Improved context commands

lib/Shell.php

@@ -210,11 +210,14 @@ class Shell
                     $this->popContext();
                 break;
             case 'help':
-                echo
-                    "Built in commands:\n".
-                    "  .        Show current context\n".
-                    "  ..       Go to parent context\n".
-                    "  exit     Exit the shell\n";
+                $help = $this->context->getCommandHelp();
+                printf("Commands in current context:\n\n");
+                foreach ($help as $command=>$info) {
+                    printf("  %-20s %s\n", $command, $info);
+                }
+                printf("\nGlobal commands:\n\n");
+                printf("  %-20s %s\n", "exit", "Leave the shell");
+                printf("  %-20s %s\n", "..", "Discard the current context and go to parent");
                 break;
             case 'exit':
                 $this->stop();