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GNU GENERAL PUBLIC LICENSE
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How to Apply These Terms to Your New Programs
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<https://www.gnu.org/philosophy/why-not-lgpl.html>.

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# An interactive Unicode-aware shell for ReactPHP
## Installing
```shell
$ composer require noccylabs/react-shell:@dev
```
## Features
* Interactive line-editing including arrow keys, home, end, delete and all the commodities you are used to.
* Input is edited on a single scrolling line.
* Mostly Unicode-aware, meaning it will not have a nervous breakdown if you try to enter (single-width LTR) unicode characters.
## Example
```php
$shell = new NoccyLabs\React\Shell\Shell();
// Emitted whenever the prompt is fully redrawn, or redrawPrompt() is manually
// invoked. This is a good place to update a live prompt.
$shell->on('prompt', function () use ($shell) {
$shell->setPrompt(date("H:i:s> "));
});
// Emitted whenever a line is entered. The input is already parsed into tokens
// using str_getcsv, respecting double quotes and escape sequeneces.
$shell->on('input', function (array $input) use ($shell) {
$shell->write("You entered: ".join(" ", $input)."\n");
});
// The shell is an OutputStream, so you can write to it! Doing so will hide the
// prompt, write the output, and then redraw the prompt. This means you don't
// have to care whether the prompt is visible as long as your output is written
// to the shell!
$shell->write("Hello World!\n\n");
// So, this works:
React\EventLoop\Loop::addPeriodicTimer(5, function () use ($shell) {
$shell->write(date(DATE_ATOM)."\n");
});
```

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{
"name": "noccylabs/react-shell",
"description": "A friendy interactive shell library for ReactPH",
"type": "library",
"license": "GPL-3.0-or-later",
"keywords": [ "reactphp", "shell" ],
"autoload": {
"psr-4": {
"NoccyLabs\\React\\Shell\\": "src/"
}
},
"authors": [
{
"name": "NoccyLabs",
"email": "labs@noccy.com"
}
],
"require": {
"react/react": "^1.4"
},
"require-dev": {
"phpunit/phpunit": "^11.0",
"phpstan/phpstan": "^1.10"
}
}

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<?php
use React\EventLoop\Loop;
require_once __DIR__."/vendor/autoload.php";
$shell = new NoccyLabs\React\Shell\Shell();
$shell->on('prompt', function () use ($shell) {
$shell->setPrompt(date("H:i:s> "));
});
$shell->on('input', function (array $input) use ($shell) {
$shell->write("You entered: ".join(" ", $input)."\n");
});
// The shell is an OutputStream
$shell->write("Hello World!\n\n");
Loop::addPeriodicTimer(5, function () use ($shell) {
$shell->write(date(DATE_ATOM)."\n");
});

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parameters:
level: 5
excludePaths:
- doc
- vendor
- tests
# Paths to include in the analysis
paths:
- src

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<?php
namespace NoccyLabs\React\Shell;
use Evenement\EventEmitterInterface;
use Evenement\EventEmitterTrait;
use React\EventLoop\Loop;
use React\Stream\ReadableResourceStream;
use React\Stream\ReadableStreamInterface;
use React\Stream\WritableResourceStream;
use React\Stream\WritableStreamInterface;
class Shell implements WritableStreamInterface, EventEmitterInterface
{
use EventEmitterTrait;
private ReadableStreamInterface $istream;
private WritableStreamInterface $ostream;
private string $oldStty;
private bool $isPrompting = false;
private string $buffer = '';
private int $cursorPos = 0;
private int $termWidth = 0;
private int $scrollOffset = 0;
private string $prompt = '';
private int $promptWidth = 0;
public function __construct(?ReadableStreamInterface $input=null, ?WritableStreamInterface $output=null)
{
$this->istream = $input ?? new ReadableResourceStream(STDIN);
$this->ostream = $output ?? new WritableResourceStream(STDOUT);
$this->istream->on('data', $this->handleInput(...));
Loop::futureTick($this->redrawPrompt(...));
// Save terminal settings and disable inupt buffering
$this->oldStty = exec("stty -g");
exec("stty -icanon min 1 time 0 -echo");
}
public function __destruct()
{
// Restore the terminal to regular buffered mode
exec("stty {$this->oldStty}");
}
public function setPrompt(string $prompt): void
{
$this->prompt = $prompt;
$this->promptWidth = mb_strlen($this->prompt);
}
private function handleInput($v) {
switch ($v) {
case "\x03":
exit(0);
case "\n":
$buffer = str_getcsv($this->buffer, " ");
$this->buffer = '';
$this->cursorPos = 0;
$this->scrollOffset = 0;
$this->emit('input', [ $buffer ]);
break;
case "\x7F": // backspace
if ($this->cursorPos < 1) return;
$this->buffer = mb_substr($this->buffer, 0, $this->cursorPos - 1) .
mb_substr($this->buffer, $this->cursorPos);
$this->cursorPos--;
break;
case "\e[3~": // delete
$this->buffer = mb_substr($this->buffer, 0, $this->cursorPos) .
mb_substr($this->buffer, $this->cursorPos + 1);
break;
case "\e[A": // up
case "\e[B": // down
break;
case "\e[H": // home
case "\e[F": // end
break;
case "\e[D": // left
if ($this->cursorPos < 1) return;
$this->cursorPos--;
break;
case "\e[C": // right
if ($this->cursorPos >= mb_strlen($this->buffer)) return;
$this->cursorPos++;
break;
default:
if (mb_strlen($v) == 1 && ord($v) >= 32) {
$this->buffer = mb_substr($this->buffer, 0, $this->cursorPos) .
$v .
mb_substr($this->buffer, $this->cursorPos);
$this->cursorPos++;
} else {
$this->ostream->write("\e[7m".substr($v,2)."\e[27m");
return;
}
}
$this->updatePrompt();
}
public function write($data)
{
$this->hidePrompt();
$this->ostream->write($data);
$this->redrawPrompt();
return true;
}
public function isWritable()
{
return true;
}
public function end($data = null)
{
// NOP
}
public function close()
{
// NOP
}
public function hidePrompt(): void
{
if (!$this->isPrompting) return;
$this->isPrompting = false;
$this->ostream->write("\r\e[K");
}
public function redrawPrompt(): void
{
$prompt = $this->emit("prompt");
$this->termWidth = intval(exec("tput cols"));
$this->isPrompting = true;
$this->updatePrompt();
}
private function updatePrompt(): void
{
if (!$this->isPrompting) return;
$pos = $this->promptWidth + $this->cursorPos - $this->scrollOffset + 1;
$obuf = "\r" . "\e[1m" . $this->prompt . "\e[22m";
$ostr = mb_substr($this->buffer, $this->scrollOffset) . " ";
$ostr = mb_substr($ostr, 0, $this->termWidth - $this->promptWidth);
$obuf .= $ostr . "\e[K\e[" . $pos . "G";
$this->ostream->write($obuf);
}
}