comparison/largest/largest-bluebird.js
function (dir, options, internal) {

    // Parse arguments.
    options = options || largest.options;

    // Get all file stats in parallel.
    return fs.readdirAsync(dir)
    .then (function (files) {
        var paths = _.map(files, function (file) { return path.join(dir, file); });
        return Promise.all(_.map(paths, function (path) { return fs.statAsync(path); }))
        .then(function (stats) { return [paths, stats]; });
    })

    // Build up a list of possible candidates, recursing into subfolders if requested.
    .spread(function (paths, stats) {
        return Promise.all(
            _.map(stats, function (stat, i) {
                if (stat.isFile()) return Promise.resolve({ path: paths[i], size: stat.size, searched: 1 });
                return options.recurse ? largest(paths[i], options, true) : Promise.resolve(null);
            })
        );
    })

    // Choose the best candidate.
    .then(function (candidates) {
        return _(candidates)
        .compact()
        .reduce(function (best, cand) {
            if (cand.size > best.size) var temp = cand, cand = best, best = temp;
            best.searched += cand.searched;
            return best;
        });
    })

    // Add a preview if requested (but skip if this is an internal step in a recursive search).
    .then(function (result) {
        if (result && options.preview && !internal) {
            var fd_;
            return fs.openAsync(result.path, 'r')
            .then(function (fd) {
                fd_ = fd;
                var buffer = new Buffer(40);
                return fs.readAsync(fd, buffer, 0, 40, 0);
            })
            .spread(function (bytesRead, buffer) {
                result.preview = buffer.toString('utf-8', 0, bytesRead);
                return fs.closeAsync(fd_);
            })
            .then(function () {
                return result;
            });
        } else {
            return result; // Return without adding preview.
        }
    });
}
function (dir, options, internal) {

    // Parse arguments.
    options = options || largest.options;

    // Get all file stats in parallel.
    return fs.readdirAsync(dir)
    .then (function (files) {
        var paths = _.map(files, function (file) { return path.join(dir, file); });
        return Promise.all(_.map(paths, function (path) { return fs.statAsync(path); }))
        .then(function (stats) { return [paths, stats]; });
    })

    // Build up a list of possible candidates, recursing into subfolders if requested.
    .spread(function (paths, stats) {
        return Promise.all(
            _.map(stats, function (stat, i) {
                if (stat.isFile()) return Promise.resolve({ path: paths[i], size: stat.size, searched: 1 });
                return options.recurse ? largest(paths[i], options, true) : Promise.resolve(null);
            })
        );
    })

    // Choose the best candidate.
    .then(function (candidates) {
        return _(candidates)
        .compact()
        .reduce(function (best, cand) {
            if (cand.size > best.size) var temp = cand, cand = best, best = temp;
            best.searched += cand.searched;
            return best;
        });
    })

    // Add a preview if requested (but skip if this is an internal step in a recursive search).
    .then(function (result) {
        if (result && options.preview && !internal) {
            var fd_;
            return fs.openAsync(result.path, 'r')
            .then(function (fd) {
                fd_ = fd;
                var buffer = new Buffer(40);
                return fs.readAsync(fd, buffer, 0, 40, 0);
            })
            .spread(function (bytesRead, buffer) {
                result.preview = buffer.toString('utf-8', 0, bytesRead);
                return fs.closeAsync(fd_);
            })
            .then(function () {
                return result;
            });
        } else {
            return result; // Return without adding preview.
        }
    });
}
function ( dir , options , internal ) { // Parse arguments. options = options || largest . options ; // Get all file stats in parallel. return fs . readdirAsync ( dir ) . then ( function ( files ) { var paths = _ . map ( files , function ( file ) { return path . join ( dir , file ) ; } ) ; return Promise . all ( _ . map ( paths , function ( path ) { return fs . statAsync ( path ) ; } ) ) . then ( function ( stats ) { return [ paths , stats ] ; } ) ; } ) // Build up a list of possible candidates, recursing into subfolders if requested. . spread ( function ( paths , stats ) { return Promise . all ( _ . map ( stats , function ( stat , i ) { if ( stat . isFile ( ) ) return Promise . resolve ( { path : paths [ i ] , size : stat . size , searched : 1 } ) ; return options . recurse ? largest ( paths [ i ] , options , true ) : Promise . resolve ( null ) ; } ) ) ; } ) // Choose the best candidate. . then ( function ( candidates ) { return _ ( candidates ) . compact ( ) . reduce ( function ( best , cand ) { if ( cand . size > best . size ) var temp = cand , cand = best , best = temp ; best . searched += cand . searched ; return best ; } ) ; } ) // Add a preview if requested (but skip if this is an internal step in a recursive search). . then ( function ( result ) { if ( result && options . preview && ! internal ) { var fd_ ; return fs . openAsync ( result . path , 'r' ) . then ( function ( fd ) { fd_ = fd ; var buffer = new Buffer ( 40 ) ; return fs . readAsync ( fd , buffer , 0 , 40 , 0 ) ; } ) . spread ( function ( bytesRead , buffer ) { result . preview = buffer . toString ( 'utf-8' , 0 , bytesRead ) ; return fs . closeAsync ( fd_ ) ; } ) . then ( function ( ) { return result ; } ) ; } else { return result ; // Return without adding preview. } } ) ; }
Finds the largest file in the given directory, optionally performing a recursive search.
@param {string} dir - the directory to search.
@param {object?} options - optional settings: { recurse?: boolean; preview?: boolean }.
@returns {object?} null if no files found, otherwise an object of the form
{ path: string; size: number; preview?: string, searched: number; }
Finds the largest file in the given directory optionally performing a recursive search .