Git branch Nette debugger panel

composer.json

{
    "name":"vvondra/gitbranch-debug-panel",
    "description":"Nette DebugBar panel displaying current project git branch.",
    "keywords":["nette", "debug", "git"],
    "license":["BSD-3"],
    "authors":[
        {
            "name":"Vojtěch Vondra",
            "homepage":"http://www.vojtechvondra.cz"
        }
    ],
    "require":{
        "php":">=5.3.2",
        "nette/nette":"*"
    },
    "autoload":{
        "psr-0":{
            "Vondra":""
        }
    },
    "target-dir":"Vondra"
}

GitBranchPanel.php

<?php

namespace Vondra;

class GitBranchPanel implements \Nette\Diagnostics\IBarPanel
{

	public function getPanel()
	{
		return '';
	}

	protected function getCurrentBranchName() {
		$scriptPath = $_SERVER['SCRIPT_FILENAME'];
		
		$dir = realpath(dirname($scriptPath));
		while ($dir !== false && !is_dir($dir . '/.git')) {
			flush();
			$currentDir = $dir;
			$dir .= '/..';
			$dir = realpath($dir);

			// Stop recursion to parent on root directory
			if ($dir == $currentDir) {
				break;
			}
		}

		$head = $dir . '/.git/HEAD';
		if ($dir && is_readable($head)) {
			$branch = file_get_contents($head);
			if (strpos($branch, 'ref:') === 0) {
				$parts = explode('/', $branch);
				return $parts[2];
			}
			return '(' . substr($branch, 0, 7) . '&hellip;)';
		}

		return 'not versioned';
	}

	public function getTab()
	{
		return '<img alt="" src="data:image/png;base64,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" />'
				. $this->getCurrentBranchName();
	}

}

Please update dependency to tracy/tracy ;)