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.
+
+

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

@@ -321,6 +321,7 @@ class Shell
 
     public function run()
     {
+        try {
             $this->lineReader = new LineRead();
 
             $this->lineReader->setPromptText($this->prompt);
@@ -374,6 +375,10 @@ class Shell
                 }
             }
 
+        } catch (\Exception $e) {
+            fprintf(STDERR, "\e[31;1mFatal: Unhandled exception\e[0m\n\n%s\n", $e);
+        }
+
         $this->lineReader = null;
 
     }