From 109cddae12387e87f8d118b363874585dcedfe4f Mon Sep 17 00:00:00 2001
From: Simon Forman <sforman@hushmail.com>
Date: Mon, 17 Oct 2022 17:51:12 -0700
Subject: [PATCH] Readline support would be nice.

---
 implementations/Python/rdln.py | 35 ++++++++++++++++++++++++++++++++++
 1 file changed, 35 insertions(+)
 create mode 100644 implementations/Python/rdln.py

diff --git a/implementations/Python/rdln.py b/implementations/Python/rdln.py
new file mode 100644
index 0000000..08ca3a2
--- /dev/null
+++ b/implementations/Python/rdln.py
@@ -0,0 +1,35 @@
+from pathlib import Path
+import atexit
+import os
+import readline
+
+NAMES = set(dir(__builtins__))
+
+# Note that we WANT names here to be part of the closure of the
+# function so it retains its value from call to call.
+def completer(text, state, names=[]):
+    if 0 == state:
+        names[:] = filter(lambda name: name.startswith(text), NAMES)
+    try:
+        return names[state]
+    except IndexError:
+        return
+
+
+readline.set_completer(completer)
+readline.parse_and_bind('TAB: complete')
+
+hfname = str(Path.home() / '.joy_history')
+try:
+    readline.read_history_file(hfname)
+except FileNotFoundError:
+    pass
+atexit.register(readline.write_history_file, hfname)
+
+while True:
+    try:
+        i = input('> ')
+    except (EOFError, KeyboardInterrupt):
+        i = ''
+        break
+    print(i)