344 lines
9.6 KiB
PHP
344 lines
9.6 KiB
PHP
<?php
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namespace NoccyLabs\Shell;
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use NoccyLabs\Shell\LineRead;
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class Shell
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{
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const EV_PROMPT = "prompt";
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const EV_COMMAND = "command";
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protected $lineReader = null;
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protected $context = null;
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protected $contextStack = [];
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protected $listeners = [];
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protected $timers = [];
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public function __construct()
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{
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$this->configure();
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}
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protected function configure()
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{
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}
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/**
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* Push a new primary context, saving the previous contexts on a stack.
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*
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* @param Context $context
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*/
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public function pushContext(Context $context)
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{
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if ($this->context) {
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$context->setParent($this->context);
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array_unshift($this->contextStack, $this->context);
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}
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$context->setShell($this);
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$this->context = $context;
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$this->dispatchEvent("context.update", [ "context"=>$this->context ]);
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}
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/**
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* Pop the current context.
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*
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* @return Context
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*/
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public function popContext()
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{
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$previous = $this->context;
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if (count($this->contextStack)>0) {
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$this->context = array_shift($this->contextStack);
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} else {
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$this->context = null;
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}
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$this->dispatchEvent("context.update", [ "context"=>$this->context ]);
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return $previous;
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}
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public function getContextPath($separator=":")
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{
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// Return null if we don't have a current context
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if (!$this->context)
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return null;
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// Assemble the contexts to walk
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$stack = [ $this->context->getName() ];
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foreach ($this->contextStack as $context) {
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$stack[] = $context->getName();
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}
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// Reverse the order to make it more logical
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$stack = array_reverse($stack);
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return join($separator,$stack);
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}
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public function createContext()
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{
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$context = new Context();
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$this->pushContext($context);
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return $context;
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}
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/**
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* Add a handler to be called when an event fires.
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*
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* @param string $event
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* @param callable $handler
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*/
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public function addListener($event, callable $handler)
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{
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if (!array_key_exists($event,$this->listeners)) {
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$this->listeners[$event] = [];
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}
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$this->listeners[$event][] = $handler;
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}
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/**
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* Invoke event handlers for event.
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*
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* @param string $event
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* @param callable $handler
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*/
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protected function dispatchEvent($event, array $data=[])
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{
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if (!array_key_exists($event,$this->listeners)) {
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return;
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}
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foreach ($this->listeners[$event] as $handler) {
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call_user_func($handler, (object)$data, $this);
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}
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}
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/**
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* Add a callback to be called at a regular interval during the update phase.
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* Adding timers with a low interval (less than 200 i.e. 0.2s) may have an
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* impact on performance.
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*
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* @param int $interval Interval in ms
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* @param callable $handler The handler
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* @param array $userdata Data to be passed to the handler
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* @return Timer
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*/
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public function addTimer($interval, callable $handler, array $userdata=[])
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{
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$timer = new class($interval, $handler, $userdata) {
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private $next;
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private $interval;
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private $handler;
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private $userdata;
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public function __construct($interval, callable $handler, array $userdata) {
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$this->interval = $interval / 1000;
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$this->handler = $handler;
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$this->userdata = $userdata;
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}
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public function update() {
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$now = microtime(true);
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if ($now > $this->next) {
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$this->next = $now + $this->interval;
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call_user_func($this->handler, $this->userdata);
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}
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}
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};
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$this->timers[] = $timer;
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return $timer;
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}
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/**
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* Remove a created timer.
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*
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* @param Timer $timer
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*/
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public function removeTimer(Timer $timer)
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{
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}
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public function setPrompt($text)
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{
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if (!$this->lineReader) {
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return;
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}
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$this->lineReader->setPromptText($text);
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}
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/**
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* Find a command and return a closure.
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*
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* @return callable The command
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*/
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private function findCommand($command)
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{
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// Go over current context and walk through stack until finding command
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foreach(array_merge([ $this->context ] , $this->contextStack) as $context) {
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if ($context->hasCommand($command)) {
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$handler = $context->getCommand($command);
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break;
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}
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}
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if (empty($handler)) {
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return false;
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}
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// Return closure
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return function (...$args) use ($handler) {
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return call_user_func($handler, ...$args);
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};
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}
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/**
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* Execute a command with arguments.
