multiplatform code to find a local binary on user input.

search_bin.js

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

var DEBUT = Date.now();

var USER_INPUT = process.argv[2],
    FOUND_BINARY,
    PATH_TO_BINARY;

var searchPaths = {
    linux: [],
    darwin: [],
    win32: []
};

var addPath = function (path) {
    if (fs.existsSync(path)) {
        searchPaths[process.platform].push(path);
    }
};

// linux
addPath('/usr/bin');
addPath('/usr/local/bin');
// darwin
addPath('/Applications');
addPath(process.env.HOME + '/Applications');
// win32
addPath(process.env.SystemDrive + '\\Program Files\\');
addPath(process.env.SystemDrive + '\\Program Files (x86)\\');
addPath(process.env.LOCALAPPDATA + '\\Apps\\2.0\\');

async.each(searchPaths[process.platform], function (folderName, pathcb) {
    folderName = path.resolve(folderName);
    console.log('Scanning: ' + folderName);
    var appIndex = -1;
    var fileStream = require('readdirp')({
        root: folderName,
        depth: 3
    });
    fileStream.on('data', function (d) {
        var app = d.name.replace('.app', '').replace('.exe', '').toLowerCase();
        var match = app === USER_INPUT.trim().toLowerCase();

        if (match) {
            FOUND_BINARY = app;
            PATH_TO_BINARY = d.fullPath;
            console.info('Found External Binary: ' + FOUND_BINARY + ' in ' + d.fullParentDir);
            return;
        }
    });
    fileStream.on('end', function () {
        pathcb();
    });
}, function (err) {

    if (err) {
        console.error('External Binaries: scan', err);
        return;
    } else {
        console.log('External Binaries: scan finished in %s milliseconds', Date.now() - DEBUT);
        if (!FOUND_BINARY) {
            console.log('%s not found :(', USER_INPUT);
        } else {
            console.log('Full path to %s is: %s', FOUND_BINARY, PATH_TO_BINARY)
        }
        return;
    }
});