public function changelog($fromRef, $toRef = 'HEAD', $format = self::LOG_FORMAT_CHANGELOG)
    {
        $result = $this->command . ' log ' . $fromRef . '..' . $toRef . ' ' . $format;
        return $result;
    }
public function changelog($fromRef, $toRef = 'HEAD', $format = self::LOG_FORMAT_CHANGELOG)
    {
        $result = $this->command . ' log ' . $fromRef . '..' . $toRef . ' ' . $format;
        return $result;
    }
public function changelog ( $ fromRef , $ toRef = 'HEAD' , $ format = self :: LOG_FORMAT_CHANGELOG ) { $ result = $ this -> command . ' log ' . $ fromRef . '..' . $ toRef . ' ' . $ format ; return $ result ; }
Generate a changelog between two versions

Some possible values for the format parameter:
* --no-merges --format=%B
* --pretty=%s

@param  string $fromRef   From reference
@param  string $toRef     (Optional) To reference, HEAD assumed
@param  string $format    Format
@return string
Generate a changelog between two versions