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*
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* @param string $command The command name to execute
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* @param string $args Arguments
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* @return mixed
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* @throws Exception\BadCommandExcception
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*/
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public function executeCommand($command, ...$args)
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{
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if ($this->executeBuiltin($command, ...$args)) {
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return;
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}
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// Call the handler if the command was found
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if (($target = $this->findCommand($command))) {
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$ret = $target(...$args);
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if ($ret instanceof Context) {
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$this->pushContext($ret);
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}
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return;
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}
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// Throw error if the command could not be found
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throw new Exception\BadCommandException("Command {$command} not found");
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}
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public function executeBuiltin($command, ...$args)
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{
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switch ($command) {
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case '.':
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$type = basename(strtr(get_class($this->context), "\\", "/"));
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printf("%s<%s>: %s\n", $type, $this->context->getName(), json_encode($this->context->getData()));
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$level = 0;
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foreach ($this->contextStack as $context) {
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$type = basename(strtr(get_class($context), "\\", "/"));
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printf(" %s- %s<%s>\n", str_repeat(" ",$level++), $type, $context->getName());
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}
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break;
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case '..':
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if (count($this->contextStack)>0)
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$this->popContext();
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break;
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case 'help':
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$help = $this->context->getCommandHelp();
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printf("Commands in current context:\n\n");
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foreach ($help as $command=>$info) {
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printf(" %-20s %s\n", $command, $info);
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}
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printf("\nGlobal commands:\n\n");
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printf(" %-20s %s\n", "exit", "Leave the shell");
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printf(" %-20s %s\n", "..", "Discard the current context and go to parent");
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break;
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case 'exit':
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$this->stop();
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break;
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default:
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return false;
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}
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return true;
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}
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/**
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* Parse a string and execute the resulting command.
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*
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* @param string $command The string to parse
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* @return mixed
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*/
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public function executeBuffer(string $command)
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{
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$args = str_getcsv($command, " ", "\"", "\\");
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$command = array_shift($args);
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try {
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$this->executeCommand($command, ...$args);
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} catch (Exception\ShellException $e) {
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echo "\e[31;91;1m{$e->getMessage()}\e[0m\n";
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}
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/*
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if (array_key_exists($commandName, $this->commands)) {
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$command = $this->commands[$commandName];
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if ($command instanceof Command) {
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$command->run($buffer);
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} else {
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call_user_func_array($command,$buffer);
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}
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return;
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}
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$this->writeln("Bad command: ".$commandName);
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*/
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}
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public function run()
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{
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$this->lineReader = new LineRead();
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$this->lineReader->setPromptText("shell>");
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$this->lineReader->setPromptStyle(new Style(Style::BR_GREEN));
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$this->lineReader->setCommandStyle(new Style(Style::GREEN));
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$this->running = true;
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$this->dispatchEvent("prompt", [ "context"=>$this->context ]);
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while ($this->running) {
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// Update the input stuff, sleep if nothing to do.
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if (!($buffer = $this->lineReader->update())) {
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usleep(10000);
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}
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// we get a ^C on ^C, so deal with the ^C.
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if ($buffer == "\x03") {
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$this->stop();
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continue;
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}
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// Execute the buffer
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ob_start();
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$this->dispatchEvent("update");
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foreach ($this->timers as $timer) {
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$timer->update();
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}
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if ($buffer) {
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$this->executeBuffer($buffer);
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}
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$output = ob_get_contents();
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ob_end_clean();
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if (trim($output)) {
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$this->lineReader->erase();
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echo rtrim($output)."\n";
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$this->lineReader->redraw();
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}
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if (!$this->context) {
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$this->stop();
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}
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if ($buffer) {
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$this->dispatchEvent("prompt", [ "context"=>$this->context ]);
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}
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}
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$this->lineReader = null;
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}
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public function stop()
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{
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$this->running = false;
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}
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}
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