irc-stats.js

"use strict";

var readline = require("readline");
var fs = require("fs");

// https://echelog.com/logs/browse/angularjs/1476828000
var filename = "irc-angularjs-log-2016-10-20.txt";
var stats = {};

var lineReader = readline.createInterface({
    input: fs.createReadStream(filename)
});

lineReader.on("line", function (line) {
    processLine(line);
});

lineReader.on("close", function () {
    displayStats();
});

function processLine(line) {
    var timeAndNickJoinRegex = new RegExp(/\[([0-9]+):([0-9]+):([0-9]+)\][\s]*\*\*\*[\s]*([^\s]+)([\s]+[^\s]+[\s]*has joined #angularjs)/g);
    var timeAndNickQuitRegex = new RegExp(/\[([0-9]+):([0-9]+):([0-9]+)\][\s]*\*\*\*[\s]*([^\s]+)([\s]+[^\s]+[\s]*has quit IRC)/g);
    var matchesJoin = timeAndNickJoinRegex.exec(line);
    var matchesQuit = timeAndNickQuitRegex.exec(line);
    var matches,
        nick,
        time,
        endOfDay;

    matches = matchesJoin || matchesQuit;
    if (matches) {
        // year, month and day doesn't matter: log is daily
        time = new Date(2016, 0, 1, matches[1], matches[2], matches[3]);
        endOfDay = new Date(2016, 0, 1, 23, 59, 59);
        nick = matches[4];

        if (!stats.hasOwnProperty(nick)) {
            stats[nick] = {};
        }

        if (matchesJoin) {
            stats[nick].in = time;
            stats[nick].out = endOfDay;
            stats[nick].ttl = calcTTL(stats[nick].in, stats[nick].out);
        }

        if (matchesQuit) {
            stats[nick].out = time;
            stats[nick].ttl = calcTTL(stats[nick].in, stats[nick].out);
        }
    }
}

function displayStats() {
    var nicks = Object.keys(stats),
        myStats = [],
        myStatsOrdered;

    nicks.forEach(function (nick) {
        var ttl = stats[nick].ttl;

        myStats.push({
            nick: nick,
            ttl: ttl
        });
    });

    myStatsOrdered = myStats.sort(function (a, b) {
        return b.ttl - a.ttl; // descendent sort
    });

    myStatsOrdered.forEach(function (s) {
        if (s.ttl) {
            console.log(s.nick, s.ttl);
        }
    });
}

function calcTTL(start, end) {
    // time to live in minutes from unix milliseconds
    return Math.round((end - start) / 1000 / 60);
}