Substack Rube Goldburg Challenge: runs some input through as many of substack's npm modules as possible.

mkManifest.js

var fs = require('fs');
var exec = require('child_process').exec;

var templ_ = fs.readFileSync('package.json.template', { encoding: 'UTF-8' });
var templ  = JSON.parse(templ_);

var deps = {};
exec("npm search substack | grep '=substack' | awk '{ print $1 }'", function(err, stdout) {
    var lines = stdout.toString('UTF-8');
    lines.split("\n").forEach(function(line) {
        if (line) {
            deps[line] = "*";
        }
    });
    templ.dependencies = deps;
    fs.writeFileSync('package.json', JSON.stringify(templ), { encoding: 'UTF-8' });
});

package.json.template

{
  "name": "rube-substack",
  "version": "1.0.0",
  "description": "Automated usefulness",
  "author": {
    "name": "12 Event Horizon"
  },
  "engines": {
    "node": ">= 0.10.0"
  },
  "dependencies": {}
}

rube-substack.js

var fs = require('fs');
var exec = require('child_process').exec;
var spawn = require('child_process').spawn;

var manifest = JSON.parse(fs.readFileSync('package.json'));
var deps = Object.keys(manifest.dependencies);
var input = {'hackerolympics': 'dope', 'chipotle': {'price': 'nope', 'originality':'nope'}};

(function applyModules(deps, input, count) {
    if (deps.length < 1) {
        console.log("Ran through " + count + " modules: ");
        console.log(input);
        return;
    }

    install(deps[0], function(err) {
        // console.log('applying ' + deps[0]);

        var output = input, count_ = count;
        var mod = {};
        var out;
        console.log('trying', deps[0]);
        try {
            if (deps[0] !== 'browser-launcher') {
                mod = err ? {} : require(deps[0]);
            }
        }
        catch (_) {
            console.log('could not load, '+ deps[0]);
        }

        var fs = extractFuncs(mod);
        for (var i = 0; i < fs.length; i += 1) {
            try {
                out = fs[i](input);
            }
            catch (_) {}
            if (!!out) {
                console.log(count_ + 1, deps[0], out);
                output = out;
                count_ += 1;
                break;
            }
        }

        applyModules(deps.slice(1), output, count_);
    });

}(deps, input, 0));

function extractFuncs(mod, input) {
    return Object.keys(mod).map(function(k) {
        if (mod.hasOwnProperty(k) && typeof mod[k] === 'function') {
            return mod[k];
        }
    }).filter(function(f) {
        return !!f;
    });
}

function install(mod, fn) {
    reset(function() {
        var installer = spawn('npm', ['install', mod]);
        installer.on('close', function(code) {
            if (code == 0) {
                fn(null, mod);
            }
            else {
                fn(code);
            }
        });
    });
}

function reset(fn) {
    exec('rm -rf node_modules/', fn);
}