index.js

#!/usr/bin/env node

var fs = require('fs');
var path = require('path');
var request = require('request');
var async = require('async');

var config = require('yargs')
    .usage('Usage: $0 [options]')
    .describe('repository', 'url to the projects github repository')
    .alias('r', 'repository')
    .help()
    .version()
    .argv;

var url;

if (config.repository) {
    url = config.repository;
} else {
    var pkgPath = path.resolve(path.join(__dirname, '..', '..', 'package.json'));
    if (fs.existsSync(pkgPath)) {
        var pkg = require(pkgPath);
        if (typeof pkg.repository === 'string') {
            url = pkg.repository.replace(/^git\+/, '').replace(/\.git$/, '');
        } else if (typeof pkg.repository === 'object' && pkg.repository.url) {
            url = pkg.repository.url.replace(/^git\+/, '').replace(/\.git$/, '');
        } else {
            console.error('Error: No repository information found in', pkgPath);
            process.exit(1);
        }
        console.log('Found repository', url);
    } else {
        console.error('Error:', pkgPath, 'not found.');
        process.exit(1);
    }
}

request(url, function (err, res, body) {
    if (err || res.statusCode !== 200) {
        console.error('GET', url, res.statusCode, err);
        process.exit(1);
    } else {
        var queue = [];
        body.split('<img ').forEach(function (line) {
            var match = line.match(/^src="(https:\/\/camo\.githubusercontent\.com\/[a-f0-9]+\/[a-f0-9]+)" alt="([^"]+)"/);
            if (match) {
                console.log('Found image', match[2]);
                queue.push({url: match[1], alt: match[2]});
            }
        });
        if (queue.length === 0) {
            console.error('Error: No images found.');
            process.exit(1);
        } else {
            async.mapSeries(queue, function (obj, cb) {
                request({
                    method: 'PURGE',
                    url: obj.url,
                    json: true
                }, function (err, res, body) {
                    if (err) {
                        console.error('Error: PURGE', obj.alt, err);
                    } else {
                        console.log('PURGE', obj.alt, body.status);
                    }
                    cb();
                });
            });
        }
    }
});