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<?php |
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namespace League\CLImate\TerminalObject\Dynamic; |
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class Progress extends DynamicTerminalObject |
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{ |
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/** |
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* The total number of items involved |
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* |
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* @var integer $total |
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*/ |
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protected $total = 0; |
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/** |
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* The current item that the progress bar represents |
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* |
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* @var integer $current |
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*/ |
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protected $current = 0; |
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/** |
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* The current percentage displayed |
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* |
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* @var string $current_percentage |
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*/ |
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protected $current_percentage = ''; |
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/** |
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* The string length of the bar when at 100% |
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* |
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* @var integer $bar_str_len |
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*/ |
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protected $bar_str_len; |
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/** |
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* Flag indicating whether we are writing the bar for the first time |
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* |
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* @var boolean $first_line |
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*/ |
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protected $first_line = true; |
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/** |
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* Current status bar label |
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* |
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* @var string $label |
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*/ |
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protected $label; |
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/** |
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* Force a redraw every time |
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* |
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* @var boolean $force_redraw |
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*/ |
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protected $force_redraw = false; |
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/** |
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* If they pass in a total, set the total |
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* |
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* @param integer $total |
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*/ |
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public function __construct($total = null) |
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{ |
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if ($total !== null) { |
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$this->total($total); |
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} |
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} |
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/** |
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* Set the total property |
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* |
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* @param integer $total |
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* |
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* @return Progress |
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*/ |
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public function total($total) |
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{ |
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$this->total = $total; |
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return $this; |
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} |
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/** |
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* Determines the current percentage we are at and re-writes the progress bar |
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* |
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* @param integer $current |
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* @param mixed $label |
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* @throws \Exception |
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*/ |
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public function current($current, $label = null) |
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{ |
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if ($this->total == 0) { |
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// Avoid dividing by 0 |
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throw new \Exception('The progress total must be greater than zero.'); |
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} |
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if ($current > $this->total) { |
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throw new \Exception('The current is greater than the total.'); |
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} |
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$this->drawProgressBar($current, $label); |
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$this->current = $current; |
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$this->label = $label; |
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} |
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/** |
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* Increments the current position we are at and re-writes the progress bar |
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* |
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* @param integer $increment The number of items to increment by |
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* @param string $label |
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*/ |
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public function advance($increment = 1, $label = null) |
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{ |
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$this->current($this->current + $increment, $label); |
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} |
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/** |
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* Force the progress bar to redraw every time regardless of whether it has changed or not |
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* |
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* @param boolean $force |
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* @return Progress |
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*/ |
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public function forceRedraw($force = true) |
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{ |
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$this->force_redraw = !!$force; |
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return $this; |
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} |
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/** |
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* Draw the progress bar, if necessary |
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* |
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* @param string $current |
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* @param string $label |
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*/ |
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protected function drawProgressBar($current, $label) |
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{ |
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$percentage = $this->percentageFormatted($current / $this->total); |
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if ($this->shouldRedraw($percentage, $label)) { |
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$progress_bar = $this->getProgressBar($current, $label); |
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$this->output->write($this->parser->apply($progress_bar)); |
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} |
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$this->current_percentage = $percentage; |
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} |
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/** |
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* Build the progress bar str and return it |
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* |
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* @param integer $current |
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* @param string $label |
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* |
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* @return string |
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*/ |
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protected function getProgressBar($current, $label) |
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{ |
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if ($this->first_line) { |
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// Drop down a line, we are about to |
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// re-write this line for the progress bar |
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$this->output->write(''); |
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$this->first_line = false; |
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} |
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// Move the cursor up one line and clear it to the end |
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$line_count = (strlen($label) > 0) ? 2 : 1; |
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$progress_bar = $this->util->cursor->up($line_count); |
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$progress_bar .= $this->util->cursor->startOfCurrentLine(); |
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$progress_bar .= $this->util->cursor->deleteCurrentLine(); |
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$progress_bar .= $this->getProgressBarStr($current, $label); |
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return $progress_bar; |
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} |
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/** |
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* Get the progress bar string, basically: |
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* =============> 50% label |
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* |
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* @param integer $current |
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* @param string $label |
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* |
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* @return string |
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*/ |
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protected function getProgressBarStr($current, $label) |
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{ |
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$percentage = $current / $this->total; |
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$bar_length = round($this->getBarStrLen() * $percentage); |
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$bar = $this->getBar($bar_length); |
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$number = $this->percentageFormatted($percentage); |
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if ($label) { |
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$label = $this->labelFormatted($label); |
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} |
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return trim("{$bar} {$number}{$label}"); |
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} |
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/** |
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* Get the string for the actual bar based on the current length |
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* |
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* @param integer $length |
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* |
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* @return string |
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*/ |
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protected function getBar($length) |
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{ |
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$bar = str_repeat('=', $length); |
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$padding = str_repeat(' ', $this->getBarStrLen() - $length); |
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return "{$bar}>{$padding}"; |
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} |
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/** |
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* Get the length of the bar string based on the width of the terminal window |
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* |
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* @return integer |
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*/ |
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protected function getBarStrLen() |
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{ |
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if (!$this->bar_str_len) { |
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// Subtract 10 because of the '> 100%' plus some padding, max 100 |
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$this->bar_str_len = min($this->util->width() - 10, 100); |
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} |
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return $this->bar_str_len; |
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} |
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/** |
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* Format the percentage so it looks pretty |
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* |
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* @param integer $percentage |
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* @return float |
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*/ |
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protected function percentageFormatted($percentage) |
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{ |
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return round($percentage * 100) . '%'; |
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} |
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/** |
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* Format the label so it is positioned correctly |
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* |
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* @param string $label |
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* @return string |
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*/ |
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protected function labelFormatted($label) |
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{ |
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return "\n" . $this->util->cursor->startOfCurrentLine() . $this->util->cursor->deleteCurrentLine() . $label; |
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} |
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/** |
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* Determine whether the progress bar has changed and we need to redrew |
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* |
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* @param string $percentage |
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* @param string $label |
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* |
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* @return boolean |
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*/ |
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protected function shouldRedraw($percentage, $label) |
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{ |
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return ($this->force_redraw || $percentage != $this->current_percentage || $label != $this->label); |
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} |
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} |
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