var git = require('../'),

RevWalk = git.Revwalk;

// Backwards compatibility.

Object.defineProperty(git, "RevWalk", {

value: RevWalk,

enumerable: false

});

var oldSorting = RevWalk.prototype.sorting;

/**

* Refer to vendor/libgit2/include/git2/revwalk.h for sort definitions.

*/

RevWalk.Sort = {

None: 0,

Topological: 1,

Time: 2,

Reverse: 4

};

/**

* Set the sort order for the revwalk. This function takes variable arguments

* like `revwalk.sorting(git.RevWalk.Topological, git.RevWalk.Reverse).`

*

* @param {Number} sort

*/

RevWalk.prototype.sorting = function() {

var sort = 0;

for (var i = 0; i < arguments.length; i++)

sort |= arguments[i];

oldSorting.call(this, sort);

};

/**

* Walk the history from the given oid. The callback is invoked for each commit;

* When the walk is over, the callback is invoked with `(null, null)`.

*

* @param {Oid} oid

* @param {Function} callback

* @return {Commit}

*/

RevWalk.prototype.walk = function(oid, callback) {

var self = this;

this.push(oid, function revWalkPush(error) {

if (error) return callback(error);

function walk() {

self.next(function revWalkNext(error, oid) {

if (error) return callback(error);

if (!oid) return callback();

self.repo.getCommit(oid, function revWalkCommitLookup(error, commit) {

if (error) return callback(error);

callback(null, commit);

walk();

});

});

}

walk();

});

};