Added exception handling to run()

README.md

@@ -0,0 +1,12 @@
+NoccyLabs Shell Core
+====================
+
+This library helps make elegant command line applications that spawn an isolated shell.
+It uses a standalone implementation for buffered input with support for arrow keys to
+navigate the history and more.
+
+Note that this library requirements a fully ANSI compatible terminal with UTF-8 support
+in order to use colors, control the cursor position etc. As it uses `stty` to configure
+input buffering, it will likely not work on Windows.
+
+

examples/basic.php

@@ -0,0 +1,12 @@
+<?php
+
+require_once __DIR__."/../vendor/autoload.php";
+
+use NoccyLabs\Shell\Shell;
+use NoccyLabs\Shell\Context;
+
+
+$myShell = new Shell();
+$myShell->setPrompt("test>");
+$myShell->pushContext(new Context());
+$myShell->run();

examples/catchall.php

@@ -0,0 +1,20 @@
+<?php
+
+require_once __DIR__."/../vendor/autoload.php";
+
+use NoccyLabs\Shell\Shell;
+use NoccyLabs\Shell\Context;
+
+class CatchAllContext extends Context
+{
+    public function execute($cmd, ...$arg)
+    {
+        printf("Executing: %s %s\n", $cmd, join(" ",$arg));
+        return true;
+    }
+}
+
+$myShell = new Shell();
+$myShell->setPrompt("test>");
+$myShell->pushContext(new CatchAllContext());
+$myShell->run();

lib/Context.php

@@ -23,6 +23,11 @@ class Context
         $this->configure();
     }
 
+    public function getContextInfo()
+    {
+        return null;
+    }
+
     public function setShell(Shell $shell)
     {
         $this->shell = $shell;
@@ -141,6 +146,23 @@ class Context
         return array_key_exists('global', $info);
     }
 
+    /**
+     * Catch-all handler for commands not defined in context, globally or builtin.
+     * Override this function and return true if the command is handled ok.
+     *
+     * @param string $command The command to execute
+     * @param string[] $args The arguments to the command
+     * @return bool True if the command was handled
+     */
+    public function execute($command, ...$args)
+    {
+        return false;
+    }
+
+    /**
+     * Get the name of the context
+     *
+     */
     public function getName()
     {
         return $this->name;

lib/LineRead.php

@@ -161,22 +161,33 @@ class LineRead
                 if ($this->posHistory == 0) {
                     $this->stashedBuffer = $this->buffer;
                 }
+                if ($this->posCursor == strlen($this->buffer)) {
+                    $this->posCursor = -1;
+                }
                 if ($this->posHistory < count($this->history)) {
                     $this->posHistory++;
                     $this->buffer = $this->history[$this->posHistory-1];
-                    $this->redraw();
                 }
+                if ($this->posCursor == -1) {
+                    $this->posCursor = strlen($this->buffer);
+                }
+                $this->redraw();
                 break;
             case "\e[B": // down
+                if ($this->posCursor == strlen($this->buffer)) {
+                    $this->posCursor = -1;
+                }
                 if ($this->posHistory > 1) {
                     $this->posHistory--;
                     $this->buffer = $this->history[$this->posHistory-1];
-                    $this->redraw();
                 } elseif ($this->posHistory > 0) {
                     $this->posHistory--;
                     $this->buffer = $this->stashedBuffer;
-                    $this->redraw();
                 }
+                if ($this->posCursor == -1) {
+                    $this->posCursor = strlen($this->buffer);
+                }
+                $this->redraw();
                 break;
             default:
                 fprintf(STDERR, "\n%s\n", substr($code,1));

lib/Shell.php

@@ -223,6 +223,12 @@ class Shell
             }
             return;
         }
+
+        // Call 'execute' on the current context
+        if ($this->context->execute($command, ...$args)) {
+            return;
+        }
+
         // Throw error if the command could not be found
         throw new Exception\BadCommandException("Command {$command} not found");
     }
@@ -232,11 +238,11 @@ class Shell
         switch ($command) {
             case '.':
                 $type = basename(strtr(get_class($this->context), "\\", "/"));
-                printf("%s<%s>: %s\n", $type, $this->context->getName(), json_encode($this->context->getData()));
+                printf("%s<%s>: %s\n", $type, $this->context->getName(), $this->context->getContextInfo());
                 $level = 0;
                 foreach ($this->contextStack as $context) {
                     $type = basename(strtr(get_class($context), "\\", "/"));
-                    printf(" %s- %s<%s>\n", str_repeat("  ",$level++), $type, $context->getName());
+                    printf(" %s└─%s<%s>: %s\n", str_repeat("  ",$level++), $type, $context->getName(), $context->getContextInfo());
                 }
                 break;
             case '..':
@@ -315,6 +321,7 @@ class Shell
 
     public function run()
     {
+        try {
             $this->lineReader = new LineRead();
 
             $this->lineReader->setPromptText($this->prompt);
@@ -368,6 +375,10 @@ class Shell
                 }
             }
 
+        } catch (\Exception $e) {
+            fprintf(STDERR, "\e[31;1mFatal: Unhandled exception\e[0m\n\n%s\n", $e);
+        }
+
         $this->lineReader = null;
 
     }