From a0968e3bb2504127e26ab48b32dc6550c6cadd71 Mon Sep 17 00:00:00 2001
From: mryouse
Date: Sat, 18 Jun 2022 16:22:57 +0000
Subject: implement user-symbols

---
 neb/interpreter.py | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/neb/interpreter.py b/neb/interpreter.py
index 2461f90..4762ae9 100644
--- a/neb/interpreter.py
+++ b/neb/interpreter.py
@@ -846,3 +846,10 @@ def interpretIsBool(symbol, args, env, ns):
     return Bool(isinstance(args[0], Bool))
 
 GLOBALS.register("bool?", Builtin(interpretIsBool, [Arg("arg", TypeEnum.ANY)]))
+
+def interpretUserSymbols(symbol, args, env, ns):
+    keys = [k for k,v in env.environment.items() if isinstance(v, UserFunction) or isinstance(v, Literal)]
+    keys.sort()
+    return List(keys, True)
+
+GLOBALS.register("user-symbols", Builtin(interpretUserSymbols, []))
-- 
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