Added user input support and many fixes. (0.16.5)

lib/io/console.fun

@@ -0,0 +1,31 @@
+/*
+ * Console utilities: prompt, ask, and yes/no helpers built on input().
+ */
+
+#include <strings.fun>
+
+class Console()
+  // Print a prompt and read a line (no trailing newline)
+  fun prompt(this, text)
+    return input(to_string(text))
+
+  // Ask a question with ": " suffix; returns the user's response string
+  fun ask(this, question)
+    q = to_string(question)
+    if (len(q) == 0)
+      return input("")
+    else
+      return input(join([q, ": "], ""))
+
+  // Ask a yes/no question; returns 1 for yes, 0 for no
+  // Accepts: y, yes, n, no (case-insensitive). Keeps asking until valid.
+  fun ask_yes_no(this, question)
+    q = to_string(question)
+    while true
+      ans = input(join([q, " [y/n]: "], ""))
+      a = str_to_lower(ans)
+      if (a == "y" || a == "yes")
+        return 1
+      else if (a == "n" || a == "no")
+        return 0
+      // otherwise loop again