Git commit hook for trello.com

post-commit

#!/usr/bin/env node

//please requist your app token from
//https://trello.com/1/connect?key=yourkey&name=git-hook&expiration=never&response_type=token&scope=read,write

var key = "your key";
var token = "your token";
//https://trello.com/board/-/4e9003324a517dad44465056
var board_id = "4e9003324a517dad44465056";
var Trello = require("node-trello");
var t = new Trello(key, token);
var spawn = require('child_process').spawn;
var git = spawn('git', ['log' , '-1' , 'HEAD']);
var data = "";

git.stdout.on('data',function(d){
  data += d;
});

git.on('exit', function(){
  var m = data.match(/(card|close|archive|fix)e?s? \D?([0-9]+)\s+:?\s+(.+)/i);
  if(m){
    var commit = data.match(/commit\s+(.+)/i)[1];
    var author = data.match(/author:\s+([^<]+)/i)[1];
    var date = data.match(/date:\s+(.+)/i)[1];  
    var msg = m[3];   
    //get card
    get_card(board_id, m[2],function(err, data){
      if(err) wran("[ERROR] Cannot find card matching ID " + m[2]);
      else{
        if(m[1].toLowerCase() === 'close'){
          update_card(data['id'], {closed:true}, function(err, data){
            if(err) throw err;
            if(data.closed){
              info('Congratulation! Close card:' + m[2] + "\n" + data.name);
            }else{
              warn('Close does not worked correct.');
            }
          });
        }
        if(/^fix/i.exec(m[1])){
          var text = 'Commit by : '+ author + '\nDate : ' + date + '\nCommit : '+ commit + '\nMessage : ' + msg 
          add_comment(data['id'], text, function (err,data){
            if(err) throw err;
            else info('Submit message for ' + m[2] + " : \n" + data.data.text);
          });
        }
      }
    });
  }else{
    warn('Do you work for production?');
  }
});

var partition = "***************************************************************************";
function info(msg){
  console.log(partition);
  console.log(meg);
  console.log(partition);
}

function warn(msg){
  console.warn(partition);
  console.warn(meg);
  console.warn(partition);
}

function logfun(err, data){
  if(err) throw err;
  console.log(data);
}
function get_card(board_id, card_id, fun){
  fun = fun || logfun;
  t.get("/1/boards/"+ board_id +"/cards/"+card_id, fun);
}

function update_card(card_id, params, fun){
  fun = fun || logfun;
  t.put("/1/cards/"+card_id, params, fun);
}

function add_comment(card_id, comment, fun ){
  fun = fun || logfun;
  t.post("/1/card/"+card_id+ "/actions/comments", {text: comment}, fun);
}

function get_cards(list_id, fun){
  fun = fun || logfun;
  t.get("/1/lists/"+list_id+"/cards", {fields: "idList,closed,name"}, fun)
}

The script works great, thank you!
But quite often the data is empty string (though the commit message is not empty). If I try to commit & undo several times, finally it works. Has this happened to anybody?