GitInfo.php

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<?php
class GitInfo {

        protected static $repo = null;

        protected $basedir;

        private static $viewers = false;

        public function __construct( $dir ) {
                $this->basedir = "{$dir}/.git/";
        }

        public static function repo() {
                global $IP;
                if ( is_null( self::$repo ) ) {
                        self::$repo = new self( $IP );
                }
                return self::$repo;
        }

        public static function isSHA1( $str ) {
                return !!preg_match( '/^[0-9A-F]{40}$/i', $str );
        }

        public function getHead() {
                $HEADfile = "{$this->basedir}/HEAD";

                if ( !is_readable( $HEADfile ) ) {
                        return false;
                }

                $HEAD = file_get_contents( $HEADfile );

                if ( preg_match( "/ref: (.*)/", $HEAD, $m ) ) {
                        return rtrim( $m[1] );
                } else {
                        return rtrim( $HEAD );
                }
        }

        public function getHeadSHA1() {
                $HEAD = $this->getHead();

                // If detached HEAD may be a SHA1
                if ( self::isSHA1( $HEAD ) ) {
                        return $HEAD;
                }

                // If not a SHA1 it may be a ref:
                $REFfile = "{$this->basedir}{$HEAD}";
                if ( !is_readable( $REFfile ) ) {
                        return false;
                }

                $sha1 = rtrim( file_get_contents( $REFfile ) );

                return $sha1;
        }

        public function getCurrentBranch() {
                $HEAD = $this->getHead();
                if ( $HEAD && preg_match( "#^refs/heads/(.*)$#", $HEAD, $m ) ) {
                        return $m[1];
                } else {
                        return $HEAD;
                }
        }

        public function getHeadViewUrl() {
                $config = "{$this->basedir}/config";
                if ( !is_readable( $config ) ) {
                        return false;
                }

                $configArray = parse_ini_file( $config, true );
                $remote = false;

                // Use the "origin" remote repo if available or any other repo if not.
                if ( isset( $configArray['remote origin'] ) ) {
                        $remote = $configArray['remote origin'];
                } else {
                        foreach( $configArray as $sectionName => $sectionConf ) {
                                if ( substr( $sectionName, 0, 6 ) == 'remote' ) {
                                        $remote = $sectionConf;
                                }
                        }
                }

                if ( $remote === false || !isset( $remote['url'] ) ) {
                        return false;
                }

                $url = $remote['url'];
                if ( substr( $url, -4 ) !== '.git' ) {
                        $url .= '.git';
                }
                foreach( self::getViewers() as $repo => $viewer ) {
                        $pattern = '#^' . $repo . '$#';
                        if ( preg_match( $pattern, $url ) ) {
                                $viewerUrl = preg_replace( $pattern, $viewer, $url );
                                $headSHA1 = $this->getHeadSHA1();
                                $replacements = array(
                                        '%h' => substr( $headSHA1, 0, 7 ),
                                        '%H' => $headSHA1
                                );
                                return strtr( $viewerUrl, $replacements );
                        }
                }
                return false;
        }

        public static function headSHA1() {
                return self::repo()->getHeadSHA1();
        }

        public static function currentBranch() {
                return self::repo()->getCurrentBranch();
        }

        public static function headViewUrl() {
                return self::repo()->getHeadViewUrl();
        }

        protected static function getViewers() {
                global $wgGitRepositoryViewers;

                if( self::$viewers === false ) {
                        self::$viewers = $wgGitRepositoryViewers;
                        wfRunHooks( 'GitViewers', array( &self::$viewers ) );
                }

                return self::$viewers;
        }
}