Poor person's Apple Health stats for distance run in a year

apple_health_stats.js

import fs, { readFileSync } from 'fs';
import readline from 'readline';

const YEAR = '2021';

function infer(row) {
    const ts = row.match(/startDate=".*?"/g)[0].match(/.?.?.?.?-.?.?-.?.? .?.?:.?.?:.?.? .?.?.?.?.?/)[0]
    const dt = ts.substring(0, 10)
    if (dt.startsWith(YEAR)) {
        const unit = row.match(/unit=".*?"/)[0].match(/".?.?"/)[0].substring(1, 3)
        const v = row.match(/value="(.*?)"/)[0].substring(7);
        const val = parseFloat(v.substring(0, v.length - 1))
        return { dt, val }
    }
}

async function processLineByLine(filename) {
    const fileStream = fs.createReadStream(filename);

    const rl = readline.createInterface({
        input: fileStream,
        crlfDelay: Infinity
    });

    const rows = [];
    for await (const line of rl) {
        const inf = infer(line);
        if (inf) {
            rows.push(inf);
        }
    }

    const perDate = rows.reduce((acc, { dt, val }) => {
        if (acc.has(dt)) {
            acc.set(dt, acc.get(dt) + val)
        } else {
            acc.set(dt, val)
        }
        return acc;
    }, new Map());

    for (const dt of perDate.keys()) {
        console.log(`${dt},${perDate.get(dt)},km`)
    }
}

// grep HKQuantityTypeIdentifierDistanceWalkingRunning /tmp/apple_health_export/export.xml | grep hardware:Watch | grep 2021 > /tmp/running2021.txt
processLineByLine('/tmp/running2021.txt');