Motivation Ball, scrapes from InspirationalShit.com

motivation-ball.js

#!/usr/bin/node
var fs = require('fs');
var os = require('os');
var path = require('path');
var request = require('request');
var cheerio = require('cheerio');
var exec = require('child_process').exec;
var icon = '/home/rico/.local/share/icons/hicolor/Chibi-PNG-File.png';

/**
 * Shows a quote via notify-osd
 * @param  {string} quote the content of the quote
 * @param  {string} cite  the speaker of the quote
 * @return {undefined}
 */
function showQuote(quote, cite) {
    quote = quote.trim();
    cite = cite.trim();

    var command = 'notify-send -i '
        + icon + ' '
        + '"'
        + 'Motivation ball'
        + '" "'
        + '\n\n\\"'
        + quote
        + '\\"'
        + ' \n\n\\-'
        + cite
        + '"';

    exec('killall notify-osd', function() {
        exec(command, function(error, stdout, stderr) {
            if (stdout && stdout.length > 0) console.log(stdout);
            if (stderr && stderr.length > 0) console.error(stderr);
        });
    });
};

/**
 * Scrapes a quote from inspirationalshit.com and performs a
 * callback function after scraping.
 * @param  {Function} callback the callback function to call
 *                             after scraping; note that the
 *                             arguments of the function must
 *                             be F(quote, cite)
 * @return {undefined}
 */
function scrapeQuote(callback) {
    var url = 'http://inspirationalshit.com/quotes';
    request(url, function(error, response, html) {
        if (error) console.error("error", error);
        else {
            var $ = cheerio.load(html);
            var quote = $('blockquote p').text().trim();
            var cite = $('blockquote cite').text().trim();
            if (quote.length > 140) {
                scrapeQuote(callback);
            } else if (callback && typeof callback === "function") {
                callback(quote, cite);
            }
        }
    })
};

function buildCache(dir, size) {
    if (!fs.existsSync(dir)) {
        console.log("created cache directory " + dir);
        fs.mkdir(dir, function(err) {
            if (err) console.error(err);
        });
    }
    var cacheFile = path.join(dir, 'quotes.txt');
    fs.writeFile(cacheFile, '', function(err) {
        if (err) return console.error(err);
        for (var i = 0; i < size; ++i) {
            (function(index) {
                scrapeQuote(function(quote, cite) {
                    if (index == 0) showQuote(quote, cite);
                    fs.appendFileSync(cacheFile, quote + '>>>' + cite + '\n');
                    console.log('added quote #' + (index + 1));
                });
            })(i);
        }
    });
};

function popQuoteFromCache(cacheSize) {
    if (!cacheSize) cacheSize = 50;
    var dir = path.join(os.homedir(), '.cache/motivation-ball');
    var cache = path.join(dir, 'quotes.txt');
    if (!fs.existsSync(dir) || !fs.existsSync(cache))
        // nothing exists yet, build cache
        buildCache(dir, cacheSize);
    else {
        // pop lines from cache, get last two entries
        exec('tail -n 1 ' + cache, function(err, stdout, stderr) {
            if (err) return console.error(err);
            // now, stdout holds the quote and the citation info
            lines = stdout.split('>>>');
            if (lines.length != 2) {
                // rebuild cache
                buildCache(dir, cacheSize);
            } else {
                // show quote before truncating
                showQuote(lines[0], lines[1]);
                // pop lines from cache file
                fs.stat(cache, function(err, stats) {
                    if (err) return console.error(err);
                    fs.truncateSync(cache, stats.size - stdout.length, function(err) {
                        if (err) return console.error(err);
                        console.log('popped quote');
                    });
                });
            }
        });
    }
};

popQuoteFromCache();