Misc fixes

* Updated build scripts to handle gitless environments a little
  better
* PDO shell plugin improvements
* More tests

src/Environment/ScriptRunner.php

@@ -10,6 +10,13 @@ class ScriptRunner
 
     private ?string $directory = null;
 
+    private bool $quiet;
+
+    public function __construct(bool $quiet=false)
+    {
+        $this->quiet = $quiet;
+    }
+
     public function setDirectory(?string $directory)
     {
         $this->directory = $directory;
@@ -22,6 +29,10 @@ class ScriptRunner
 
     public function evaluateDefinedScript(string $name)
     {
+        if (!array_key_exists($name, $this->scripts)) {
+            printf("error: The script {$name} is not defined\n");
+            exit(1);
+        }
         $script = $this->scripts[$name];
         $this->evaluate($script);
     }
@@ -44,10 +55,12 @@ class ScriptRunner
             $subscript = $this->scripts[$subname];
             $this->evaluate($subscript);
         } else {
-            if (posix_isatty(STDOUT)) {
-                printf("\e[0;33m> \e[0;93m%s\e[0m\n", $script);
-            } else {
-                printf("> %s\n", $script);
+            if (!$this->quiet) {
+                if (posix_isatty(STDOUT)) {
+                    printf("\e[0;33m> \e[0;93m%s\e[0m\n", $script);
+                } else {
+                    printf("> %s\n", $script);
+                }
             }
     
             if (str_contains($script, ' ')) {