+++ /dev/null
-<?php
-
-/*
- * This file is part of Psy Shell.
- *
- * (c) 2012-2017 Justin Hileman
- *
- * For the full copyright and license information, please view the LICENSE
- * file that was distributed with this source code.
- */
-
-namespace Psy\Output;
-
-use Symfony\Component\Console\Output\StreamOutput;
-
-/**
- * ProcOutputPager class.
- *
- * A ProcOutputPager instance wraps a regular StreamOutput's stream. Rather
- * than writing directly to the stream, it shells out to a pager process and
- * gives that process the stream as stdout. This means regular *nix commands
- * like `less` and `more` can be used to page large amounts of output.
- */
-class ProcOutputPager extends StreamOutput implements OutputPager
-{
- private $proc;
- private $pipe;
- private $stream;
- private $cmd;
-
- /**
- * Constructor.
- *
- * @param StreamOutput $output
- * @param string $cmd Pager process command (default: 'less -R -S -F -X')
- */
- public function __construct(StreamOutput $output, $cmd = 'less -R -S -F -X')
- {
- $this->stream = $output->getStream();
- $this->cmd = $cmd;
- }
-
- /**
- * Writes a message to the output.
- *
- * @param string $message A message to write to the output
- * @param bool $newline Whether to add a newline or not
- *
- * @throws \RuntimeException When unable to write output (should never happen)
- */
- public function doWrite($message, $newline)
- {
- $pipe = $this->getPipe();
- if (false === @fwrite($pipe, $message . ($newline ? PHP_EOL : ''))) {
- // @codeCoverageIgnoreStart
- // should never happen
- throw new \RuntimeException('Unable to write output.');
- // @codeCoverageIgnoreEnd
- }
-
- fflush($pipe);
- }
-
- /**
- * Close the current pager process.
- */
- public function close()
- {
- if (isset($this->pipe)) {
- fclose($this->pipe);
- }
-
- if (isset($this->proc)) {
- $exit = proc_close($this->proc);
- if ($exit !== 0) {
- throw new \RuntimeException('Error closing output stream');
- }
- }
-
- unset($this->pipe, $this->proc);
- }
-
- /**
- * Get a pipe for paging output.
- *
- * If no active pager process exists, fork one and return its input pipe.
- */
- private function getPipe()
- {
- if (!isset($this->pipe) || !isset($this->proc)) {
- $desc = array(array('pipe', 'r'), $this->stream, fopen('php://stderr', 'w'));
- $this->proc = proc_open($this->cmd, $desc, $pipes);
-
- if (!is_resource($this->proc)) {
- throw new \RuntimeException('Error opening output stream');
- }
-
- $this->pipe = $pipes[0];
- }
-
- return $this->pipe;
- }
-}