteMap.js

'use strict';
const fs = require('fs');
const readline = require('readline');


const [, , filename] = process.argv;

if (!filename) {
    throw Error('NO FILENAME SPECIFIED');
}

const rl = readline.createInterface({
                                        input: fs.createReadStream(filename, 'utf8')
                                    });

const baseName = filename.split('/').pop().replace('.csv', '');
let output = `<rewriteMap name="${baseName}">`;

const makeRedirectLine = (original, redirect) => `<add key="${original}" value="${redirect}" />`;

let lineNumber = 1;

const processedOriginals = new Set();

rl.on('line', line => {
    if (lineNumber++ < 2) {
        return;
    }

    const [original, redirect] = line.split(',');

    if (original && redirect) {
        if (processedOriginals.has(original)) {
            console.warn(`Duplicate entry: ${original} (line ${lineNumber})`);
        } else {
            processedOriginals.add(original);
            output += '\n\t';
            output += makeRedirectLine(original, redirect);
        }

    }
});

rl.on('close', () => {
    output += '\n</rewriteMap>\n';
    fs.writeFileSync(`${__dirname}/rewritemap_${baseName}.xml`, output);
});