var git = require("nodegit");

// Read a repository
git.repo(".git", function(err, repo) {
  // Success is always 0, failure is always an error string
  if (err) { throw err; }

  // Use the master branch
  repo.branch("master", function(err, branch) {
    if (err) { throw err; }

    // Iterate over the revision history
    var history = branch.history();
    
    // Commit event emits commit object
    history.on("commit", function(commit) {
      // Print out `git log` emulation
      console.log("commit " + commit.sha);
      console.log(commit.author.name + "<" + commit.author.email + ">");
      console.log(commit.time);
      console.log("\n");
      console.log(commit.message);
      console.log("\n");
    });
  });
});

var git = require( 'nodegit' ).raw;

// Create instance of Repo constructor
var repo = new git.Repo();

// Read a repository
repo.open( '.git', function( err ) {
    // Err is an integer, success is 0, use strError for string representation
    if( err ) {
        var error = new git.Error();
        throw error.strError( err );
    }

    // Create instance of Ref constructor with this repository
    var ref = new git.Ref( repo );
    
    // Find the master branch
    repo.lookupRef( ref, '/refs/heads/master', function( err ) {
        if( err ) {
          var error = new git.Error();
          throw error.strError( err );
        }

        // Create instance of Commit constructor with this repository
        var commit = new git.Commit( repo ),
            // Create instance of Oid constructor
            oid = new git.Oid();

        // Set the oid constructor internal reference to this branch reference
        ref.oid( oid );

        // Lookup the commit for this oid
        commit.lookup( oid, function() {
            if( err ) {
              var error = new git.Error();
              throw error.strError( err );
            }

            // Create instance of RevWalk constructor with this repository
            var revwalk = new git.RevWalk( repo );

            // Push the commit as the start to walk
            revwalk.push( commit );

            // Recursive walk
            function walk() {
                // Each revision walk iteration yields a commit
                var revisionCommit = new git.Commit( repo );

                revwalk.next( revisionCommit, function( err ) {
                    // Finish recursion once no more revision commits are left
                    if( err ) { return; }

                    // Create instance of Oid for sha
                    var oid = new git.Oid();

                    // Set oid to the revision commit
                    revisionCommit.id( oid );

                    // Create instance of Sig for author
                    var author = new git.Sig();

                    // Set the author to the revision commit author
                    revisionCommit.author( author );

                    // Convert timestamp to milliseconds and set new Date object
                    var time = new Date( revisionCommit.time() * 1000 );

                    // Print out `git log` emulation
                    console.log( oid.toString( 40 ) );
                    console.log( author.name() + '<' + author.email() + '>' );
                    console.log( time );
                    console.log( '\n' );
                    console.log( revisionCommit.message() );
                    console.log( '\n' );

                    // Recurse!
                    walk();
                });
            }

            // Initiate recursion
            walk():
        });
    });
});