#!/usr/bin/env php
<?php
// disable E_STRICT
if (defined('E_STRICT')) {
    ini_set('error_reporting', ini_get('error_reporting')&~E_STRICT);
}

require_once 'Console/Getopt.php';


class PHSH
{
    var $options = array();

    function phsh()
    {
        $this->initialize();
    }

    function initialize()
    {
        $this->options = array(
            'help'         => false,
            'history_file' => "{$_ENV['HOME']}/.phsh_history",
            'login'        => false,
            'login_file'   => "{$_ENV['HOME']}/.phsh_login",
            'rc_file'      => "{$_ENV['HOME']}/.phshrc");
    }

    function &addHistory(&$line)
    {
        static $last_line = '';

        if ($line != $last_line) {
            readline_add_history($line);
            readline_write_history($this->options['history_file']);
            $last_line = $line;
        }

        return $line;
    }

    function executeShell($command_line = null)
    {
        $pid = pcntl_fork();
        if ($pid == 0) {
            $path = '/bin/sh';
            $args = array();
            if ($command_line) {
                $args = array('-c', $command_line);
            }
            exit(pcntl_exec($path, $args));
        }
        return pcntl_waitpid($pid, $status);
    }

    function getProgramName()
    {
        $argv = Console_Getopt::readPHPArgv();
        return basename($argv[0]);
    }

    function isCallable(&$line)
    {
        $regex = '/^[a-zA-Z_\x7f-\xff][a-zA-Z0-9_\x7f-\xff]*/';
        return preg_match($regex, $line, $matches) && !is_callable($matches[0]);
    }

    function main()
    {
        if (PEAR::isError($this->parseOptions())) {
            fwrite(STDERR, "Invalid options\n");
            $this->usage(1);
        }

        if ($this->options['help']) {
            $this->usage();
        }

        readline_completion_function('__phshCompletion');

        return $this->mainLoop();
    }

    function mainLoop()
    {
        if ($this->options['login'] && file_exists($this->options['login_file'])) {
            include($this->options['login_file']);
        }

        if (file_exists($this->options['rc_file'])) {
            include($this->options['rc_file']);
        }

        readline_read_history($this->options['history_file']);
        $__phsh = array();
        @ob_flush();

        while (true) {
            $__phsh['line'] = $this->modifyCommandLine($this->addHistory(
                readline('<?php ')));
            if ($__phsh['line']) {
                $this->printResult(eval($__phsh['line']));
            }
            @ob_flush();
        }
    }

    function &modifyCommandLine(&$line)
    {
        $new_line = trim($line);
        if (!$new_line) {
            return $new_line;
        }

        if ($new_line[0] == '#') {
            $this->executeShell(trim(substr($new_line, 1)));
            $new_line = '';
        } else if (substr($new_line, -2) == '?>') {
            $new_line = 'exit;';
        } else if ($this->isCallable($new_line)) {
            $new_line = "{$new_line}; return;";
        } else {
            $new_line = "return {$new_line};";
        }

        return $new_line;
    }

    function &parseOptions()
    {
        $console_getopt = new Console_Getopt;
        $longoptions = array('help', 'login');
        $options = array();
        $shortoptions = 'hl';

        $result = $console_getopt->getopt(
            $console_getopt->readPHPArgv(), $shortoptions, $longoptions);
        if (PEAR::isError($result)) {
            return $result;
        }

        $program_name = $this->getProgramName();
        if ($program_name[0] == '-') {
            $options['login'] = true;
        }

        foreach ($result[0] as $option) {
            switch ($option[0]) {
            case 'h':
            case '--help':
                $options['help'] = true;
                break;
            case 'l':
            case '--login':
                $options['login'] = true;
                break;
            }
        }

        $this->options = array_merge($this->options, $options);
        return $this->options;
    }

    function printResult($result)
    {
        var_dump($result);
        return true;
    }

    function usage($status = 0)
    {
        $program_name = $this->getProgramName();
        $message = <<< EOS
Usage: {$program_name} [options]
    -h, --help         show this message
    -l, --login        works as a login shell
EOS;
        fwrite(STDERR, $message."\n");
        exit($status);
    }

    /******************
     *                *
     * static methods *
     *                *
     ******************/
    function completion($line, $pos, $cursor)
    {
        $functions = get_defined_functions();
        return array_merge(
            $functions['internal'], $functions['user'],
            array_keys(get_defined_constants()));
    }
}

function __phshCompletion($line, $position, $cursor)
{
    return PHSH::completion($line, $position, $cursor);
}

// immediately return while required as a library
if (debug_backtrace()) {
    return;
}

$phsh = new PHSH;
return $phsh->main();