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HistoryCommand.php
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HistoryCommand.php
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<?php
/*
* This file is part of Psy Shell.
*
* (c) 2012-2023 Justin Hileman
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
namespace Psy\Command;
use Psy\Input\FilterOptions;
use Psy\Output\ShellOutput;
use Psy\Readline\Readline;
use Symfony\Component\Console\Formatter\OutputFormatter;
use Symfony\Component\Console\Input\InputInterface;
use Symfony\Component\Console\Input\InputOption;
use Symfony\Component\Console\Output\OutputInterface;
/**
* Psy Shell history command.
*
* Shows, searches and replays readline history. Not too shabby.
*/
class HistoryCommand extends Command
{
private FilterOptions $filter;
private Readline $readline;
/**
* {@inheritdoc}
*/
public function __construct($name = null)
{
$this->filter = new FilterOptions();
parent::__construct($name);
}
/**
* Set the Shell's Readline service.
*
* @param Readline $readline
*/
public function setReadline(Readline $readline)
{
$this->readline = $readline;
}
/**
* {@inheritdoc}
*/
protected function configure()
{
list($grep, $insensitive, $invert) = FilterOptions::getOptions();
$this
->setName('history')
->setAliases(['hist'])
->setDefinition([
new InputOption('show', 's', InputOption::VALUE_REQUIRED, 'Show the given range of lines.'),
new InputOption('head', 'H', InputOption::VALUE_REQUIRED, 'Display the first N items.'),
new InputOption('tail', 'T', InputOption::VALUE_REQUIRED, 'Display the last N items.'),
$grep,
$insensitive,
$invert,
new InputOption('no-numbers', 'N', InputOption::VALUE_NONE, 'Omit line numbers.'),
new InputOption('save', '', InputOption::VALUE_REQUIRED, 'Save history to a file.'),
new InputOption('replay', '', InputOption::VALUE_NONE, 'Replay.'),
new InputOption('clear', '', InputOption::VALUE_NONE, 'Clear the history.'),
])
->setDescription('Show the Psy Shell history.')
->setHelp(
<<<'HELP'
Show, search, save or replay the Psy Shell history.
e.g.
<return>>>> history --grep /[bB]acon/</return>
<return>>>> history --show 0..10 --replay</return>
<return>>>> history --clear</return>
<return>>>> history --tail 1000 --save somefile.txt</return>
HELP
);
}
/**
* {@inheritdoc}
*
* @return int 0 if everything went fine, or an exit code
*/
protected function execute(InputInterface $input, OutputInterface $output): int
{
$this->validateOnlyOne($input, ['show', 'head', 'tail']);
$this->validateOnlyOne($input, ['save', 'replay', 'clear']);
$history = $this->getHistorySlice(
$input->getOption('show'),
$input->getOption('head'),
$input->getOption('tail')
);
$highlighted = false;
$this->filter->bind($input);
if ($this->filter->hasFilter()) {
$matches = [];
$highlighted = [];
foreach ($history as $i => $line) {
if ($this->filter->match($line, $matches)) {
if (isset($matches[0])) {
$chunks = \explode($matches[0], $history[$i]);
$chunks = \array_map([__CLASS__, 'escape'], $chunks);
$glue = \sprintf('<urgent>%s</urgent>', self::escape($matches[0]));
$highlighted[$i] = \implode($glue, $chunks);
}
} else {
unset($history[$i]);
}
}
}
if ($save = $input->getOption('save')) {
$output->writeln(\sprintf('Saving history in %s...', $save));
\file_put_contents($save, \implode(\PHP_EOL, $history).\PHP_EOL);
$output->writeln('<info>History saved.</info>');
} elseif ($input->getOption('replay')) {
if (!($input->getOption('show') || $input->getOption('head') || $input->getOption('tail'))) {
throw new \InvalidArgumentException('You must limit history via --head, --tail or --show before replaying');
}
$count = \count($history);
$output->writeln(\sprintf('Replaying %d line%s of history', $count, ($count !== 1) ? 's' : ''));
$this->getShell()->addInput($history);
} elseif ($input->getOption('clear')) {
$this->clearHistory();
$output->writeln('<info>History cleared.</info>');
} else {
$type = $input->getOption('no-numbers') ? 0 : ShellOutput::NUMBER_LINES;
if (!$highlighted) {
$type = $type | OutputInterface::OUTPUT_RAW;
}
$output->page($highlighted ?: $history, $type);
}
return 0;
}
/**
* Extract a range from a string.
*
* @param string $range
*
* @return int[] [ start, end ]
*/
private function extractRange(string $range): array
{
if (\preg_match('/^\d+$/', $range)) {
return [(int) $range, (int) $range + 1];
}
$matches = [];
if ($range !== '..' && \preg_match('/^(\d*)\.\.(\d*)$/', $range, $matches)) {
$start = $matches[1] ? (int) $matches[1] : 0;
$end = $matches[2] ? (int) $matches[2] + 1 : \PHP_INT_MAX;
return [$start, $end];
}
throw new \InvalidArgumentException('Unexpected range: '.$range);
}
/**
* Retrieve a slice of the readline history.
*
* @param string|null $show
* @param string|null $head
* @param string|null $tail
*
* @return array A slice of history
*/
private function getHistorySlice($show, $head, $tail): array
{
$history = $this->readline->listHistory();
// don't show the current `history` invocation
\array_pop($history);
if ($show) {
list($start, $end) = $this->extractRange($show);
$length = $end - $start;
} elseif ($head) {
if (!\preg_match('/^\d+$/', $head)) {
throw new \InvalidArgumentException('Please specify an integer argument for --head');
}
$start = 0;
$length = (int) $head;
} elseif ($tail) {
if (!\preg_match('/^\d+$/', $tail)) {
throw new \InvalidArgumentException('Please specify an integer argument for --tail');
}
$start = \count($history) - (int) $tail;
$length = (int) $tail + 1;
} else {
return $history;
}
return \array_slice($history, $start, $length, true);
}
/**
* Validate that only one of the given $options is set.
*
* @param InputInterface $input
* @param array $options
*/
private function validateOnlyOne(InputInterface $input, array $options)
{
$count = 0;
foreach ($options as $opt) {
if ($input->getOption($opt)) {
$count++;
}
}
if ($count > 1) {
throw new \InvalidArgumentException('Please specify only one of --'.\implode(', --', $options));
}
}
/**
* Clear the readline history.
*/
private function clearHistory()
{
$this->readline->clearHistory();
}
public static function escape(string $string): string
{
return OutputFormatter::escape($string);
}
}

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