<?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\Formatter\CodeFormatter;
use Psy\Output\ShellOutput;
use Psy\Shell;
use Symfony\Component\Console\Input\InputInterface;
use Symfony\Component\Console\Input\InputOption;
use Symfony\Component\Console\Output\OutputInterface;

/**
 * Show the context of where you opened the debugger.
 */
class WhereamiCommand extends Command
{
    private $backtrace;

    public function __construct()
    {
        $this->backtrace = \debug_backtrace(\DEBUG_BACKTRACE_IGNORE_ARGS);

        parent::__construct();
    }

    /**
     * {@inheritdoc}
     */
    protected function configure()
    {
        $this
            ->setName('whereami')
            ->setDefinition([
                new InputOption('num', 'n', InputOption::VALUE_OPTIONAL, 'Number of lines before and after.', '5'),
                new InputOption('file', 'f|a', InputOption::VALUE_NONE, 'Show the full source for the current file.'),
            ])
            ->setDescription('Show where you are in the code.')
            ->setHelp(
                <<<'HELP'
Show where you are in the code.

Optionally, include the number of lines before and after you want to display,
or --file for the whole file.

e.g.
<return>> whereami </return>
<return>> whereami -n10</return>
<return>> whereami --file</return>
HELP
            );
    }

    /**
     * Obtains the correct stack frame in the full backtrace.
     *
     * @return array
     */
    protected function trace(): array
    {
        foreach (\array_reverse($this->backtrace) as $stackFrame) {
            if ($this->isDebugCall($stackFrame)) {
                return $stackFrame;
            }
        }

        return \end($this->backtrace);
    }

    private static function isDebugCall(array $stackFrame): bool
    {
        $class = isset($stackFrame['class']) ? $stackFrame['class'] : null;
        $function = isset($stackFrame['function']) ? $stackFrame['function'] : null;

        return ($class === null && $function === 'Psy\\debug') ||
            ($class === Shell::class && \in_array($function, ['__construct', 'debug']));
    }

    /**
     * Determine the file and line based on the specific backtrace.
     *
     * @return array
     */
    protected function fileInfo(): array
    {
        $stackFrame = $this->trace();
        if (\preg_match('/eval\(/', $stackFrame['file'])) {
            \preg_match_all('/([^\(]+)\((\d+)/', $stackFrame['file'], $matches);
            $file = $matches[1][0];
            $line = (int) $matches[2][0];
        } else {
            $file = $stackFrame['file'];
            $line = $stackFrame['line'];
        }

        return \compact('file', 'line');
    }

    /**
     * {@inheritdoc}
     *
     * @return int 0 if everything went fine, or an exit code
     */
    protected function execute(InputInterface $input, OutputInterface $output): int
    {
        $info = $this->fileInfo();
        $num = $input->getOption('num');
        $lineNum = $info['line'];
        $startLine = \max($lineNum - $num, 1);
        $endLine = $lineNum + $num;
        $code = \file_get_contents($info['file']);

        if ($input->getOption('file')) {
            $startLine = 1;
            $endLine = null;
        }

        if ($output instanceof ShellOutput) {
            $output->startPaging();
        }

        $output->writeln(\sprintf('From <info>%s:%s</info>:', $this->replaceCwd($info['file']), $lineNum));
        $output->write(CodeFormatter::formatCode($code, $startLine, $endLine, $lineNum), false);

        if ($output instanceof ShellOutput) {
            $output->stopPaging();
        }

        return 0;
    }

    /**
     * Replace the given directory from the start of a filepath.
     *
     * @param string $file
     */
    private function replaceCwd(string $file): string
    {
        $cwd = \getcwd();
        if ($cwd === false) {
            return $file;
        }

        $cwd = \rtrim($cwd, \DIRECTORY_SEPARATOR).\DIRECTORY_SEPARATOR;

        return \preg_replace('/^'.\preg_quote($cwd, '/').'/', '', $file);
    }
}

.NET Framework

Project Request

ProjectC

Vehicle Maintenance

Movie Navigator

Customers Exchange

ATM

.NET Core

Mail Daemon

Custom

Buns of code

PHP

Mediabox

Loan Castle

Content Management

Laravel

Phone Check

Frontend

Forex Wall

Business projects

Certification Center

Amerikas Auto

Pet projects

Geolocation Assistant

Web Dynamics

Blackball

Good old times

DOS Clock

BrainOut

Airport Administrator

Atomizer

Mediabox